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[wine/multimedia.git] / tools / widl / write_msft.c

/*
 *      Typelib v2 (MSFT) generation
 *
 *      Copyright 2004  Alastair Bridgewater
 *                2004, 2005 Huw Davies
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * --------------------------------------------------------------------------------------
 *  Known problems:
 *
 *    Badly incomplete.
 *
 *    Only works on little-endian systems.
 *
 */

#include "config.h"
#include "wine/port.h"

#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <ctype.h>
#include <time.h>

#define NONAMELESSUNION
#define NONAMELESSSTRUCT

#include "winerror.h"
#include "windef.h"
#include "winbase.h"
#include "winnls.h"

#include "widltypes.h"
#include "typelib.h"
#include "typelib_struct.h"
#include "utils.h"
#include "header.h"
#include "hash.h"

enum MSFT_segment_index {
    MSFT_SEG_TYPEINFO = 0,  /* type information */
    MSFT_SEG_IMPORTINFO,    /* import information */
    MSFT_SEG_IMPORTFILES,   /* import filenames */
    MSFT_SEG_REFERENCES,    /* references (?) */
    MSFT_SEG_GUIDHASH,      /* hash table for guids? */
    MSFT_SEG_GUID,          /* guid storage */
    MSFT_SEG_NAMEHASH,      /* hash table for names */
    MSFT_SEG_NAME,          /* name storage */
    MSFT_SEG_STRING,        /* string storage */
    MSFT_SEG_TYPEDESC,      /* type descriptions */
    MSFT_SEG_ARRAYDESC,     /* array descriptions */
    MSFT_SEG_CUSTDATA,      /* custom data */
    MSFT_SEG_CUSTDATAGUID,  /* custom data guids */
    MSFT_SEG_UNKNOWN,       /* ??? */
    MSFT_SEG_UNKNOWN2,      /* ??? */
    MSFT_SEG_MAX            /* total number of segments */
};

typedef struct tagMSFT_ImpFile {
    int guid;
    LCID lcid;
    int version;
    char filename[0]; /* preceded by two bytes of encoded (length << 2) + flags in the low two bits. */
} MSFT_ImpFile;

typedef struct _msft_typelib_t
{
    typelib_t *typelib;
    MSFT_Header typelib_header;
    MSFT_pSeg typelib_segdir[MSFT_SEG_MAX];
    char *typelib_segment_data[MSFT_SEG_MAX];
    int typelib_segment_block_length[MSFT_SEG_MAX];

    INT typelib_typeinfo_offsets[0x200]; /* Hope that's enough. */

    INT *typelib_namehash_segment;
    INT *typelib_guidhash_segment;

    INT help_string_dll_offset;

    struct _msft_typeinfo_t *typeinfos;
    struct _msft_typeinfo_t *last_typeinfo;
} msft_typelib_t;

typedef struct _msft_typeinfo_t
{
    msft_typelib_t *typelib;
    MSFT_TypeInfoBase *typeinfo;

    int typekind;

    unsigned int var_data_allocated;
    int *var_data;

    unsigned int func_data_allocated;
    int *func_data;

    int vars_allocated;
    int *var_indices;
    int *var_names;
    int *var_offsets;

    int funcs_allocated;
    int *func_indices;
    int *func_names;
    int *func_offsets;

    int datawidth;

    struct _msft_typeinfo_t *next_typeinfo;
} msft_typeinfo_t;



/*================== Internal functions ===================================*/

/****************************************************************************
 *      ctl2_init_header
 *
 *  Initializes the type library header of a new typelib.
 */
static void ctl2_init_header(
        msft_typelib_t *typelib) /* [I] The typelib to initialize. */
{
    typelib->typelib_header.magic1 = 0x5446534d;
    typelib->typelib_header.magic2 = 0x00010002;
    typelib->typelib_header.posguid = -1;
    typelib->typelib_header.lcid = 0x0409; /* or do we use the current one? */
    typelib->typelib_header.lcid2 = 0x0;
    typelib->typelib_header.varflags = 0x40;
    typelib->typelib_header.version = 0;
    typelib->typelib_header.flags = 0;
    typelib->typelib_header.nrtypeinfos = 0;
    typelib->typelib_header.helpstring = -1;
    typelib->typelib_header.helpstringcontext = 0;
    typelib->typelib_header.helpcontext = 0;
    typelib->typelib_header.nametablecount = 0;
    typelib->typelib_header.nametablechars = 0;
    typelib->typelib_header.NameOffset = -1;
    typelib->typelib_header.helpfile = -1;
    typelib->typelib_header.CustomDataOffset = -1;
    typelib->typelib_header.res44 = 0x20;
    typelib->typelib_header.res48 = 0x80;
    typelib->typelib_header.dispatchpos = -1;
    typelib->typelib_header.nimpinfos = 0;
}

/****************************************************************************
 *      ctl2_init_segdir
 *
 *  Initializes the segment directory of a new typelib.
 */
static void ctl2_init_segdir(
        msft_typelib_t *typelib) /* [I] The typelib to initialize. */
{
    int i;
    MSFT_pSeg *segdir;

    segdir = &typelib->typelib_segdir[MSFT_SEG_TYPEINFO];

    for (i = 0; i < 15; i++) {
        segdir[i].offset = -1;
        segdir[i].length = 0;
        segdir[i].res08 = -1;
        segdir[i].res0c = 0x0f;
    }
}

/****************************************************************************
 *      ctl2_hash_guid
 *
 *  Generates a hash key from a GUID.
 *
 * RETURNS
 *
 *  The hash key for the GUID.
 */
static int ctl2_hash_guid(
        REFGUID guid)                /* [I] The guid to hash. */
{
    int hash;
    int i;

    hash = 0;
    for (i = 0; i < 8; i ++) {
        hash ^= ((const short *)guid)[i];
    }

    return hash & 0x1f;
}

/****************************************************************************
 *      ctl2_find_guid
 *
 *  Locates a guid in a type library.
 *
 * RETURNS
 *
 *  The offset into the GUID segment of the guid, or -1 if not found.
 */
static int ctl2_find_guid(
        msft_typelib_t *typelib,   /* [I] The typelib to operate against. */
        int hash_key,              /* [I] The hash key for the guid. */
        REFGUID guid)              /* [I] The guid to find. */
{
    int offset;
    MSFT_GuidEntry *guidentry;

    offset = typelib->typelib_guidhash_segment[hash_key];
    while (offset != -1) {
        guidentry = (MSFT_GuidEntry *)&typelib->typelib_segment_data[MSFT_SEG_GUID][offset];

        if (!memcmp(guidentry, guid, sizeof(GUID))) return offset;

        offset = guidentry->next_hash;
    }

    return offset;
}

/****************************************************************************
 *      ctl2_find_name
 *
 *  Locates a name in a type library.
 *
 * RETURNS
 *
 *  The offset into the NAME segment of the name, or -1 if not found.
 *
 * NOTES
 *
 *  The name must be encoded as with ctl2_encode_name().
 */
static int ctl2_find_name(
        msft_typelib_t *typelib,   /* [I] The typelib to operate against. */
        char *name)                /* [I] The encoded name to find. */
{
    int offset;
    int *namestruct;

    offset = typelib->typelib_namehash_segment[name[2] & 0x7f];
    while (offset != -1) {
        namestruct = (int *)&typelib->typelib_segment_data[MSFT_SEG_NAME][offset];

        if (!((namestruct[2] ^ *((int *)name)) & 0xffff00ff)) {
            /* hash codes and lengths match, final test */
            if (!strncasecmp(name+4, (void *)(namestruct+3), name[0])) break;
        }

        /* move to next item in hash bucket */
        offset = namestruct[1];
    }

    return offset;
}

/****************************************************************************
 *      ctl2_encode_name
 *
 *  Encodes a name string to a form suitable for storing into a type library
 *  or comparing to a name stored in a type library.
 *
 * RETURNS
 *
 *  The length of the encoded name, including padding and length+hash fields.
 *
 * NOTES
 *
 *  Will throw an exception if name or result are NULL. Is not multithread
 *  safe in the slightest.
 */
static int ctl2_encode_name(
        msft_typelib_t *typelib,   /* [I] The typelib to operate against (used for LCID only). */
        const char *name,          /* [I] The name string to encode. */
        char **result)             /* [O] A pointer to a pointer to receive the encoded name. */
{
    int length;
    static char converted_name[0x104];
    int offset;
    int value;

    length = strlen(name);
    memcpy(converted_name + 4, name, length);
    converted_name[0] = length & 0xff;

    converted_name[length + 4] = 0;

    converted_name[1] = 0x00;

    value = lhash_val_of_name_sys(typelib->typelib_header.varflags & 0x0f, typelib->typelib_header.lcid, converted_name + 4);

    converted_name[2] = value;
    converted_name[3] = value >> 8;

    for (offset = (4 - length) & 3; offset; offset--) converted_name[length + offset + 3] = 0x57;

    *result = converted_name;

    return (length + 7) & ~3;
}

/****************************************************************************
 *      ctl2_encode_string
 *
 *  Encodes a string to a form suitable for storing into a type library or
 *  comparing to a string stored in a type library.
 *
 * RETURNS
 *
 *  The length of the encoded string, including padding and length fields.
 *
 * NOTES
 *
 *  Will throw an exception if string or result are NULL. Is not multithread
 *  safe in the slightest.
 */
static int ctl2_encode_string(
        const char *string,        /* [I] The string to encode. */
        char **result)             /* [O] A pointer to a pointer to receive the encoded string. */
{
    int length;
    static char converted_string[0x104];
    int offset;

    length = strlen(string);
    memcpy(converted_string + 2, string, length);
    converted_string[0] = length & 0xff;
    converted_string[1] = (length >> 8) & 0xff;

    if(length < 3) { /* strings of this length are padded with up to 8 bytes incl the 2 byte length */
        for(offset = 0; offset < 4; offset++)
            converted_string[length + offset + 2] = 0x57;
        length += 4;
    }
    for (offset = (4 - (length + 2)) & 3; offset; offset--) converted_string[length + offset + 1] = 0x57;

