Sweden-Number/dlls/avifil32/extrachunk.c

197 lines
4.9 KiB
C

/*
* Copyright 2002 Michael Günnewig
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <assert.h>
#include "extrachunk.h"
#include "winbase.h"
#include "windowsx.h"
#include "vfw.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(avifile);
/* reads a chunk outof the extrachunk-structure */
HRESULT ReadExtraChunk(LPEXTRACHUNKS extra,FOURCC ckid,LPVOID lpData,
LPLONG size)
{
LPBYTE lp;
LONG cb;
/* pre-conditions */
assert(extra != NULL);
assert(size != NULL);
lp = extra->lp;
cb = extra->cb;
if (lp != NULL) {
while (cb > 0) {
if (((FOURCC*)lp)[0] == ckid) {
/* found correct chunk */
if (lpData != NULL && *size > 0)
memcpy(lpData, lp + 2 * sizeof(DWORD), min(((LPDWORD)lp)[1],*size));
*size = ((LPDWORD)lp)[1];
return AVIERR_OK;
} else {
/* skip to next chunk */
cb -= ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
lp += ((LPDWORD)lp)[1] + 2 * sizeof(DWORD);
}
}
}
/* wanted chunk doesn't exist */
*size = 0;
return AVIERR_NODATA;
}
/* writes a chunk into the extrachunk-structure */
HRESULT WriteExtraChunk(LPEXTRACHUNKS extra,FOURCC ckid,LPVOID lpData,
LONG size)
{
LPDWORD lp;
/* pre-conditions */
assert(extra != NULL);
assert(lpData != NULL);
assert(size > 0);
if (extra->lp)
lp = (LPDWORD)GlobalReAllocPtr(extra->lp, extra->cb + size + 2 * sizeof(DWORD), GHND);
else
lp = (LPDWORD)GlobalAllocPtr(GHND, size + 2 * sizeof(DWORD));
if (lp == NULL)
return AVIERR_MEMORY;
extra->lp = lp;
((LPBYTE)lp) += extra->cb;
extra->cb += size + 2 * sizeof(DWORD);
/* insert chunk-header in block */
lp[0] = ckid;
lp[1] = size;
if (lpData != NULL && size > 0)
memcpy(lp + 2, lpData, size);
return AVIERR_OK;
}
/* reads a chunk fomr the HMMIO into the extrachunk-structure */
HRESULT ReadChunkIntoExtra(LPEXTRACHUNKS extra,HMMIO hmmio,MMCKINFO *lpck)
{
LPDWORD lp;
LONG cb;
/* pre-conditions */
assert(extra != NULL);
assert(hmmio != (HMMIO)NULL);
assert(lpck != NULL);
cb = lpck->cksize + 2 * sizeof(DWORD);
cb += (cb & 1);
if (extra->lp != NULL) {
lp = (LPDWORD)GlobalReAllocPtr(extra->lp, extra->cb + cb, GHND);
} else
lp = (LPDWORD)GlobalAllocPtr(GHND, cb);
if (lp == NULL)
return AVIERR_MEMORY;
extra->lp = lp;
((LPBYTE)lp) += extra->cb;
extra->cb += cb;
/* insert chunk-header in block */
lp[0] = lpck->ckid;
lp[1] = lpck->cksize;
if (lpck->cksize > 0) {
if (mmioSeek(hmmio, lpck->dwDataOffset, SEEK_SET) == -1)
return AVIERR_FILEREAD;
if (mmioRead(hmmio, (HPSTR)&lp[2], lpck->cksize) != lpck->cksize)
return AVIERR_FILEREAD;
}
return AVIERR_OK;
}
/* reads all non-junk chunks into the extrachunk-structure until it founds
* the given chunk or the optional parent-chunk is at the end */
HRESULT FindChunkAndKeepExtras(LPEXTRACHUNKS extra,HMMIO hmmio,MMCKINFO *lpck,
MMCKINFO *lpckParent,UINT flags)
{
FOURCC ckid;
FOURCC fccType;
HRESULT hr;
/* pre-conditions */
assert(extra != NULL);
assert(hmmio != (HMMIO)NULL);
assert(lpck != NULL);
TRACE("({%p,%lu},%d,%p,%p,0x%X)\n", extra->lp, extra->cb, hmmio, lpck,
lpckParent, flags);
/* what chunk id and form/list type shoiuld we search? */
if (flags & MMIO_FINDCHUNK) {
ckid = lpck->ckid;
fccType = 0;
} else if (flags & MMIO_FINDLIST) {
ckid = FOURCC_LIST;
fccType = lpck->fccType;
} else if (flags & MMIO_FINDRIFF) {
ckid = FOURCC_RIFF;
fccType = lpck->fccType;
} else
ckid = fccType = (FOURCC)-1; /* collect everything into extra! */
TRACE(": find ckid=0x%08lX fccType=0x%08lX\n", ckid, fccType);
for (;;) {
hr = mmioDescend(hmmio, lpck, lpckParent, 0);
if (hr != S_OK) {
/* No extra chunks infront of desired chunk? */
if (flags == 0 && hr == MMIOERR_CHUNKNOTFOUND)
hr = AVIERR_OK;
return hr;
}
/* Have we found what we search for? */
if ((lpck->ckid == ckid) &&
(fccType == (FOURCC)0 || lpck->fccType == fccType))
return AVIERR_OK;
/* Skip padding chunks, the others put into the extrachunk-structure */
if (lpck->ckid == ckidAVIPADDING ||
lpck->ckid == mmioFOURCC('p','a','d','d'))
hr = mmioAscend(hmmio, lpck, 0);
else
hr = ReadChunkIntoExtra(extra, hmmio, lpck);
if (FAILED(hr))
return hr;
}
}