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gdiplus: Support decoders with multiple signatures.

This commit is contained in:
Vincent Povirk 2010-03-08 16:42:36 -06:00 committed by Alexandre Julliard
parent 416eb191cb
commit 738059baf8
1 changed files with 14 additions and 8 deletions
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22
dlls/gdiplus/image.c
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@ -2517,10 +2517,11 @@ static const struct image_codec codecs[NUM_CODECS];
static GpStatus get_decoder_info(IStream* stream, const struct image_codec **result)
{
BYTE signature[8];
const BYTE *pattern, *mask;
LARGE_INTEGER seek;
HRESULT hr;
UINT bytesread;
int i, j;
int i, j, sig;
/* seek to the start of the stream */
seek.QuadPart = 0;
@ -2528,7 +2529,7 @@ static GpStatus get_decoder_info(IStream* stream, const struct image_codec **res
if (FAILED(hr)) return hresult_to_status(hr);
/* read the first 8 bytes */
/* FIXME: This assumes all codecs have one signature <= 8 bytes in length */
/* FIXME: This assumes all codecs have signatures <= 8 bytes in length */
hr = IStream_Read(stream, signature, 8, &bytesread);
if (FAILED(hr)) return hresult_to_status(hr);
if (hr == S_FALSE || bytesread == 0) return GenericError;
@ -2537,13 +2538,18 @@ static GpStatus get_decoder_info(IStream* stream, const struct image_codec **res
if ((codecs[i].info.Flags & ImageCodecFlagsDecoder) &&
bytesread >= codecs[i].info.SigSize)
{
for (j=0; j<codecs[i].info.SigSize; j++)
if ((signature[j] & codecs[i].info.SigMask[j]) != codecs[i].info.SigPattern[j])
break;
if (j == codecs[i].info.SigSize)
for (sig=0; sig<codecs[i].info.SigCount; sig++)
{
*result = &codecs[i];
return Ok;
pattern = &codecs[i].info.SigPattern[codecs[i].info.SigSize*sig];
mask = &codecs[i].info.SigMask[codecs[i].info.SigSize*sig];
for (j=0; j<codecs[i].info.SigSize; j++)
if ((signature[j] & mask[j]) != pattern[j])
break;
if (j == codecs[i].info.SigSize)
{
*result = &codecs[i];
return Ok;
}
}
}
}