    *result = converted_string;

    return (length + 5) & ~3;
}

/****************************************************************************
 *      ctl2_alloc_segment
 *
 *  Allocates memory from a segment in a type library.
 *
 * RETURNS
 *
 *  Success: The offset within the segment of the new data area.
 *
 * BUGS
 *
 *  Does not (yet) handle the case where the allocated segment memory needs to grow.
 */
static int ctl2_alloc_segment(
        msft_typelib_t *typelib,         /* [I] The type library in which to allocate. */
        enum MSFT_segment_index segment, /* [I] The segment in which to allocate. */
        int size,                        /* [I] The amount to allocate. */
        int block_size)                  /* [I] Initial allocation block size, or 0 for default. */
{
    int offset;

    if(!typelib->typelib_segment_data[segment]) {
        if (!block_size) block_size = 0x2000;

        typelib->typelib_segment_block_length[segment] = block_size;
        typelib->typelib_segment_data[segment] = xmalloc(block_size);
        if (!typelib->typelib_segment_data[segment]) return -1;
        memset(typelib->typelib_segment_data[segment], 0x57, block_size);
    }

    while ((typelib->typelib_segdir[segment].length + size) > typelib->typelib_segment_block_length[segment]) {
        char *block;

        block_size = typelib->typelib_segment_block_length[segment];
        block = xrealloc(typelib->typelib_segment_data[segment], block_size << 1);

        if (segment == MSFT_SEG_TYPEINFO) {
            /* TypeInfos have a direct pointer to their memory space, so we have to fix them up. */
            msft_typeinfo_t *typeinfo;

            for (typeinfo = typelib->typeinfos; typeinfo; typeinfo = typeinfo->next_typeinfo) {
                typeinfo->typeinfo = (void *)&block[((char *)typeinfo->typeinfo) - typelib->typelib_segment_data[segment]];
            }
        }

        memset(block + block_size, 0x57, block_size);
        typelib->typelib_segment_block_length[segment] = block_size << 1;
        typelib->typelib_segment_data[segment] = block;
    }

    offset = typelib->typelib_segdir[segment].length;
    typelib->typelib_segdir[segment].length += size;

    return offset;
}

/****************************************************************************
 *      ctl2_alloc_typeinfo
 *
 *  Allocates and initializes a typeinfo structure in a type library.
 *
 * RETURNS
 *
 *  Success: The offset of the new typeinfo.
 *  Failure: -1 (this is invariably an out of memory condition).
 */
static int ctl2_alloc_typeinfo(
        msft_typelib_t *typelib,   /* [I] The type library to allocate in. */
        int nameoffset)            /* [I] The offset of the name for this typeinfo. */
{
    int offset;
    MSFT_TypeInfoBase *typeinfo;

    offset = ctl2_alloc_segment(typelib, MSFT_SEG_TYPEINFO, sizeof(MSFT_TypeInfoBase), 0);

    typelib->typelib_typeinfo_offsets[typelib->typelib_header.nrtypeinfos++] = offset;

    typeinfo = (void *)(typelib->typelib_segment_data[MSFT_SEG_TYPEINFO] + offset);

    typeinfo->typekind = (typelib->typelib_header.nrtypeinfos - 1) << 16;
    typeinfo->memoffset = -1; /* should be EOF if no elements */
    typeinfo->res2 = 0;
    typeinfo->res3 = -1;
    typeinfo->res4 = 3;
    typeinfo->res5 = 0;
    typeinfo->cElement = 0;
    typeinfo->res7 = 0;
    typeinfo->res8 = 0;
    typeinfo->res9 = 0;
    typeinfo->resA = 0;
    typeinfo->posguid = -1;
    typeinfo->flags = 0;
    typeinfo->NameOffset = nameoffset;
    typeinfo->version = 0;
    typeinfo->docstringoffs = -1;
    typeinfo->helpstringcontext = 0;
    typeinfo->helpcontext = 0;
    typeinfo->oCustData = -1;
    typeinfo->cbSizeVft = 0;
    typeinfo->cImplTypes = 0;
    typeinfo->size = 0;
    typeinfo->datatype1 = -1;
    typeinfo->datatype2 = 0;
    typeinfo->res18 = 0;
    typeinfo->res19 = -1;

    return offset;
}

/****************************************************************************
 *      ctl2_alloc_guid
 *
 *  Allocates and initializes a GUID structure in a type library. Also updates
 *  the GUID hash table as needed.
 *
 * RETURNS
 *
 *  Success: The offset of the new GUID.
 */
static int ctl2_alloc_guid(
        msft_typelib_t *typelib,   /* [I] The type library to allocate in. */
        MSFT_GuidEntry *guid)      /* [I] The GUID to store. */
{
    int offset;
    MSFT_GuidEntry *guid_space;
    int hash_key;

    hash_key = ctl2_hash_guid(&guid->guid);

    offset = ctl2_find_guid(typelib, hash_key, &guid->guid);
    if (offset != -1) return offset;

    offset = ctl2_alloc_segment(typelib, MSFT_SEG_GUID, sizeof(MSFT_GuidEntry), 0);

    guid_space = (void *)(typelib->typelib_segment_data[MSFT_SEG_GUID] + offset);
    *guid_space = *guid;

    guid_space->next_hash = typelib->typelib_guidhash_segment[hash_key];
    typelib->typelib_guidhash_segment[hash_key] = offset;

    return offset;
}

/****************************************************************************
 *      ctl2_alloc_name
 *
 *  Allocates and initializes a name within a type library. Also updates the
 *  name hash table as needed.
 *
 * RETURNS
 *
 *  Success: The offset within the segment of the new name.
 *  Failure: -1 (this is invariably an out of memory condition).
 */
static int ctl2_alloc_name(
        msft_typelib_t *typelib,  /* [I] The type library to allocate in. */
        const char *name)         /* [I] The name to store. */
{
    int length;
    int offset;
    MSFT_NameIntro *name_space;
    char *encoded_name;

    length = ctl2_encode_name(typelib, name, &encoded_name);

    offset = ctl2_find_name(typelib, encoded_name);
    if (offset != -1) return offset;

    offset = ctl2_alloc_segment(typelib, MSFT_SEG_NAME, length + 8, 0);

    name_space = (void *)(typelib->typelib_segment_data[MSFT_SEG_NAME] + offset);
    name_space->hreftype = -1;
    name_space->next_hash = -1;
    memcpy(&name_space->namelen, encoded_name, length);

    if (typelib->typelib_namehash_segment[encoded_name[2] & 0x7f] != -1)
        name_space->next_hash = typelib->typelib_namehash_segment[encoded_name[2] & 0x7f];

    typelib->typelib_namehash_segment[encoded_name[2] & 0x7f] = offset;

    typelib->typelib_header.nametablecount += 1;
    typelib->typelib_header.nametablechars += *encoded_name;

    return offset;
}

/****************************************************************************
 *      ctl2_alloc_string
 *
 *  Allocates and initializes a string in a type library.
 *
 * RETURNS
 *
 *  Success: The offset within the segment of the new string.
 *  Failure: -1 (this is invariably an out of memory condition).
 */
static int ctl2_alloc_string(
        msft_typelib_t *typelib,  /* [I] The type library to allocate in. */
        const char *string)       /* [I] The string to store. */
{
    int length;
    int offset;
    char *string_space;
    char *encoded_string;

    length = ctl2_encode_string(string, &encoded_string);

    for (offset = 0; offset < typelib->typelib_segdir[MSFT_SEG_STRING].length;
         offset += ((((typelib->typelib_segment_data[MSFT_SEG_STRING][offset + 1] << 8) & 0xff)
             | (typelib->typelib_segment_data[MSFT_SEG_STRING][offset + 0] & 0xff)) + 5) & ~3) {
        if (!memcmp(encoded_string, typelib->typelib_segment_data[MSFT_SEG_STRING] + offset, length)) return offset;
    }

    offset = ctl2_alloc_segment(typelib, MSFT_SEG_STRING, length, 0);

    string_space = typelib->typelib_segment_data[MSFT_SEG_STRING] + offset;
    memcpy(string_space, encoded_string, length);

    return offset;
}

/****************************************************************************
 *      alloc_msft_importinfo
 *
 *  Allocates and initializes an import information structure in a type library.
 *
 * RETURNS
 *
 *  Success: The offset of the new importinfo.
 *  Failure: -1 (this is invariably an out of memory condition).
 */
static int alloc_msft_importinfo(
        msft_typelib_t *typelib,   /* [I] The type library to allocate in. */
        MSFT_ImpInfo *impinfo)     /* [I] The import information to store. */
{
    int offset;
    MSFT_ImpInfo *impinfo_space;

    for (offset = 0;
         offset < typelib->typelib_segdir[MSFT_SEG_IMPORTINFO].length;
         offset += sizeof(MSFT_ImpInfo)) {
        if (!memcmp(&(typelib->typelib_segment_data[MSFT_SEG_IMPORTINFO][offset]),
                    impinfo, sizeof(MSFT_ImpInfo))) {
            return offset;
        }
    }

    impinfo->flags |= typelib->typelib_header.nimpinfos++;

    offset = ctl2_alloc_segment(typelib, MSFT_SEG_IMPORTINFO, sizeof(MSFT_ImpInfo), 0);

    impinfo_space = (void *)(typelib->typelib_segment_data[MSFT_SEG_IMPORTINFO] + offset);
    *impinfo_space = *impinfo;

    return offset;
}

/****************************************************************************
 *      alloc_importfile
 *
 *  Allocates and initializes an import file definition in a type library.
 *
 * RETURNS
 *
 *  Success: The offset of the new importinfo.
 *  Failure: -1 (this is invariably an out of memory condition).
 */
static int alloc_importfile(
        msft_typelib_t *typelib,   /* [I] The type library to allocate in. */
        int guidoffset,            /* [I] The offset to the GUID for the imported library. */
        int major_version,         /* [I] The major version number of the imported library. */
        int minor_version,         /* [I] The minor version number of the imported library. */
        const char *filename)      /* [I] The filename of the imported library. */
{
    int length;
    int offset;
    MSFT_ImpFile *importfile;
    char *encoded_string;

    length = ctl2_encode_string(filename, &encoded_string);

    encoded_string[0] <<= 2;
    encoded_string[0] |= 1;

    for (offset = 0; offset < typelib->typelib_segdir[MSFT_SEG_IMPORTFILES].length;
         offset += ((((typelib->typelib_segment_data[MSFT_SEG_IMPORTFILES][offset + 0xd] << 8) & 0xff)
             | (typelib->typelib_segment_data[MSFT_SEG_IMPORTFILES][offset + 0xc] & 0xff)) >> 2) + 0xc) {
        if (!memcmp(encoded_string, typelib->typelib_segment_data[MSFT_SEG_IMPORTFILES] + offset + 0xc, length)) return offset;
    }

    offset = ctl2_alloc_segment(typelib, MSFT_SEG_IMPORTFILES, length + 0xc, 0);

    importfile = (MSFT_ImpFile *)&typelib->typelib_segment_data[MSFT_SEG_IMPORTFILES][offset];
    importfile->guid = guidoffset;
    importfile->lcid = typelib->typelib_header.lcid2;
    importfile->version = major_version | (minor_version << 16);
    memcpy(&importfile->filename, encoded_string, length);

    return offset;
}

static void alloc_importinfo(msft_typelib_t *typelib, importinfo_t *importinfo)
{
    importlib_t *importlib = importinfo->importlib;

    chat("alloc_importinfo: %s\n", importinfo->name);

    if(!importlib->allocated) {
        MSFT_GuidEntry guid;
        int guid_idx;

        chat("allocating importlib %s\n", importlib->name);

        importlib->allocated = -1;

        memcpy(&guid.guid, &importlib->guid, sizeof(GUID));
        guid.hreftype = 2;

        guid_idx = ctl2_alloc_guid(typelib, &guid);

        alloc_importfile(typelib, guid_idx, importlib->version&0xffff,
                         importlib->version>>16, importlib->name);
    }

    if(importinfo->offset == -1 || !(importinfo->flags & MSFT_IMPINFO_OFFSET_IS_GUID)) {
        MSFT_ImpInfo impinfo;

        impinfo.flags = importinfo->flags;
        impinfo.oImpFile = 0;

        if(importinfo->flags & MSFT_IMPINFO_OFFSET_IS_GUID) {
            MSFT_GuidEntry guid;

            guid.hreftype = 0;
            memcpy(&guid.guid, &importinfo->guid, sizeof(GUID));

            impinfo.oGuid = ctl2_alloc_guid(typelib, &guid);

            importinfo->offset = alloc_msft_importinfo(typelib, &impinfo);

            typelib->typelib_segment_data[MSFT_SEG_GUID][impinfo.oGuid+sizeof(GUID)]
                = importinfo->offset+1;

            if(!strcmp(importinfo->name, "IDispatch"))
                typelib->typelib_header.dispatchpos = importinfo->offset+1;
        }else {
            impinfo.oGuid = importinfo->id;
            importinfo->offset = alloc_msft_importinfo(typelib, &impinfo);
        }
    }
}

static importinfo_t *find_importinfo(msft_typelib_t *typelib, const char *name)
{
    importlib_t *importlib;
    int i;

    chat("search importlib %s\n", name);

    if(!name)
        return NULL;

