public byte[] Decode(byte[] b, PdfName filterName, PdfObject decodeParams, PdfDictionary streamDictionary)
{
PdfNumber wn = (PdfNumber)PdfReader.GetPdfObjectRelease(streamDictionary.Get(PdfName.WIDTH));
PdfNumber hn = (PdfNumber)PdfReader.GetPdfObjectRelease(streamDictionary.Get(PdfName.HEIGHT));
if (wn == null || hn == null)
{
throw new UnsupportedPdfException(MessageLocalization.GetComposedMessage("filter.ccittfaxdecode.is.only.supported.for.images"));
}
int width = wn.IntValue;
int height = hn.IntValue;
PdfDictionary param = decodeParams is PdfDictionary ? (PdfDictionary)decodeParams : null;
int k = 0;
bool blackIs1 = false;
bool byteAlign = false;
if (param != null)
{
PdfNumber kn = param.GetAsNumber(PdfName.K);
if (kn != null)
{
k = kn.IntValue;
}
PdfBoolean bo = param.GetAsBoolean(PdfName.BLACKIS1);
if (bo != null)
{
blackIs1 = bo.BooleanValue;
}
bo = param.GetAsBoolean(PdfName.ENCODEDBYTEALIGN);
if (bo != null)
{
byteAlign = bo.BooleanValue;
}
}
byte[] outBuf = new byte[(width + 7) / 8 * height];
TIFFFaxDecompressor decoder = new TIFFFaxDecompressor();
if (k == 0 || k > 0)
{
int tiffT4Options = k > 0 ? TIFFConstants.GROUP3OPT_2DENCODING : 0;
tiffT4Options |= byteAlign ? TIFFConstants.GROUP3OPT_FILLBITS : 0;
decoder.SetOptions(1, TIFFConstants.COMPRESSION_CCITTFAX3, tiffT4Options, 0);
decoder.DecodeRaw(outBuf, b, width, height);
if (decoder.fails > 0)
{
byte[] outBuf2 = new byte[(width + 7) / 8 * height];
int oldFails = decoder.fails;
decoder.SetOptions(1, TIFFConstants.COMPRESSION_CCITTRLE, tiffT4Options, 0);
decoder.DecodeRaw(outBuf2, b, width, height);
if (decoder.fails < oldFails)
{
outBuf = outBuf2;
}
}
}
else
{
TIFFFaxDecoder deca = new TIFFFaxDecoder(1, width, height);
deca.DecodeT6(outBuf, b, 0, height, 0);
}
if (!blackIs1)
{
int len = outBuf.Length;
for (int t = 0; t < len; ++t)
{
outBuf[t] ^= 0xff;
}
}
b = outBuf;
return(b);
}
public virtual byte[] Decode(byte[] b, PdfName filterName, PdfObject decodeParams, PdfDictionary streamDictionary
)
{
PdfNumber wn = streamDictionary.GetAsNumber(PdfName.Width);
PdfNumber hn = streamDictionary.GetAsNumber(PdfName.Height);
if (wn == null || hn == null)
{
throw new PdfException(PdfException.FilterCcittfaxdecodeIsOnlySupportedForImages);
}
int width = wn.IntValue();
int height = hn.IntValue();
PdfDictionary param = decodeParams is PdfDictionary ? (PdfDictionary)decodeParams : null;
int k = 0;
bool blackIs1 = false;
bool byteAlign = false;
if (param != null)
{
PdfNumber kn = param.GetAsNumber(PdfName.K);
if (kn != null)
{
k = kn.IntValue();
}
PdfBoolean bo = param.GetAsBoolean(PdfName.BlackIs1);
if (bo != null)
{
blackIs1 = bo.GetValue();
}
bo = param.GetAsBoolean(PdfName.EncodedByteAlign);
if (bo != null)
{
byteAlign = bo.GetValue();
}
}
byte[] outBuf = new byte[(width + 7) / 8 * height];
TIFFFaxDecompressor decoder = new TIFFFaxDecompressor();
if (k == 0 || k > 0)
{
int tiffT4Options = k > 0 ? TIFFConstants.GROUP3OPT_2DENCODING : 0;
tiffT4Options |= byteAlign ? TIFFConstants.GROUP3OPT_FILLBITS : 0;
decoder.SetOptions(1, TIFFConstants.COMPRESSION_CCITTFAX3, tiffT4Options, 0);
decoder.DecodeRaw(outBuf, b, width, height);
if (decoder.fails > 0)
{
byte[] outBuf2 = new byte[(width + 7) / 8 * height];
int oldFails = decoder.fails;
decoder.SetOptions(1, TIFFConstants.COMPRESSION_CCITTRLE, tiffT4Options, 0);
decoder.DecodeRaw(outBuf2, b, width, height);
if (decoder.fails < oldFails)
{
outBuf = outBuf2;
}
}
}
else
{
TIFFFaxDecoder deca = new TIFFFaxDecoder(1, width, height);
deca.DecodeT6(outBuf, b, 0, height, 0);
}
if (!blackIs1)
{
int len = outBuf.Length;
for (int t = 0; t < len; ++t)
{
outBuf[t] ^= 0xff;
}
}
b = outBuf;
return(b);
}
