dlls/avifil32/extrachunk.c

   1 /*
   2  * Copyright 2002 Michael Günnewig
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #define COM_NO_WINDOWS_H
  20 #include <assert.h>
  21
  22 #include "extrachunk.h"
  23 #include "winbase.h"
  24 #include "windowsx.h"
  25 #include "vfw.h"
  26
  27 #include "wine/debug.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(avifile);
  30
  31 /* reads a chunk outof the extrachunk-structure */
  32 HRESULT ReadExtraChunk(LPEXTRACHUNKS extra,FOURCC ckid,LPVOID lpData,
  33                        LPLONG size)
  34 {
  35   LPBYTE lp;
  36   LONG   cb;
  37
  38   /* pre-conditions */
  39   assert(extra != NULL);
  40   assert(size != NULL);
  41
  42   lp = extra->lp;
  43   cb = extra->cb;
  44
  45   if (lp != NULL) {
  46     while (cb > 0) {
  47       if (((FOURCC*)lp)[0] == ckid) {
  48         /* found correct chunk */
  49         if (lpData != NULL && *size > 0)
  50           memcpy(lpData, lp + 2 * sizeof(DWORD), min(((LPDWORD)lp)[1],*size));
  51
  52         *size = ((LPDWORD)lp)[1];
  53
  54         return AVIERR_OK;
  55       } else {
  56         /* skip to next chunk */
  57         cb -= ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
  58         lp += ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
  59       }
  60     }
  61   }
  62
  63   /* wanted chunk doesn't exist */
  64   *size = 0;
  65
  66   return AVIERR_NODATA;
  67 }
  68
  69 /* writes a chunk into the extrachunk-structure */
  70 HRESULT WriteExtraChunk(LPEXTRACHUNKS extra,FOURCC ckid,LPVOID lpData,
  71                         LONG size)
  72 {
  73   LPDWORD lp;
  74
  75   /* pre-conditions */
  76   assert(extra != NULL);
  77   assert(lpData != NULL);
  78   assert(size > 0);
  79
  80   if (extra->lp)
  81     lp = (LPDWORD)GlobalReAllocPtr(extra->lp, extra->cb + size + 2 * sizeof(DWORD), GHND);
  82   else
  83     lp = (LPDWORD)GlobalAllocPtr(GHND, size + 2 * sizeof(DWORD));
  84
  85   if (lp == NULL)
  86     return AVIERR_MEMORY;
  87
  88   extra->lp  = lp;
  89   ((LPBYTE)lp) += extra->cb;
  90   extra->cb += size + 2 * sizeof(DWORD);
  91
  92   /* insert chunk-header in block */
  93   lp[0] = ckid;
  94   lp[1] = size;
  95
  96   if (lpData != NULL && size > 0)
  97     memcpy(lp + 2, lpData, size);
  98
  99   return AVIERR_OK;
 100 }
 101
 102 /* reads a chunk fomr the HMMIO into the extrachunk-structure */
 103 HRESULT ReadChunkIntoExtra(LPEXTRACHUNKS extra,HMMIO hmmio,MMCKINFO *lpck)
 104 {
 105   LPDWORD lp;
 106   LONG    cb;
 107
 108   /* pre-conditions */
 109   assert(extra != NULL);
 110   assert(hmmio != NULL);
 111   assert(lpck  != NULL);
 112
 113   cb  = lpck->cksize + 2 * sizeof(DWORD);
 114   cb += (cb & 1);
 115
 116   if (extra->lp != NULL) {
 117     lp = (LPDWORD)GlobalReAllocPtr(extra->lp, extra->cb + cb, GHND);
 118   } else
 119     lp = (LPDWORD)GlobalAllocPtr(GHND, cb);
 120
 121   if (lp == NULL)
 122     return AVIERR_MEMORY;
 123
 124   extra->lp  = lp;
 125   ((LPBYTE)lp) += extra->cb;
 126   extra->cb += cb;
 127
 128   /* insert chunk-header in block */
 129   lp[0] = lpck->ckid;
 130   lp[1] = lpck->cksize;
 131
 132   if (lpck->cksize > 0) {
 133     if (mmioSeek(hmmio, lpck->dwDataOffset, SEEK_SET) == -1)
 134       return AVIERR_FILEREAD;
 135     if (mmioRead(hmmio, (HPSTR)&lp[2], lpck->cksize) != lpck->cksize)
 136       return AVIERR_FILEREAD;
 137   }
 138
 139   return AVIERR_OK;
 140 }
 141
 142 /* reads all non-junk chunks into the extrachunk-structure until it founds
 143  * the given chunk or the optional parent-chunk is at the end */
 144 HRESULT FindChunkAndKeepExtras(LPEXTRACHUNKS extra,HMMIO hmmio,MMCKINFO *lpck,
 145                                MMCKINFO *lpckParent,UINT flags)
 146 {
 147   FOURCC  ckid;
 148   FOURCC  fccType;
 149   HRESULT hr;
 150
 151   /* pre-conditions */
 152   assert(extra != NULL);
 153   assert(hmmio != NULL);
 154   assert(lpck  != NULL);
 155
 156   TRACE("({%p,%lu},%p,%p,%p,0x%X)\n", extra->lp, extra->cb, hmmio, lpck,
 157         lpckParent, flags);
 158
 159   /* what chunk id and form/list type shoiuld we search? */
 160   if (flags & MMIO_FINDCHUNK) {
 161     ckid    = lpck->ckid;
 162     fccType = 0;
 163   } else if (flags & MMIO_FINDLIST) {
 164     ckid    = FOURCC_LIST;
 165     fccType = lpck->fccType;
 166   } else if (flags & MMIO_FINDRIFF) {
 167     ckid    = FOURCC_RIFF;
 168     fccType = lpck->fccType;
 169   } else
 170     ckid = fccType = (FOURCC)-1; /* collect everything into extra! */
 171
 172   TRACE(": find ckid=0x%08lX fccType=0x%08lX\n", ckid, fccType);
 173
 174   for (;;) {
 175     hr = mmioDescend(hmmio, lpck, lpckParent, 0);
 176     if (hr != S_OK) {
 177       /* No extra chunks infront of desired chunk? */
 178       if (flags == 0 && hr == MMIOERR_CHUNKNOTFOUND)
 179         hr = AVIERR_OK;
 180       return hr;
 181     }
 182
 183     /* Have we found what we search for? */
 184     if ((lpck->ckid == ckid) &&
 185         (fccType == (FOURCC)0 || lpck->fccType == fccType))
 186       return AVIERR_OK;
 187
 188     /* Skip padding chunks, the others put into the extrachunk-structure */
 189     if (lpck->ckid == ckidAVIPADDING ||
 190         lpck->ckid == mmioFOURCC('p','a','d','d'))
 191       hr = mmioAscend(hmmio, lpck, 0);
 192     else
 193       hr = ReadChunkIntoExtra(extra, hmmio, lpck);
 194     if (FAILED(hr))
 195       return hr;
 196   }
 197 }