    LIST_FOR_EACH_ENTRY( importlib, &typelib->typelib->importlibs, importlib_t, entry )
    {
        for(i=0; i < importlib->ntypeinfos; i++) {
            if(!strcmp(name, importlib->importinfos[i].name)) {
                chat("Found %s in importlib.\n", name);
                return importlib->importinfos+i;
            }
        }
    }

    return NULL;
}

static void add_structure_typeinfo(msft_typelib_t *typelib, type_t *structure);
static void add_interface_typeinfo(msft_typelib_t *typelib, type_t *interface);
static void add_enum_typeinfo(msft_typelib_t *typelib, type_t *enumeration);
static void add_coclass_typeinfo(msft_typelib_t *typelib, type_t *cls);


/****************************************************************************
 *      encode_type
 *
 *  Encodes a type, storing information in the TYPEDESC and ARRAYDESC
 *  segments as needed.
 *
 * RETURNS
 *
 *  Success: 0.
 *  Failure: -1.
 */
static int encode_type(
        msft_typelib_t *typelib,   /* [I] The type library in which to encode the TYPEDESC. */
        int vt,                    /* [I] vt to encode */
        type_t *type,              /* [I] type */
        int *encoded_type,         /* [O] The encoded type description. */
        int *width,                /* [O] The width of the type, or NULL. */
        int *alignment,            /* [O] The alignment of the type, or NULL. */
        int *decoded_size)         /* [O] The total size of the unencoded TYPEDESCs, including nested descs. */
{
    int default_type;
    int scratch;
    int typeoffset;
    int *typedata;
    int target_type;
    int child_size = 0;

    chat("encode_type vt %d type %p\n", vt, type);

    default_type = 0x80000000 | (vt << 16) | vt;
    if (!width) width = &scratch;
    if (!alignment) alignment = &scratch;
    if (!decoded_size) decoded_size = &scratch;


    switch (vt) {
    case VT_I1:
    case VT_UI1:
        *encoded_type = default_type;
        *width = 1;
        *alignment = 1;
        break;

    case VT_INT:
        *encoded_type = 0x80000000 | (VT_I4 << 16) | VT_INT;
        if ((typelib->typelib_header.varflags & 0x0f) == SYS_WIN16) {
            *width = 2;
            *alignment = 2;
        } else {
            *width = 4;
            *alignment = 4;
        }
        break;

    case VT_UINT:
        *encoded_type = 0x80000000 | (VT_UI4 << 16) | VT_UINT;
        if ((typelib->typelib_header.varflags & 0x0f) == SYS_WIN16) {
            *width = 2;
            *alignment = 2;
        } else {
            *width = 4;
            *alignment = 4;
        }
        break;

    case VT_UI2:
    case VT_I2:
    case VT_BOOL:
        *encoded_type = default_type;
        *width = 2;
        *alignment = 2;
        break;

    case VT_I4:
    case VT_UI4:
    case VT_R4:
    case VT_ERROR:
    case VT_BSTR:
    case VT_HRESULT:
        *encoded_type = default_type;
        *width = 4;
        *alignment = 4;
        break;

    case VT_R8:
    case VT_I8:
    case VT_UI8:
        *encoded_type = default_type;
        *width = 8;
        *alignment = 8;
        break;

    case VT_CY:
        *encoded_type = default_type;
        *width = 8;
        *alignment = 8;
        break;

    case VT_VOID:
        *encoded_type = 0x80000000 | (VT_EMPTY << 16) | vt;
        *width = 0;
        *alignment = 1;
        break;

    case VT_UNKNOWN:
    case VT_DISPATCH:
        *encoded_type = default_type;
        *width = 4;
        *alignment = 4;
        break;

    case VT_VARIANT:
        *encoded_type = default_type;
        break;

    case VT_PTR:
      {
        int next_vt;
        for(next_vt = 0; type->ref; type = type->ref) {
            next_vt = get_type_vt(type->ref);
            if (next_vt != 0)
                break;
        }
        /* if no type found then it must be void */
        if (next_vt == 0)
            next_vt = VT_VOID;

        encode_type(typelib, next_vt, type->ref, &target_type, NULL, NULL, &child_size);
        if(type->ref && (type->ref->type == RPC_FC_IP)) {
            chat("encode_type: skipping ptr\n");
            *encoded_type = target_type;
            *width = 4;
            *alignment = 4;
            *decoded_size = child_size;
            break;
        }

        for (typeoffset = 0; typeoffset < typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length; typeoffset += 8) {
            typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];
            if (((typedata[0] & 0xffff) == VT_PTR) && (typedata[1] == target_type)) break;
        }

        if (typeoffset == typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length) {
            int mix_field;
            
            if (target_type & 0x80000000) {
                mix_field = ((target_type >> 16) & 0x3fff) | VT_BYREF;
            } else {
                typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][target_type];
                mix_field = ((typedata[0] >> 16) == 0x7fff)? 0x7fff: 0x7ffe;
            }

            typeoffset = ctl2_alloc_segment(typelib, MSFT_SEG_TYPEDESC, 8, 0);
            typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];

            typedata[0] = (mix_field << 16) | VT_PTR;
            typedata[1] = target_type;
        }

        *encoded_type = typeoffset;

        *width = 4;
        *alignment = 4;
        *decoded_size = 8 /*sizeof(TYPEDESC)*/ + child_size;
        break;
    }
#if 0


    case VT_SAFEARRAY:
        /* FIXME: Make with the error checking. */
        FIXME("SAFEARRAY vartype, may not work correctly.\n");

        ctl2_encode_typedesc(typelib, tdesc->u.lptdesc, &target_type, NULL, NULL, &child_size);

        for (typeoffset = 0; typeoffset < typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length; typeoffset += 8) {
            typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];
            if (((typedata[0] & 0xffff) == VT_SAFEARRAY) && (typedata[1] == target_type)) break;
        }

        if (typeoffset == typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length) {
            int mix_field;
            
            if (target_type & 0x80000000) {
                mix_field = ((target_type >> 16) & VT_TYPEMASK) | VT_ARRAY;
            } else {
                typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][target_type];
                mix_field = ((typedata[0] >> 16) == 0x7fff)? 0x7fff: 0x7ffe;
            }

            typeoffset = ctl2_alloc_segment(typelib, MSFT_SEG_TYPEDESC, 8, 0);
            typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];

            typedata[0] = (mix_field << 16) | VT_SAFEARRAY;
            typedata[1] = target_type;
        }

        *encoded_tdesc = typeoffset;

        *width = 4;
        *alignment = 4;
        *decoded_size = sizeof(TYPEDESC) + child_size;
        break;


#endif

    case VT_USERDEFINED:
      {
        int typeinfo_offset;

        /* typedef'd types without attributes aren't included in the typelib */
        while (type->typelib_idx < 0 && type->kind == TKIND_ALIAS && ! type->attrs)
          type = type->orig;

        chat("encode_type: VT_USERDEFINED - type %p name = %s type->type %d idx %d\n", type,
             type->name, type->type, type->typelib_idx);

        if(type->typelib_idx == -1) {
            chat("encode_type: trying to ref not added type\n");
            switch(type->type) {
            case RPC_FC_STRUCT:
            case RPC_FC_PSTRUCT:
            case RPC_FC_CSTRUCT:
            case RPC_FC_CPSTRUCT:
            case RPC_FC_CVSTRUCT:
            case RPC_FC_BOGUS_STRUCT:
                add_structure_typeinfo(typelib, type);
                break;
            case RPC_FC_IP:
                add_interface_typeinfo(typelib, type);
                break;
            case RPC_FC_ENUM16:
                add_enum_typeinfo(typelib, type);
                break;
            case 0:
                if (type->kind == TKIND_COCLASS)
                    add_coclass_typeinfo(typelib, type);
                else
                    error("encode_type: VT_USERDEFINED - can't yet add typedef's on the fly\n");
                break;
            default:
                error("encode_type: VT_USERDEFINED - unhandled type %d\n", type->type);
            }
        }

        typeinfo_offset = typelib->typelib_typeinfo_offsets[type->typelib_idx];
        for (typeoffset = 0; typeoffset < typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length; typeoffset += 8) {
            typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];
            if ((typedata[0] == ((0x7fff << 16) | VT_USERDEFINED)) && (typedata[1] == typeinfo_offset)) break;
        }

        if (typeoffset == typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length) {
            typeoffset = ctl2_alloc_segment(typelib, MSFT_SEG_TYPEDESC, 8, 0);
            typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];

            typedata[0] = (0x7fff << 16) | VT_USERDEFINED;
            typedata[1] = typeinfo_offset;
        }

        *encoded_type = typeoffset;
        *width = 0;
        *alignment = 1;

        if(type->type == RPC_FC_IP) {
            for (typeoffset = 0; typeoffset < typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length; typeoffset += 8) {
                typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];
                if ((typedata[0] == ((0x7fff << 16) | VT_PTR)) && (typedata[1] == *encoded_type)) break;
            }
            if (typeoffset == typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length) {
                typeoffset = ctl2_alloc_segment(typelib, MSFT_SEG_TYPEDESC, 8, 0);
                typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];

                typedata[0] = (0x7fff << 16) | VT_PTR;
                typedata[1] = *encoded_type;
            }
            *encoded_type = typeoffset;
            *width = 4;
            *alignment = 4;
            *decoded_size += 8;
        }
        break;
      }

    default:
        error("encode_type: unrecognized type %d.\n", vt);
        *encoded_type = default_type;
        *width = 0;
        *alignment = 1;
        break;
    }

    return 0;
}

static void dump_type(type_t *t)
{
    chat("dump_type: %p name %s type %d ref %p attrs %p\n", t, t->name, t->type, t->ref, t->attrs);
    if(t->ref) dump_type(t->ref);
}

static int encode_var(
        msft_typelib_t *typelib,   /* [I] The type library in which to encode the TYPEDESC. */
        var_t *var,                /* [I] The type description to encode. */
        int *encoded_type,         /* [O] The encoded type description. */
        int *width,                /* [O] The width of the type, or NULL. */
        int *alignment,            /* [O] The alignment of the type, or NULL. */
        int *decoded_size)         /* [O] The total size of the unencoded TYPEDESCs, including nested descs. */
{
    int typeoffset;
    int *typedata;
    int target_type;
    int child_size;
    int vt;
    int scratch;
    type_t *type;

    if (!width) width = &scratch;
    if (!alignment) alignment = &scratch;
    if (!decoded_size) decoded_size = &scratch;
    *decoded_size = 0;

    chat("encode_var: var %p var->tname %s var->type %p var->ptr_level %d var->type->ref %p\n", var, var->tname, var->type, var->ptr_level, var->type->ref);
    if(var->ptr_level) {
        int skip_ptr;
        var->ptr_level--;
        skip_ptr = encode_var(typelib, var, &target_type, NULL, NULL, &child_size);
        var->ptr_level++;

        if(skip_ptr == 2) {
            chat("encode_var: skipping ptr\n");
            *encoded_type = target_type;
            *decoded_size = child_size;
            *width = 4;
            *alignment = 4;
            return 0;
        }

        for (typeoffset = 0; typeoffset < typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length; typeoffset += 8) {
            typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];
            if (((typedata[0] & 0xffff) == VT_PTR) && (typedata[1] == target_type)) break;
        }

        if (typeoffset == typelib->typelib_segdir[MSFT_SEG_TYPEDESC].length) {
            int mix_field;
            
            if (target_type & 0x80000000) {
                mix_field = ((target_type >> 16) & 0x3fff) | VT_BYREF;
            } else {
                typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][target_type];
                mix_field = ((typedata[0] >> 16) == 0x7fff)? 0x7fff: 0x7ffe;
            }

            typeoffset = ctl2_alloc_segment(typelib, MSFT_SEG_TYPEDESC, 8, 0);
            typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];

            typedata[0] = (mix_field << 16) | VT_PTR;
            typedata[1] = target_type;
        }

