dlls/itss/chm_lib.h

   1 /***************************************************************************
   2  *             chm_lib.h - CHM archive manipulation routines               *
   3  *                           -------------------                           *
   4  *                                                                         *
   5  *  author:     Jed Wing <jedwin@ugcs.caltech.edu>                         *
   6  *  version:    0.3                                                        *
   7  *  notes:      These routines are meant for the manipulation of microsoft *
   8  *              .chm (compiled html help) files, but may likely be used    *
   9  *              for the manipulation of any ITSS archive, if ever ITSS     *
  10  *              archives are used for any other purpose.                   *
  11  *                                                                         *
  12  *              Note also that the section names are statically handled.   *
  13  *              To be entirely correct, the section names should be read   *
  14  *              from the section names meta-file, and then the various     *
  15  *              content sections and the "transforms" to apply to the data *
  16  *              they contain should be inferred from the section name and  *
  17  *              the meta-files referenced using that name; however, all of *
  18  *              the files I've been able to get my hands on appear to have *
  19  *              only two sections: Uncompressed and MSCompressed.          *
  20  *              Additionally, the ITSS.DLL file included with Windows does *
  21  *              not appear to handle any different transforms than the     *
  22  *              simple LZX-transform.  Furthermore, the list of transforms *
  23  *              to apply is broken, in that only half the required space   *
  24  *              is allocated for the list.  (It appears as though the      *
  25  *              space is allocated for ASCII strings, but the strings are  *
  26  *              written as unicode.  As a result, only the first half of   *
  27  *              the string appears.)  So this is probably not too big of   *
  28  *              a deal, at least until CHM v4 (MS .lit files), which also  *
  29  *              incorporate encryption, of some description.               *
  30  ***************************************************************************/
  31
  32 /***************************************************************************
  33  *                                                                         *
  34  *   This library is free software; you can redistribute it and/or modify  *
  35  *   it under the terms of the GNU Lesser General Public License as        *
  36  *   published by the Free Software Foundation; either version 2.1 of the  *
  37  *   License, or (at your option) any later version.                       *
  38  *                                                                         *
  39  ***************************************************************************/
  40
  41 #ifndef INCLUDED_CHMLIB_H
  42 #define INCLUDED_CHMLIB_H
  43
  44 typedef ULONGLONG LONGUINT64;
  45 typedef LONGLONG  LONGINT64;
  46
  47 /* the two available spaces in a CHM file                      */
  48 /* N.B.: The format supports arbitrarily many spaces, but only */
  49 /*       two appear to be used at present.                     */
  50 #define CHM_UNCOMPRESSED (0)
  51 #define CHM_COMPRESSED   (1)
  52
  53 /* structure representing an ITS (CHM) file stream             */
  54 struct chmFile;
  55
  56 /* structure representing an element from an ITS file stream   */
  57 #define CHM_MAX_PATHLEN  (256)
  58 struct chmUnitInfo
  59 {
  60     LONGUINT64         start;
  61     LONGUINT64         length;
  62     int                space;
  63     WCHAR              path[CHM_MAX_PATHLEN+1];
  64 };
  65
  66 struct chmFile* chm_openW(const WCHAR *filename);
  67
  68 /* close an ITS archive */
  69 void chm_close(struct chmFile *h);
  70
  71 /* resolve a particular object from the archive */
  72 #define CHM_RESOLVE_SUCCESS (0)
  73 #define CHM_RESOLVE_FAILURE (1)
  74 int chm_resolve_object(struct chmFile *h,
  75                        const WCHAR *objPath,
  76                        struct chmUnitInfo *ui);
  77
  78 /* retrieve part of an object from the archive */
  79 LONGINT64 chm_retrieve_object(struct chmFile *h,
  80                               struct chmUnitInfo *ui,
  81                               unsigned char *buf,
  82                               LONGUINT64 addr,
  83                               LONGINT64 len);
  84
  85 /* enumerate the objects in the .chm archive */
  86 typedef int (*CHM_ENUMERATOR)(struct chmFile *h,
  87                               struct chmUnitInfo *ui,
  88                               void *context);
  89 #define CHM_ENUMERATE_NORMAL    (1)
  90 #define CHM_ENUMERATE_META      (2)
  91 #define CHM_ENUMERATE_SPECIAL   (4)
  92 #define CHM_ENUMERATE_FILES     (8)
  93 #define CHM_ENUMERATE_DIRS      (16)
  94 #define CHM_ENUMERATE_ALL       (31)
  95 #define CHM_ENUMERATOR_FAILURE  (0)
  96 #define CHM_ENUMERATOR_CONTINUE (1)
  97 #define CHM_ENUMERATOR_SUCCESS  (2)
  98 int chm_enumerate(struct chmFile *h,
  99                   int what,
 100                   CHM_ENUMERATOR e,
 101                   void *context);
 102
 103 int chm_enumerate_dir(struct chmFile *h,
 104                       const WCHAR *prefix,
 105                       int what,
 106                       CHM_ENUMERATOR e,
 107                       void *context);
 108
 109 #endif /* INCLUDED_CHMLIB_H */