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windowscodecs: Implement IWICBitmapDecoderInfo::MatchesPattern.

This commit is contained in:
Vincent Povirk 2009-07-28 16:58:47 -05:00 committed by Alexandre Julliard
parent 4e5ee3699f
commit a13899cc90
1 changed files with 71 additions and 2 deletions
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73
dlls/windowscodecs/info.c
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@ -330,8 +330,77 @@ static HRESULT WINAPI BitmapDecoderInfo_GetPatterns(IWICBitmapDecoderInfo *iface
static HRESULT WINAPI BitmapDecoderInfo_MatchesPattern(IWICBitmapDecoderInfo *iface,
IStream *pIStream, BOOL *pfMatches)
{
FIXME("(%p,%p,%p): stub\n", iface, pIStream, pfMatches);
return E_NOTIMPL;
WICBitmapPattern *patterns;
UINT pattern_count=0, patterns_size=0;
HRESULT hr;
int i, pos;
BYTE *data=NULL;
ULONG datasize=0;
ULONG bytesread;
LARGE_INTEGER seekpos;
TRACE("(%p,%p,%p)\n", iface, pIStream, pfMatches);
hr = BitmapDecoderInfo_GetPatterns(iface, 0, NULL, &pattern_count, &patterns_size);
if (FAILED(hr)) return hr;
patterns = HeapAlloc(GetProcessHeap(), 0, patterns_size);
if (!patterns) return E_OUTOFMEMORY;
hr = BitmapDecoderInfo_GetPatterns(iface, patterns_size, patterns, &pattern_count, &patterns_size);
if (FAILED(hr)) goto end;
for (i=0; i<pattern_count; i++)
{
if (datasize < patterns[i].Length)
{
HeapFree(GetProcessHeap(), 0, data);
datasize = patterns[i].Length;
data = HeapAlloc(GetProcessHeap(), 0, patterns[i].Length);
if (!data)
{
hr = E_OUTOFMEMORY;
break;
}
}
if (patterns[i].EndOfStream)
seekpos.QuadPart = -patterns[i].Position.QuadPart;
else
seekpos.QuadPart = patterns[i].Position.QuadPart;
hr = IStream_Seek(pIStream, seekpos, patterns[i].EndOfStream ? STREAM_SEEK_END : STREAM_SEEK_SET, NULL);
if (hr == STG_E_INVALIDFUNCTION) continue; /* before start of stream */
if (FAILED(hr)) break;
hr = IStream_Read(pIStream, data, patterns[i].Length, &bytesread);
if (hr == S_FALSE || (hr == S_OK && bytesread != patterns[i].Length)) /* past end of stream */
continue;
if (FAILED(hr)) break;
for (pos=0; pos<patterns[i].Length; pos++)
{
if ((data[pos] & patterns[i].Mask[pos]) != patterns[i].Pattern[pos])
break;
}
if (pos == patterns[i].Length) /* matches pattern */
{
hr = S_OK;
*pfMatches = TRUE;
break;
}
}
if (i == pattern_count) /* does not match any pattern */
{
hr = S_OK;
*pfMatches = FALSE;
}
end:
HeapFree(GetProcessHeap(), 0, patterns);
HeapFree(GetProcessHeap(), 0, data);
return hr;
}
static HRESULT WINAPI BitmapDecoderInfo_CreateInstance(IWICBitmapDecoderInfo *iface,