Exemple #1
0
 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;
 }
Exemple #2
0
        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();
        }