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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
21 #include "extrachunk.h"
27 #include "wine/debug.h"
29 WINE_DEFAULT_DEBUG_CHANNEL(avifile);
31 /* reads a chunk outof the extrachunk-structure */
32 HRESULT ReadExtraChunk(const EXTRACHUNKS *extra,FOURCC ckid,LPVOID lpData,LPLONG size)
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),
50 min(((LPDWORD)lp)[1], *(LPDWORD)size));
52 *(LPDWORD)size = ((LPDWORD)lp)[1];
56 /* skip to next chunk */
57 cb -= ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
58 lp += ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
63 /* wanted chunk doesn't exist */
69 /* writes a chunk into the extrachunk-structure */
70 HRESULT WriteExtraChunk(LPEXTRACHUNKS extra,FOURCC ckid,LPCVOID lpData, LONG size)
75 assert(extra != NULL);
76 assert(lpData != NULL);
80 lp = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, extra->lp, extra->cb + size + 2 * sizeof(DWORD));
82 lp = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size + 2 * sizeof(DWORD));
88 lp = (LPDWORD) ((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,const MMCKINFO *lpck)
108 assert(extra != NULL);
109 assert(hmmio != NULL);
110 assert(lpck != NULL);
112 cb = lpck->cksize + 2 * sizeof(DWORD);
115 if (extra->lp != NULL)
116 lp = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, extra->lp, extra->cb + cb);
118 lp = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, cb);
121 return AVIERR_MEMORY;
124 lp = (LPDWORD) ((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) != (LONG)lpck->cksize)
135 return AVIERR_FILEREAD;
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)
151 assert(extra != NULL);
152 assert(hmmio != NULL);
153 assert(lpck != NULL);
155 TRACE("({%p,%u},%p,%p,%p,0x%X)\n", extra->lp, extra->cb, hmmio, lpck,
158 /* what chunk id and form/list type should 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%08X fccType=0x%08X\n", ckid, fccType);
174 hr = mmioDescend(hmmio, lpck, lpckParent, 0);
176 /* No extra chunks in front 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);