        *encoded_type = typeoffset;

        *width = 4;
        *alignment = 4;
        *decoded_size = 8 /*sizeof(TYPEDESC)*/ + child_size;
        return 0;
    }

    if(var->array) {
        expr_t *dim;
        array_dims_t *array_save;
        int num_dims = list_count( var->array ), elements = 1, arrayoffset;
        int *arraydata;

        chat("array with %d dimensions\n", num_dims);
        array_save = var->array;
        var->array = NULL;
        encode_var(typelib, var, &target_type, width, alignment, NULL);
        var->array = array_save;
        arrayoffset = ctl2_alloc_segment(typelib, MSFT_SEG_ARRAYDESC, (2 + 2 * num_dims) * sizeof(long), 0);
        arraydata = (void *)&typelib->typelib_segment_data[MSFT_SEG_ARRAYDESC][arrayoffset];

        arraydata[0] = target_type;
        arraydata[1] = num_dims;
        arraydata[1] |= ((num_dims * 2 * sizeof(long)) << 16);

        arraydata += 2;
        LIST_FOR_EACH_ENTRY( dim, var->array, expr_t, entry )
        {
            arraydata[0] = dim->cval;
            arraydata[1] = 0;
            arraydata += 2;
            elements *= dim->cval;
        }

        typeoffset = ctl2_alloc_segment(typelib, MSFT_SEG_TYPEDESC, 8, 0);
        typedata = (void *)&typelib->typelib_segment_data[MSFT_SEG_TYPEDESC][typeoffset];

        typedata[0] = (0x7ffe << 16) | VT_CARRAY;
        typedata[1] = arrayoffset;

        *encoded_type = typeoffset;
        *width = *width * elements;
        *decoded_size = 20 /*sizeof(ARRAYDESC)*/ + (num_dims - 1) * 8 /*sizeof(SAFEARRAYBOUND)*/;
        return 0;
    }
    dump_type(var->type);

    vt = get_var_vt(var);
    type = var->type;
    while(!vt) {
        if(type->ref == NULL) {
            vt = VT_VOID;
            break;
        }
        type = type->ref;
        vt = get_type_vt(type);
    }
    encode_type(typelib, vt, type, encoded_type, width, alignment, decoded_size);
    if(type->type == RPC_FC_IP) return 2;
    return 0;
}


static void write_value(msft_typelib_t* typelib, int *out, int vt, void *value)
{
    switch(vt) {
    case VT_I2:
    case VT_I4:
    case VT_R4:
    case VT_BOOL:
    case VT_I1:
    case VT_UI1:
    case VT_UI2:
    case VT_UI4:
    case VT_INT:
    case VT_UINT:
    case VT_HRESULT:
      {
        unsigned long *lv = value;
        if((*lv & 0x3ffffff) == *lv) {
            *out = 0x80000000;
            *out |= vt << 26;
            *out |= *lv;
        } else {
            int offset = ctl2_alloc_segment(typelib, MSFT_SEG_CUSTDATA, 8, 0);
            *((unsigned short *)&typelib->typelib_segment_data[MSFT_SEG_CUSTDATA][offset]) = vt;
            memcpy(&typelib->typelib_segment_data[MSFT_SEG_CUSTDATA][offset+2], value, 4);
            *((unsigned short *)&typelib->typelib_segment_data[MSFT_SEG_CUSTDATA][offset+6]) = 0x5757;
            *out = offset;
        }
        return;
      }
    case VT_BSTR:
      {
        char *s = (char *) value;
        int len = strlen(s), seg_len = (len + 6 + 3) & ~0x3;
        int offset = ctl2_alloc_segment(typelib, MSFT_SEG_CUSTDATA, seg_len, 0);
        *((unsigned short *)&typelib->typelib_segment_data[MSFT_SEG_CUSTDATA][offset]) = vt;
        *((unsigned int *)&typelib->typelib_segment_data[MSFT_SEG_CUSTDATA][offset+2]) = len;        
        memcpy(&typelib->typelib_segment_data[MSFT_SEG_CUSTDATA][offset+6], value, len);
        len += 6;
        while(len < seg_len) {
            *((char *)&typelib->typelib_segment_data[MSFT_SEG_CUSTDATA][offset+len]) = 0x57;
            len++;
        }
        *out = offset;
        return;
      }

    default:
        warning("can't write value of type %d yet\n", vt);
    }
    return;
}

static HRESULT set_custdata(msft_typelib_t *typelib, REFGUID guid,
                            int vt, void *value, int *offset)
{
    MSFT_GuidEntry guidentry;
    int guidoffset;
    int custoffset;
    int *custdata;
    int data_out;

    guidentry.guid = *guid;

    guidentry.hreftype = -1;
    guidentry.next_hash = -1;

    guidoffset = ctl2_alloc_guid(typelib, &guidentry);
    write_value(typelib, &data_out, vt, value);

    custoffset = ctl2_alloc_segment(typelib, MSFT_SEG_CUSTDATAGUID, 12, 0);

    custdata = (int *)&typelib->typelib_segment_data[MSFT_SEG_CUSTDATAGUID][custoffset];
    custdata[0] = guidoffset;
    custdata[1] = data_out;
    custdata[2] = *offset;
    *offset = custoffset;

    return S_OK;
}

static HRESULT add_func_desc(msft_typeinfo_t* typeinfo, const func_t *func, int index)
{
    int offset, name_offset;
    int *typedata, typedata_size;
    int i, id, next_idx;
    int decoded_size, extra_attr = 0;
    int num_params = 0, num_defaults = 0;
    var_t *arg;
    char *namedata;
    const attr_t *attr;
    unsigned int funcflags = 0, callconv = 4 /* CC_STDCALL */;
    unsigned int funckind, invokekind = 1 /* INVOKE_FUNC */;
    int help_context = 0, help_string_context = 0, help_string_offset = -1;
    int entry = -1, entry_is_ord = 0;

    chat("add_func_desc(%p,%d)\n", typeinfo, index);

    id = ((0x6000 | (typeinfo->typeinfo->datatype2 & 0xffff)) << 16) | index;

    switch(typeinfo->typekind) {
    case TKIND_DISPATCH:
        funckind = 0x4; /* FUNC_DISPATCH */
        break;
    case TKIND_MODULE:
        funckind = 0x3; /* FUNC_STATIC */
        break;
    default:
        funckind = 0x1; /* FUNC_PUREVIRTUAL */
        break;
    }

    if (is_local( func->def->attrs )) {
        chat("add_func_desc: skipping local function\n");
        return S_FALSE;
    }

    if (func->args)
      LIST_FOR_EACH_ENTRY( arg, func->args, var_t, entry )
      {
        num_params++;
        if (arg->attrs) LIST_FOR_EACH_ENTRY( attr, arg->attrs, const attr_t, entry ) {
            if(attr->type == ATTR_DEFAULTVALUE_EXPR || attr->type == ATTR_DEFAULTVALUE_STRING) {
                num_defaults++;
                break;
            }
        }
      }

    chat("add_func_desc: num of params %d\n", num_params);

    name_offset = ctl2_alloc_name(typeinfo->typelib, func->def->name);

    if (func->def->attrs) LIST_FOR_EACH_ENTRY( attr, func->def->attrs, const attr_t, entry ) {
        expr_t *expr = attr->u.pval;
        switch(attr->type) {
        case ATTR_ENTRY_ORDINAL:
            extra_attr = max(extra_attr, 3);
            entry = expr->cval;
            entry_is_ord = 1;
            break;
        case ATTR_ENTRY_STRING:
            extra_attr = max(extra_attr, 3);
            entry = ctl2_alloc_string(typeinfo->typelib, attr->u.pval);
            break;
        case ATTR_HELPCONTEXT:
            extra_attr = max(extra_attr, 1);
            help_context = expr->u.lval;
            break;
        case ATTR_HELPSTRING:
            extra_attr = max(extra_attr, 2);
            help_string_offset = ctl2_alloc_string(typeinfo->typelib, attr->u.pval);
            break;
        case ATTR_HELPSTRINGCONTEXT:
            extra_attr = max(extra_attr, 6);
            help_string_context = expr->u.lval;
            break;
        case ATTR_HIDDEN:
            funcflags |= 0x40; /* FUNCFLAG_FHIDDEN */
            break;
        case ATTR_ID:
            id = expr->cval;
            break;
        case ATTR_OUT:
            break;
        case ATTR_PROPGET:
            invokekind = 0x2; /* INVOKE_PROPERTYGET */
            break;
        case ATTR_PROPPUT:
            invokekind = 0x4; /* INVOKE_PROPERTYPUT */
            break;
        case ATTR_PROPPUTREF:
            invokekind = 0x8; /* INVOKE_PROPERTYPUTREF */
            break;
        case ATTR_RESTRICTED:
            funcflags |= 0x1; /* FUNCFLAG_FRESTRICTED */
            break;
        case ATTR_BINDABLE:
            funcflags |= 0x4; /* FUNCFLAG_BINDABLE */
            break;
        default:
            warning("add_func_desc: ignoring attr %d\n", attr->type);
            break;
        }
    }

    switch(invokekind) {
    case 0x2: /* INVOKE_PROPERTYGET */
        if((num_params != 0 && typeinfo->typekind == TKIND_DISPATCH)
           || (num_params != 1 && typeinfo->typekind == TKIND_INTERFACE)) {
            error("expecting no args on a propget func\n");
            return S_FALSE;
        }
        break;
    case 0x4: /* INVOKE_PROPERTYPUT */
    case 0x8: /* INVOKE_PROPERTYPUTREF */
        if(num_params != 1) {
            error("expecting one arg on a propput func\n");
            return S_FALSE;
        }
        break;
    default:
        break;
    }

