public virtual void Extract(RandomAccessReader reader, Com.Drew.Metadata.Metadata metadata)
{
PhotoshopDirectory directory = metadata.GetOrCreateDirectory <PhotoshopDirectory>();
int pos;
try
{
pos = reader.GetString(0, 13).Equals("Photoshop 3.0") ? 14 : 0;
}
catch (IOException)
{
directory.AddError("Unable to read header");
return;
}
long length;
try
{
length = reader.GetLength();
}
catch (IOException e)
{
directory.AddError("Unable to read Photoshop data: " + e.Message);
return;
}
while (pos < length)
{
try
{
// 4 bytes for the signature. Should always be "8BIM".
//String signature = new String(data, pos, 4);
pos += 4;
// 2 bytes for the resource identifier (tag type).
int tagType = reader.GetUInt16(pos);
// segment type
pos += 2;
// A variable number of bytes holding a pascal string (two leading bytes for length).
int descriptionLength = reader.GetUInt16(pos);
pos += 2;
// Some basic bounds checking
if (descriptionLength < 0 || descriptionLength + pos > length)
{
return;
}
//String description = new String(data, pos, descriptionLength);
pos += descriptionLength;
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
pos++;
}
// 4 bytes for the size of the resource data that follows.
int byteCount = reader.GetInt32(pos);
pos += 4;
// The resource data.
sbyte[] tagBytes = reader.GetBytes(pos, byteCount);
pos += byteCount;
// The number of bytes is padded with a trailing zero, if needed, to make the size even.
if (pos % 2 != 0)
{
pos++;
}
directory.SetByteArray(tagType, tagBytes);
// TODO allow rebasing the reader with a new zero-point, rather than copying data here
if (tagType == PhotoshopDirectory.TagIptc)
{
new IptcReader().Extract(new SequentialByteArrayReader(tagBytes), metadata, tagBytes.Length);
}
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 (IOException ex)
{
directory.AddError(ex.Message);
return;
}
}
}
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 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;
}
}
}
