2007-04-06 Andreas Faerber <andreas.faerber@web.de>

[mono.git] / mono / metadata / image.c

/*
 * image.c: Routines for manipulating an image stored in an
 * extended PE/COFF file.
 * 
 * Authors:
 *   Miguel de Icaza (miguel@ximian.com)
 *   Paolo Molaro (lupus@ximian.com)
 *
 * (C) 2001-2003 Ximian, Inc.  http://www.ximian.com
 *
 */
#include <config.h>
#include <stdio.h>
#include <glib.h>
#include <errno.h>
#include <time.h>
#include <string.h>
#include "image.h"
#include "cil-coff.h"
#include "rawbuffer.h"
#include "mono-endian.h"
#include "tabledefs.h"
#include "tokentype.h"
#include "metadata-internals.h"
#include "loader.h"
#include <mono/io-layer/io-layer.h>
#include <mono/utils/mono-logger.h>
#include <mono/utils/mono-path.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#define INVALID_ADDRESS 0xffffffff

/*
 * Keeps track of the various assemblies loaded
 */
static GHashTable *loaded_images_hash;
static GHashTable *loaded_images_guid_hash;
static GHashTable *loaded_images_refonly_hash;
static GHashTable *loaded_images_refonly_guid_hash;

static gboolean debug_assembly_unload = FALSE;

#define mono_images_lock() EnterCriticalSection (&images_mutex)
#define mono_images_unlock() LeaveCriticalSection (&images_mutex)
static CRITICAL_SECTION images_mutex;

guint32
mono_cli_rva_image_map (MonoCLIImageInfo *iinfo, guint32 addr)
{
        const int top = iinfo->cli_section_count;
        MonoSectionTable *tables = iinfo->cli_section_tables;
        int i;
        
        for (i = 0; i < top; i++){
                if ((addr >= tables->st_virtual_address) &&
                    (addr < tables->st_virtual_address + tables->st_raw_data_size)){
                        return addr - tables->st_virtual_address + tables->st_raw_data_ptr;
                }
                tables++;
        }
        return INVALID_ADDRESS;
}

/**
 * mono_images_rva_map:
 * @image: a MonoImage
 * @addr: relative virtual address (RVA)
 *
 * This is a low-level routine used by the runtime to map relative
 * virtual address (RVA) into their location in memory. 
 *
 * Returns: the address in memory for the given RVA, or NULL if the
 * RVA is not valid for this image. 
 */
char *
mono_image_rva_map (MonoImage *image, guint32 addr)
{
        MonoCLIImageInfo *iinfo = image->image_info;
        const int top = iinfo->cli_section_count;
        MonoSectionTable *tables = iinfo->cli_section_tables;
        int i;
        
        for (i = 0; i < top; i++){
                if ((addr >= tables->st_virtual_address) &&
                    (addr < tables->st_virtual_address + tables->st_raw_data_size)){
                        if (!iinfo->cli_sections [i]) {
                                if (!mono_image_ensure_section_idx (image, i))
                                        return NULL;
                        }
                        return (char*)iinfo->cli_sections [i] +
                                (addr - tables->st_virtual_address);
                }
                tables++;
        }
        return NULL;
}

/**
 * mono_images_init:
 *
 *  Initialize the global variables used by this module.
 */
void
mono_images_init (void)
{
        InitializeCriticalSection (&images_mutex);

        loaded_images_hash = g_hash_table_new (g_str_hash, g_str_equal);
        loaded_images_guid_hash = g_hash_table_new (g_str_hash, g_str_equal);
        loaded_images_refonly_hash = g_hash_table_new (g_str_hash, g_str_equal);
        loaded_images_refonly_guid_hash = g_hash_table_new (g_str_hash, g_str_equal);

        debug_assembly_unload = getenv ("MONO_DEBUG_ASSEMBLY_UNLOAD") != NULL;
}

/**
 * mono_images_cleanup:
 *
 *  Free all resources used by this module.
 */
void
mono_images_cleanup (void)
{
        DeleteCriticalSection (&images_mutex);

        g_hash_table_destroy (loaded_images_hash);
        g_hash_table_destroy (loaded_images_guid_hash);
        g_hash_table_destroy (loaded_images_refonly_hash);
        g_hash_table_destroy (loaded_images_refonly_guid_hash);
}

/**
 * mono_image_ensure_section_idx:
 * @image: The image we are operating on
 * @section: section number that we will load/map into memory
 *
 * This routine makes sure that we have an in-memory copy of
 * an image section (.text, .rsrc, .data).
 *
 * Returns: TRUE on success
 */
int
mono_image_ensure_section_idx (MonoImage *image, int section)
{
        MonoCLIImageInfo *iinfo = image->image_info;
        MonoSectionTable *sect;
        gboolean writable;
        
        g_return_val_if_fail (section < iinfo->cli_section_count, FALSE);

        if (iinfo->cli_sections [section] != NULL)
                return TRUE;

        sect = &iinfo->cli_section_tables [section];
        
        writable = sect->st_flags & SECT_FLAGS_MEM_WRITE;

        if (sect->st_raw_data_ptr + sect->st_raw_data_size > image->raw_data_len)
                return FALSE;
        /* FIXME: we ignore the writable flag since we don't patch the binary */
        iinfo->cli_sections [section] = image->raw_data + sect->st_raw_data_ptr;
        return TRUE;
}

/**
 * mono_image_ensure_section:
 * @image: The image we are operating on
 * @section: section name that we will load/map into memory
 *
 * This routine makes sure that we have an in-memory copy of
 * an image section (.text, .rsrc, .data).
 *
 * Returns: TRUE on success
 */
int
mono_image_ensure_section (MonoImage *image, const char *section)
{
        MonoCLIImageInfo *ii = image->image_info;
        int i;
        
        for (i = 0; i < ii->cli_section_count; i++){
                if (strncmp (ii->cli_section_tables [i].st_name, section, 8) != 0)
                        continue;
                
                return mono_image_ensure_section_idx (image, i);
        }
        return FALSE;
}

static int
load_section_tables (MonoImage *image, MonoCLIImageInfo *iinfo, guint32 offset)
{
        const int top = iinfo->cli_header.coff.coff_sections;
        int i;

        iinfo->cli_section_count = top;
        iinfo->cli_section_tables = g_new0 (MonoSectionTable, top);
        iinfo->cli_sections = g_new0 (void *, top);
        
        for (i = 0; i < top; i++){
                MonoSectionTable *t = &iinfo->cli_section_tables [i];

                if (offset + sizeof (MonoSectionTable) > image->raw_data_len)
                        return FALSE;
                memcpy (t, image->raw_data + offset, sizeof (MonoSectionTable));
                offset += sizeof (MonoSectionTable);

