private Chunk getChunk(System.IO.Stream inputStream)
{
Chunk chunk = new Chunk();
chunk.SetLength(GetLong(inputStream)); // The length of the data chunk.
chunk.SetType(GetBytes(inputStream, 4)); // The chunk type.
chunk.SetData(GetBytes(inputStream, chunk.GetLength())); // The chunk data.
chunk.SetCrc(GetLong(inputStream)); // CRC of the type and data chunks.
if (!chunk.hasGoodCRC()) {
throw new Exception("Chunk has bad CRC.");
}
return chunk;
}
public PNGImage(Stream inputStream)
{
this.ValidatePNG(inputStream);
List <Chunk> list = new List <Chunk>();
this.ProcessPNG(list, inputStream);
for (int i = 0; i < list.Count; i++)
{
Chunk chunk = list[i];
if (chunk.type[0] == 73 && chunk.type[1] == 72 && chunk.type[2] == 68 && chunk.type[3] == 82)
{
this.w = this.ToIntValue(chunk.GetData(), 0);
this.h = this.ToIntValue(chunk.GetData(), 4);
this.bitDepth = chunk.GetData()[8];
this.colorType = (int)chunk.GetData()[9];
}
else
{
if (chunk.type[0] == 73 && chunk.type[1] == 68 && chunk.type[2] == 65 && chunk.type[3] == 84)
{
this.data = this.AppendIdatChunk(this.data, chunk.GetData());
}
else
{
if (chunk.type[0] == 80 && chunk.type[1] == 76 && chunk.type[2] == 84 && chunk.type[3] == 69)
{
this.rgb = chunk.GetData();
if (this.rgb.Length % 3 != 0)
{
throw new Exception("Incorrect palette length.");
}
}
else
{
if (chunk.type[0] != 103 || chunk.type[1] != 65 || chunk.type[2] != 77 || chunk.type[3] != 65)
{
if (chunk.type[0] == 116 && chunk.type[1] == 82 && chunk.type[2] == 78 && chunk.type[3] == 83)
{
if (this.colorType == 3)
{
this.alphaForPalette = new byte[this.w * this.h];
for (int j = 0; j < this.alphaForPalette.Length; j++)
{
this.alphaForPalette[j] = 255;
}
byte[] array = chunk.GetData();
for (int k = 0; k < array.Length; k++)
{
this.alphaForPalette[k] = array[k];
}
}
}
else
{
if ((chunk.type[0] != 99 || chunk.type[1] != 72 || chunk.type[2] != 82 || chunk.type[3] != 77) && (chunk.type[0] != 115 || chunk.type[1] != 66 || chunk.type[2] != 73 || chunk.type[3] != 84) && chunk.type[0] == 98 && chunk.type[1] == 75 && chunk.type[2] == 71)
{
byte arg_2B6_0 = chunk.type[3];
}
}
}
}
}
}
}
this.inflated = this.GetDecompressedData();
if (this.colorType == 0)
{
if (this.bitDepth == 16)
{
this.image = this.getImageColorType0BitDepth16();
}
else
{
if (this.bitDepth == 8)
{
this.image = this.getImageColorType0BitDepth8();
}
else
{
if (this.bitDepth == 4)
{
this.image = this.getImageColorType0BitDepth4();
}
else
{
if (this.bitDepth == 2)
{
this.image = this.getImageColorType0BitDepth2();
}
else
{
if (this.bitDepth != 1)
{
throw new Exception("Image with unsupported bit depth == " + this.bitDepth);
}
this.image = this.getImageColorType0BitDepth1();
}
}
}
}
}
else
{
if (this.colorType == 6)
{
this.image = this.getImageColorType6BitDepth8();
}
else
{
if (this.rgb == null)
{
if (this.bitDepth == 16)
{
this.image = this.getImageColorType2BitDepth16();
}
else
{
this.image = this.getImageColorType2BitDepth8();
}
}
else
{
if (this.bitDepth == 8)
{
this.image = this.getImageColorType3BitDepth8();
}
else
{
if (this.bitDepth == 4)
{
this.image = this.getImageColorType3BitDepth4();
}
else
{
if (this.bitDepth == 2)
{
this.image = this.getImageColorType3BitDepth2();
}
else
{
if (this.bitDepth != 1)
{
throw new Exception("Image with unsupported bit depth == " + this.bitDepth);
}
this.image = this.getImageColorType3BitDepth1();
}
}
}
}
}
}
this.deflated = this.DeflateReconstructedData();
}
/**
* Used to embed PNG images in the PDF document.
