/// <summary>Processes a RIFF data sequence.</summary>
/// <param name="reader">
/// the
/// <see cref="Com.Drew.Lang.SequentialReader"/>
/// from which the data should be read
/// </param>
/// <param name="handler">
/// the
/// <see cref="RiffHandler"/>
/// that will coordinate processing and accept read values
/// </param>
/// <exception cref="RiffProcessingException">
/// if an error occurred during the processing of RIFF data that could not be
/// ignored or recovered from
/// </exception>
/// <exception cref="System.IO.IOException">an error occurred while accessing the required data</exception>
/// <exception cref="Com.Drew.Imaging.Riff.RiffProcessingException"/>
public virtual void ProcessRiff([NotNull] SequentialReader reader, [NotNull] RiffHandler handler)
{
// RIFF files are always little-endian
reader.SetMotorolaByteOrder(false);
// PROCESS FILE HEADER
string fileFourCC = reader.GetString(4);
if (!fileFourCC.Equals("RIFF"))
{
throw new RiffProcessingException("Invalid RIFF header: " + fileFourCC);
}
// The total size of the chunks that follow plus 4 bytes for the 'WEBP' FourCC
int fileSize = reader.GetInt32();
int sizeLeft = fileSize;
string identifier = reader.GetString(4);
sizeLeft -= 4;
if (!handler.ShouldAcceptRiffIdentifier(identifier))
{
return;
}
// PROCESS CHUNKS
while (sizeLeft != 0)
{
string chunkFourCC = reader.GetString(4);
int chunkSize = reader.GetInt32();
sizeLeft -= 8;
// NOTE we fail a negative chunk size here (greater than 0x7FFFFFFF) as Java cannot
// allocate arrays larger than this.
if (chunkSize < 0 || sizeLeft < chunkSize)
{
throw new RiffProcessingException("Invalid RIFF chunk size");
}
if (handler.ShouldAcceptChunk(chunkFourCC))
{
// TODO is it feasible to avoid copying the chunk here, and to pass the sequential reader to the handler?
handler.ProcessChunk(chunkFourCC, reader.GetBytes(chunkSize));
}
else
{
reader.Skip(chunkSize);
}
sizeLeft -= chunkSize;
// Skip any padding byte added to keep chunks aligned to even numbers of bytes
if (chunkSize % 2 == 1)
{
reader.GetInt8();
sizeLeft--;
}
}
}
/// <summary>Processes a RIFF data sequence.</summary>
/// <param name="reader">The <see cref="SequentialReader"/> from which the data should be read.</param>
/// <param name="handler">The <see cref="IRiffHandler"/> that will coordinate processing and accept read values.</param>
/// <exception cref="RiffProcessingException">An error occurred during the processing of RIFF data that could not be ignored or recovered from.</exception>
/// <exception cref="System.IO.IOException">an error occurred while accessing the required data</exception>
public void ProcessRiff([NotNull] SequentialReader reader, [NotNull] IRiffHandler handler)
{
// RIFF files are always little-endian
reader = reader.WithByteOrder(isMotorolaByteOrder: false);
// PROCESS FILE HEADER
var fileFourCc = reader.GetString(4, Encoding.ASCII);
if (fileFourCc != "RIFF")
{
throw new RiffProcessingException("Invalid RIFF header: " + fileFourCc);
}
// The total size of the chunks that follow plus 4 bytes for the 'WEBP' or 'AVI ' FourCC
int fileSize = reader.GetInt32();
int sizeLeft = fileSize;
string identifier = reader.GetString(4, Encoding.ASCII);
sizeLeft -= 4;
if (!handler.ShouldAcceptRiffIdentifier(identifier))
{
return;
}
ProcessChunks(reader, sizeLeft, handler);
}
// PROCESS CHUNKS
private static void ProcessChunks(SequentialReader reader, long maxPosition, IRiffHandler handler)
{
// Processing chunks. Each chunk is 8 bytes header (4 bytes CC code + 4 bytes length of chunk) + data of the chunk
while (reader.Position < maxPosition - 8)
{
string chunkFourCc = reader.GetString(4, Encoding.ASCII);
int chunkSize = reader.GetInt32();
// NOTE we fail a negative chunk size here (greater than 0x7FFFFFFF) as we cannot allocate arrays larger than this
if (chunkSize < 0 || chunkSize + reader.Position > maxPosition)
{
throw new RiffProcessingException("Invalid RIFF chunk size");
}
if (chunkFourCc == "LIST" || chunkFourCc == "RIFF")
{
string listName = reader.GetString(4, Encoding.ASCII);
if (handler.ShouldAcceptList(listName))
{
ProcessChunks(reader, reader.Position + chunkSize - 4, handler);
}
else
{
reader.Skip(chunkSize - 4);
}
}
else
{
if (handler.ShouldAcceptChunk(chunkFourCc))
{
// TODO is it feasible to avoid copying the chunk here, and to pass the sequential reader to the handler?
handler.ProcessChunk(chunkFourCc, reader.GetBytes(chunkSize));
}
else
{
reader.Skip(chunkSize);
}
// Skip any padding byte added to keep chunks aligned to even numbers of bytes
if (chunkSize % 2 == 1)
{
reader.Skip(1);
}
}
}
}
static TgaTagInfo GetTag(SequentialReader reader)
{
return(new TgaTagInfo(reader.GetInt16(), reader.GetInt32(), reader.GetInt32()));
}
public virtual void Extract([NotNull] SequentialReader reader, [NotNull] Com.Drew.Metadata.Metadata metadata)
{
PsdHeaderDirectory directory = new PsdHeaderDirectory();
metadata.AddDirectory(directory);
// FILE HEADER SECTION
try
{
int signature = reader.GetInt32();
if (signature != unchecked ((int)(0x38425053)))
{
// "8BPS"
directory.AddError("Invalid PSD file signature");
return;
}
int version = reader.GetUInt16();
if (version != 1 && version != 2)
{
directory.AddError("Invalid PSD file version (must be 1 or 2)");
return;
}
// 6 reserved bytes are skipped here. They should be zero.
reader.Skip(6);
int channelCount = reader.GetUInt16();
directory.SetInt(PsdHeaderDirectory.TagChannelCount, channelCount);
// even though this is probably an unsigned int, the max height in practice is 300,000
int imageHeight = reader.GetInt32();
directory.SetInt(PsdHeaderDirectory.TagImageHeight, imageHeight);
// even though this is probably an unsigned int, the max width in practice is 300,000
int imageWidth = reader.GetInt32();
directory.SetInt(PsdHeaderDirectory.TagImageWidth, imageWidth);
int bitsPerChannel = reader.GetUInt16();
directory.SetInt(PsdHeaderDirectory.TagBitsPerChannel, bitsPerChannel);
int colorMode = reader.GetUInt16();
directory.SetInt(PsdHeaderDirectory.TagColorMode, colorMode);
}
catch (IOException)
{
directory.AddError("Unable to read PSD header");
return;
}
// COLOR MODE DATA SECTION
try
{
long sectionLength = reader.GetUInt32();
/*
* Only indexed color and duotone (see the mode field in the File header section) have color mode data.