#if G_BYTE_ORDER != G_LITTLE_ENDIAN
                t->st_virtual_size = GUINT32_FROM_LE (t->st_virtual_size);
                t->st_virtual_address = GUINT32_FROM_LE (t->st_virtual_address);
                t->st_raw_data_size = GUINT32_FROM_LE (t->st_raw_data_size);
                t->st_raw_data_ptr = GUINT32_FROM_LE (t->st_raw_data_ptr);
                t->st_reloc_ptr = GUINT32_FROM_LE (t->st_reloc_ptr);
                t->st_lineno_ptr = GUINT32_FROM_LE (t->st_lineno_ptr);
                t->st_reloc_count = GUINT16_FROM_LE (t->st_reloc_count);
                t->st_line_count = GUINT16_FROM_LE (t->st_line_count);
                t->st_flags = GUINT32_FROM_LE (t->st_flags);
#endif
                /* consistency checks here */
        }

        return TRUE;
}

static gboolean
load_cli_header (MonoImage *image, MonoCLIImageInfo *iinfo)
{
        guint32 offset;
        
        offset = mono_cli_rva_image_map (iinfo, iinfo->cli_header.datadir.pe_cli_header.rva);
        if (offset == INVALID_ADDRESS)
                return FALSE;

        if (offset + sizeof (MonoCLIHeader) > image->raw_data_len)
                return FALSE;
        memcpy (&iinfo->cli_cli_header, image->raw_data + offset, sizeof (MonoCLIHeader));

#if G_BYTE_ORDER != G_LITTLE_ENDIAN
#define SWAP32(x) (x) = GUINT32_FROM_LE ((x))
#define SWAP16(x) (x) = GUINT16_FROM_LE ((x))
#define SWAPPDE(x) do { (x).rva = GUINT32_FROM_LE ((x).rva); (x).size = GUINT32_FROM_LE ((x).size);} while (0)
        SWAP32 (iinfo->cli_cli_header.ch_size);
        SWAP32 (iinfo->cli_cli_header.ch_flags);
        SWAP32 (iinfo->cli_cli_header.ch_entry_point);
        SWAP16 (iinfo->cli_cli_header.ch_runtime_major);
        SWAP16 (iinfo->cli_cli_header.ch_runtime_minor);
        SWAPPDE (iinfo->cli_cli_header.ch_metadata);
        SWAPPDE (iinfo->cli_cli_header.ch_resources);
        SWAPPDE (iinfo->cli_cli_header.ch_strong_name);
        SWAPPDE (iinfo->cli_cli_header.ch_code_manager_table);
        SWAPPDE (iinfo->cli_cli_header.ch_vtable_fixups);
        SWAPPDE (iinfo->cli_cli_header.ch_export_address_table_jumps);
        SWAPPDE (iinfo->cli_cli_header.ch_eeinfo_table);
        SWAPPDE (iinfo->cli_cli_header.ch_helper_table);
        SWAPPDE (iinfo->cli_cli_header.ch_dynamic_info);
        SWAPPDE (iinfo->cli_cli_header.ch_delay_load_info);
        SWAPPDE (iinfo->cli_cli_header.ch_module_image);
        SWAPPDE (iinfo->cli_cli_header.ch_external_fixups);
        SWAPPDE (iinfo->cli_cli_header.ch_ridmap);
        SWAPPDE (iinfo->cli_cli_header.ch_debug_map);
        SWAPPDE (iinfo->cli_cli_header.ch_ip_map);
#undef SWAP32
#undef SWAP16
#undef SWAPPDE
#endif
        /* Catch new uses of the fields that are supposed to be zero */

        if ((iinfo->cli_cli_header.ch_eeinfo_table.rva != 0) ||
            (iinfo->cli_cli_header.ch_helper_table.rva != 0) ||
            (iinfo->cli_cli_header.ch_dynamic_info.rva != 0) ||
            (iinfo->cli_cli_header.ch_delay_load_info.rva != 0) ||
            (iinfo->cli_cli_header.ch_module_image.rva != 0) ||
            (iinfo->cli_cli_header.ch_external_fixups.rva != 0) ||
            (iinfo->cli_cli_header.ch_ridmap.rva != 0) ||
            (iinfo->cli_cli_header.ch_debug_map.rva != 0) ||
            (iinfo->cli_cli_header.ch_ip_map.rva != 0)){

                /*
                 * No need to scare people who are testing this, I am just
                 * labelling this as a LAMESPEC
                 */
                /* g_warning ("Some fields in the CLI header which should have been zero are not zero"); */

        }
            
        return TRUE;
}

static gboolean
load_metadata_ptrs (MonoImage *image, MonoCLIImageInfo *iinfo)
{
        guint32 offset, size;
        guint16 streams;
        int i;
        guint32 pad;
        char *ptr;
        
        offset = mono_cli_rva_image_map (iinfo, iinfo->cli_cli_header.ch_metadata.rva);
        if (offset == INVALID_ADDRESS)
                return FALSE;

        size = iinfo->cli_cli_header.ch_metadata.size;

        if (offset + size > image->raw_data_len)
                return FALSE;
        image->raw_metadata = image->raw_data + offset;

        ptr = image->raw_metadata;

        if (strncmp (ptr, "BSJB", 4) == 0){
                guint32 version_string_len;

                ptr += 4;
                image->md_version_major = read16 (ptr);
                ptr += 4;
                image->md_version_minor = read16 (ptr);
                ptr += 4;

                version_string_len = read32 (ptr);
                ptr += 4;
                image->version = g_strndup (ptr, version_string_len);
                ptr += version_string_len;
                pad = ptr - image->raw_metadata;
                if (pad % 4)
                        ptr += 4 - (pad % 4);
        } else
                return FALSE;

        /* skip over flags */
        ptr += 2;
        
        streams = read16 (ptr);
        ptr += 2;

        for (i = 0; i < streams; i++){
                if (strncmp (ptr + 8, "#~", 3) == 0){
                        image->heap_tables.data = image->raw_metadata + read32 (ptr);
                        image->heap_tables.size = read32 (ptr + 4);
                        ptr += 8 + 3;
                } else if (strncmp (ptr + 8, "#Strings", 9) == 0){
                        image->heap_strings.data = image->raw_metadata + read32 (ptr);
                        image->heap_strings.size = read32 (ptr + 4);
                        ptr += 8 + 9;
                } else if (strncmp (ptr + 8, "#US", 4) == 0){
                        image->heap_us.data = image->raw_metadata + read32 (ptr);
                        image->heap_us.size = read32 (ptr + 4);
                        ptr += 8 + 4;
                } else if (strncmp (ptr + 8, "#Blob", 6) == 0){
                        image->heap_blob.data = image->raw_metadata + read32 (ptr);
                        image->heap_blob.size = read32 (ptr + 4);
                        ptr += 8 + 6;
                } else if (strncmp (ptr + 8, "#GUID", 6) == 0){
                        image->heap_guid.data = image->raw_metadata + read32 (ptr);
                        image->heap_guid.size = read32 (ptr + 4);
                        ptr += 8 + 6;
                } else if (strncmp (ptr + 8, "#-", 3) == 0) {
                        image->heap_tables.data = image->raw_metadata + read32 (ptr);
                        image->heap_tables.size = read32 (ptr + 4);
                        ptr += 8 + 3;
                        image->uncompressed_metadata = TRUE;
                        mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY, "Assembly '%s' has the non-standard metadata heap #-.\nRecompile it correctly (without the /incremental switch or in Release mode).\n", image->name);
                } else {
                        g_message ("Unknown heap type: %s\n", ptr + 8);
                        ptr += 8 + strlen (ptr + 8) + 1;
                }
                pad = ptr - image->raw_metadata;
                if (pad % 4)
                        ptr += 4 - (pad % 4);
        }

        g_assert (image->heap_guid.data);
        g_assert (image->heap_guid.size >= 16);

        image->guid = mono_guid_to_string ((guint8*)image->heap_guid.data);