*
*/
public PNGImage(Stream inputStream)
{
ValidatePNG(inputStream);
List <Chunk> chunks = new List <Chunk>();
ProcessPNG(chunks, inputStream);
for (int i = 0; i < chunks.Count; i++)
{
Chunk chunk = chunks[i];
if (chunk.type[0] == 'I' &&
chunk.type[1] == 'H' &&
chunk.type[2] == 'D' &&
chunk.type[3] == 'R')
{
this.w = ToIntValue(chunk.GetData(), 0); // Width
this.h = ToIntValue(chunk.GetData(), 4); // Height
this.bitDepth = chunk.GetData()[8]; // Bit Depth
this.colorType = chunk.GetData()[9]; // Color Type
// Console.WriteLine(
// "Bit Depth == " + chunk.GetData()[ 8 ] );
// Console.WriteLine(
// "Color Type == " + chunk.GetData()[ 9 ] );
// Console.WriteLine( chunk.GetData()[ 10 ] );
// Console.WriteLine( chunk.GetData()[ 11 ] );
// Console.WriteLine( chunk.GetData()[ 12 ] );
if (chunk.GetData()[12] == 1)
{
// TODO:
// Console.WriteLine("Interlaced PNG images are not supported.\nConvert the image using OptiPNG:\noptipng -i0 -o7 myimage.png\n");
}
}
else if (chunk.type[0] == 'I' &&
chunk.type[1] == 'D' &&
chunk.type[2] == 'A' &&
chunk.type[3] == 'T')
{
data = AppendIdatChunk(data, chunk.GetData());
}
else if (chunk.type[0] == 'P' &&
chunk.type[1] == 'L' &&
chunk.type[2] == 'T' &&
chunk.type[3] == 'E')
{
rgb = chunk.GetData();
if (rgb.Length % 3 != 0)
{
throw new Exception("Incorrect palette length.");
}
}
else if (chunk.type[0] == 'g' &&
chunk.type[1] == 'A' &&
chunk.type[2] == 'M' &&
chunk.type[3] == 'A')
{
// TODO:
// Console.WriteLine("gAMA chunk found!");
}
else if (chunk.type[0] == 't' &&
chunk.type[1] == 'R' &&
chunk.type[2] == 'N' &&
chunk.type[3] == 'S')
{
// Console.WriteLine("tRNS chunk found!");
if (colorType == 3)
{
alphaForPalette = new byte[this.w * this.h];
for (int j = 0; j < alphaForPalette.Length; j++)
{
alphaForPalette[j] = (byte)0xff;
}
byte[] alpha = chunk.GetData();
for (int j = 0; j < alpha.Length; j++)
{
alphaForPalette[j] = alpha[j];
}
}
}
else if (chunk.type[0] == 'c' &&
chunk.type[1] == 'H' &&
chunk.type[2] == 'R' &&
chunk.type[3] == 'M')
{
// TODO:
// Console.WriteLine("cHRM chunk found!");
}
else if (chunk.type[0] == 's' &&
chunk.type[1] == 'B' &&
chunk.type[2] == 'I' &&
chunk.type[3] == 'T')
{
// TODO:
// Console.WriteLine("sBIT chunk found!");
}
else if (chunk.type[0] == 'b' &&
chunk.type[1] == 'K' &&
chunk.type[2] == 'G' &&
chunk.type[3] == 'D')
{
// TODO:
// Console.WriteLine("bKGD chunk found!");
}
}
inflated = GetDecompressedData();
if (colorType == 0)
{
// Grayscale Image
if (bitDepth == 16)
{
image = getImageColorType0BitDepth16();
}
else if (bitDepth == 8)
{
image = getImageColorType0BitDepth8();
}
else if (bitDepth == 4)
{
image = getImageColorType0BitDepth4();
}
else if (bitDepth == 2)
{
image = getImageColorType0BitDepth2();
}
else if (bitDepth == 1)
{
image = getImageColorType0BitDepth1();
}
else
{
throw new Exception("Image with unsupported bit depth == " + bitDepth);
}
}
else if (colorType == 6)
{
if (bitDepth == 8)
{
image = getImageColorType6BitDepth8();
}
else
{