    /* allocate type data space for us */
    typedata_size = 0x18 + extra_attr * sizeof(int) + (num_params * (num_defaults ? 16 : 12));

    if (!typeinfo->func_data) {
        typeinfo->func_data = xmalloc(0x100);
        typeinfo->func_data_allocated = 0x100;
        typeinfo->func_data[0] = 0;
    }

    if(typeinfo->func_data[0] + typedata_size + sizeof(int) > typeinfo->func_data_allocated) {
        typeinfo->func_data_allocated = max(typeinfo->func_data_allocated * 2,
                                            typeinfo->func_data[0] + typedata_size + sizeof(int));
        typeinfo->func_data = xrealloc(typeinfo->func_data, typeinfo->func_data_allocated);
    }

    offset = typeinfo->func_data[0];
    typeinfo->func_data[0] += typedata_size;
    typedata = typeinfo->func_data + (offset >> 2) + 1;


    /* find func with the same name - if it exists use its id */
    for(i = 0; i < (typeinfo->typeinfo->cElement & 0xffff); i++) {
        if(name_offset == typeinfo->func_names[i]) {
            id = typeinfo->func_indices[i];
            break;
        }
    }

    /* find the first func with the same id and link via the hiword of typedata[4] */
    next_idx = index;
    for(i = 0; i < (typeinfo->typeinfo->cElement & 0xffff); i++) {
        if(id == typeinfo->func_indices[i]) {
            next_idx = typeinfo->func_data[(typeinfo->func_offsets[i] >> 2) + 1 + 4] >> 16;
            typeinfo->func_data[(typeinfo->func_offsets[i] >> 2) + 1 + 4] &= 0xffff;
            typeinfo->func_data[(typeinfo->func_offsets[i] >> 2) + 1 + 4] |= (index << 16);
            break;
        }
    }

    /* fill out the basic type information */
    typedata[0] = typedata_size | (index << 16);
    encode_var(typeinfo->typelib, func->def, &typedata[1], NULL, NULL, &decoded_size);
    typedata[2] = funcflags;
    typedata[3] = ((52 /*sizeof(FUNCDESC)*/ + decoded_size) << 16) | typeinfo->typeinfo->cbSizeVft;
    typedata[4] = (next_idx << 16) | (callconv << 8) | (invokekind << 3) | funckind;
    if(num_defaults) typedata[4] |= 0x1000;
    if(entry_is_ord) typedata[4] |= 0x2000;
    typedata[5] = num_params;

    /* NOTE: High word of typedata[3] is total size of FUNCDESC + size of all ELEMDESCs for params + TYPEDESCs for pointer params and return types. */
    /* That is, total memory allocation required to reconstitute the FUNCDESC in its entirety. */
    typedata[3] += (16 /*sizeof(ELEMDESC)*/ * num_params) << 16;
    typedata[3] += (24 /*sizeof(PARAMDESCEX)*/ * num_defaults) << 16;

    switch(extra_attr) {
    case 6: typedata[11] = help_string_context;
    case 5: typedata[10] = -1;
    case 4: typedata[9] = -1;
    case 3: typedata[8] = entry;
    case 2: typedata[7] = help_string_offset;
    case 1: typedata[6] = help_context;
    case 0:
        break;
    default:
        warning("unknown number of optional attrs\n");
    }

    if (func->args)
    {
      i = 0;
      LIST_FOR_EACH_ENTRY( arg, func->args, var_t, entry )
      {
        const attr_t *attr;
        int paramflags = 0;
        int *paramdata = typedata + 6 + extra_attr + (num_defaults ? num_params : 0) + i * 3;
        int *defaultdata = num_defaults ? typedata + 6 + extra_attr + i : NULL;

        if(defaultdata) *defaultdata = -1;

        encode_var(typeinfo->typelib, arg, paramdata, NULL, NULL, &decoded_size);
        if (arg->attrs) LIST_FOR_EACH_ENTRY( attr, arg->attrs, const attr_t, entry ) {
            switch(attr->type) {
            case ATTR_DEFAULTVALUE_EXPR:
              {
                int vt;
                expr_t *expr = (expr_t *)attr->u.pval;
                if (arg->type->type == RPC_FC_ENUM16)
                    vt = VT_INT;
                else
                    vt = get_var_vt(arg);
                paramflags |= 0x30; /* PARAMFLAG_FHASDEFAULT | PARAMFLAG_FOPT */
                chat("default value %ld\n", expr->cval);
                write_value(typeinfo->typelib, defaultdata, vt, &expr->cval);
                break;
              }
            case ATTR_DEFAULTVALUE_STRING:
              {
                char *s = (char *)attr->u.pval;
                int vt;
                if (arg->type->type == RPC_FC_ENUM16)
                  vt = VT_INT;
                else
                  vt = get_var_vt(arg);
                paramflags |= 0x30; /* PARAMFLAG_FHASDEFAULT | PARAMFLAG_FOPT */
                chat("default value '%s'\n", s);
                write_value(typeinfo->typelib, defaultdata, vt, s);
                break;
              }
            case ATTR_IN:
                paramflags |= 0x01; /* PARAMFLAG_FIN */
                break;
            case ATTR_OPTIONAL:
                paramflags |= 0x10; /* PARAMFLAG_FOPT */
                break;
            case ATTR_OUT:
                paramflags |= 0x02; /* PARAMFLAG_FOUT */
                break;
            case ATTR_RETVAL:
                paramflags |= 0x08; /* PARAMFLAG_FRETVAL */
                typedata[4] |= 0x4000;
                break;
            default:
                chat("unhandled param attr %d\n", attr->type);
                break;
            }
        }
        paramdata[1] = -1;
        paramdata[2] = paramflags;
        typedata[3] += decoded_size << 16;
        i++;
      }
    }

    if(typeinfo->funcs_allocated == 0) {
        typeinfo->funcs_allocated = 10;
        typeinfo->func_indices = xmalloc(typeinfo->funcs_allocated * sizeof(int));
        typeinfo->func_names   = xmalloc(typeinfo->funcs_allocated * sizeof(int));
        typeinfo->func_offsets = xmalloc(typeinfo->funcs_allocated * sizeof(int));
    }
    if(typeinfo->funcs_allocated == (typeinfo->typeinfo->cElement & 0xffff)) {
        typeinfo->funcs_allocated *= 2;
        typeinfo->func_indices = xrealloc(typeinfo->func_indices, typeinfo->funcs_allocated * sizeof(int));
        typeinfo->func_names   = xrealloc(typeinfo->func_names,   typeinfo->funcs_allocated * sizeof(int));
        typeinfo->func_offsets = xrealloc(typeinfo->func_offsets, typeinfo->funcs_allocated * sizeof(int));
    }

    /* update the index data */
    typeinfo->func_indices[typeinfo->typeinfo->cElement & 0xffff] = id; 
    typeinfo->func_offsets[typeinfo->typeinfo->cElement & 0xffff] = offset;
    typeinfo->func_names[typeinfo->typeinfo->cElement & 0xffff] = name_offset;

    /* ??? */
    if (!typeinfo->typeinfo->res2) typeinfo->typeinfo->res2 = 0x20;
    typeinfo->typeinfo->res2 <<= 1;
    /* ??? */
    if (index < 2) typeinfo->typeinfo->res2 += num_params << 4;

    if (typeinfo->typeinfo->res3 == -1) typeinfo->typeinfo->res3 = 0;
    typeinfo->typeinfo->res3 += 0x38 + num_params * 0x10;
    if(num_defaults) typeinfo->typeinfo->res3 += num_params * 0x4;

    /* adjust size of VTBL */
    if(funckind != 0x3 /* FUNC_STATIC */)
        typeinfo->typeinfo->cbSizeVft += 4;

    /* Increment the number of function elements */
    typeinfo->typeinfo->cElement += 1;

    namedata = typeinfo->typelib->typelib_segment_data[MSFT_SEG_NAME] + name_offset;
    if (*((INT *)namedata) == -1) {
        *((INT *)namedata) = typeinfo->typelib->typelib_typeinfo_offsets[typeinfo->typeinfo->typekind >> 16];
        if(typeinfo->typekind == TKIND_MODULE)
            namedata[9] |= 0x10;
    } else
        namedata[9] &= ~0x10;

    if(typeinfo->typekind == TKIND_MODULE)
        namedata[9] |= 0x20;

    if(invokekind != 0x4 /* INVOKE_PROPERTYPUT */ && invokekind != 0x8 /* INVOKE_PROPERTYPUTREF */) { 
        /* don't give the arg of a [propput*] func a name */
        if (func->args)
        {
          i = 0;
          LIST_FOR_EACH_ENTRY( arg, func->args, var_t, entry )
          {
            int *paramdata = typedata + 6 + extra_attr + (num_defaults ? num_params : 0) + i * 3;
            offset = ctl2_alloc_name(typeinfo->typelib, arg->name);
            paramdata[1] = offset;
            i++;
          }
        }
    }
    return S_OK;
}

static HRESULT add_var_desc(msft_typeinfo_t *typeinfo, UINT index, var_t* var)
{
    int offset, id;
    unsigned int typedata_size;
    INT *typedata;
    int var_datawidth;
    int var_alignment;
    int var_type_size, var_kind = 0 /* VAR_PERINSTANCE */; 
    int alignment;
    int varflags = 0;
    const attr_t *attr;
    char *namedata;
    int var_num = (typeinfo->typeinfo->cElement >> 16) & 0xffff;

    chat("add_var_desc(%d,%s) array %p\n", index, var->name, var->array);

    id = 0x40000000 + index;

    if (var->attrs) LIST_FOR_EACH_ENTRY( attr, var->attrs, const attr_t, entry ) {
        expr_t *expr = attr->u.pval;
        switch(attr->type) {
        case ATTR_HIDDEN:
            varflags |= 0x40; /* VARFLAG_FHIDDEN */
            break;
        case ATTR_ID:
            id = expr->cval;
            break;
        case ATTR_READONLY:
            varflags |= 0x01; /* VARFLAG_FREADONLY */
            break;
        case ATTR_RESTRICTED:
            varflags |= 0x80; /* VARFLAG_FRESTRICTED */
            break;
        case ATTR_SOURCE:
            varflags |= 0x02; /* VARFLAG_FSOURCE */
            break;
        default:
            warning("AddVarDesc: unhandled attr type %d\n", attr->type);
            break;
        }
    }

    /* allocate type data space for us */
    typedata_size = 0x14;

    if (!typeinfo->var_data) {
        typeinfo->var_data = xmalloc(0x100);
        typeinfo->var_data_allocated = 0x100;
        typeinfo->var_data[0] = 0;
    }

    if(typeinfo->var_data[0] + typedata_size + sizeof(int) > typeinfo->var_data_allocated) {
        typeinfo->var_data_allocated = max(typeinfo->var_data_allocated * 2,
                                            typeinfo->var_data[0] + typedata_size + sizeof(int));
        typeinfo->var_data = xrealloc(typeinfo->var_data, typeinfo->var_data_allocated);
    }

    offset = typeinfo->var_data[0];
    typeinfo->var_data[0] += typedata_size;
    typedata = typeinfo->var_data + (offset >> 2) + 1;

