iTextSharp.text.pdf.codec.BmpImage.DecodeRLE C# (CSharp) Метод

        private byte[] DecodeRLE(bool is8, byte[] values)
        {
            byte[] val = new byte[width * height];
            try {
                int ptr = 0;
                int x = 0;
                int q = 0;
                for (int y = 0; y < height && ptr < values.Length;) {
                    int count = values[ptr++] & 0xff;
                    if (count != 0) {
                        // encoded mode
                        int bt = values[ptr++] & 0xff;
                        if (is8) {
                            for (int i = count; i != 0; --i) {
                                val[q++] = (byte)bt;
                            }
                        }
                        else {
                            for (int i = 0; i < count; ++i) {
                                val[q++] = (byte)((i & 1) == 1 ? (bt & 0x0f) : ((bt >> 4) & 0x0f));
                            }
                        }
                        x += count;
                    }
                    else {
                        // escape mode
                        count = values[ptr++] & 0xff;
                        if (count == 1)
                            break;
                        switch (count) {
                            case 0:
                                x = 0;
                                ++y;
                                q = y * width;
                                break;
                            case 2:
                                // delta mode
                                x += values[ptr++] & 0xff;
                                y += values[ptr++] & 0xff;
                                q = y * width + x;
                                break;
                            default:
                                // absolute mode
                                if (is8) {
                                    for (int i = count; i != 0; --i)
                                        val[q++] = (byte)(values[ptr++] & 0xff);
                                }
                                else {
                                    int bt = 0;
                                    for (int i = 0; i < count; ++i) {
                                        if ((i & 1) == 0)
                                            bt = values[ptr++] & 0xff;
                                        val[q++] = (byte)((i & 1) == 1 ? (bt & 0x0f) : ((bt >> 4) & 0x0f));
                                    }
                                }
                                x += count;
                                // read pad byte
                                if (is8) {
                                    if ((count & 1) == 1)
                                        ++ptr;
                                }
                                else {
                                    if ((count & 3) == 1 || (count & 3) == 2)
                                        ++ptr;
                                }
                                break;
                        }
                    }
                }
            }
            catch {
                //empty on purpose
            }

            return val;
        }