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Detect WEBP from content even if it's received with wrong mime type

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This commit is contained in:
JustOff
2017-09-09 15:27:00 +03:00
committed by Roy Tam
parent 2a0fefaccb
commit 4e3a64fcc7
1 changed files with 20 additions and 0 deletions
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image/src/imgLoader.cpp
+20
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@@ -2400,6 +2400,26 @@ nsresult imgLoader::GetMimeTypeFromContent(const char* aContents, uint32_t aLeng
aContentType.AssignLiteral(IMAGE_JPEG);
}
/* maybe a WEBP? */
/* WebP files are technically RIFF files. RIFF is a container format like TIFF.
* WebP files are RIFF files that contain a single WEBP chunk.
*
* To detect it, first check that the first 4 bytes are "RIFF",
* and then that bytes 8-11 are "WEBP".
*/
else if (aLength >= 12 &&
((unsigned char)aContents[0])==0x52 &&
((unsigned char)aContents[1])==0x49 &&
((unsigned char)aContents[2])==0x46 &&
((unsigned char)aContents[3])==0x46 &&
((unsigned char)aContents[8])==0x57 &&
((unsigned char)aContents[9])==0x45 &&
((unsigned char)aContents[10])==0x42 &&
((unsigned char)aContents[11])==0x50)
{
aContentType.AssignLiteral(IMAGE_WEBP);
}
/* or how about ART? */
/* ART begins with JG (4A 47). Major version offset 2.
* Minor version offset 3. Offset 4 must be nullptr.