        return TRUE;
}

/*
 * Load representation of logical metadata tables, from the "#~" stream
 */
static gboolean
load_tables (MonoImage *image)
{
        const char *heap_tables = image->heap_tables.data;
        const guint32 *rows;
        guint64 valid_mask, sorted_mask;
        int valid = 0, table;
        int heap_sizes;
        
        heap_sizes = heap_tables [6];
        image->idx_string_wide = ((heap_sizes & 0x01) == 1);
        image->idx_guid_wide   = ((heap_sizes & 0x02) == 2);
        image->idx_blob_wide   = ((heap_sizes & 0x04) == 4);
        
        valid_mask = read64 (heap_tables + 8);
        sorted_mask = read64 (heap_tables + 16);
        rows = (const guint32 *) (heap_tables + 24);
        
        for (table = 0; table < 64; table++){
                if ((valid_mask & ((guint64) 1 << table)) == 0){
                        if (table > MONO_TABLE_LAST)
                                continue;
                        image->tables [table].rows = 0;
                        continue;
                }
                if (table > MONO_TABLE_LAST) {
                        g_warning("bits in valid must be zero above 0x2d (II - 23.1.6)");
                } else {
                        image->tables [table].rows = read32 (rows);
                }
                /*if ((sorted_mask & ((guint64) 1 << table)) == 0){
                        g_print ("table %s (0x%02x) is sorted\n", mono_meta_table_name (table), table);
                }*/
                rows++;
                valid++;
        }

        image->tables_base = (heap_tables + 24) + (4 * valid);

        /* They must be the same */
        g_assert ((const void *) image->tables_base == (const void *) rows);

        mono_metadata_compute_table_bases (image);
        return TRUE;
}

static gboolean
load_metadata (MonoImage *image, MonoCLIImageInfo *iinfo)
{
        if (!load_metadata_ptrs (image, iinfo))
                return FALSE;

        return load_tables (image);
}

void
mono_image_check_for_module_cctor (MonoImage *image)
{
        MonoTableInfo *t, *mt;
        t = &image->tables [MONO_TABLE_TYPEDEF];
        mt = &image->tables [MONO_TABLE_METHOD];
        if (mono_get_runtime_info ()->framework_version [0] == '1') {
                image->checked_module_cctor = TRUE;
                return;
        }
        if (t->rows >= 1) {
                guint32 nameidx = mono_metadata_decode_row_col (t, 0, MONO_TYPEDEF_NAME);
                const char *name = mono_metadata_string_heap (image, nameidx);
                if (strcmp (name, "<Module>") == 0) {
                        guint32 first_method = mono_metadata_decode_row_col (t, 0, MONO_TYPEDEF_METHOD_LIST) - 1;
                        guint32 last_method;
                        if (t->rows > 1)
                                last_method = mono_metadata_decode_row_col (t, 1, MONO_TYPEDEF_METHOD_LIST) - 1;
                        else 
                                last_method = mt->rows;
                        for (; first_method < last_method; first_method++) {
                                nameidx = mono_metadata_decode_row_col (mt, first_method, MONO_METHOD_NAME);
                                name = mono_metadata_string_heap (image, nameidx);
                                if (strcmp (name, ".cctor") == 0) {
                                        image->has_module_cctor = TRUE;
                                        image->checked_module_cctor = TRUE;
                                        return;
                                }
                        }
                }
        }
        image->has_module_cctor = FALSE;
        image->checked_module_cctor = TRUE;
}

static void
load_modules (MonoImage *image, MonoImageOpenStatus *status)
{
        MonoTableInfo *t;
        MonoTableInfo *file_table;
        int i;
        char *base_dir;
        gboolean refonly = image->ref_only;
        GList *list_iter, *valid_modules = NULL;

        if (image->modules)
                return;

        file_table = &image->tables [MONO_TABLE_FILE];
        for (i = 0; i < file_table->rows; i++) {
                guint32 cols [MONO_FILE_SIZE];
                mono_metadata_decode_row (file_table, i, cols, MONO_FILE_SIZE);
                if (cols [MONO_FILE_FLAGS] == FILE_CONTAINS_NO_METADATA)
                        continue;
                valid_modules = g_list_prepend (valid_modules, (char*)mono_metadata_string_heap (image, cols [MONO_FILE_NAME]));
        }

        t = &image->tables [MONO_TABLE_MODULEREF];
        image->modules = g_new0 (MonoImage *, t->rows);
        image->module_count = t->rows;
        base_dir = g_path_get_dirname (image->name);
        for (i = 0; i < t->rows; i++){
                char *module_ref;
                const char *name;
                guint32 cols [MONO_MODULEREF_SIZE];
                /* if there is no file table, we try to load the module... */
                int valid = file_table->rows == 0;

                mono_metadata_decode_row (t, i, cols, MONO_MODULEREF_SIZE);
                name = mono_metadata_string_heap (image, cols [MONO_MODULEREF_NAME]);
                for (list_iter = valid_modules; list_iter; list_iter = list_iter->next) {
                        /* be safe with string dups, but we could just compare string indexes  */
                        if (strcmp (list_iter->data, name) == 0) {
                                valid = TRUE;
                                break;
                        }
                }
                if (!valid)
                        continue;
                module_ref = g_build_filename (base_dir, name, NULL);
                image->modules [i] = mono_image_open_full (module_ref, status, refonly);
                if (image->modules [i]) {
                        mono_image_addref (image->modules [i]);
                        /* g_print ("loaded module %s from %s (%p)\n", module_ref, image->name, image->assembly); */
                }
                /* 
                 * FIXME: We should probably do lazy-loading of modules.
                 */
                if (status)
                        *status = MONO_IMAGE_OK;
                g_free (module_ref);
        }

        g_free (base_dir);
        g_list_free (valid_modules);
}

static void
register_guid (gpointer key, gpointer value, gpointer user_data)
{
        MonoImage *image = (MonoImage*)value;

        if (!g_hash_table_lookup (loaded_images_guid_hash, image))
                g_hash_table_insert (loaded_images_guid_hash, image->guid, image);
}

static void
build_guid_table (gboolean refonly)
{
        GHashTable *loaded_images = refonly ? loaded_images_refonly_hash : loaded_images_hash;
        g_hash_table_foreach (loaded_images, register_guid, NULL);
}

void
mono_image_init (MonoImage *image)
{
        image->mempool = mono_mempool_new ();
        image->method_cache = g_hash_table_new (NULL, NULL);
        image->class_cache = g_hash_table_new (NULL, NULL);
        image->field_cache = g_hash_table_new (NULL, NULL);

        image->delegate_begin_invoke_cache = 
                g_hash_table_new ((GHashFunc)mono_signature_hash, 
                                  (GCompareFunc)mono_metadata_signature_equal);
        image->delegate_end_invoke_cache = 
                g_hash_table_new ((GHashFunc)mono_signature_hash, 
                                  (GCompareFunc)mono_metadata_signature_equal);
        image->delegate_invoke_cache = 
                g_hash_table_new ((GHashFunc)mono_signature_hash, 
                                  (GCompareFunc)mono_metadata_signature_equal);
        image->runtime_invoke_cache  = 
                g_hash_table_new ((GHashFunc)mono_signature_hash, 
                                  (GCompareFunc)mono_metadata_signature_equal);
        
        image->managed_wrapper_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->native_wrapper_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->remoting_invoke_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->cominterop_invoke_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->cominterop_wrapper_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->synchronized_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->unbox_wrapper_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);