* For all other modes, this section is just the 4-byte length field, which is set to zero.
*
* Indexed color images: length is 768; color data contains the color table for the image,
* in non-interleaved order.
* Duotone images: color data contains the duotone specification (the format of which is not documented).
* Other applications that read Photoshop files can treat a duotone image as a gray image,
* and just preserve the contents of the duotone information when reading and writing the
* file.
*/
reader.Skip(sectionLength);
}
catch (IOException)
{
return;
}
// IMAGE RESOURCES SECTION
try
{
long sectionLength = reader.GetUInt32();
System.Diagnostics.Debug.Assert((sectionLength <= int.MaxValue));
new PhotoshopReader().Extract(reader, (int)sectionLength, metadata);
}
catch (IOException)
{
}
}
public IEnumerable <PngChunk> Extract([NotNull] SequentialReader reader, [CanBeNull] ICollection <PngChunkType> desiredChunkTypes)
{
//
// PNG DATA STREAM
//
// Starts with a PNG SIGNATURE, followed by a sequence of CHUNKS.
//
// PNG SIGNATURE
//
// Always composed of these bytes: 89 50 4E 47 0D 0A 1A 0A
//
// CHUNK
//
// 4 - length of the data field (unsigned, but always within 31 bytes), may be zero
// 4 - chunk type, restricted to [65,90] and [97,122] (A-Za-z)
// * - data field
// 4 - CRC calculated from chunk type and chunk data, but not length
//
// CHUNK TYPES
//
// Critical Chunk Types:
//
// IHDR - image header, always the first chunk in the data stream
// PLTE - palette table, associated with indexed PNG images
// IDAT - image data chunk, of which there may be many
// IEND - image trailer, always the last chunk in the data stream
//
// Ancillary Chunk Types:
//
// Transparency information: tRNS
// Colour space information: cHRM, gAMA, iCCP, sBIT, sRGB
// Textual information: iTXt, tEXt, zTXt
// Miscellaneous information: bKGD, hIST, pHYs, sPLT
// Time information: tIME
//
// network byte order
reader = reader.WithByteOrder(isMotorolaByteOrder: true);
if (!_pngSignatureBytes.SequenceEqual(reader.GetBytes(_pngSignatureBytes.Length)))
{
throw new PngProcessingException("PNG signature mismatch");
}
var seenImageHeader = false;
var seenImageTrailer = false;
var chunks = new List <PngChunk>();
var seenChunkTypes = new HashSet <PngChunkType>();
while (!seenImageTrailer)
{
// Process the next chunk.
var chunkDataLength = reader.GetInt32();
if (chunkDataLength < 0)
{
throw new PngProcessingException("PNG chunk length exceeds maximum");
}
var chunkType = new PngChunkType(reader.GetBytes(4));
var willStoreChunk = desiredChunkTypes == null || desiredChunkTypes.Contains(chunkType);
var chunkData = reader.GetBytes(chunkDataLength);
// Skip the CRC bytes at the end of the chunk
// TODO consider verifying the CRC value to determine if we're processing bad data
reader.Skip(4);
if (willStoreChunk && seenChunkTypes.Contains(chunkType) && !chunkType.AreMultipleAllowed)
{
throw new PngProcessingException($"Observed multiple instances of PNG chunk '{chunkType}', for which multiples are not allowed");
}
if (chunkType.Equals(PngChunkType.IHDR))
{
seenImageHeader = true;
}
else if (!seenImageHeader)
{
throw new PngProcessingException($"First chunk should be '{PngChunkType.IHDR}', but '{chunkType}' was observed");
}
if (chunkType.Equals(PngChunkType.IEND))
{
seenImageTrailer = true;
}
if (willStoreChunk)
{
chunks.Add(new PngChunk(chunkType, chunkData));
}
seenChunkTypes.Add(chunkType);
}
return(chunks);
}
/// <summary>Processes a RIFF data sequence.</summary>
/// <param name="reader">The <see cref="SequentialReader"/> from which the data should be read.</param>
/// <param name="handler">The <see cref="IRiffHandler"/> that will coordinate processing and accept read values.</param>
/// <exception cref="RiffProcessingException">An error occurred during the processing of RIFF data that could not be ignored or recovered from.</exception>
/// <exception cref="System.IO.IOException">an error occurred while accessing the required data</exception>
public void ProcessRiff([NotNull] SequentialReader reader, [NotNull] IRiffHandler handler)
{
// RIFF files are always little-endian
reader = reader.WithByteOrder(isMotorolaByteOrder: false);
// PROCESS FILE HEADER
var fileFourCc = reader.GetString(4, Encoding.UTF8);
if (fileFourCc != "RIFF")
{
throw new RiffProcessingException("Invalid RIFF header: " + fileFourCc);
}
// The total size of the chunks that follow plus 4 bytes for the 'WEBP' FourCC
var fileSize = reader.GetInt32();
var sizeLeft = fileSize;
var identifier = reader.GetString(4, Encoding.UTF8);
sizeLeft -= 4;
if (!handler.ShouldAcceptRiffIdentifier(identifier))
{
return;
}
// PROCESS CHUNKS
while (sizeLeft != 0)
{
var chunkFourCc = reader.GetString(4, Encoding.UTF8);
var chunkSize = reader.GetInt32();
sizeLeft -= 8;
// NOTE we fail a negative chunk size here (greater than 0x7FFFFFFF) as we cannot allocate arrays larger than this
if (chunkSize < 0 || sizeLeft < chunkSize)
{
throw new RiffProcessingException("Invalid RIFF chunk size");
}
if (handler.ShouldAcceptChunk(chunkFourCc))
{
// TODO is it feasible to avoid copying the chunk here, and to pass the sequential reader to the handler?
