2 * Copyright 2002 Michael Günnewig
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.
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.
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
21 #include "extrachunk.h"
26 #include "wine/debug.h"
28 WINE_DEFAULT_DEBUG_CHANNEL(avifile);
30 /* reads a chunk outof the extrachunk-structure */
31 HRESULT ReadExtraChunk(LPEXTRACHUNKS extra,FOURCC ckid,LPVOID lpData,
38 assert(extra != NULL);
46 if (((FOURCC*)lp)[0] == ckid) {
47 /* found correct chunk */
48 if (lpData != NULL && *size > 0)
49 memcpy(lpData, lp + 2 * sizeof(DWORD), min(((LPDWORD)lp)[1],*size));
51 *size = ((LPDWORD)lp)[1];
55 /* skip to next chunk */
56 cb -= ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
57 lp += ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
62 /* wanted chunk doesn't exist */
68 /* writes a chunk into the extrachunk-structure */
69 HRESULT WriteExtraChunk(LPEXTRACHUNKS extra,FOURCC ckid,LPVOID lpData,
75 assert(extra != NULL);
76 assert(lpData != NULL);
80 lp = (LPDWORD)GlobalReAllocPtr(extra->lp, extra->cb + size + 2 * sizeof(DWORD), GHND);
82 lp = (LPDWORD)GlobalAllocPtr(GHND, size + 2 * sizeof(DWORD));
88 ((LPBYTE)lp) += extra->cb;
89 extra->cb += size + 2 * sizeof(DWORD);
91 /* insert chunk-header in block */
95 if (lpData != NULL && size > 0)
96 memcpy(lp + 2, lpData, size);
101 /* reads a chunk fomr the HMMIO into the extrachunk-structure */
102 HRESULT ReadChunkIntoExtra(LPEXTRACHUNKS extra,HMMIO hmmio,MMCKINFO *lpck)
108 assert(extra != NULL);
109 assert(hmmio != (HMMIO)NULL);
110 assert(lpck != NULL);
112 cb = lpck->cksize + 2 * sizeof(DWORD);
115 if (extra->lp != NULL) {
116 lp = (LPDWORD)GlobalReAllocPtr(extra->lp, extra->cb + cb, GHND);
118 lp = (LPDWORD)GlobalAllocPtr(GHND, cb);
121 return AVIERR_MEMORY;
124 ((LPBYTE)lp) += extra->cb;
127 /* insert chunk-header in block */
129 lp[1] = lpck->cksize;
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) != lpck->cksize)
135 return AVIERR_FILEREAD;
141 /* reads all non-junk chunks into the extrachunk-structure until it founds
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)
151 assert(extra != NULL);
152 assert(hmmio != (HMMIO)NULL);
153 assert(lpck != NULL);
155 TRACE("({%p,%lu},%p,%p,%p,0x%X)\n", extra->lp, extra->cb, hmmio, lpck,
158 /* what chunk id and form/list type shoiuld we search? */
159 if (flags & MMIO_FINDCHUNK) {
162 } else if (flags & MMIO_FINDLIST) {
164 fccType = lpck->fccType;
165 } else if (flags & MMIO_FINDRIFF) {
167 fccType = lpck->fccType;
169 ckid = fccType = (FOURCC)-1; /* collect everything into extra! */
171 TRACE(": find ckid=0x%08lX fccType=0x%08lX\n", ckid, fccType);
174 hr = mmioDescend(hmmio, lpck, lpckParent, 0);
176 /* No extra chunks infront of desired chunk? */
177 if (flags == 0 && hr == MMIOERR_CHUNKNOTFOUND)
182 /* Have we found what we search for? */
183 if ((lpck->ckid == ckid) &&
184 (fccType == (FOURCC)0 || lpck->fccType == fccType))
187 /* Skip padding chunks, the others put into the extrachunk-structure */
188 if (lpck->ckid == ckidAVIPADDING ||
189 lpck->ckid == mmioFOURCC('p','a','d','d'))
190 hr = mmioAscend(hmmio, lpck, 0);
192 hr = ReadChunkIntoExtra(extra, hmmio, lpck);