        image->ldfld_wrapper_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->ldflda_wrapper_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->ldfld_remote_wrapper_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->stfld_wrapper_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->stfld_remote_wrapper_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->isinst_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->castclass_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);
        image->proxy_isinst_cache = g_hash_table_new (mono_aligned_addr_hash, NULL);

        image->typespec_cache = g_hash_table_new (NULL, NULL);
        image->memberref_signatures = g_hash_table_new (NULL, NULL);
        image->helper_signatures = g_hash_table_new (g_str_hash, g_str_equal);
        image->method_signatures = g_hash_table_new (NULL, NULL);
}

static MonoImage *
do_mono_image_load (MonoImage *image, MonoImageOpenStatus *status,
                    gboolean care_about_cli)
{
        MonoCLIImageInfo *iinfo;
        MonoDotNetHeader *header;
        MonoMSDOSHeader msdos;
        guint32 offset = 0;

        mono_image_init (image);

        iinfo = image->image_info;
        header = &iinfo->cli_header;
                
        if (status)
                *status = MONO_IMAGE_IMAGE_INVALID;

        if (offset + sizeof (msdos) > image->raw_data_len)
                goto invalid_image;
        memcpy (&msdos, image->raw_data + offset, sizeof (msdos));
        
        if (!(msdos.msdos_sig [0] == 'M' && msdos.msdos_sig [1] == 'Z'))
                goto invalid_image;
        
        msdos.pe_offset = GUINT32_FROM_LE (msdos.pe_offset);

        offset = msdos.pe_offset;

        if (offset + sizeof (MonoDotNetHeader) > image->raw_data_len)
                goto invalid_image;
        memcpy (header, image->raw_data + offset, sizeof (MonoDotNetHeader));
        offset += sizeof (MonoDotNetHeader);

#if G_BYTE_ORDER != G_LITTLE_ENDIAN
#define SWAP32(x) (x) = GUINT32_FROM_LE ((x))
#define SWAP16(x) (x) = GUINT16_FROM_LE ((x))
#define SWAPPDE(x) do { (x).rva = GUINT32_FROM_LE ((x).rva); (x).size = GUINT32_FROM_LE ((x).size);} while (0)
        SWAP32 (header->coff.coff_time);
        SWAP32 (header->coff.coff_symptr);
        SWAP32 (header->coff.coff_symcount);
        SWAP16 (header->coff.coff_machine);
        SWAP16 (header->coff.coff_sections);
        SWAP16 (header->coff.coff_opt_header_size);
        SWAP16 (header->coff.coff_attributes);
        /* MonoPEHeader */
        SWAP32 (header->pe.pe_code_size);
        SWAP32 (header->pe.pe_data_size);
        SWAP32 (header->pe.pe_uninit_data_size);
        SWAP32 (header->pe.pe_rva_entry_point);
        SWAP32 (header->pe.pe_rva_code_base);
        SWAP32 (header->pe.pe_rva_data_base);
        SWAP16 (header->pe.pe_magic);

        /* MonoPEHeaderNT: not used yet */
        SWAP32  (header->nt.pe_image_base);     /* must be 0x400000 */
        SWAP32  (header->nt.pe_section_align);       /* must be 8192 */
        SWAP32  (header->nt.pe_file_alignment);      /* must be 512 or 4096 */
        SWAP16  (header->nt.pe_os_major);            /* must be 4 */
        SWAP16  (header->nt.pe_os_minor);            /* must be 0 */
        SWAP16  (header->nt.pe_user_major);
        SWAP16  (header->nt.pe_user_minor);
        SWAP16  (header->nt.pe_subsys_major);
        SWAP16  (header->nt.pe_subsys_minor);
        SWAP32  (header->nt.pe_reserved_1);
        SWAP32  (header->nt.pe_image_size);
        SWAP32  (header->nt.pe_header_size);
        SWAP32  (header->nt.pe_checksum);
        SWAP16  (header->nt.pe_subsys_required);
        SWAP16  (header->nt.pe_dll_flags);
        SWAP32  (header->nt.pe_stack_reserve);
        SWAP32  (header->nt.pe_stack_commit);
        SWAP32  (header->nt.pe_heap_reserve);
        SWAP32  (header->nt.pe_heap_commit);
        SWAP32  (header->nt.pe_loader_flags);
        SWAP32  (header->nt.pe_data_dir_count);

        /* MonoDotNetHeader: mostly unused */
        SWAPPDE (header->datadir.pe_export_table);
        SWAPPDE (header->datadir.pe_import_table);
        SWAPPDE (header->datadir.pe_resource_table);
        SWAPPDE (header->datadir.pe_exception_table);
        SWAPPDE (header->datadir.pe_certificate_table);
        SWAPPDE (header->datadir.pe_reloc_table);
        SWAPPDE (header->datadir.pe_debug);
        SWAPPDE (header->datadir.pe_copyright);
        SWAPPDE (header->datadir.pe_global_ptr);
        SWAPPDE (header->datadir.pe_tls_table);
        SWAPPDE (header->datadir.pe_load_config_table);
        SWAPPDE (header->datadir.pe_bound_import);
        SWAPPDE (header->datadir.pe_iat);
        SWAPPDE (header->datadir.pe_delay_import_desc);
        SWAPPDE (header->datadir.pe_cli_header);
        SWAPPDE (header->datadir.pe_reserved);

#undef SWAP32
#undef SWAP16
#undef SWAPPDE
#endif

        if (header->coff.coff_machine != 0x14c)
                goto invalid_image;

        if (header->coff.coff_opt_header_size != (sizeof (MonoDotNetHeader) - sizeof (MonoCOFFHeader) - 4))
                goto invalid_image;

        if (header->pesig[0] != 'P' || header->pesig[1] != 'E' || header->pe.pe_magic != 0x10B)
                goto invalid_image;

#if 0
        /*
         * The spec says that this field should contain 6.0, but Visual Studio includes a new compiler,
         * which produces binaries with 7.0.  From Sergey:
         *
         * The reason is that MSVC7 uses traditional compile/link
         * sequence for CIL executables, and VS.NET (and Framework
         * SDK) includes linker version 7, that puts 7.0 in this
         * field.  That's why it's currently not possible to load VC
         * binaries with Mono.  This field is pretty much meaningless
         * anyway (what linker?).
         */
        if (header->pe.pe_major != 6 || header->pe.pe_minor != 0)
                goto invalid_image;
#endif

        /*
         * FIXME: byte swap all addresses here for header.
         */
        
        if (!load_section_tables (image, iinfo, offset))
                goto invalid_image;
        
        if (care_about_cli == FALSE) {
                goto done;
        }
        
        /* Load the CLI header */
        if (!load_cli_header (image, iinfo))
                goto invalid_image;

        if (!load_metadata (image, iinfo))
                goto invalid_image;