handler.ProcessChunk(chunkFourCc, reader.GetBytes(chunkSize));
}
else
{
reader.Skip(chunkSize);
}
sizeLeft -= chunkSize;
// Skip any padding byte added to keep chunks aligned to even numbers of bytes
if (chunkSize % 2 == 1)
{
reader.GetSByte();
sizeLeft--;
}
}
}
Extract([NotNull] SequentialReader reader, int length)
{
var directory = new PhotoshopDirectory();
var directories = new List <Directory> {
directory
};
// Data contains a sequence of Image Resource Blocks (IRBs):
//
// 4 bytes - Signature "8BIM"
// 2 bytes - Resource identifier
// String - Pascal string, padded to make length even
// 4 bytes - Size of resource data which follows
// Data - The resource data, padded to make size even
//
// http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#50577409_pgfId-1037504
var pos = 0;
while (pos < length)
{
try
{
// 4 bytes for the signature. Should always be "8BIM".
var signature = reader.GetString(4);
pos += 4;
if (signature != "8BIM")
{
throw new ImageProcessingException("Expecting 8BIM marker");
}
// 2 bytes for the resource identifier (tag type).
var tagType = reader.GetUInt16();
pos += 2;
// A variable number of bytes holding a pascal string (two leading bytes for length).
var descriptionLength = reader.GetByte();
pos += 1;
// Some basic bounds checking
if (descriptionLength + pos > length)
{
throw new ImageProcessingException("Invalid string length");
}
// We don't use the string value here
reader.Skip(descriptionLength);
pos += descriptionLength;
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
reader.Skip(1);
pos++;
}
// 4 bytes for the size of the resource data that follows.
var byteCount = reader.GetInt32();
pos += 4;
// The resource data.
var tagBytes = reader.GetBytes(byteCount);
pos += byteCount;
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
reader.Skip(1);
pos++;
}
switch (tagType)
{
case PhotoshopDirectory.TagIptc:
directories.Add(new IptcReader().Extract(new SequentialByteArrayReader(tagBytes), tagBytes.Length));
break;
case PhotoshopDirectory.TagIccProfileBytes:
directories.Add(new IccReader().Extract(new ByteArrayReader(tagBytes)));
break;
case PhotoshopDirectory.TagExifData1:
case PhotoshopDirectory.TagExifData3:
directories.AddRange(new ExifReader().Extract(new ByteArrayReader(tagBytes)));
break;
case PhotoshopDirectory.TagXmpData:
directories.Add(new XmpReader().Extract(tagBytes));
break;
default:
directory.Set(tagType, tagBytes);
break;
}
if (tagType >= 0x0fa0 && tagType <= 0x1387)
{
PhotoshopDirectory.TagNameMap[tagType] = $"Plug-in {tagType - 0x0fa0 + 1} Data";
}
}
catch (Exception ex)
{
directory.AddError(ex.Message);
break;
}
}
return(directories);
}
public virtual void Extract(SequentialReader reader, Com.Drew.Metadata.Metadata metadata)
{
BmpHeaderDirectory directory = metadata.GetOrCreateDirectory <BmpHeaderDirectory>();
// FILE HEADER
//
// 2 - magic number (0x42 0x4D = "BM")
// 4 - size of BMP file in bytes
// 2 - reserved
// 2 - reserved
// 4 - the offset of the pixel array
//
// BITMAP INFORMATION HEADER
//
// The first four bytes of the header give the size, which is a discriminator of the actual header format.
// See this for more information http://en.wikipedia.org/wiki/BMP_file_format
//
// BITMAPINFOHEADER (size = 40)
//
// 4 - size of header
// 4 - pixel width (signed)
// 4 - pixel height (signed)
// 2 - number of colour planes (must be set to 1)
// 2 - number of bits per pixel
// 4 - compression being used (needs decoding)
// 4 - pixel data length (not total file size, just pixel array)
// 4 - horizontal resolution, pixels/meter (signed)
// 4 - vertical resolution, pixels/meter (signed)
// 4 - number of colours in the palette (0 means no palette)
// 4 - number of important colours (generally ignored)
//
// BITMAPCOREHEADER (size = 12)
//
// 4 - size of header
// 2 - pixel width
// 2 - pixel height
// 2 - number of colour planes (must be set to 1)
// 2 - number of bits per pixel
//
// COMPRESSION VALUES
//
// 0 = None
// 1 = RLE 8-bit/pixel
// 2 = RLE 4-bit/pixel
// 3 = Bit field (or Huffman 1D if BITMAPCOREHEADER2 (size 64))
// 4 = JPEG (or RLE-24 if BITMAPCOREHEADER2 (size 64))
// 5 = PNG
// 6 = Bit field
reader.SetMotorolaByteOrder(false);
try
{
int magicNumber = reader.GetUInt16();
if (magicNumber != unchecked ((int)(0x4D42)))
{
directory.AddError("Invalid BMP magic number");
return;
}
// skip past the rest of the file header
reader.Skip(4 + 2 + 2 + 4);
int headerSize = reader.GetInt32();
directory.SetInt(BmpHeaderDirectory.TagHeaderSize, headerSize);
// We expect the header size to be either 40 (BITMAPINFOHEADER) or 12 (BITMAPCOREHEADER)
if (headerSize == 40)
{
// BITMAPINFOHEADER
directory.SetInt(BmpHeaderDirectory.TagImageWidth, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagImageHeight, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagColourPlanes, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagBitsPerPixel, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagCompression, reader.GetInt32());
// skip the pixel data length
reader.Skip(4);
directory.SetInt(BmpHeaderDirectory.TagXPixelsPerMeter, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagYPixelsPerMeter, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagPaletteColourCount, reader.GetInt32());
directory.SetInt(BmpHeaderDirectory.TagImportantColourCount, reader.GetInt32());
}
else
{
if (headerSize == 12)
{
directory.SetInt(BmpHeaderDirectory.TagImageWidth, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagImageHeight, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagColourPlanes, reader.GetInt16());
directory.SetInt(BmpHeaderDirectory.TagBitsPerPixel, reader.GetInt16());
}
else
{
directory.AddError("Unexpected DIB header size: " + headerSize);
}
}
}
catch (IOException)
{
directory.AddError("Unable to read BMP header");
}
}
/// <exception cref="Com.Drew.Imaging.Png.PngProcessingException"/>
/// <exception cref="System.IO.IOException"/>
public virtual Iterable <PngChunk> Extract(SequentialReader reader, ICollection <PngChunkType> desiredChunkTypes)
{
//
// PNG DATA STREAM
//
// Starts with a PNG SIGNATURE, followed by a sequence of CHUNKS.
