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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <assert.h>
  20
  21 #include "extrachunk.h"
  22 #include "winbase.h"
  23 #include "wingdi.h"
  24 #include "winuser.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(const EXTRACHUNKS *extra,FOURCC ckid,LPVOID lpData,LPLONG size)
  33 {
  34   LPBYTE lp;
  35   DWORD  cb;
  36
  37   /* pre-conditions */
  38   assert(extra != NULL);
  39   assert(size != NULL);
  40
  41   lp = extra->lp;
  42   cb = extra->cb;
  43
  44   if (lp != NULL) {
  45     while (cb > 0) {
  46       if (((FOURCC*)lp)[0] == ckid) {
  47         /* found correct chunk */
  48         if (lpData != NULL && *size > 0)
  49           memcpy(lpData, lp + 2 * sizeof(DWORD),
  50                  min(((LPDWORD)lp)[1], *(LPDWORD)size));
  51
  52         *(LPDWORD)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,LPCVOID lpData, LONG size)
  71 {
  72   LPDWORD lp;
  73
  74   /* pre-conditions */
  75   assert(extra != NULL);
  76   assert(lpData != NULL);
  77   assert(size > 0);
  78
  79   if (extra->lp)
  80     lp = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, extra->lp, extra->cb + size + 2 * sizeof(DWORD));
  81   else
  82     lp = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size + 2 * sizeof(DWORD));
  83
  84   if (lp == NULL)
  85     return AVIERR_MEMORY;
  86
  87   extra->lp  = lp;
  88   lp = (LPDWORD) ((LPBYTE)lp + extra->cb);
  89   extra->cb += size + 2 * sizeof(DWORD);
  90
  91   /* insert chunk-header in block */
  92   lp[0] = ckid;
  93   lp[1] = size;
  94
  95   if (lpData != NULL && size > 0)
  96     memcpy(lp + 2, lpData, size);
  97
  98   return AVIERR_OK;
  99 }
 100
 101 /* reads a chunk fomr the HMMIO into the extrachunk-structure */
 102 HRESULT ReadChunkIntoExtra(LPEXTRACHUNKS extra,HMMIO hmmio,const MMCKINFO *lpck)
 103 {
 104   LPDWORD lp;
 105   DWORD   cb;
 106
 107   /* pre-conditions */
 108   assert(extra != NULL);
 109   assert(hmmio != NULL);
 110   assert(lpck  != NULL);
 111
 112   cb  = lpck->cksize + 2 * sizeof(DWORD);
 113   cb += (cb & 1);
 114
 115   if (extra->lp != NULL)
 116     lp = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, extra->lp, extra->cb + cb);
 117   else
 118     lp = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, cb);
 119
 120   if (lp == NULL)
 121     return AVIERR_MEMORY;
 122
 123   extra->lp  = lp;
 124   lp = (LPDWORD) ((LPBYTE)lp + extra->cb);
 125   extra->cb += cb;
 126
 127   /* insert chunk-header in block */
 128   lp[0] = lpck->ckid;
 129   lp[1] = lpck->cksize;
 130
 131   if (lpck->cksize > 0) {
 132     if (mmioSeek(hmmio, lpck->dwDataOffset, SEEK_SET) == -1)
 133       return AVIERR_FILEREAD;
 134     if (mmioRead(hmmio, (HPSTR)&lp[2], lpck->cksize) != (LONG)lpck->cksize)
 135       return AVIERR_FILEREAD;
 136   }
 137
 138   return AVIERR_OK;
 139 }
 140
 141 /* reads all non-junk chunks into the extrachunk-structure until it finds
 142  * the given chunk or the optional parent-chunk is at the end */
 143 HRESULT FindChunkAndKeepExtras(LPEXTRACHUNKS extra,HMMIO hmmio,MMCKINFO *lpck,
 144                                MMCKINFO *lpckParent,UINT flags)
 145 {
 146   FOURCC  ckid;
 147   FOURCC  fccType;
 148   MMRESULT mmr;
 149
 150   /* pre-conditions */
 151   assert(extra != NULL);
 152   assert(hmmio != NULL);
 153   assert(lpck  != NULL);
 154
 155   TRACE("({%p,%u},%p,%p,%p,0x%X)\n", extra->lp, extra->cb, hmmio, lpck,
 156         lpckParent, flags);
 157
 158   /* what chunk id and form/list type should we search? */
 159   if (flags & MMIO_FINDCHUNK) {
 160     ckid    = lpck->ckid;
 161     fccType = 0;
 162   } else if (flags & MMIO_FINDLIST) {
 163     ckid    = FOURCC_LIST;
 164     fccType = lpck->fccType;
 165   } else if (flags & MMIO_FINDRIFF) {
 166     ckid    = FOURCC_RIFF;
 167     fccType = lpck->fccType;
 168   } else
 169     ckid = fccType = (FOURCC)-1; /* collect everything into extra! */
 170
 171   TRACE(": find ckid=0x%08X fccType=0x%08X\n", ckid, fccType);
 172
 173   for (;;) {
 174     mmr = mmioDescend(hmmio, lpck, lpckParent, 0);
 175     if (mmr != MMSYSERR_NOERROR) {
 176       /* No extra chunks in front of desired chunk? */
 177       if (flags == 0 && mmr == MMIOERR_CHUNKNOTFOUND)
 178         return AVIERR_OK;
 179       else
 180         return AVIERR_FILEREAD;
 181     }
 182
 183     /* Have we found what we search for? */
 184     if ((lpck->ckid == ckid) &&
 185         (fccType == 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     {
 192       mmr = mmioAscend(hmmio, lpck, 0);
 193       if (mmr != MMSYSERR_NOERROR) return AVIERR_FILEREAD;
 194     }
 195     else
 196     {
 197       HRESULT hr = ReadChunkIntoExtra(extra, hmmio, lpck);
 198       if (FAILED(hr))
 199         return hr;
 200     }
 201   }
 202 }