){kind=link}
/* * BMP HEADER RELATED FUNCTIONS: FUNCTIONS RELATING TO THE
* BMP HEADER, FIRST 14 BYTES IN A BMP FILE.
* Source: https://en.wikipedia.org/wiki/BMP_file_format#Bitmap_file_header
* Offset hex Offset dec Size Purpose
* 00 0 2 bytes The header field used to identify the BMP and DIB file is 0x42 0x4D in hexadecimal, same as BM in ASCII.
* 02 2 4 bytes The size of the BMP file in bytes
* 06 6 2 bytes Reserved; actual value depends on the application that creates the image
* 08 8 2 bytes Reserved; actual value depends on the application that creates the image
* 0A 10 4 bytes The offset, i.e. starting address, of the byte where the bitmap image data (pixel array) can be found.
*/
//Returns image size in bytes (starts at bit 2) from sent in array of bmpFile bytes
public static int GetImageDataSize(byte[] bmpFile)
{
var data = new byte[4];
data = GeneralUse.FillByteArray(bmpFile, 2, 4);
return(BitConverter.ToInt32(data, 0));
}
public static int getBitsPerPixel(byte[] bmpFile)
{
var data = new byte[4];
data = GeneralUse.FillByteArray(bmpFile, 14, 4);
return(BitConverter.ToInt32(data, 0));
}
//Returns image width (starts at bit 18) from sent in array of bmpFile bytes
public static int GetImageWidth(byte[] bmpFile)
{
var data = new byte[4];
data = GeneralUse.FillByteArray(bmpFile, 18, 4);
int imageWidth = BitConverter.ToInt32(data, 0);
return(imageWidth);
}
//Returns image height (starts at bit 22) from sent in array of bmpFile bytes
public static int GetImageHeight(byte[] bmpFile)
{
var data = new byte[4];
data = GeneralUse.FillByteArray(bmpFile, 22, 4);
int imageHeight = BitConverter.ToInt32(data, 0);
return(imageHeight);
}
public static void Driver(byte[] data, List <BmpFileHeader> fileHeaderList, string fileName)
{
int idx;
byte[] buffer;
bool fileStartsWithBMP;
int lastFileHeaderIdx = fileHeaderList.Count - 1;
//Create folder in path that file is in
String directoryName = fileName + "_Output";
Directory.CreateDirectory(directoryName); //Create directory
//Check if file starts with bmp or other file
fileStartsWithBMP = false;
foreach (var fileHeader in fileHeaderList)
{
if (fileHeader.minIndex == 0)
{
fileStartsWithBMP = true;
}
}
if (!fileStartsWithBMP) //case data before first bmp file
{
buffer = GeneralUse.FillByteArray(data, 0, fileHeaderList[0].minIndex);
makeFile(directoryName, buffer, 0, false);
}
//Loop through each bmp file and make al files
for (idx = 0; idx < fileHeaderList.Count; idx++)
{
buffer = GeneralUse.FillByteArray(data, fileHeaderList[idx].minIndex, fileHeaderList[idx].imageSize);
makeFile(directoryName, buffer, fileHeaderList[idx].minIndex, true);
if (idx == lastFileHeaderIdx)
{
break;
} //If end of fileHeaderList reached
if (fileHeaderList[idx].maxIndex + 1 < fileHeaderList[idx + 1].minIndex)
{
buffer = GeneralUse.FillByteArray(data, fileHeaderList[idx].maxIndex + 1, fileHeaderList[idx + 1].minIndex - 1);
makeFile(directoryName, buffer, fileHeaderList[idx].maxIndex + 1, false);
}
} //End for loop
if (fileHeaderList[lastFileHeaderIdx].maxIndex < data.Length - 1) //In case there is data after last bmp file
{
int numBytes = data.Length - 1 - (fileHeaderList[lastFileHeaderIdx].maxIndex);
buffer = GeneralUse.FillByteArray(data, fileHeaderList[lastFileHeaderIdx].maxIndex, numBytes);
makeFile(directoryName, buffer, fileHeaderList[lastFileHeaderIdx].maxIndex + 1, false);
}
}
/*Returns a list of byte[] arrays that are the length of the
* bitmap file header + the DIB header */
public static List <byte[]> getPossibleHeaderBytesList(byte[] data, List <int> headerIndexList)
{
List <byte[]> possibleHeaderBytesList = new List <byte[]>();
int dibHeaderSize;
byte[] header;
for (int i = 0; i < headerIndexList.Count; i++)
{
header = GeneralUse.FillByteArray(data, headerIndexList[i], 18); //Load with bitmap header + 4 to grab dib header size
dibHeaderSize = BmpFileHeader.getDIBHeaderSize(header);
header = GeneralUse.FillByteArray(data, headerIndexList[i], 14 + dibHeaderSize); //fill byte array with both bmp and dib header
possibleHeaderBytesList.Add(header);
}
return(possibleHeaderBytesList);
}