//
// PNG SIGNATURE
//
// Always composed of these bytes: 89 50 4E 47 0D 0A 1A 0A
//
// CHUNK
//
// 4 - length of the data field (unsigned, but always within 31 bytes), may be zero
// 4 - chunk type, restricted to [65,90] and [97,122] (A-Za-z)
// * - data field
// 4 - CRC calculated from chunk type and chunk data, but not length
//
// CHUNK TYPES
//
// Critical Chunk Types:
//
// IHDR - image header, always the first chunk in the data stream
// PLTE - palette table, associated with indexed PNG images
// IDAT - image data chunk, of which there may be many
// IEND - image trailer, always the last chunk in the data stream
//
// Ancillary Chunk Types:
//
// Transparency information: tRNS
// Colour space information: cHRM, gAMA, iCCP, sBIT, sRGB
// Textual information: iTXt, tEXt, zTXt
// Miscellaneous information: bKGD, hIST, pHYs, sPLT
// Time information: tIME
//
reader.SetMotorolaByteOrder(true);
// network byte order
if (!Arrays.Equals(PngSignatureBytes, reader.GetBytes(PngSignatureBytes.Length)))
{
throw new PngProcessingException("PNG signature mismatch");
}
bool seenImageHeader = false;
bool seenImageTrailer = false;
IList <PngChunk> chunks = new AList <PngChunk>();
ICollection <PngChunkType> seenChunkTypes = new HashSet <PngChunkType>();
while (!seenImageTrailer)
{
// Process the next chunk.
int chunkDataLength = reader.GetInt32();
PngChunkType chunkType = new PngChunkType(reader.GetBytes(4));
sbyte[] chunkData = reader.GetBytes(chunkDataLength);
// Skip the CRC bytes at the end of the chunk
// TODO consider verifying the CRC value to determine if we're processing bad data
reader.Skip(4);
if (seenChunkTypes.Contains(chunkType) && !chunkType.AreMultipleAllowed())
{
throw new PngProcessingException(Sharpen.Extensions.StringFormat("Observed multiple instances of PNG chunk '%s', for which multiples are not allowed", chunkType));
}
if (chunkType.Equals(PngChunkType.Ihdr))
{
seenImageHeader = true;
}
else
{
if (!seenImageHeader)
{
throw new PngProcessingException(Sharpen.Extensions.StringFormat("First chunk should be '%s', but '%s' was observed", PngChunkType.Ihdr, chunkType));
}
}
if (chunkType.Equals(PngChunkType.Iend))
{
seenImageTrailer = true;
}
if (desiredChunkTypes == null || desiredChunkTypes.Contains(chunkType))
{
chunks.Add(new PngChunk(chunkType, chunkData));
}
seenChunkTypes.Add(chunkType);
}
return(chunks.AsIterable());
}
public DirectoryList Extract(SequentialReader reader)
{
var directory = new PsdHeaderDirectory();
// FILE HEADER SECTION
try
{
var signature = reader.GetInt32();
var version = reader.GetUInt16();
if (signature != 0x38425053)
{
// "8BPS"
directory.AddError("Invalid PSD file signature");
}
else if (version != 1 && version != 2)
{
directory.AddError("Invalid PSD file version (must be 1 or 2)");
}
else
{
// 6 reserved bytes are skipped here. They should be zero.
reader.Skip(6);
var channelCount = reader.GetUInt16();
directory.Set(PsdHeaderDirectory.TagChannelCount, channelCount);
// even though this is probably an unsigned int, the max height in practice is 300,000
var imageHeight = reader.GetInt32();
directory.Set(PsdHeaderDirectory.TagImageHeight, imageHeight);
// even though this is probably an unsigned int, the max width in practice is 300,000
var imageWidth = reader.GetInt32();
directory.Set(PsdHeaderDirectory.TagImageWidth, imageWidth);
var bitsPerChannel = reader.GetUInt16();
directory.Set(PsdHeaderDirectory.TagBitsPerChannel, bitsPerChannel);
var colorMode = reader.GetUInt16();
directory.Set(PsdHeaderDirectory.TagColorMode, colorMode);
}
}
catch (IOException)
{
directory.AddError("Unable to read PSD header");
}
if (directory.HasError)
{
return new Directory[] { directory }
}
;
IEnumerable <Directory>?photoshopDirectories = null;
try
{
// COLOR MODE DATA SECTION
// Only indexed color and duotone (see the mode field in the File header section) have color mode data.
// For all other modes, this section is just the 4-byte length field, which is set to zero.
//
// Indexed color images: length is 768; color data contains the color table for the image,
// in non-interleaved order.
// Duotone images: color data contains the duotone specification (the format of which is not documented).
// Other applications that read Photoshop files can treat a duotone image as a gray image,
// and just preserve the contents of the duotone information when reading and writing the
// file.
var colorModeSectionLength = reader.GetUInt32();
reader.Skip(colorModeSectionLength);
// IMAGE RESOURCES SECTION
var imageResourcesSectionLength = reader.GetUInt32();
Debug.Assert(imageResourcesSectionLength <= int.MaxValue);
photoshopDirectories = new PhotoshopReader().Extract(reader, (int)imageResourcesSectionLength);
}
catch (IOException)
{
}
var directories = new List <Directory> {
directory
};
if (photoshopDirectories != null)
{
directories.AddRange(photoshopDirectories);
}
// LAYER AND MASK INFORMATION SECTION (skipped)
// IMAGE DATA SECTION (skipped)
return(directories);
}
}
// PROCESS CHUNKS
public void ProcessChunks([NotNull] SequentialReader reader, int sizeLeft, [NotNull] IRiffHandler handler)
{
// Processing chunks. Each chunk is 8 bytes header (4 bytes CC code + 4 bytes length of chunk) + data of the chunk
while (reader.Position < sizeLeft)
{
// Check if end of the file is closer then 8 bytes
if (reader.IsCloserToEnd(8))
{
return;
}
string chunkFourCc = reader.GetString(4, Encoding.ASCII);
int chunkSize = reader.GetInt32();
sizeLeft -= 8;
// NOTE we fail a negative chunk size here (greater than 0x7FFFFFFF) as we cannot allocate arrays larger than this
if (chunkSize < 0 || sizeLeft < chunkSize)
{
throw new RiffProcessingException("Invalid RIFF chunk size");
}
// Check if end of the file is closer then chunkSize bytes
if (reader.IsCloserToEnd(chunkSize))
{
return;
}
if (chunkFourCc == "LIST" || chunkFourCc == "RIFF")
{
string listName = reader.GetString(4, Encoding.ASCII);
if (handler.ShouldAcceptList(listName))
{
ProcessChunks(reader, sizeLeft - 4, handler);
}
else
{
reader.Skip(sizeLeft - 4);
}
sizeLeft -= chunkSize;
}
else
{
if (handler.ShouldAcceptChunk(chunkFourCc))
{
// TODO is it feasible to avoid copying the chunk here, and to pass the sequential reader to the handler?
