private void ReadAPP13Segment(ushort length)
{
var data = ReadBlock(length);
var iptc_iim_length = IPTC_IIM_IDENTIFIER.Length;
if (length < iptc_iim_length || data.Mid(0, iptc_iim_length) != IPTC_IIM_IDENTIFIER)
{
return;
}
var headerInfoLen = data.Mid(iptc_iim_length, 1).ToUShort();
int lenToSkip;
if (headerInfoLen > 0)
{
lenToSkip = 1 + headerInfoLen + 4;
}
else
{
lenToSkip = 6;
}
data.RemoveRange(0, iptc_iim_length + lenToSkip);
var reader = new IIM.IIMReader(data);
var tag = reader.Process();
if (tag != null)
{
ImageTag.AddTag(tag);
}
}
/// <summary>
/// Reads an APP13 segment to find IPTC-IIM metadata.
/// </summary>
/// <param name="length">
/// The length of the segment that will be read.
/// </param>
/// <remarks>More info and specs for IPTC-IIM:
/// - Guidelines for Handling Image Metadata (http://www.metadataworkinggroup.org/specs/)
/// - IPTC Standard Photo Metadata (July 2010) (http://www.iptc.org/std/photometadata/specification/IPTC-PhotoMetadata-201007_1.pdf)
/// - Extracting IPTC header information from JPEG images (http://www.codeproject.com/KB/graphics/iptc.aspx?fid=2301&df=90&mpp=25&noise=3&prof=False&sort=Position&view=Quick&fr=51#xx0xx)
/// - Reading IPTC APP14 Segment Header Information from JPEG Images (http://www.codeproject.com/KB/graphics/ReadingIPTCAPP14.aspx?q=iptc)
/// </remarks>
private void ReadAPP13Segment(ushort length)
{
// TODO: if both IPTC-IIM and XMP metadata is contained in a file, we should read
// a IPTC-IIM checksum and compare that with the checksum built over the IIM block.
// Depending on the result we should prefer the information from XMP or IIM.
// Right now we always prefer XMP.
var data = ReadBlock(length);
// The APP13 segment consists of:
// - the string "Photoshop 3.0\u0000"
// - followed by "8BIM"
// - and then the section type "\u0004\u0004".
// There might be multiple 8BIM sections with different types, but we're following
// YAGNI for now and only deal with the one we're interested in (and hope that it's
// the first one).
var iptc_iim_length = IPTC_IIM_IDENTIFIER.Length;
if (length < iptc_iim_length || data.Mid(0, iptc_iim_length) != IPTC_IIM_IDENTIFIER)
{
return;
}
// PS6 introduced a new header with variable length text
var headerInfoLen = data.Mid(iptc_iim_length, 1).ToUShort();
int lenToSkip;
if (headerInfoLen > 0)
{
// PS6 header: 1 byte headerinfolen + headerinfo + 2 bytes 00 padding (?) + 2 bytes length
lenToSkip = 1 + headerInfoLen + 4;
}
else
{
//old style: 4 bytes 00 padding (?) + 2 bytes length
lenToSkip = 6;
}
data.RemoveRange(0, iptc_iim_length + lenToSkip);
var reader = new IIM.IIMReader(data);
var tag = reader.Process();
if (tag != null)
{
ImageTag.AddTag(tag);
}
}
/// <summary>
/// Reads an APP13 segment to find IPTC-IIM metadata.
/// </summary>
/// <param name="length">
/// The length of the segment that will be read.
/// </param>
/// <remarks>More info and specs for IPTC-IIM:
/// - Guidelines for Handling Image Metadata (http://www.metadataworkinggroup.org/specs/)
/// - IPTC Standard Photo Metadata (July 2010) (http://www.iptc.org/std/photometadata/specification/IPTC-PhotoMetadata-201007_1.pdf)
/// - Extracting IPTC header information from JPEG images (http://www.codeproject.com/KB/graphics/iptc.aspx?fid=2301&df=90&mpp=25&noise=3&prof=False&sort=Position&view=Quick&fr=51#xx0xx)
/// - Reading IPTC APP14 Segment Header Information from JPEG Images (http://www.codeproject.com/KB/graphics/ReadingIPTCAPP14.aspx?q=iptc)
/// </remarks>
void ReadAPP13Segment(ushort length)
{
var data = ReadBlock(length);
// The APP13 segment consists of:
// - the string "Photoshop 3.0\u0000"
// - followed by "8BIM"
// - and then the section type "\u0004\u0004".