    /* fill out the basic type information */
    typedata[0] = typedata_size | (index << 16);
    typedata[2] = varflags;
    typedata[3] = (36 /*sizeof(VARDESC)*/ << 16) | 0;

    if(typeinfo->vars_allocated == 0) {
        typeinfo->vars_allocated = 10;
        typeinfo->var_indices = xmalloc(typeinfo->vars_allocated * sizeof(int));
        typeinfo->var_names   = xmalloc(typeinfo->vars_allocated * sizeof(int));
        typeinfo->var_offsets = xmalloc(typeinfo->vars_allocated * sizeof(int));
    }
    if(typeinfo->vars_allocated == var_num) {
        typeinfo->vars_allocated *= 2;
        typeinfo->var_indices = xrealloc(typeinfo->var_indices, typeinfo->vars_allocated * sizeof(int));
        typeinfo->var_names   = xrealloc(typeinfo->var_names,   typeinfo->vars_allocated * sizeof(int));
        typeinfo->var_offsets = xrealloc(typeinfo->var_offsets, typeinfo->vars_allocated * sizeof(int));
    }
    /* update the index data */
    typeinfo->var_indices[var_num] = id;
    typeinfo->var_names[var_num] = -1;
    typeinfo->var_offsets[var_num] = offset;

    /* figure out type widths and whatnot */
    encode_var(typeinfo->typelib, var, &typedata[1], &var_datawidth,
               &var_alignment, &var_type_size);

    /* pad out starting position to data width */
    typeinfo->datawidth += var_alignment - 1;
    typeinfo->datawidth &= ~(var_alignment - 1);

    switch(typeinfo->typekind) {
    case TKIND_ENUM:
        write_value(typeinfo->typelib, &typedata[4], VT_I4, &var->eval->cval);
        var_kind = 2; /* VAR_CONST */
        var_type_size += 16; /* sizeof(VARIANT) */
        typeinfo->datawidth = var_datawidth;
        break;
    case TKIND_RECORD:
        typedata[4] = typeinfo->datawidth;
        typeinfo->datawidth += var_datawidth;
        break;
    case TKIND_DISPATCH:
        var_kind = 3; /* VAR_DISPATCH */
        typeinfo->datawidth = 4;
        var_alignment = 4;
        break;
    default:
        error("add_var_desc: unhandled type kind %d\n", typeinfo->typekind);
        break;
    }

    /* add type description size to total required allocation */
    typedata[3] += var_type_size << 16 | var_kind;

    /* fix type alignment */
    alignment = (typeinfo->typeinfo->typekind >> 11) & 0x1f;
    if (alignment < var_alignment) {
        alignment = var_alignment;
        typeinfo->typeinfo->typekind &= ~0xffc0;
        typeinfo->typeinfo->typekind |= alignment << 11 | alignment << 6;
    }

    /* ??? */
    if (!typeinfo->typeinfo->res2) typeinfo->typeinfo->res2 = 0x1a;
    if ((index == 0) || (index == 1) || (index == 2) || (index == 4) || (index == 9)) {
        typeinfo->typeinfo->res2 <<= 1;
    }

    /* ??? */
    if (typeinfo->typeinfo->res3 == -1) typeinfo->typeinfo->res3 = 0;
    typeinfo->typeinfo->res3 += 0x2c;

    /* increment the number of variable elements */
    typeinfo->typeinfo->cElement += 0x10000;

    /* pad data width to alignment */
    typeinfo->typeinfo->size = (typeinfo->datawidth + (alignment - 1)) & ~(alignment - 1);

    offset = ctl2_alloc_name(typeinfo->typelib, var->name);
    if (offset == -1) return E_OUTOFMEMORY;

    namedata = typeinfo->typelib->typelib_segment_data[MSFT_SEG_NAME] + offset;
    if (*((INT *)namedata) == -1) {
        *((INT *)namedata) = typeinfo->typelib->typelib_typeinfo_offsets[typeinfo->typeinfo->typekind >> 16];
        if(typeinfo->typekind != TKIND_DISPATCH)
            namedata[9] |= 0x10;
    } else
        namedata[9] &= ~0x10;

    if (typeinfo->typekind == TKIND_ENUM) {
        namedata[9] |= 0x20;
    }
    typeinfo->var_names[var_num] = offset;

    return S_OK;
}

static HRESULT add_impl_type(msft_typeinfo_t *typeinfo, type_t *ref, importinfo_t *importinfo)
{
    if(importinfo) {
        alloc_importinfo(typeinfo->typelib, importinfo);
        typeinfo->typeinfo->datatype1 = importinfo->offset+1;
    }else {
        if(ref->typelib_idx == -1)
            add_interface_typeinfo(typeinfo->typelib, ref);
        if(ref->typelib_idx == -1)
            error("add_impl_type: unable to add inherited interface\n");

        typeinfo->typeinfo->datatype1 = typeinfo->typelib->typelib_typeinfo_offsets[ref->typelib_idx];
    }

    typeinfo->typeinfo->cImplTypes++;
    return S_OK;
}

static msft_typeinfo_t *create_msft_typeinfo(msft_typelib_t *typelib, enum type_kind kind,
                                             const char *name, const attr_list_t *attrs)
{
    const attr_t *attr;
    msft_typeinfo_t *msft_typeinfo;
    int nameoffset;
    int typeinfo_offset;
    MSFT_TypeInfoBase *typeinfo;
    MSFT_GuidEntry guidentry;

    chat("create_msft_typeinfo: name %s kind %d\n", name, kind);

    msft_typeinfo = xmalloc(sizeof(*msft_typeinfo));
    memset( msft_typeinfo, 0, sizeof(*msft_typeinfo) );

    msft_typeinfo->typelib = typelib;

    nameoffset = ctl2_alloc_name(typelib, name);
    typeinfo_offset = ctl2_alloc_typeinfo(typelib, nameoffset);
    typeinfo = (MSFT_TypeInfoBase *)&typelib->typelib_segment_data[MSFT_SEG_TYPEINFO][typeinfo_offset];

    typelib->typelib_segment_data[MSFT_SEG_NAME][nameoffset + 9] = 0x38;
    *((int *)&typelib->typelib_segment_data[MSFT_SEG_NAME][nameoffset]) = typeinfo_offset;

    msft_typeinfo->typekind = kind;
    msft_typeinfo->typeinfo = typeinfo;

    typeinfo->typekind |= kind | 0x20;

    if(kind == TKIND_COCLASS)
        typeinfo->flags |= 0x2; /* TYPEFLAG_FCANCREATE */

    if (attrs) LIST_FOR_EACH_ENTRY( attr, attrs, const attr_t, entry ) {
        switch(attr->type) {
        case ATTR_AGGREGATABLE:
            if (kind == TKIND_COCLASS)
                typeinfo->flags |= 0x400; /* TYPEFLAG_FAGGREGATABLE */
            break;

        case ATTR_APPOBJECT:
            if (kind == TKIND_COCLASS)
                typeinfo->flags |= 0x1; /* TYPEFLAG_FAPPOBJECT */
            break;

        case ATTR_CONTROL:
            if (kind == TKIND_COCLASS)
                typeinfo->flags |= 0x20; /* TYPEFLAG_FCONTROL */
            break;

        case ATTR_DISPINTERFACE:
            break;

        case ATTR_DLLNAME:
          {
            int offset = ctl2_alloc_string(typelib, attr->u.pval);
            typeinfo->datatype1 = offset;
            break;
          }

        case ATTR_DUAL:
            /* FIXME: check interface is compatible */
            typeinfo->typekind = (typeinfo->typekind & ~0xff) | 0x34;
            typeinfo->flags |= 0x140; /* TYPEFLAG_FDUAL | TYPEFLAG_FOLEAUTOMATION */
            break;

        case ATTR_HELPCONTEXT:
          {
            expr_t *expr = (expr_t*)attr->u.pval;
            typeinfo->helpcontext = expr->cval;
            break;
          }
        case ATTR_HELPSTRING:
          {
            int offset = ctl2_alloc_string(typelib, attr->u.pval);
            if (offset == -1) break;
            typeinfo->docstringoffs = offset;
            break;
          }
        case ATTR_HELPSTRINGCONTEXT:
          {
            expr_t *expr = (expr_t*)attr->u.pval;
            typeinfo->helpstringcontext = expr->cval;
            break;
          }
        case ATTR_HIDDEN:
            typeinfo->flags |= 0x10; /* TYPEFLAG_FHIDDEN */
            break;

        case ATTR_NONCREATABLE:
            typeinfo->flags &= ~0x2; /* TYPEFLAG_FCANCREATE */
            break;

        case ATTR_NONEXTENSIBLE:
            typeinfo->flags |= 0x80; /* TYPEFLAG_FNONEXTENSIBLE */
            break;

        case ATTR_OBJECT:
            break;

        case ATTR_ODL:
            break;

        case ATTR_OLEAUTOMATION:
            typeinfo->flags |= 0x100; /* TYPEFLAG_FOLEAUTOMATION */
            break;

        case ATTR_PUBLIC:
            break;

        case ATTR_RESTRICTED:
            typeinfo->flags |= 0x200; /* TYPEFLAG_FRESTRICTED */
            break;

        case ATTR_UUID:
            guidentry.guid = *(GUID*)attr->u.pval;
            guidentry.hreftype = typelib->typelib_typeinfo_offsets[typeinfo->typekind >> 16];
            guidentry.next_hash = -1;
            typeinfo->posguid = ctl2_alloc_guid(typelib, &guidentry);
#if 0
            if (IsEqualIID(guid, &IID_IDispatch)) {
                typelib->typelib_header.dispatchpos = typelib->typelib_typeinfo_offsets[typeinfo->typekind >> 16];
            }
#endif
            break;

        case ATTR_VERSION:
            typeinfo->version = attr->u.ival;
            break;

        default:
            warning("create_msft_typeinfo: ignoring attr %d\n", attr->type);
            break;
        }
    }

    if (typelib->last_typeinfo) typelib->last_typeinfo->next_typeinfo = msft_typeinfo;
    typelib->last_typeinfo = msft_typeinfo;
    if (!typelib->typeinfos) typelib->typeinfos = msft_typeinfo;


    return msft_typeinfo;
}

static void add_dispatch(msft_typelib_t *typelib)
{
    int guid_offset, impfile_offset;
    MSFT_GuidEntry guidentry;
    MSFT_ImpInfo impinfo;
    GUID stdole =        {0x00020430,0x0000,0x0000,{0xc0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}};
    GUID iid_idispatch = {0x00020400,0x0000,0x0000,{0xc0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}};

    if(typelib->typelib_header.dispatchpos != -1) return;

    guidentry.guid = stdole;
    guidentry.hreftype = 2;
    guidentry.next_hash = -1;
    guid_offset = ctl2_alloc_guid(typelib, &guidentry);
    impfile_offset = alloc_importfile(typelib, guid_offset, 2, 0, "stdole2.tlb");

    guidentry.guid = iid_idispatch;
    guidentry.hreftype = 1;
    guidentry.next_hash = -1;
    impinfo.flags = TKIND_INTERFACE << 24 | MSFT_IMPINFO_OFFSET_IS_GUID;
    impinfo.oImpFile = impfile_offset;
    impinfo.oGuid = ctl2_alloc_guid(typelib, &guidentry);
    typelib->typelib_header.dispatchpos = alloc_msft_importinfo(typelib, &impinfo) | 0x01;
}

static void add_dispinterface_typeinfo(msft_typelib_t *typelib, type_t *dispinterface)
{ 
    int idx = 0;
    const func_t *func;
    var_t *var;
    msft_typeinfo_t *msft_typeinfo;

    if (-1 < dispinterface->typelib_idx)
        return;

    dispinterface->typelib_idx = typelib->typelib_header.nrtypeinfos;
    msft_typeinfo = create_msft_typeinfo(typelib, TKIND_DISPATCH, dispinterface->name,
                                         dispinterface->attrs);

    msft_typeinfo->typeinfo->size = 4;
    msft_typeinfo->typeinfo->typekind |= 0x2100;

    msft_typeinfo->typeinfo->flags |= 0x1000; /* TYPEFLAG_FDISPATCHABLE */
    add_dispatch(typelib);
    msft_typeinfo->typeinfo->cImplTypes = 1;