handler.ProcessChunk(chunkFourCc, reader.GetBytes(chunkSize));
}
else
{
reader.Skip(chunkSize);
}
sizeLeft -= chunkSize;
// Skip any padding byte added to keep chunks aligned to even numbers of bytes
if (chunkSize % 2 == 1)
{
reader.GetSByte();
sizeLeft--;
}
}
}
}
// http://id3.org/mp3Frame
// https://www.loc.gov/preservation/digital/formats/fdd/fdd000105.shtml
public Directory Extract(SequentialReader reader)
{
var directory = new Mp3Directory();
var header = reader.GetInt32();
// ID: MPEG-2.5, MPEG-2, or MPEG-1
int id = 0;
switch ((header & 0x000180000) >> 19)
{
case 0:
throw new ImageProcessingException("MPEG-2.5 not supported.");
case 2:
directory.Set(Mp3Directory.TAG_ID, "MPEG-2");
id = 2;
break;
case 3:
directory.Set(Mp3Directory.TAG_ID, "MPEG-1");
id = 1;
break;
}
// Layer Type: 1, 2, 3, or not defined
int layer = (header & 0x00060000) >> 17;
switch (layer)
{
case 0:
directory.Set(Mp3Directory.TAG_LAYER, "Not defined");
break;
case 1:
directory.Set(Mp3Directory.TAG_LAYER, "Layer III");
break;
case 2:
directory.Set(Mp3Directory.TAG_LAYER, "Layer II");
break;
case 3:
directory.Set(Mp3Directory.TAG_LAYER, "Layer I");
break;
}
int protectionBit = (header & 0x00010000) >> 16;
// Bitrate: depends on ID and Layer
int bitrate = (header & 0x0000F000) >> 12;
if (bitrate != 0 && bitrate != 15)
{
directory.Set(Mp3Directory.TAG_BITRATE, SetBitrate(bitrate, layer, id));
}
// Frequency: depends on ID
int frequency = (header & 0x00000C00) >> 10;
int[,] frequencyMapping = new int[2, 3]
{
{ 44100, 48000, 32000 },
{ 22050, 24000, 16000 }
};
if (id == 1)
{
directory.Set(Mp3Directory.TAG_FREQUENCY, frequencyMapping[0, frequency]);
frequency = frequencyMapping[0, frequency];
}
else if (id == 2)
{
directory.Set(Mp3Directory.TAG_FREQUENCY, frequencyMapping[1, frequency]);
frequency = frequencyMapping[1, frequency];
}
int paddingBit = (header & 0x00000200) >> 9;
// Encoding type: Stereo, Joint Stereo, Dual Channel, or Mono
int mode = (header & 0x000000C0) >> 6;
switch (mode)
{
case 0:
directory.Set(Mp3Directory.TAG_MODE, "Stereo");
break;
case 1:
directory.Set(Mp3Directory.TAG_MODE, "Joint stereo");
break;
case 2:
directory.Set(Mp3Directory.TAG_MODE, "Dual channel");
break;
case 3:
directory.Set(Mp3Directory.TAG_MODE, "Mono");
break;
}
// Copyright boolean
int copyright = (header & 0x00000008) >> 3;
switch (copyright)
{
case 0:
directory.Set(Mp3Directory.TAG_COPYRIGHT, "False");
break;
case 1:
directory.Set(Mp3Directory.TAG_COPYRIGHT, "True");
break;
}
int emphasis = header & 0x00000003;
switch (emphasis)
{
case 0:
directory.Set(Mp3Directory.TAG_EMPHASIS, "none");
break;
case 1:
directory.Set(Mp3Directory.TAG_EMPHASIS, "50/15ms");
break;
case 3:
directory.Set(Mp3Directory.TAG_EMPHASIS, "CCITT j.17");
break;
}
int frameSize = SetBitrate(bitrate, layer, id) * 1000 * 144 / frequency;
directory.Set(Mp3Directory.TAG_FRAME_SIZE, frameSize + " bytes");
return(directory);
}
public virtual void Extract([NotNull] SequentialReader reader, int length, [NotNull] Com.Drew.Metadata.Metadata metadata)
{
PhotoshopDirectory directory = new PhotoshopDirectory();
metadata.AddDirectory(directory);
// Data contains a sequence of Image Resource Blocks (IRBs):
//
// 4 bytes - Signature "8BIM"
// 2 bytes - Resource identifier
// String - Pascal string, padded to make length even
// 4 bytes - Size of resource data which follows
// Data - The resource data, padded to make size even
//
// http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#50577409_pgfId-1037504
int pos = 0;
while (pos < length)
{
try
{
// 4 bytes for the signature. Should always be "8BIM".
string signature = reader.GetString(4);
if (!signature.Equals("8BIM"))
{
throw new ImageProcessingException("Expecting 8BIM marker");
}
pos += 4;
// 2 bytes for the resource identifier (tag type).
int tagType = reader.GetUInt16();
// segment type
pos += 2;
// A variable number of bytes holding a pascal string (two leading bytes for length).
short descriptionLength = reader.GetUInt8();
pos += 1;
// Some basic bounds checking
if (descriptionLength < 0 || descriptionLength + pos > length)
{
throw new ImageProcessingException("Invalid string length");
}
// We don't use the string value here
reader.Skip(descriptionLength);
pos += descriptionLength;
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
reader.Skip(1);
pos++;
}
// 4 bytes for the size of the resource data that follows.
int byteCount = reader.GetInt32();
pos += 4;
// The resource data.
