bool LLImageDimensionsInfo::getImageDimensionsPng()
{
const S32 PNG_MAGIC_SIZE = 8;
// Make sure the file is long enough.
if (!checkFileLength(PNG_MAGIC_SIZE + 8 + sizeof(S32) * 2 /* width, height */))
{
LL_WARNS() << "Premature end of file" << LL_ENDL;
return false;
}
// Read PNG signature.
const U8 png_magic[PNG_MAGIC_SIZE] = {0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A};
U8 signature[PNG_MAGIC_SIZE];
mInfile.read((void*)signature, PNG_MAGIC_SIZE);
// Make sure it's a PNG file.
if (memcmp(signature, png_magic, PNG_MAGIC_SIZE) != 0)
{
LL_WARNS() << "Not a PNG" << LL_ENDL;
return false;
}
// Read image dimensions.
mInfile.seek(APR_CUR, 8 /* chunk length + chunk type */);
mWidth = read_s32();
mHeight = read_s32();
return true;
}
bool LLImageDimensionsInfo::getImageDimensionsBmp()
{
// Make sure the file is long enough.
const S32 DATA_LEN = 26; // BMP header (14) + DIB header size (4) + width (4) + height (4)
if (!checkFileLength(DATA_LEN))
{
LL_WARNS() << "Premature end of file" << LL_ENDL;
return false;
}
// Read BMP signature.
U8 signature[2];
mInfile.read((void*)signature, sizeof(signature)/sizeof(signature[0]));
// Make sure this is actually a BMP file.
// We only support Windows bitmaps (BM), according to LLImageBMP::updateData().
if (signature[0] != 'B' || signature[1] != 'M')
{
LL_WARNS() << "Not a BMP" << LL_ENDL;
return false;
}
// Read image dimensions.
mInfile.seek(APR_CUR, 16);
mWidth = read_reverse_s32();
mHeight = read_reverse_s32();
return true;
}
bool LLImageDimensionsInfo::getImageDimensionsTga()
{
const S32 TGA_FILE_HEADER_SIZE = 12;
// Make sure the file is long enough.
if (!checkFileLength(TGA_FILE_HEADER_SIZE + 1 /* width */ + 1 /* height */))
{
llwarns << "Premature end of file" << llendl;
return false;
}
mInfile.seek(APR_CUR,TGA_FILE_HEADER_SIZE);
mWidth = read_short();
mHeight = read_short();
// KL for testing purposes.
llinfos << "Tga header reads width: " << mWidth << " and height: " << mHeight << llendl;
return true;
}
bool LLImageDimensionsInfo::getImageDimensionsTga()
{
const S32 TGA_FILE_HEADER_SIZE = 12;
// Make sure the file is long enough.
if (!checkFileLength(TGA_FILE_HEADER_SIZE + 1 /* width */ + 1 /* height */))
{
LL_WARNS() << "Premature end of file" << LL_ENDL;
return false;
}
// *TODO: Detect non-TGA files somehow.
mInfile.seek(APR_CUR,TGA_FILE_HEADER_SIZE);
mWidth = read_byte() | read_byte() << 8;
mHeight = read_byte() | read_byte() << 8;
return true;
}