throw new Exception("Image with unsupported bit depth == " + bitDepth);
}
}
else
{
// Color Image
if (rgb == null)
{
// Trucolor Image
if (bitDepth == 16)
{
image = getImageColorType2BitDepth16();
}
else
{
image = getImageColorType2BitDepth8();
}
}
else
{
// Indexed Image
if (bitDepth == 8)
{
image = getImageColorType3BitDepth8();
}
else if (bitDepth == 4)
{
image = getImageColorType3BitDepth4();
}
else if (bitDepth == 2)
{
image = getImageColorType3BitDepth2();
}
else if (bitDepth == 1)
{
image = getImageColorType3BitDepth1();
}
else
{
throw new Exception("Image with unsupported bit depth == " + bitDepth);
}
}
}
deflated = DeflateReconstructedData();
}
public PNGImage(System.IO.Stream inputStream)
{
validatePNG(inputStream);
List <Chunk> chunks = new List <Chunk>();
processPNG(chunks, inputStream);
for (int i = 0; i < chunks.Count; i++)
{
Chunk chunk = chunks[i];
if (chunk.type[0] == 'I' &&
chunk.type[1] == 'H' &&
chunk.type[2] == 'D' &&
chunk.type[3] == 'R')
{
this.w = toIntValue(chunk.GetData(), 0); // Width
this.h = toIntValue(chunk.GetData(), 4); // Height
this.bitDepth = chunk.GetData()[8]; // Bit Depth
this.colorType = chunk.GetData()[9]; // Color Type
// Console.WriteLine(
// "Bit Depth == " + chunk.GetData()[ 8 ] );
// Console.WriteLine(
// "Color Type == " + chunk.GetData()[ 9 ] );
// Console.WriteLine( chunk.GetData()[ 10 ] );
// Console.WriteLine( chunk.GetData()[ 11 ] );
// Console.WriteLine( chunk.GetData()[ 12 ] );
}
else if (chunk.type[0] == 'I' &&
chunk.type[1] == 'D' &&
chunk.type[2] == 'A' &&
chunk.type[3] == 'T')
{
data = appendIdatChunk(data, chunk.GetData());
}
else if (chunk.type[0] == 'P' &&
chunk.type[1] == 'L' &&
chunk.type[2] == 'T' &&
chunk.type[3] == 'E')
{
rgb = chunk.GetData();
if (rgb.Length % 3 != 0)
{
throw new Exception("Incorrect palette length.");
}
}
}
inflated = getDecompressedData();
if (colorType == 0)
{
// Grayscale Image
if (bitDepth == 16)
{
image = getImageColorType0BitDepth16();
}
else if (bitDepth == 8)
{
image = getImageColorType0BitDepth8();
}
else if (bitDepth == 4)
{
image = getImageColorType0BitDepth4();
}
else if (bitDepth == 2)
{
image = getImageColorType0BitDepth2();
}
else if (bitDepth == 1)
{
image = getImageColorType0BitDepth1();
}
else
{
throw new Exception("Image with unsupported bit depth == " + bitDepth);
}
}
else if (colorType == 6)
{
image = getImageColorType6BitDepth8();
}
else
{
// Color Image
if (rgb == null)
{
// Trucolor Image
if (bitDepth == 16)
{
image = getImageColorType2BitDepth16();
}
else
{
image = getImageColorType2BitDepth8();
}
}
else
{
// Indexed Image
if (bitDepth == 8)
{
image = getImageColorType3BitDepth8();
}
else if (bitDepth == 4)
{
image = getImageColorType3BitDepth4();
}
else if (bitDepth == 2)
{
image = getImageColorType3BitDepth2();
}
else if (bitDepth == 1)
{
image = getImageColorType3BitDepth1();
}
else
{
throw new Exception("Image with unsupported bit depth == " + bitDepth);
}
}
}
deflated = deflateReconstructedData();
}