sbyte[] tagBytes = reader.GetBytes(byteCount);
pos += byteCount;
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
reader.Skip(1);
pos++;
}
if (tagType == PhotoshopDirectory.TagIptc)
{
new IptcReader().Extract(new SequentialByteArrayReader(tagBytes), metadata, tagBytes.Length);
}
else
{
if (tagType == PhotoshopDirectory.TagIccProfileBytes)
{
new IccReader().Extract(new ByteArrayReader(tagBytes), metadata);
}
else
{
if (tagType == PhotoshopDirectory.TagExifData1 || tagType == PhotoshopDirectory.TagExifData3)
{
new ExifReader().Extract(new ByteArrayReader(tagBytes), metadata);
}
else
{
if (tagType == PhotoshopDirectory.TagXmpData)
{
new XmpReader().Extract(tagBytes, metadata);
}
else
{
directory.SetByteArray(tagType, tagBytes);
}
}
}
}
if (tagType >= unchecked ((int)(0x0fa0)) && tagType <= unchecked ((int)(0x1387)))
{
PhotoshopDirectory._tagNameMap.Put(tagType, Sharpen.Extensions.StringFormat("Plug-in %d Data", tagType - unchecked ((int)(0x0fa0)) + 1));
}
}
catch (Exception ex)
{
directory.AddError(ex.Message);
return;
}
}
}
public DirectoryList Extract(SequentialReader reader, int length)
{
var directory = new PhotoshopDirectory();
var directories = new List <Directory> {
directory
};
// Data contains a sequence of Image Resource Blocks (IRBs):
//
// 4 bytes - Signature; mostly "8BIM" but "PHUT", "AgHg" and "DCSR" are also found
// 2 bytes - Resource identifier
// String - Pascal string, padded to make length even
// 4 bytes - Size of resource data which follows
// Data - The resource data, padded to make size even
//
// http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#50577409_pgfId-1037504
var pos = 0;
while (pos < length)
{
try
{
// 4 bytes for the signature ("8BIM", "PHUT", etc.)
var signature = reader.GetString(4, Encoding.UTF8);
pos += 4;
// 2 bytes for the resource identifier (tag type).
var tagType = reader.GetUInt16();
pos += 2;
// A variable number of bytes holding a pascal string (two leading bytes for length).
var descriptionLength = reader.GetByte();
pos += 1;
// Some basic bounds checking
if (descriptionLength + pos > length)
{
throw new ImageProcessingException("Invalid string length");
}
// We don't use the string value here
reader.Skip(descriptionLength);
pos += descriptionLength;
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
reader.Skip(1);
pos++;
}
// 4 bytes for the size of the resource data that follows.
var byteCount = reader.GetInt32();
pos += 4;
// The resource data.
var tagBytes = reader.GetBytes(byteCount);
pos += byteCount;
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
reader.Skip(1);
pos++;
}
// Skip any unsupported IRBs
if (signature != "8BIM")
{
continue;
}
switch (tagType)
{
case PhotoshopDirectory.TagIptc:
var iptcDirectory = new IptcReader().Extract(new SequentialByteArrayReader(tagBytes), tagBytes.Length);
iptcDirectory.Parent = directory;
directories.Add(iptcDirectory);
break;
case PhotoshopDirectory.TagIccProfileBytes:
var iccDirectory = new IccReader().Extract(new ByteArrayReader(tagBytes));
iccDirectory.Parent = directory;
directories.Add(iccDirectory);
break;
case PhotoshopDirectory.TagExifData1:
case PhotoshopDirectory.TagExifData3:
var exifDirectories = new ExifReader().Extract(new ByteArrayReader(tagBytes));
foreach (var exifDirectory in exifDirectories.Where(d => d.Parent == null))
{
exifDirectory.Parent = directory;
}
directories.AddRange(exifDirectories);
break;
case PhotoshopDirectory.TagXmpData:
var xmpDirectory = new XmpReader().Extract(tagBytes);
xmpDirectory.Parent = directory;
directories.Add(xmpDirectory);
break;
default:
directory.Set(tagType, tagBytes);
break;
}
if (tagType >= 0x0fa0 && tagType <= 0x1387)
{
PhotoshopDirectory.TagNameMap[tagType] = $"Plug-in {tagType - 0x0fa0 + 1} Data";
}
}
catch (Exception ex)
{
directory.AddError(ex.Message);
break;
}
}
return(directories);
}
public DirectoryList Extract(SequentialReader reader, int length)
{
var directory = new PhotoshopDirectory();
var directories = new List <Directory> {
directory
};
// Data contains a sequence of Image Resource Blocks (IRBs):
//
// 4 bytes - Signature; mostly "8BIM" but "PHUT", "AgHg" and "DCSR" are also found
// 2 bytes - Resource identifier
// String - Pascal string, padded to make length even
// 4 bytes - Size of resource data which follows
// Data - The resource data, padded to make size even
//
// http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#50577409_pgfId-1037504
var pos = 0;
int clippingPathCount = 0;
while (pos < length)
{
try
{
// 4 bytes for the signature ("8BIM", "PHUT", etc.)
var signature = reader.GetString(4, Encoding.UTF8);
pos += 4;
// 2 bytes for the resource identifier (tag type).
var tagType = reader.GetUInt16();
pos += 2;
// A variable number of bytes holding a pascal string (two leading bytes for length).
var descriptionLength = reader.GetByte();
pos += 1;
// Some basic bounds checking
if (descriptionLength + pos > length)
{
throw new ImageProcessingException("Invalid string length");
}
// Get name (important for paths)
var description = new StringBuilder();
// Loop through each byte and append to string
while (descriptionLength > 0)
{
description.Append((char)reader.GetByte());
pos++;
descriptionLength--;
}
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
reader.Skip(1);
pos++;
}
// 4 bytes for the size of the resource data that follows.
var byteCount = reader.GetInt32();
pos += 4;
// The resource data.
