public virtual void Extract(RandomAccessReader reader, Com.Drew.Metadata.Metadata metadata)
{
PsdHeaderDirectory directory = metadata.GetOrCreateDirectory <PsdHeaderDirectory>();
try
{
int signature = reader.GetInt32(0);
if (signature != unchecked ((int)(0x38425053)))
{
directory.AddError("Invalid PSD file signature");
return;
}
int version = reader.GetUInt16(4);
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.
int channelCount = reader.GetUInt16(12);
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(14);
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(18);
directory.SetInt(PsdHeaderDirectory.TagImageWidth, imageWidth);
int bitsPerChannel = reader.GetUInt16(22);
directory.SetInt(PsdHeaderDirectory.TagBitsPerChannel, bitsPerChannel);
int colorMode = reader.GetUInt16(24);
directory.SetInt(PsdHeaderDirectory.TagColorMode, colorMode);
}
catch (IOException)
{
directory.AddError("Unable to read PSD header");
}
}
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 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)
{
}
}