        /* modules don't have an assembly table row */
        if (image->tables [MONO_TABLE_ASSEMBLY].rows)
                image->assembly_name = mono_metadata_string_heap (image, 
                        mono_metadata_decode_row_col (&image->tables [MONO_TABLE_ASSEMBLY],
                                        0, MONO_ASSEMBLY_NAME));

        image->module_name = mono_metadata_string_heap (image, 
                        mono_metadata_decode_row_col (&image->tables [MONO_TABLE_MODULE],
                                        0, MONO_MODULE_NAME));

        load_modules (image, status);

done:
        if (status)
                *status = MONO_IMAGE_OK;

        return image;

invalid_image:
        mono_image_close (image);
                return NULL;
}

static MonoImage *
do_mono_image_open (const char *fname, MonoImageOpenStatus *status,
                    gboolean care_about_cli, gboolean refonly)
{
        MonoCLIImageInfo *iinfo;
        MonoImage *image;
        FILE *filed;
        struct stat stat_buf;

        if ((filed = fopen (fname, "rb")) == NULL){
                if (status)
                        *status = MONO_IMAGE_ERROR_ERRNO;
                return NULL;
        }

        if (fstat (fileno (filed), &stat_buf)) {
                fclose (filed);
                if (status)
                        *status = MONO_IMAGE_ERROR_ERRNO;
                return NULL;
        }
        image = g_new0 (MonoImage, 1);
        image->file_descr = filed;
        image->raw_data_len = stat_buf.st_size;
        image->raw_data = mono_raw_buffer_load (fileno (filed), FALSE, 0, stat_buf.st_size);
        iinfo = g_new0 (MonoCLIImageInfo, 1);
        image->image_info = iinfo;
        image->name = mono_path_resolve_symlinks (fname);
        image->ref_only = refonly;
        image->ref_count = 1;

        return do_mono_image_load (image, status, care_about_cli);
}

MonoImage *
mono_image_loaded_full (const char *name, gboolean refonly)
{
        MonoImage *res;
        GHashTable *loaded_images = refonly ? loaded_images_refonly_hash : loaded_images_hash;
        
        mono_images_lock ();
        res = g_hash_table_lookup (loaded_images, name);
        mono_images_unlock ();
        return res;
}

/**
 * mono_image_loaded:
 * @name: name of the image to load
 *
 * This routine ensures that the given image is loaded.
 *
 * Returns: the loaded MonoImage, or NULL on failure.
 */
MonoImage *
mono_image_loaded (const char *name)
{
        return mono_image_loaded_full (name, FALSE);
}

MonoImage *
mono_image_loaded_by_guid_full (const char *guid, gboolean refonly)
{
        MonoImage *res;
        GHashTable *loaded_images = refonly ? loaded_images_refonly_guid_hash : loaded_images_guid_hash;

        mono_images_lock ();
        res = g_hash_table_lookup (loaded_images, guid);
        mono_images_unlock ();
        return res;
}

MonoImage *
mono_image_loaded_by_guid (const char *guid)
{
        return mono_image_loaded_by_guid_full (guid, FALSE);
}

static MonoImage *
register_image (MonoImage *image)
{
        MonoImage *image2;
        GHashTable *loaded_images = image->ref_only ? loaded_images_refonly_hash : loaded_images_hash;

        mono_images_lock ();
        image2 = g_hash_table_lookup (loaded_images, image->name);

        if (image2) {
                /* Somebody else beat us to it */
                mono_image_addref (image2);
                mono_images_unlock ();
                mono_image_close (image);
                return image2;
        }
        g_hash_table_insert (loaded_images, image->name, image);
        if (image->assembly_name && (g_hash_table_lookup (loaded_images, image->assembly_name) == NULL))
                g_hash_table_insert (loaded_images, (char *) image->assembly_name, image);      
        g_hash_table_insert (image->ref_only ? loaded_images_refonly_guid_hash : loaded_images_guid_hash, image->guid, image);
        mono_images_unlock ();

        return image;
}

MonoImage *
mono_image_open_from_data_full (char *data, guint32 data_len, gboolean need_copy, MonoImageOpenStatus *status, gboolean refonly)
{
        MonoCLIImageInfo *iinfo;
        MonoImage *image;
        char *datac;

        if (!data || !data_len) {
                if (status)
                        *status = MONO_IMAGE_IMAGE_INVALID;
                return NULL;
        }
        datac = data;
        if (need_copy) {
                datac = g_try_malloc (data_len);
                if (!datac) {
                        if (status)
                                *status = MONO_IMAGE_ERROR_ERRNO;
                        return NULL;
                }
                memcpy (datac, data, data_len);
        }

        image = g_new0 (MonoImage, 1);
        image->raw_data = datac;
        image->raw_data_len = data_len;
        image->raw_data_allocated = need_copy;
        image->name = g_strdup_printf ("data-%p", datac);
        iinfo = g_new0 (MonoCLIImageInfo, 1);
        image->image_info = iinfo;
        image->ref_only = refonly;

        image = do_mono_image_load (image, status, TRUE);
        if (image == NULL)
                return NULL;

        return register_image (image);
}

MonoImage *
mono_image_open_from_data (char *data, guint32 data_len, gboolean need_copy, MonoImageOpenStatus *status)
{
        return mono_image_open_from_data_full (data, data_len, need_copy, status, FALSE);
}

MonoImage *
mono_image_open_full (const char *fname, MonoImageOpenStatus *status, gboolean refonly)
{
        MonoImage *image;
        GHashTable *loaded_images;
        char *absfname;
        
        g_return_val_if_fail (fname != NULL, NULL);
        
        absfname = mono_path_canonicalize (fname);

        /*
         * The easiest solution would be to do all the loading inside the mutex,
         * but that would lead to scalability problems. So we let the loading
         * happen outside the mutex, and if multiple threads happen to load
         * the same image, we discard all but the first copy.
         */
        mono_images_lock ();
        loaded_images = refonly ? loaded_images_refonly_hash : loaded_images_hash;
        image = g_hash_table_lookup (loaded_images, absfname);
        g_free (absfname);
        
        if (image){
                mono_image_addref (image);
                mono_images_unlock ();
                return image;
        }
        mono_images_unlock ();

        image = do_mono_image_open (fname, status, TRUE, refonly);
        if (image == NULL)
                return NULL;

        return register_image (image);
}

/**
 * mono_image_open:
 * @fname: filename that points to the module we want to open
 * @status: An error condition is returned in this field
 *
 * Returns: An open image of type %MonoImage or NULL on error. 
 * The caller holds a temporary reference to the returned image which should be cleared 
 * when no longer needed by calling mono_image_close ().
 * if NULL, then check the value of @status for details on the error
 */
MonoImage *
mono_image_open (const char *fname, MonoImageOpenStatus *status)
{
        return mono_image_open_full (fname, status, FALSE);
}

/**
 * mono_pe_file_open:
 * @fname: filename that points to the module we want to open
 * @status: An error condition is returned in this field
 *
 * Returns: An open image of type %MonoImage or NULL on error.  if
 * NULL, then check the value of @status for details on the error.
 * This variant for mono_image_open DOES NOT SET UP CLI METADATA.
 * It's just a PE file loader, used for FileVersionInfo.  It also does
 * not use the image cache.
 */
MonoImage *
mono_pe_file_open (const char *fname, MonoImageOpenStatus *status)
{
        g_return_val_if_fail (fname != NULL, NULL);
        
        return(do_mono_image_open (fname, status, FALSE, FALSE));
}

static void
free_hash_table (gpointer key, gpointer val, gpointer user_data)
{
        g_hash_table_destroy ((GHashTable*)val);
}

/*
static void
free_mr_signatures (gpointer key, gpointer val, gpointer user_data)
{
        mono_metadata_free_method_signature ((MonoMethodSignature*)val);
}
*/

static void
free_blob_cache_entry (gpointer key, gpointer val, gpointer user_data)
{
        g_free (key);
}

static void
free_remoting_wrappers (gpointer key, gpointer val, gpointer user_data)
{
        g_free (val);
}

static void
free_array_cache_entry (gpointer key, gpointer val, gpointer user_data)
{
        g_slist_free ((GSList*)val);
}

