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 "wingdi.h"
  25 #include "winuser.h"
  26 #include "windowsx.h"
  27 #include "vfw.h"
  28
  29 #include "wine/debug.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(avifile);
  32
  33 /* reads a chunk outof the extrachunk-structure */
  34 HRESULT ReadExtraChunk(LPEXTRACHUNKS extra,FOURCC ckid,LPVOID lpData,
  35                        LPLONG size)
  36 {
  37   LPBYTE lp;
  38   DWORD  cb;
  39
  40   /* pre-conditions */
  41   assert(extra != NULL);
  42   assert(size != NULL);
  43
  44   lp = extra->lp;
  45   cb = extra->cb;
  46
  47   if (lp != NULL) {
  48     while (cb > 0) {
  49       if (((FOURCC*)lp)[0] == ckid) {
  50         /* found correct chunk */
  51         if (lpData != NULL && *size > 0)
  52           memcpy(lpData, lp + 2 * sizeof(DWORD),
  53                  min(((LPDWORD)lp)[1], *(LPDWORD)size));
  54
  55         *(LPDWORD)size = ((LPDWORD)lp)[1];
  56
  57         return AVIERR_OK;
  58       } else {
  59         /* skip to next chunk */
  60         cb -= ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
  61         lp += ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
  62       }
  63     }
  64   }
  65
  66   /* wanted chunk doesn't exist */
  67   *size = 0;
  68
  69   return AVIERR_NODATA;
  70 }
  71
  72 /* writes a chunk into the extrachunk-structure */
  73 HRESULT WriteExtraChunk(LPEXTRACHUNKS extra,FOURCC ckid,LPVOID lpData,
  74                         LONG size)
  75 {
  76   LPDWORD lp;
  77
  78   /* pre-conditions */
  79   assert(extra != NULL);
  80   assert(lpData != NULL);
  81   assert(size > 0);
  82
  83   if (extra->lp)
  84     lp = (LPDWORD)GlobalReAllocPtr(extra->lp, extra->cb + size + 2 * sizeof(DWORD), GHND);
  85   else
  86     lp = (LPDWORD)GlobalAllocPtr(GHND, size + 2 * sizeof(DWORD));
  87
  88   if (lp == NULL)
  89     return AVIERR_MEMORY;
  90
  91   extra->lp  = lp;
  92   ((LPBYTE)lp) += extra->cb;
  93   extra->cb += size + 2 * sizeof(DWORD);
  94
  95   /* insert chunk-header in block */
  96   lp[0] = ckid;
  97   lp[1] = size;
  98
  99   if (lpData != NULL && size > 0)
 100     memcpy(lp + 2, lpData, size);
 101
 102   return AVIERR_OK;
 103 }
 104
 105 /* reads a chunk fomr the HMMIO into the extrachunk-structure */
 106 HRESULT ReadChunkIntoExtra(LPEXTRACHUNKS extra,HMMIO hmmio,MMCKINFO *lpck)
 107 {
 108   LPDWORD lp;
 109   DWORD   cb;
 110
 111   /* pre-conditions */
 112   assert(extra != NULL);
 113   assert(hmmio != NULL);
 114   assert(lpck  != NULL);
 115
 116   cb  = lpck->cksize + 2 * sizeof(DWORD);
 117   cb += (cb & 1);
 118
 119   if (extra->lp != NULL) {
 120     lp = (LPDWORD)GlobalReAllocPtr(extra->lp, extra->cb + cb, GHND);
 121   } else
 122     lp = (LPDWORD)GlobalAllocPtr(GHND, cb);
 123
 124   if (lp == NULL)
 125     return AVIERR_MEMORY;
 126
 127   extra->lp  = lp;
 128   ((LPBYTE)lp) += extra->cb;
 129   extra->cb += cb;
 130
 131   /* insert chunk-header in block */
 132   lp[0] = lpck->ckid;
 133   lp[1] = lpck->cksize;
 134
 135   if (lpck->cksize > 0) {
 136     if (mmioSeek(hmmio, lpck->dwDataOffset, SEEK_SET) == -1)
 137       return AVIERR_FILEREAD;
 138     if (mmioRead(hmmio, (HPSTR)&lp[2], lpck->cksize) != (LONG)lpck->cksize)
 139       return AVIERR_FILEREAD;
 140   }
 141
 142   return AVIERR_OK;
 143 }
 144
 145 /* reads all non-junk chunks into the extrachunk-structure until it finds
 146  * the given chunk or the optional parent-chunk is at the end */
 147 HRESULT FindChunkAndKeepExtras(LPEXTRACHUNKS extra,HMMIO hmmio,MMCKINFO *lpck,
 148                                MMCKINFO *lpckParent,UINT flags)
 149 {
 150   FOURCC  ckid;
 151   FOURCC  fccType;
 152   HRESULT hr;
 153
 154   /* pre-conditions */
 155   assert(extra != NULL);
 156   assert(hmmio != NULL);
 157   assert(lpck  != NULL);
 158
 159   TRACE("({%p,%lu},%p,%p,%p,0x%X)\n", extra->lp, extra->cb, hmmio, lpck,
 160         lpckParent, flags);
 161
 162   /* what chunk id and form/list type shoiuld we search? */
 163   if (flags & MMIO_FINDCHUNK) {
 164     ckid    = lpck->ckid;
 165     fccType = 0;
 166   } else if (flags & MMIO_FINDLIST) {
 167     ckid    = FOURCC_LIST;
 168     fccType = lpck->fccType;
 169   } else if (flags & MMIO_FINDRIFF) {
 170     ckid    = FOURCC_RIFF;
 171     fccType = lpck->fccType;
 172   } else
 173     ckid = fccType = (FOURCC)-1; /* collect everything into extra! */
 174
 175   TRACE(": find ckid=0x%08lX fccType=0x%08lX\n", ckid, fccType);
 176
 177   for (;;) {
 178     hr = mmioDescend(hmmio, lpck, lpckParent, 0);
 179     if (hr != S_OK) {
 180       /* No extra chunks infront of desired chunk? */
 181       if (flags == 0 && hr == MMIOERR_CHUNKNOTFOUND)
 182         hr = AVIERR_OK;
 183       return hr;
 184     }
 185
 186     /* Have we found what we search for? */
 187     if ((lpck->ckid == ckid) &&
 188         (fccType == (FOURCC)0 || lpck->fccType == fccType))
 189       return AVIERR_OK;
 190
 191     /* Skip padding chunks, the others put into the extrachunk-structure */
 192     if (lpck->ckid == ckidAVIPADDING ||
 193         lpck->ckid == mmioFOURCC('p','a','d','d'))
 194       hr = mmioAscend(hmmio, lpck, 0);
 195     else
 196       hr = ReadChunkIntoExtra(extra, hmmio, lpck);
 197     if (FAILED(hr))
 198       return hr;
 199   }
 200 }