var tagBytes = reader.GetBytes(byteCount);
pos += byteCount;
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
reader.Skip(1);
pos++;
}
// Skip any unsupported IRBs
if (signature != "8BIM")
{
continue;
}
switch (tagType)
{
case PhotoshopDirectory.TagIptc:
var iptcDirectory = new IptcReader().Extract(new SequentialByteArrayReader(tagBytes), tagBytes.Length);
iptcDirectory.Parent = directory;
directories.Add(iptcDirectory);
break;
case PhotoshopDirectory.TagIccProfileBytes:
var iccDirectory = new IccReader().Extract(new ByteArrayReader(tagBytes));
iccDirectory.Parent = directory;
directories.Add(iccDirectory);
break;
case PhotoshopDirectory.TagExifData1:
case PhotoshopDirectory.TagExifData3:
var exifDirectories = new ExifReader().Extract(new ByteArrayReader(tagBytes));
foreach (var exifDirectory in exifDirectories.Where(d => d.Parent == null))
{
exifDirectory.Parent = directory;
}
directories.AddRange(exifDirectories);
break;
case PhotoshopDirectory.TagXmpData:
var xmpDirectory = new XmpReader().Extract(tagBytes);
xmpDirectory.Parent = directory;
directories.Add(xmpDirectory);
break;
default:
if (tagType >= PhotoshopDirectory.TagClippingPathBlockStart && tagType <= PhotoshopDirectory.TagClippingPathBlockEnd)
{
clippingPathCount++;
Array.Resize(ref tagBytes, tagBytes.Length + description.Length + 1);
// Append description(name) to end of byte array with 1 byte before the description representing the length
for (int i = tagBytes.Length - description.Length - 1; i < tagBytes.Length; i++)
{
if (i % (tagBytes.Length - description.Length - 1 + description.Length) == 0)
{
tagBytes[i] = (byte)description.Length;
}
else
{
tagBytes[i] = (byte)description[i - (tagBytes.Length - description.Length - 1)];
}
}
PhotoshopDirectory.TagNameMap[PhotoshopDirectory.TagClippingPathBlockStart + clippingPathCount - 1] = "Path Info " + clippingPathCount;
directory.Set(PhotoshopDirectory.TagClippingPathBlockStart + clippingPathCount - 1, tagBytes);
}
else
{
directory.Set(tagType, tagBytes);
}
break;
}
if (tagType >= 0x0fa0 && tagType <= 0x1387)
{
PhotoshopDirectory.TagNameMap[tagType] = $"Plug-in {tagType - 0x0fa0 + 1} Data";
}
}
catch (Exception ex)
{
directory.AddError(ex.Message);
break;
}
}
return(directories);
}
private static void ReadBitmapHeader(SequentialReader reader, BmpHeaderDirectory directory, List <Directory> directories)
{
/*
* BITMAPCOREHEADER (12 bytes):
*
* DWORD Size - Size of this header in bytes
* SHORT Width - Image width in pixels
* SHORT Height - Image height in pixels
* WORD Planes - Number of color planes
* WORD BitsPerPixel - Number of bits per pixel
*
* OS21XBITMAPHEADER (12 bytes):
*
* DWORD Size - Size of this structure in bytes
* WORD Width - Bitmap width in pixels
* WORD Height - Bitmap height in pixel
* WORD NumPlanes - Number of bit planes (color depth)
* WORD BitsPerPixel - Number of bits per pixel per plane
*
* OS22XBITMAPHEADER (16/64 bytes):
*
* DWORD Size - Size of this structure in bytes
* DWORD Width - Bitmap width in pixels
* DWORD Height - Bitmap height in pixel
* WORD NumPlanes - Number of bit planes (color depth)
* WORD BitsPerPixel - Number of bits per pixel per plane
*
* - Short version ends here -
*
* DWORD Compression - Bitmap compression scheme
* DWORD ImageDataSize - Size of bitmap data in bytes
* DWORD XResolution - X resolution of display device
* DWORD YResolution - Y resolution of display device
* DWORD ColorsUsed - Number of color table indices used
* DWORD ColorsImportant - Number of important color indices
* WORD Units - Type of units used to measure resolution
* WORD Reserved - Pad structure to 4-byte boundary
* WORD Recording - Recording algorithm
* WORD Rendering - Halftoning algorithm used
* DWORD Size1 - Reserved for halftoning algorithm use
* DWORD Size2 - Reserved for halftoning algorithm use
* DWORD ColorEncoding - Color model used in bitmap
* DWORD Identifier - Reserved for application use
*
* BITMAPINFOHEADER (40 bytes), BITMAPV2INFOHEADER (52 bytes), BITMAPV3INFOHEADER (56 bytes),
* BITMAPV4HEADER (108 bytes) and BITMAPV5HEADER (124 bytes):
*
* DWORD Size - Size of this header in bytes
* LONG Width - Image width in pixels
* LONG Height - Image height in pixels
* WORD Planes - Number of color planes
* WORD BitsPerPixel - Number of bits per pixel
* DWORD Compression - Compression methods used
* DWORD SizeOfBitmap - Size of bitmap in bytes
* LONG HorzResolution - Horizontal resolution in pixels per meter
* LONG VertResolution - Vertical resolution in pixels per meter
* DWORD ColorsUsed - Number of colors in the image
* DWORD ColorsImportant - Minimum number of important colors
*
* - BITMAPINFOHEADER ends here -
*
* DWORD RedMask - Mask identifying bits of red component
* DWORD GreenMask - Mask identifying bits of green component
* DWORD BlueMask - Mask identifying bits of blue component
*
* - BITMAPV2INFOHEADER ends here -
*
* DWORD AlphaMask - Mask identifying bits of alpha component
*
* - BITMAPV3INFOHEADER ends here -
*
* DWORD CSType - Color space type
* LONG RedX - X coordinate of red endpoint
* LONG RedY - Y coordinate of red endpoint
* LONG RedZ - Z coordinate of red endpoint
* LONG GreenX - X coordinate of green endpoint
* LONG GreenY - Y coordinate of green endpoint
* LONG GreenZ - Z coordinate of green endpoint
* LONG BlueX - X coordinate of blue endpoint
* LONG BlueY - Y coordinate of blue endpoint
* LONG BlueZ - Z coordinate of blue endpoint
* DWORD GammaRed - Gamma red coordinate scale value
* DWORD GammaGreen - Gamma green coordinate scale value
* DWORD GammaBlue - Gamma blue coordinate scale value
*
* - BITMAPV4HEADER ends here -
*
* DWORD Intent - Rendering intent for bitmap
* DWORD ProfileData - Offset of the profile data relative to BITMAPV5HEADER
* DWORD ProfileSize - Size, in bytes, of embedded profile data
* DWORD Reserved - Shall be zero
*
*/
try
{
int bitmapType = directory.GetInt32(BmpHeaderDirectory.TagBitmapType);
long headerOffset = reader.Position;
int headerSize = reader.GetInt32();
directory.Set(BmpHeaderDirectory.TagHeaderSize, headerSize);
/*
* Known header type sizes:
*
* 12 - BITMAPCOREHEADER or OS21XBITMAPHEADER
* 16 - OS22XBITMAPHEADER (short)
* 40 - BITMAPINFOHEADER
* 52 - BITMAPV2INFOHEADER
* 56 - BITMAPV3INFOHEADER
* 64 - OS22XBITMAPHEADER (full)
* 108 - BITMAPV4HEADER
* 124 - BITMAPV5HEADER
*
*/
if (headerSize == 12 && bitmapType == (int)BmpHeaderDirectory.BitmapType.Bitmap)
{
//BITMAPCOREHEADER
/*
* There's no way to tell BITMAPCOREHEADER and OS21XBITMAPHEADER
* apart for the "standard" bitmap type. The difference is only
* that BITMAPCOREHEADER has signed width and height while
* in OS21XBITMAPHEADER they are unsigned. Since BITMAPCOREHEADER,
* the Windows version, is most common, read them as signed.