/**
 * mono_image_addref:
 * @image: The image file we wish to add a reference to
 *
 *  Increases the reference count of an image.
 */
void
mono_image_addref (MonoImage *image)
{
        InterlockedIncrement (&image->ref_count);
}       

void
mono_dynamic_stream_reset (MonoDynamicStream* stream)
{
        stream->alloc_size = stream->index = stream->offset = 0;
        g_free (stream->data);
        stream->data = NULL;
        if (stream->hash) {
                g_hash_table_destroy (stream->hash);
                stream->hash = NULL;
        }
}

/**
 * mono_image_close:
 * @image: The image file we wish to close
 *
 * Closes an image file, deallocates all memory consumed and
 * unmaps all possible sections of the file
 */
void
mono_image_close (MonoImage *image)
{
        MonoImage *image2;
        GHashTable *loaded_images, *loaded_images_guid;
        int i;

        g_return_if_fail (image != NULL);

        if (InterlockedDecrement (&image->ref_count) > 0)
                return;

        mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY, "Unloading image %s [%p].", image->name, image);
        
        mono_images_lock ();
        loaded_images = image->ref_only ? loaded_images_refonly_hash : loaded_images_hash;
        loaded_images_guid = image->ref_only ? loaded_images_refonly_guid_hash : loaded_images_guid_hash;
        image2 = g_hash_table_lookup (loaded_images, image->name);
        if (image == image2) {
                /* This is not true if we are called from mono_image_open () */
                g_hash_table_remove (loaded_images, image->name);
                g_hash_table_remove (loaded_images_guid, image->guid);
        }
        if (image->assembly_name && (g_hash_table_lookup (loaded_images, image->assembly_name) == image))
                g_hash_table_remove (loaded_images, (char *) image->assembly_name);     

        /* Multiple images might have the same guid */
        build_guid_table (image->ref_only);

        mono_images_unlock ();

        if (image->file_descr) {
                fclose (image->file_descr);
                image->file_descr = NULL;
                if (image->raw_data != NULL)
                        mono_raw_buffer_free (image->raw_data);
        }
        
        if (image->raw_data_allocated) {
                /* image->raw_metadata and cli_sections might lie inside image->raw_data */
                MonoCLIImageInfo *ii = image->image_info;

                if ((image->raw_metadata > image->raw_data) &&
                        (image->raw_metadata <= (image->raw_data + image->raw_data_len)))
                        image->raw_metadata = NULL;

                for (i = 0; i < ii->cli_section_count; i++)
                        if (((char*)(ii->cli_sections [i]) > image->raw_data) &&
                                ((char*)(ii->cli_sections [i]) <= ((char*)image->raw_data + image->raw_data_len)))
                                ii->cli_sections [i] = NULL;

                g_free (image->raw_data);
        }

        if (debug_assembly_unload) {
                image->name = g_strdup_printf ("%s - UNLOADED", image->name);
        } else {
                g_free (image->name);
                g_free (image->guid);
                g_free (image->version);
                g_free (image->files);
        }

        g_hash_table_destroy (image->method_cache);
        g_hash_table_destroy (image->class_cache);
        g_hash_table_destroy (image->field_cache);
        if (image->array_cache) {
                g_hash_table_foreach (image->array_cache, free_array_cache_entry, NULL);
                g_hash_table_destroy (image->array_cache);
        }
        if (image->ptr_cache)
                g_hash_table_destroy (image->ptr_cache);
        if (image->name_cache) {
                g_hash_table_foreach (image->name_cache, free_hash_table, NULL);
                g_hash_table_destroy (image->name_cache);
        }
        g_hash_table_destroy (image->native_wrapper_cache);
        g_hash_table_destroy (image->managed_wrapper_cache);
        g_hash_table_destroy (image->delegate_begin_invoke_cache);
        g_hash_table_destroy (image->delegate_end_invoke_cache);
        g_hash_table_destroy (image->delegate_invoke_cache);
        g_hash_table_foreach (image->remoting_invoke_cache, free_remoting_wrappers, NULL);
        g_hash_table_destroy (image->remoting_invoke_cache);
        g_hash_table_destroy (image->runtime_invoke_cache);
        g_hash_table_destroy (image->synchronized_cache);
        g_hash_table_destroy (image->unbox_wrapper_cache);
        g_hash_table_destroy (image->cominterop_invoke_cache);
        g_hash_table_destroy (image->cominterop_wrapper_cache);
        g_hash_table_destroy (image->typespec_cache);
        g_hash_table_destroy (image->ldfld_wrapper_cache);
        g_hash_table_destroy (image->ldflda_wrapper_cache);
        g_hash_table_destroy (image->ldfld_remote_wrapper_cache);
        g_hash_table_destroy (image->stfld_wrapper_cache);
        g_hash_table_destroy (image->stfld_remote_wrapper_cache);
        g_hash_table_destroy (image->isinst_cache);
        g_hash_table_destroy (image->castclass_cache);
        g_hash_table_destroy (image->proxy_isinst_cache);

        /* The ownership of signatures is not well defined */
        //g_hash_table_foreach (image->memberref_signatures, free_mr_signatures, NULL);
        g_hash_table_destroy (image->memberref_signatures);
        //g_hash_table_foreach (image->helper_signatures, free_mr_signatures, NULL);
        g_hash_table_destroy (image->helper_signatures);
        g_hash_table_destroy (image->method_signatures);

        if (image->interface_bitset) {
                mono_unload_interface_ids (image->interface_bitset);
                mono_bitset_free (image->interface_bitset);
        }
        if (image->image_info){
                MonoCLIImageInfo *ii = image->image_info;

                if (ii->cli_section_tables)
                        g_free (ii->cli_section_tables);
                if (ii->cli_sections)
                        g_free (ii->cli_sections);
                g_free (image->image_info);
        }

        for (i = 0; i < image->module_count; ++i) {
                if (image->modules [i])
                        mono_image_close (image->modules [i]);
        }
        if (image->modules)
                g_free (image->modules);
        if (image->references)
                g_free (image->references);
        /*g_print ("destroy image %p (dynamic: %d)\n", image, image->dynamic);*/
        if (!image->dynamic) {
                if (debug_assembly_unload)
                        mono_mempool_invalidate (image->mempool);
                else {
                        mono_mempool_destroy (image->mempool);
                        g_free (image);
                }
        } else {
                /* Dynamic images are GC_MALLOCed */
                struct _MonoDynamicImage *di = (struct _MonoDynamicImage*)image;
                int i;
                g_free ((char*)image->module_name);
                if (di->typespec)
                        g_hash_table_destroy (di->typespec);
                if (di->typeref)
                        g_hash_table_destroy (di->typeref);
                if (di->handleref)
                        g_hash_table_destroy (di->handleref);
                if (di->tokens)
                        mono_g_hash_table_destroy (di->tokens);
                if (di->blob_cache) {
                        g_hash_table_foreach (di->blob_cache, free_blob_cache_entry, NULL);
                        g_hash_table_destroy (di->blob_cache);
                }
                g_list_free (di->array_methods);
                if (di->gen_params)
                        g_ptr_array_free (di->gen_params, TRUE);
                if (di->token_fixups)
                        mono_g_hash_table_destroy (di->token_fixups);
                if (di->method_to_table_idx)
                        g_hash_table_destroy (di->method_to_table_idx);
                if (di->field_to_table_idx)
                        g_hash_table_destroy (di->field_to_table_idx);
                if (di->method_aux_hash)
                        g_hash_table_destroy (di->method_aux_hash);
                g_free (di->strong_name);
                g_free (di->win32_res);
                /*g_print ("string heap destroy for image %p\n", di);*/
                mono_dynamic_stream_reset (&di->sheap);
                mono_dynamic_stream_reset (&di->code);
                mono_dynamic_stream_reset (&di->resources);
                mono_dynamic_stream_reset (&di->us);
                mono_dynamic_stream_reset (&di->blob);
                mono_dynamic_stream_reset (&di->tstream);
                mono_dynamic_stream_reset (&di->guid);
                for (i = 0; i < MONO_TABLE_NUM; ++i) {
                        g_free (di->tables [i].values);
                }
                mono_mempool_destroy (image->mempool);
        }
}