    /* count the no of funcs, as the variable indices come after the funcs */
    if (dispinterface->funcs)
        LIST_FOR_EACH_ENTRY( func, dispinterface->funcs, const func_t, entry ) idx++;

    if (dispinterface->fields)
        LIST_FOR_EACH_ENTRY( var, dispinterface->fields, var_t, entry )
            add_var_desc(msft_typeinfo, idx++, var);

    if (dispinterface->funcs)
    {
        idx = 0;
        LIST_FOR_EACH_ENTRY( func, dispinterface->funcs, const func_t, entry )
            if(add_func_desc(msft_typeinfo, func, idx) == S_OK)
                idx++;
    }
}

static void add_interface_typeinfo(msft_typelib_t *typelib, type_t *interface)
{
    int idx = 0;
    const func_t *func;
    type_t *ref;
    msft_typeinfo_t *msft_typeinfo;
    importinfo_t *ref_importinfo = NULL;
    int num_parents = 0, num_funcs = 0;
    const type_t *derived;

    if (-1 < interface->typelib_idx)
        return;

    if (is_attr(interface->attrs, ATTR_DISPINTERFACE))
        return add_dispinterface_typeinfo(typelib, interface);

    /* midl adds the parent interface first, unless the parent itself
       has no parent (i.e. it stops before IUnknown). */

    if(interface->ref) {
        ref_importinfo = find_importinfo(typelib, interface->ref->name);

        if(!ref_importinfo && interface->ref->ref && interface->ref->typelib_idx == -1)
            add_interface_typeinfo(typelib, interface->ref);
    }

    interface->typelib_idx = typelib->typelib_header.nrtypeinfos;
    msft_typeinfo = create_msft_typeinfo(typelib, TKIND_INTERFACE, interface->name, interface->attrs);
    msft_typeinfo->typeinfo->size = 4;
    msft_typeinfo->typeinfo->typekind |= 0x2200;

    for (derived = interface->ref; derived; derived = derived->ref)
        if (derived->name && !strcmp(derived->name, "IDispatch"))
            msft_typeinfo->typeinfo->flags |= 0x1000; /* TYPEFLAG_FDISPATCHABLE */

    /* can't be dual if it doesn't derive from IDispatch */
    if (!(msft_typeinfo->typeinfo->flags & 0x1000)) /* TYPEFLAG_FDISPATCHABLE */
        msft_typeinfo->typeinfo->flags &= ~0x40; /* TYPEFLAG_FDUAL */

    if(interface->ref)
        add_impl_type(msft_typeinfo, interface->ref, ref_importinfo);

    /* count the number of inherited interfaces and non-local functions */
    for(ref = interface->ref; ref; ref = ref->ref) {
        num_parents++;
        if (ref->funcs)
            LIST_FOR_EACH_ENTRY( func, ref->funcs, const func_t, entry )
                if (!is_local(func->def->attrs)) num_funcs++;
    }
    msft_typeinfo->typeinfo->datatype2 = num_funcs << 16 | num_parents;
    msft_typeinfo->typeinfo->cbSizeVft = num_funcs * 4;

    if (interface->funcs)
        LIST_FOR_EACH_ENTRY( func, interface->funcs, const func_t, entry )
            if(add_func_desc(msft_typeinfo, func, idx) == S_OK)
                idx++;
}

static void add_structure_typeinfo(msft_typelib_t *typelib, type_t *structure)
{
    int idx = 0;
    var_t *cur;
    msft_typeinfo_t *msft_typeinfo;

    if (-1 < structure->typelib_idx)
        return;

    structure->typelib_idx = typelib->typelib_header.nrtypeinfos;
    msft_typeinfo = create_msft_typeinfo(typelib, TKIND_RECORD, structure->name, structure->attrs);
    msft_typeinfo->typeinfo->size = 0;

    if (structure->fields)
        LIST_FOR_EACH_ENTRY( cur, structure->fields, var_t, entry )
            add_var_desc(msft_typeinfo, idx++, cur);
}

static void add_enum_typeinfo(msft_typelib_t *typelib, type_t *enumeration)
{
    int idx = 0;
    var_t *cur;
    msft_typeinfo_t *msft_typeinfo;

    enumeration->typelib_idx = typelib->typelib_header.nrtypeinfos;
    msft_typeinfo = create_msft_typeinfo(typelib, TKIND_ENUM, enumeration->name, enumeration->attrs);
    msft_typeinfo->typeinfo->size = 0;

    if (enumeration->fields)
        LIST_FOR_EACH_ENTRY( cur, enumeration->fields, var_t, entry )
            add_var_desc(msft_typeinfo, idx++, cur);
}

static void add_typedef_typeinfo(msft_typelib_t *typelib, type_t *tdef)
{
    msft_typeinfo_t *msft_typeinfo;
    int alignment;

    if (-1 < tdef->typelib_idx)
        return;

    tdef->typelib_idx = typelib->typelib_header.nrtypeinfos;
    msft_typeinfo = create_msft_typeinfo(typelib, TKIND_ALIAS, tdef->name, tdef->attrs);
    encode_type(typelib, get_type_vt(tdef->orig), tdef->orig, &msft_typeinfo->typeinfo->datatype1, &msft_typeinfo->typeinfo->size,
               &alignment, &msft_typeinfo->typeinfo->datatype2);
    msft_typeinfo->typeinfo->typekind |= (alignment << 11 | alignment << 6);
}

static void add_coclass_typeinfo(msft_typelib_t *typelib, type_t *cls)
{
    msft_typeinfo_t *msft_typeinfo;
    ifref_t *iref;
    int num_ifaces = 0, offset, i;
    MSFT_RefRecord *ref, *first = NULL, *first_source = NULL;
    int have_default = 0, have_default_source = 0;
    const attr_t *attr;

    if (-1 < cls->typelib_idx)
        return;

    cls->typelib_idx = typelib->typelib_header.nrtypeinfos;
    msft_typeinfo = create_msft_typeinfo(typelib, TKIND_COCLASS, cls->name, cls->attrs);

    if (cls->ifaces) LIST_FOR_EACH_ENTRY( iref, cls->ifaces, ifref_t, entry ) num_ifaces++;

    offset = msft_typeinfo->typeinfo->datatype1 = ctl2_alloc_segment(typelib, MSFT_SEG_REFERENCES,
                                                                     num_ifaces * sizeof(*ref), 0);

    i = 0;
    if (cls->ifaces) LIST_FOR_EACH_ENTRY( iref, cls->ifaces, ifref_t, entry ) {
        if(iref->iface->typelib_idx == -1)
            add_interface_typeinfo(typelib, iref->iface);
        ref = (MSFT_RefRecord*) (typelib->typelib_segment_data[MSFT_SEG_REFERENCES] + offset + i * sizeof(*ref));
        ref->reftype = typelib->typelib_typeinfo_offsets[iref->iface->typelib_idx];
        ref->flags = 0;
        ref->oCustData = -1;
        ref->onext = -1;
        if(i < num_ifaces - 1)
            ref->onext = offset + (i + 1) * sizeof(*ref);

        if (iref->attrs) LIST_FOR_EACH_ENTRY( attr, iref->attrs, const attr_t, entry ) {
            switch(attr->type) {
            case ATTR_DEFAULT:
                ref->flags |= 0x1; /* IMPLTYPEFLAG_FDEFAULT */
                break;
            case ATTR_RESTRICTED:
                ref->flags |= 0x4; /* IMPLTYPEFLAG_FRESTRICTED */
                break;
            case ATTR_SOURCE:
                ref->flags |= 0x2; /* IMPLTYPEFLAG_FSOURCE */
                break;
            default:
                warning("add_coclass_typeinfo: unhandled attr %d\n", attr->type);
            }
        }
        if(ref->flags & 0x1) { /* IMPLTYPEFLAG_FDEFAULT */
            if(ref->flags & 0x2) /* IMPLTYPEFLAG_SOURCE */
                have_default_source = 1;
            else
                have_default = 1;
        }

        /* If the interface is non-restricted and we haven't already had one then
           remember it so that we can use it as a default later */
        if((ref->flags & 0x4) == 0) { /* IMPLTYPEFLAG_FRESTRICTED */
            if(ref->flags & 0x2) { /* IMPLTYPEFLAG_FSOURCE */
                if(!first_source)
                    first_source = ref;
            }
            else if(!first)
                first = ref;
        }
        i++;
    }

    /* If we haven't had a default interface, then set the default flags on the
       first ones */
    if(!have_default && first)
        first->flags |= 0x1;
    if(!have_default_source && first_source)
        first_source->flags |= 0x1;

    msft_typeinfo->typeinfo->cImplTypes = num_ifaces;
    msft_typeinfo->typeinfo->size = 4;
    msft_typeinfo->typeinfo->typekind |= 0x2200;
}

static void add_module_typeinfo(msft_typelib_t *typelib, type_t *module)
{
    int idx = 0;
    const func_t *func;
    msft_typeinfo_t *msft_typeinfo;

    if (-1 < module->typelib_idx)
        return;

    module->typelib_idx = typelib->typelib_header.nrtypeinfos;
    msft_typeinfo = create_msft_typeinfo(typelib, TKIND_MODULE, module->name, module->attrs);
    msft_typeinfo->typeinfo->typekind |= 0x0a00;

    if (module->funcs)
        LIST_FOR_EACH_ENTRY( func, module->funcs, const func_t, entry )
            if(add_func_desc(msft_typeinfo, func, idx) == S_OK)
                idx++;

    msft_typeinfo->typeinfo->size = idx;
}

static void add_entry(msft_typelib_t *typelib, typelib_entry_t *entry)
{
    switch(entry->type->kind) {
    case TKIND_INTERFACE:
    case TKIND_DISPATCH:
        add_interface_typeinfo(typelib, entry->type);
        break;

    case TKIND_RECORD:
        add_structure_typeinfo(typelib, entry->type);
        break;

    case TKIND_ENUM:
        add_enum_typeinfo(typelib, entry->type);
        break;

    case TKIND_ALIAS:
        add_typedef_typeinfo(typelib, entry->type);
        break;

    case TKIND_COCLASS:
        add_coclass_typeinfo(typelib, entry->type);
        break;

    case TKIND_MODULE:
        add_module_typeinfo(typelib, entry->type);
        break;

    default:
        error("add_entry: unhandled type %d\n", entry->type->kind);
        break;
    }
}

static void set_name(msft_typelib_t *typelib)
{
    int offset;

    offset = ctl2_alloc_name(typelib, typelib->typelib->name);
    if (offset == -1) return;
    typelib->typelib_header.NameOffset = offset;
    return;
}

static void set_version(msft_typelib_t *typelib)
{
    typelib->typelib_header.version = get_attrv( typelib->typelib->attrs, ATTR_VERSION );
}

static void set_guid(msft_typelib_t *typelib)
{
    MSFT_GuidEntry guidentry;
    int offset;
    void *ptr;
    GUID guid = {0,0,0,{0,0,0,0,0,0}};