*/
directory.Set(BmpHeaderDirectory.TagImageWidth, reader.GetInt16());
directory.Set(BmpHeaderDirectory.TagImageHeight, reader.GetInt16());
directory.Set(BmpHeaderDirectory.TagColourPlanes, reader.GetUInt16());
directory.Set(BmpHeaderDirectory.TagBitsPerPixel, reader.GetUInt16());
}
else if (headerSize == 12)
{
// OS21XBITMAPHEADER
directory.Set(BmpHeaderDirectory.TagImageWidth, reader.GetUInt16());
directory.Set(BmpHeaderDirectory.TagImageHeight, reader.GetUInt16());
directory.Set(BmpHeaderDirectory.TagColourPlanes, reader.GetUInt16());
directory.Set(BmpHeaderDirectory.TagBitsPerPixel, reader.GetUInt16());
}
else if (headerSize == 16 || headerSize == 64)
{
// OS22XBITMAPHEADER
directory.Set(BmpHeaderDirectory.TagImageWidth, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagImageHeight, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagColourPlanes, reader.GetUInt16());
directory.Set(BmpHeaderDirectory.TagBitsPerPixel, reader.GetUInt16());
if (headerSize > 16)
{
directory.Set(BmpHeaderDirectory.TagCompression, reader.GetInt32());
reader.Skip(4); // skip the pixel data length
directory.Set(BmpHeaderDirectory.TagXPixelsPerMeter, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagYPixelsPerMeter, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagPaletteColourCount, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagImportantColourCount, reader.GetInt32());
reader.Skip(
2 + // Skip Units, can only be 0 (pixels per meter)
2 + // Skip padding
2 // Skip Recording, can only be 0 (left to right, bottom to top)
);
directory.Set(BmpHeaderDirectory.TagRendering, reader.GetUInt16());
reader.Skip(4 + 4); // Skip Size1 and Size2
directory.Set(BmpHeaderDirectory.TagColorEncoding, reader.GetInt32());
reader.Skip(4); // Skip Identifier
}
}
else if (
headerSize == 40 || headerSize == 52 || headerSize == 56 ||
headerSize == 108 || headerSize == 124)
{
// BITMAPINFOHEADER V1-5
directory.Set(BmpHeaderDirectory.TagImageWidth, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagImageHeight, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagColourPlanes, reader.GetUInt16());
directory.Set(BmpHeaderDirectory.TagBitsPerPixel, reader.GetUInt16());
directory.Set(BmpHeaderDirectory.TagCompression, reader.GetInt32());
// skip the pixel data length
reader.Skip(4);
directory.Set(BmpHeaderDirectory.TagXPixelsPerMeter, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagYPixelsPerMeter, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagPaletteColourCount, reader.GetInt32());
directory.Set(BmpHeaderDirectory.TagImportantColourCount, reader.GetInt32());
if (headerSize == 40)
{
// BITMAPINFOHEADER end
return;
}
directory.Set(BmpHeaderDirectory.TagRedMask, reader.GetUInt32());
directory.Set(BmpHeaderDirectory.TagGreenMask, reader.GetUInt32());
directory.Set(BmpHeaderDirectory.TagBlueMask, reader.GetUInt32());
if (headerSize == 52)
{
// BITMAPV2INFOHEADER end
return;
}
directory.Set(BmpHeaderDirectory.TagAlphaMask, reader.GetUInt32());
if (headerSize == 56)
{
// BITMAPV3INFOHEADER end
return;
}
long csType = reader.GetUInt32();
directory.Set(BmpHeaderDirectory.TagColorSpaceType, csType);
reader.Skip(36); // Skip color endpoint coordinates
directory.Set(BmpHeaderDirectory.TagGammaRed, reader.GetUInt32());
directory.Set(BmpHeaderDirectory.TagGammaGreen, reader.GetUInt32());
directory.Set(BmpHeaderDirectory.TagGammaBlue, reader.GetUInt32());
if (headerSize == 108)
{
// BITMAPV4HEADER end
return;
}
directory.Set(BmpHeaderDirectory.TagIntent, reader.GetInt32());
if (csType == (long)BmpHeaderDirectory.ColorSpaceType.ProfileEmbedded || csType == (long)BmpHeaderDirectory.ColorSpaceType.ProfileLinked)
{
long profileOffset = reader.GetUInt32();
int profileSize = reader.GetInt32();
if (reader.Position > headerOffset + profileOffset)
{
directory.AddError("Invalid profile data offset 0x" + (headerOffset + profileOffset).ToString("X8"));
return;
}
reader.Skip(headerOffset + profileOffset - reader.Position);
if (csType == (long)BmpHeaderDirectory.ColorSpaceType.ProfileLinked)
{
directory.Set(BmpHeaderDirectory.TagLinkedProfile, reader.GetNullTerminatedString(profileSize, Encoding.GetEncoding(1252)));
}
else
{
var iccReader = new ByteArrayReader(reader.GetBytes(profileSize));
var iccDirectory = new IccReader().Extract(iccReader);
iccDirectory.Parent = directory;
directories.Add(iccDirectory);
}
}
else
{
reader.Skip(
4 + // Skip ProfileData offset
4 + // Skip ProfileSize
4 // Skip Reserved
);
}
}
else
{
directory.AddError("Unexpected DIB header size: " + headerSize);
}
}
catch (IOException)
{
directory.AddError("Unable to read BMP header");
}
catch (MetadataException)
{
directory.AddError("Internal error");
}
}