// There might be multiple 8BIM sections with different types, but we're following
// YAGNI for now and only deal with the one we're interested in (and hope that it's
// the first one).
var iptc_iim_length = IPTC_IIM_IDENTIFIER.Length;
if (length < iptc_iim_length || data.Mid(0, iptc_iim_length) != IPTC_IIM_IDENTIFIER)
{
return;
}
// PS6 introduced a new header with variable length text
var headerInfoLen = data.Mid(iptc_iim_length, 1).ToUShort();
int lenToSkip;
if (headerInfoLen > 0)
{
// PS6 header: 1 byte headerinfolen + headerinfo + 2 bytes 00 padding (?) + 2 bytes length
lenToSkip = 1 + headerInfoLen + 4;
}
else
{
//old style: 4 bytes 00 padding (?) + 2 bytes length
lenToSkip = 6;
}
data.RemoveRange(0, iptc_iim_length + lenToSkip);
var reader = new IIM.IIMReader(data);
var tag = reader.Process();
if (tag != null)
{
ImageTag.AddTag(tag);
}
}
/// <summary>
/// Reads an APP13 segment to find IPTC-IIM metadata.
/// </summary>
/// <param name="length">
/// The length of the segment that will be read.
/// </param>
/// <remarks>More info and specs for IPTC-IIM:
/// - Guidelines for Handling Image Metadata (http://www.metadataworkinggroup.org/specs/)
/// - IPTC Standard Photo Metadata (July 2010) (http://www.iptc.org/std/photometadata/specification/IPTC-PhotoMetadata-201007_1.pdf)
/// - Extracting IPTC header information from JPEG images (http://www.codeproject.com/KB/graphics/iptc.aspx?fid=2301&df=90&mpp=25&noise=3&prof=False&sort=Position&view=Quick&fr=51#xx0xx)
/// - Reading IPTC APP14 Segment Header Information from JPEG Images (http://www.codeproject.com/KB/graphics/ReadingIPTCAPP14.aspx?q=iptc)
/// </remarks>
private void ReadAPP13Segment (ushort length)
{
// TODO: if both IPTC-IIM and XMP metadata is contained in a file, we should read
// a IPTC-IIM checksum and compare that with the checksum built over the IIM block.
// Depending on the result we should prefer the information from XMP or IIM.
// Right now we always prefer XMP.
var data = ReadBlock (length);
// The APP13 segment consists of:
// - the string "Photoshop 3.0\u0000"
// - followed by "8BIM"
// - and then the section type "\u0004\u0004".
// There might be multiple 8BIM sections with different types, but we're following
// YAGNI for now and only deal with the one we're interested in (and hope that it's
// the first one).
var iptc_iim_length = IPTC_IIM_IDENTIFIER.Length;
if (length < iptc_iim_length || data.Mid (0, iptc_iim_length) != IPTC_IIM_IDENTIFIER)
return;
// PS6 introduced a new header with variable length text
var headerInfoLen = data.Mid (iptc_iim_length, 1).ToUShort();
int lenToSkip;
if (headerInfoLen > 0) {
// PS6 header: 1 byte headerinfolen + headerinfo + 2 bytes 00 padding (?) + 2 bytes length
lenToSkip = 1 + headerInfoLen + 4;
} else {
//old style: 4 bytes 00 padding (?) + 2 bytes length
lenToSkip = 6;
}
data.RemoveRange (0, iptc_iim_length + lenToSkip);
var reader = new IIM.IIMReader (data);
var tag = reader.Process ();
if (tag != null)
ImageTag.AddTag (tag);
}