    guidentry.guid = guid;
    guidentry.hreftype = -2;
    guidentry.next_hash = -1;

    ptr = get_attrp( typelib->typelib->attrs, ATTR_UUID );
    if (ptr) guidentry.guid = *(GUID *)ptr;

    offset = ctl2_alloc_guid(typelib, &guidentry);
    typelib->typelib_header.posguid = offset;

    return;
}

static void set_doc_string(msft_typelib_t *typelib)
{
    char *str = get_attrp( typelib->typelib->attrs, ATTR_HELPSTRING );

    if (str)
    {
        int offset = ctl2_alloc_string(typelib, str);
        if (offset != -1) typelib->typelib_header.helpstring = offset;
    }
}

static void set_help_file_name(msft_typelib_t *typelib)
{
    char *str = get_attrp( typelib->typelib->attrs, ATTR_HELPFILE );

    if (str)
    {
        int offset = ctl2_alloc_string(typelib, str);
        if (offset != -1)
        {
            typelib->typelib_header.helpfile = offset;
            typelib->typelib_header.varflags |= 0x10;
        }
    }
}

static void set_help_context(msft_typelib_t *typelib)
{
    const expr_t *expr = get_attrp( typelib->typelib->attrs, ATTR_HELPCONTEXT );
    if (expr) typelib->typelib_header.helpcontext = expr->cval;
}

static void set_help_string_dll(msft_typelib_t *typelib)
{
    char *str = get_attrp( typelib->typelib->attrs, ATTR_HELPSTRINGDLL );

    if (str)
    {
        int offset = ctl2_alloc_string(typelib, str);
        if (offset != -1)
        {
            typelib->help_string_dll_offset = offset;
            typelib->typelib_header.varflags |= 0x100;
        }
    }
}

static void set_help_string_context(msft_typelib_t *typelib)
{
    const expr_t *expr = get_attrp( typelib->typelib->attrs, ATTR_HELPSTRINGCONTEXT );
    if (expr) typelib->typelib_header.helpstringcontext = expr->cval;
}

static void set_lcid(msft_typelib_t *typelib)
{
    typelib->typelib_header.lcid2 = 0x0;
    return;
}

static void set_lib_flags(msft_typelib_t *typelib)
{
    const attr_t *attr;

    typelib->typelib_header.flags = 0;
    if (!typelib->typelib->attrs) return;
    LIST_FOR_EACH_ENTRY( attr, typelib->typelib->attrs, const attr_t, entry )
    {
        switch(attr->type) {
        case ATTR_CONTROL:
            typelib->typelib_header.flags |= 0x02; /* LIBFLAG_FCONTROL */
            break;
        case ATTR_HIDDEN:
            typelib->typelib_header.flags |= 0x04; /* LIBFLAG_FHIDDEN */
            break;
        case ATTR_RESTRICTED:
            typelib->typelib_header.flags |= 0x01; /* LIBFLAG_FRESTRICTED */
            break;
        default:
            break;
        }
    }
    return;
}

static int ctl2_write_chunk(int fd, void *segment, int length)
{
    if (write(fd, segment, length) != length) {
        close(fd);
        return 0;
    }
    return -1;
}

static int ctl2_write_segment(msft_typelib_t *typelib, int fd, int segment)
{
    if (write(fd, typelib->typelib_segment_data[segment], typelib->typelib_segdir[segment].length)
        != typelib->typelib_segdir[segment].length) {
        close(fd);
        return 0;
    }

    return -1;
}

static void ctl2_finalize_typeinfos(msft_typelib_t *typelib, int filesize)
{
    msft_typeinfo_t *typeinfo;

    for (typeinfo = typelib->typeinfos; typeinfo; typeinfo = typeinfo->next_typeinfo) {
        typeinfo->typeinfo->memoffset = filesize;
        if (typeinfo->func_data)
            filesize += typeinfo->func_data[0] + ((typeinfo->typeinfo->cElement & 0xffff) * 12);
        if (typeinfo->var_data)
            filesize += typeinfo->var_data[0] + (((typeinfo->typeinfo->cElement >> 16) & 0xffff) * 12);
        if (typeinfo->func_data || typeinfo->var_data)
            filesize += 4;
    }
}

static int ctl2_finalize_segment(msft_typelib_t *typelib, int filepos, int segment)
{
    if (typelib->typelib_segdir[segment].length) {
        typelib->typelib_segdir[segment].offset = filepos;
    } else {
        typelib->typelib_segdir[segment].offset = -1;
    }

    return typelib->typelib_segdir[segment].length;
}


static void ctl2_write_typeinfos(msft_typelib_t *typelib, int fd)
{
    msft_typeinfo_t *typeinfo;
    int typedata_size;

    for (typeinfo = typelib->typeinfos; typeinfo; typeinfo = typeinfo->next_typeinfo) {
        if (!typeinfo->func_data && !typeinfo->var_data) continue;
        typedata_size = 0;
        if (typeinfo->func_data)
            typedata_size = typeinfo->func_data[0];
        if (typeinfo->var_data)
            typedata_size += typeinfo->var_data[0];
        ctl2_write_chunk(fd, &typedata_size, sizeof(int));
        if (typeinfo->func_data)
            ctl2_write_chunk(fd, typeinfo->func_data + 1, typeinfo->func_data[0]);
        if (typeinfo->var_data)
            ctl2_write_chunk(fd, typeinfo->var_data + 1, typeinfo->var_data[0]);
        if (typeinfo->func_indices)
            ctl2_write_chunk(fd, typeinfo->func_indices, (typeinfo->typeinfo->cElement & 0xffff) * 4);
        if (typeinfo->var_indices)
            ctl2_write_chunk(fd, typeinfo->var_indices, (typeinfo->typeinfo->cElement >> 16) * 4);
        if (typeinfo->func_names)
            ctl2_write_chunk(fd, typeinfo->func_names,   (typeinfo->typeinfo->cElement & 0xffff) * 4);
        if (typeinfo->var_names)
            ctl2_write_chunk(fd, typeinfo->var_names,   (typeinfo->typeinfo->cElement >> 16) * 4); 
        if (typeinfo->func_offsets)
            ctl2_write_chunk(fd, typeinfo->func_offsets, (typeinfo->typeinfo->cElement & 0xffff) * 4);
        if (typeinfo->var_offsets) {
            int add = 0, i, offset;
            if(typeinfo->func_data)
                add = typeinfo->func_data[0];
            for(i = 0; i < (typeinfo->typeinfo->cElement >> 16); i++) {
                offset = typeinfo->var_offsets[i];
                offset += add;
                ctl2_write_chunk(fd, &offset, 4);
            }
        }
    }
}

static int save_all_changes(msft_typelib_t *typelib)
{
    int retval;
    int filepos;
    int fd;

    chat("save_all_changes(%p)\n", typelib);

    retval = TYPE_E_IOERROR;

    fd = creat(typelib->typelib->filename, 0666);
    if (fd == -1) return retval;

    filepos = sizeof(MSFT_Header) + sizeof(MSFT_SegDir);
    if(typelib->typelib_header.varflags & 0x100) filepos += 4; /* helpstringdll */
    filepos += typelib->typelib_header.nrtypeinfos * 4;

    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_TYPEINFO);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_GUIDHASH);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_GUID);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_REFERENCES);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_IMPORTINFO);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_IMPORTFILES);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_NAMEHASH);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_NAME);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_STRING);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_TYPEDESC);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_ARRAYDESC);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_CUSTDATA);
    filepos += ctl2_finalize_segment(typelib, filepos, MSFT_SEG_CUSTDATAGUID);

    ctl2_finalize_typeinfos(typelib, filepos);

    if (!ctl2_write_chunk(fd, &typelib->typelib_header, sizeof(typelib->typelib_header))) return retval;
    if(typelib->typelib_header.varflags & 0x100)
        if (!ctl2_write_chunk(fd, &typelib->help_string_dll_offset, sizeof(typelib->help_string_dll_offset)))
            return retval;

    if (!ctl2_write_chunk(fd, typelib->typelib_typeinfo_offsets, typelib->typelib_header.nrtypeinfos * 4)) return retval;
    if (!ctl2_write_chunk(fd, &typelib->typelib_segdir, sizeof(typelib->typelib_segdir))) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_TYPEINFO    )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_GUIDHASH    )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_GUID        )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_REFERENCES  )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_IMPORTINFO  )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_IMPORTFILES )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_NAMEHASH    )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_NAME        )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_STRING      )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_TYPEDESC    )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_ARRAYDESC   )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_CUSTDATA    )) return retval;
    if (!ctl2_write_segment(typelib, fd, MSFT_SEG_CUSTDATAGUID)) return retval;

    ctl2_write_typeinfos(typelib, fd);

    if (close(fd) == -1) return retval;

    retval = S_OK;
    return retval;
}

int create_msft_typelib(typelib_t *typelib)
{
    msft_typelib_t *msft;
    int failed = 0;
    typelib_entry_t *entry;
    time_t cur_time;
    unsigned int version = 5 << 24 | 1 << 16 | 164; /* 5.01.0164 */
    GUID midl_time_guid    = {0xde77ba63,0x517c,0x11d1,{0xa2,0xda,0x00,0x00,0xf8,0x77,0x3c,0xe9}}; 
    GUID midl_version_guid = {0xde77ba64,0x517c,0x11d1,{0xa2,0xda,0x00,0x00,0xf8,0x77,0x3c,0xe9}}; 

    msft = xmalloc(sizeof(*msft));
    memset(msft, 0, sizeof(*msft));
    msft->typelib = typelib;

    ctl2_init_header(msft);
    ctl2_init_segdir(msft);

    msft->typelib_header.varflags |= SYS_WIN32;

    /*
     * The following two calls return an offset or -1 if out of memory. We
     * specifically need an offset of 0, however, so...
     */
    if (ctl2_alloc_segment(msft, MSFT_SEG_GUIDHASH, 0x80, 0x80)) { failed = 1; }
    if (ctl2_alloc_segment(msft, MSFT_SEG_NAMEHASH, 0x200, 0x200)) { failed = 1; }

    if(failed)
    {
        free(msft);
        return 0;
    }

    msft->typelib_guidhash_segment = (int *)msft->typelib_segment_data[MSFT_SEG_GUIDHASH];
    msft->typelib_namehash_segment = (int *)msft->typelib_segment_data[MSFT_SEG_NAMEHASH];

    memset(msft->typelib_guidhash_segment, 0xff, 0x80);
    memset(msft->typelib_namehash_segment, 0xff, 0x200);

    set_lib_flags(msft);
    set_lcid(msft);
    set_help_file_name(msft);
    set_doc_string(msft);
    set_guid(msft);
    set_version(msft);
    set_name(msft);
    set_help_context(msft);
    set_help_string_dll(msft);
    set_help_string_context(msft);
    
    /* midl adds two sets of custom data to the library: the current unix time
       and midl's version number */
    cur_time = time(NULL);
    set_custdata(msft, &midl_time_guid, VT_UI4, &cur_time, &msft->typelib_header.CustomDataOffset);
    set_custdata(msft, &midl_version_guid, VT_UI4, &version, &msft->typelib_header.CustomDataOffset);

    LIST_FOR_EACH_ENTRY( entry, &typelib->entries, typelib_entry_t, entry )
        add_entry(msft, entry);

    save_all_changes(msft);
    free(msft);
    return 1;
}