/** 
 * mono_image_strerror:
 * @status: an code indicating the result from a recent operation
 *
 * Returns: a string describing the error
 */
const char *
mono_image_strerror (MonoImageOpenStatus status)
{
        switch (status){
        case MONO_IMAGE_OK:
                return "success";
        case MONO_IMAGE_ERROR_ERRNO:
                return strerror (errno);
        case MONO_IMAGE_IMAGE_INVALID:
                return "File does not contain a valid CIL image";
        case MONO_IMAGE_MISSING_ASSEMBLYREF:
                return "An assembly was referenced, but could not be found";
        }
        return "Internal error";
}

static gpointer
mono_image_walk_resource_tree (MonoCLIImageInfo *info, guint32 res_id,
                               guint32 lang_id, gunichar2 *name,
                               MonoPEResourceDirEntry *entry,
                               MonoPEResourceDir *root, guint32 level)
{
        gboolean is_string, is_dir;
        guint32 name_offset, dir_offset;

        /* Level 0 holds a directory entry for each type of resource
         * (identified by ID or name).
         *
         * Level 1 holds a directory entry for each named resource
         * item, and each "anonymous" item of a particular type of
         * resource.
         *
         * Level 2 holds a directory entry for each language pointing to
         * the actual data.
         */
        name_offset = GUINT32_FROM_LE (entry->name_offset) & 0x7fffffff;
        dir_offset = GUINT32_FROM_LE (entry->dir_offset) & 0x7fffffff;

#if G_BYTE_ORDER != G_LITTLE_ENDIAN
        is_string = (GUINT32_FROM_LE (entry->name_offset) & 0x80000000) != 0;
        is_dir = (GUINT32_FROM_LE (entry->dir_offset) & 0x80000000) != 0;
#else
        is_string = entry->name_is_string;
        is_dir = entry->is_dir;
#endif

        if(level==0) {
                if((is_string==FALSE && name_offset!=res_id) ||
                   (is_string==TRUE)) {
                        return(NULL);
                }
        } else if (level==1) {
#if 0
                if(name!=NULL &&
                   is_string==TRUE && name!=lookup (name_offset)) {
                        return(NULL);
                }
#endif
        } else if (level==2) {
                if ((is_string == FALSE &&
                    name_offset != lang_id &&
                    lang_id != 0) ||
                   (is_string == TRUE)) {
                        return(NULL);
                }
        } else {
                g_assert_not_reached ();
        }

        if(is_dir==TRUE) {
                MonoPEResourceDir *res_dir=(MonoPEResourceDir *)(((char *)root)+dir_offset);
                MonoPEResourceDirEntry *sub_entries=(MonoPEResourceDirEntry *)(res_dir+1);
                guint32 entries, i;

                entries = GUINT16_FROM_LE (res_dir->res_named_entries) + GUINT16_FROM_LE (res_dir->res_id_entries);

                for(i=0; i<entries; i++) {
                        MonoPEResourceDirEntry *sub_entry=&sub_entries[i];
                        gpointer ret;
                        
                        ret=mono_image_walk_resource_tree (info, res_id,
                                                           lang_id, name,
                                                           sub_entry, root,
                                                           level+1);
                        if(ret!=NULL) {
                                return(ret);
                        }
                }

                return(NULL);
        } else {
                MonoPEResourceDataEntry *data_entry=(MonoPEResourceDataEntry *)((char *)(root)+dir_offset);
                MonoPEResourceDataEntry *res;

                res = g_new0 (MonoPEResourceDataEntry, 1);

                res->rde_data_offset = GUINT32_TO_LE (data_entry->rde_data_offset);
                res->rde_size = GUINT32_TO_LE (data_entry->rde_size);
                res->rde_codepage = GUINT32_TO_LE (data_entry->rde_codepage);
                res->rde_reserved = GUINT32_TO_LE (data_entry->rde_reserved);

                return (res);
        }
}

/**
 * mono_image_lookup_resource:
 * @image: the image to look up the resource in
 * @res_id: A MONO_PE_RESOURCE_ID_ that represents the resource ID to lookup.
 * @lang_id: The language id.
 * @name: the resource name to lookup.
 *
 * Returns: NULL if not found, otherwise a pointer to the in-memory representation
 * of the given resource. The caller should free it using g_free () when no longer
 * needed.
 */
gpointer
mono_image_lookup_resource (MonoImage *image, guint32 res_id, guint32 lang_id, gunichar2 *name)
{
        MonoCLIImageInfo *info;
        MonoDotNetHeader *header;
        MonoPEDatadir *datadir;
        MonoPEDirEntry *rsrc;
        MonoPEResourceDir *resource_dir;
        MonoPEResourceDirEntry *res_entries;
        guint32 entries, i;

        if(image==NULL) {
                return(NULL);
        }

        info=image->image_info;
        if(info==NULL) {
                return(NULL);
        }

        header=&info->cli_header;
        if(header==NULL) {
                return(NULL);
        }

        datadir=&header->datadir;
        if(datadir==NULL) {
                return(NULL);
        }

        rsrc=&datadir->pe_resource_table;
        if(rsrc==NULL) {
                return(NULL);
        }

        resource_dir=(MonoPEResourceDir *)mono_image_rva_map (image, rsrc->rva);
        if(resource_dir==NULL) {
                return(NULL);
        }

        entries = GUINT16_FROM_LE (resource_dir->res_named_entries) + GUINT16_FROM_LE (resource_dir->res_id_entries);
        res_entries=(MonoPEResourceDirEntry *)(resource_dir+1);
        
        for(i=0; i<entries; i++) {
                MonoPEResourceDirEntry *entry=&res_entries[i];
                gpointer ret;
                
                ret=mono_image_walk_resource_tree (info, res_id, lang_id,
                                                   name, entry, resource_dir,
                                                   0);
                if(ret!=NULL) {
                        return(ret);
                }
        }

        return(NULL);
}

/** 
 * mono_image_get_entry_point:
 * @image: the image where the entry point will be looked up.
 *
 * Use this routine to determine the metadata token for method that
 * has been flagged as the entry point.
 *
 * Returns: the token for the entry point method in the image
 */
guint32
mono_image_get_entry_point (MonoImage *image)
{
        return ((MonoCLIImageInfo*)image->image_info)->cli_cli_header.ch_entry_point;
}

