iTextSharp.text.pdf.codec.BmpImage.Read8Bit C# (CSharp) Method

        private Image Read8Bit(int paletteEntries)
        {
            byte[] bdata = new byte[width * height];
            // Padding bytes at the end of each scanline
            int padding = 0;

            // width * bitsPerPixel should be divisible by 32
            int bitsPerScanline = width * 8;
            if ( bitsPerScanline%32 != 0) {
                padding = (bitsPerScanline/32 + 1)*32 - bitsPerScanline;
                padding = (int)Math.Ceiling(padding/8.0);
            }

            int imSize = (width + padding) * height;

            // Read till we have the whole image
            byte[] values = new byte[imSize];
            int bytesRead = 0;
            while (bytesRead < imSize) {
                bytesRead += inputStream.Read(values, bytesRead, imSize - bytesRead);
            }

            if (isBottomUp) {

                // Convert the bottom up image to a top down format by copying
                // one scanline from the bottom to the top at a time.
                for (int i=0; i<height; i++) {
                    Array.Copy(values,
                    imSize - (i+1) * (width + padding),
                    bdata,
                    i * width,
                    width);
                }
            } else {
                for (int i=0; i<height; i++) {
                    Array.Copy(values,
                    i * (width + padding),
                    bdata,
                    i * width,
                    width);
                }
            }
            return IndexedModel(bdata, 8, paletteEntries);
        }