/**
 * mono_image_get_resource:
 * @image: the image where the resource will be looked up.
 * @offset: The offset to add to the resource
 * @size: a pointer to an int where the size of the resource will be stored
 *
 * This is a low-level routine that fetches a resource from the
 * metadata that starts at a given @offset.  The @size parameter is
 * filled with the data field as encoded in the metadata.
 *
 * Returns: the pointer to the resource whose offset is @offset.
 */
const char*
mono_image_get_resource (MonoImage *image, guint32 offset, guint32 *size)
{
        MonoCLIImageInfo *iinfo = image->image_info;
        MonoCLIHeader *ch = &iinfo->cli_cli_header;
        const char* data;

        if (!ch->ch_resources.rva || offset + 4 > ch->ch_resources.size)
                return NULL;
        
        data = mono_image_rva_map (image, ch->ch_resources.rva);
        if (!data)
                return NULL;
        data += offset;
        if (size)
                *size = read32 (data);
        data += 4;
        return data;
}

MonoImage*
mono_image_load_file_for_image (MonoImage *image, int fileidx)
{
        char *base_dir, *name;
        MonoImage *res;
        MonoTableInfo  *t = &image->tables [MONO_TABLE_FILE];
        const char *fname;
        guint32 fname_id;

        if (fileidx < 1 || fileidx > t->rows)
                return NULL;

        if (image->files && image->files [fileidx - 1])
                return image->files [fileidx - 1];

        if (!image->files)
                image->files = g_new0 (MonoImage*, t->rows);

        fname_id = mono_metadata_decode_row_col (t, fileidx - 1, MONO_FILE_NAME);
        fname = mono_metadata_string_heap (image, fname_id);
        base_dir = g_path_get_dirname (image->name);
        name = g_build_filename (base_dir, fname, NULL);
        res = mono_image_open (name, NULL);
        if (res) {
                int i;
                /* g_print ("loaded file %s from %s (%p)\n", name, image->name, image->assembly); */
                res->assembly = image->assembly;
                for (i = 0; i < res->module_count; ++i) {
                        if (res->modules [i] && !res->modules [i]->assembly)
                                res->modules [i]->assembly = image->assembly;
                }

                image->files [fileidx - 1] = res;
        }
        g_free (name);
        g_free (base_dir);
        return res;
}

/**
 * mono_image_get_strong_name:
 * @image: a MonoImage
 * @size: a guint32 pointer, or NULL.
 *
 * If the image has a strong name, and @size is not NULL, the value
 * pointed to by size will have the size of the strong name.
 *
 * Returns: NULL if the image does not have a strong name, or a
 * pointer to the public key.
 */
const char*
mono_image_get_strong_name (MonoImage *image, guint32 *size)
{
        MonoCLIImageInfo *iinfo = image->image_info;
        MonoPEDirEntry *de = &iinfo->cli_cli_header.ch_strong_name;
        const char* data;

        if (!de->size || !de->rva)
                return NULL;
        data = mono_image_rva_map (image, de->rva);
        if (!data)
                return NULL;
        if (size)
                *size = de->size;
        return data;
}

/**
 * mono_image_strong_name_position:
 * @image: a MonoImage
 * @size: a guint32 pointer, or NULL.
 *
 * If the image has a strong name, and @size is not NULL, the value
 * pointed to by size will have the size of the strong name.
 *
 * Returns: the position within the image file where the strong name
 * is stored.
 */
guint32
mono_image_strong_name_position (MonoImage *image, guint32 *size)
{
        MonoCLIImageInfo *iinfo = image->image_info;
        MonoPEDirEntry *de = &iinfo->cli_cli_header.ch_strong_name;
        const int top = iinfo->cli_section_count;
        MonoSectionTable *tables = iinfo->cli_section_tables;
        int i;
        guint32 addr = de->rva;
        
        if (size)
                *size = de->size;
        if (!de->size || !de->rva)
                return 0;
        for (i = 0; i < top; i++){
                if ((addr >= tables->st_virtual_address) &&
                    (addr < tables->st_virtual_address + tables->st_raw_data_size)){
                        return tables->st_raw_data_ptr +
                                (addr - tables->st_virtual_address);
                }
                tables++;
        }

        return 0;
}

/**
 * mono_image_get_public_key:
 * @image: a MonoImage
 * @size: a guint32 pointer, or NULL.
 *
 * This is used to obtain the public key in the @image.
 * 
 * If the image has a public key, and @size is not NULL, the value
 * pointed to by size will have the size of the public key.
 * 
 * Returns: NULL if the image does not have a public key, or a pointer
 * to the public key.
 */
const char*
mono_image_get_public_key (MonoImage *image, guint32 *size)
{
        const char *pubkey;
        guint32 len, tok;
        if (image->tables [MONO_TABLE_ASSEMBLY].rows != 1)
                return NULL;
        tok = mono_metadata_decode_row_col (&image->tables [MONO_TABLE_ASSEMBLY], 0, MONO_ASSEMBLY_PUBLIC_KEY);
        if (!tok)
                return NULL;
        pubkey = mono_metadata_blob_heap (image, tok);
        len = mono_metadata_decode_blob_size (pubkey, &pubkey);
        if (size)
                *size = len;
        return pubkey;
}

/**
 * mono_image_get_name:
 * @name: a MonoImage
 *
 * Returns: the name of the assembly.
 */
const char*
mono_image_get_name (MonoImage *image)
{
        return image->assembly_name;
}

/**
 * mono_image_get_filename:
 * @image: a MonoImage
 *
 * Used to get the filename that hold the actual MonoImage
 *
 * Returns: the filename.
 */
const char*
mono_image_get_filename (MonoImage *image)
{
        return image->name;
}

const char*
mono_image_get_guid (MonoImage *image)
{
        return image->guid;
}

const MonoTableInfo*
mono_image_get_table_info (MonoImage *image, int table_id)
{
        if (table_id < 0 || table_id >= MONO_TABLE_NUM)
                return NULL;
        return &image->tables [table_id];
}

int
mono_image_get_table_rows (MonoImage *image, int table_id)
{
        if (table_id < 0 || table_id >= MONO_TABLE_NUM)
                return 0;
        return image->tables [table_id].rows;
}

int
mono_table_info_get_rows (const MonoTableInfo *table)
{
        return table->rows;
}

/**
 * mono_image_get_assembly:
 * @image: the MonoImage.
 *
 * Use this routine to get the assembly that owns this image.
 *
 * Returns: the assembly that holds this image.
 */
MonoAssembly* 
mono_image_get_assembly (MonoImage *image)
{
        return image->assembly;
}

/**
 * mono_image_is_dynamic:
 * @image: the MonoImage
 *
 * Determines if the given image was created dynamically through the
 * System.Reflection.Emit API
 *
 * Returns: TRUE if the image was created dynamically, FALSE if not.
 */
gboolean
mono_image_is_dynamic (MonoImage *image)
{
        return image->dynamic;
}

/**
 * mono_image_has_authenticode_entry:
 * @image: the MonoImage
 *
 * Use this routine to determine if the image has a Authenticode
 * Certificate Table.
 *
 * Returns: TRUE if the image contains an authenticode entry in the PE
 * directory.
 */
gboolean
mono_image_has_authenticode_entry (MonoImage *image)
{
        MonoCLIImageInfo *iinfo = image->image_info;
        MonoDotNetHeader *header = &iinfo->cli_header;
        MonoPEDirEntry *de = &header->datadir.pe_certificate_table;
        // the Authenticode "pre" (non ASN.1) header is 8 bytes long
        return ((de->rva != 0) && (de->size > 8));
}