|
|
|
libiptcdata Reference Manual | |
|---|---|---|---|---|
int iptc_jpeg_read_ps3 (FILE *infile, unsigned char *buf, unsigned int size); int iptc_jpeg_ps3_find_iptc (unsigned char *ps3, unsigned int ps3_size, unsigned int *iptc_len); int iptc_jpeg_ps3_save_iptc (unsigned char *ps3, unsigned int ps3_size, unsigned char *iptc, unsigned int iptc_size, unsigned char *buf, unsigned int size); int iptc_jpeg_save_with_ps3 (FILE *infile, FILE *outfile, unsigned char *ps3, unsigned int ps3_size);
int iptc_jpeg_read_ps3 (FILE *infile,
unsigned char *buf,
unsigned int size);
Scans the headers of a JPEG file looking for a "Photoshop 3.0" header, and if
found, stores the raw contents of this header in the buf buffer. The Photoshop
3.0 header is a series of records found in the APP13 section of a JPEG file.
If a JPEG file contains IPTC metadata, the metadata is stored in one of the
Photoshop 3.0 records.
|
an open JPEG file with the current position set to the start of the file |
|
an output buffer to store the Photoshop 3.0 data |
|
the size of the output buffer |
Returns : |
the number of bytes stored on success, 0 if the PS3 header was not found, or -1 if an error occurred. |
int iptc_jpeg_ps3_find_iptc (unsigned char *ps3,
unsigned int ps3_size,
unsigned int *iptc_len);
Parses a "Photoshop 3.0" header in search of IPTC metadata.
|
the data of a Photoshop 3.0 header to search |
|
size in bytes of ps3
|
|
output parameter, the size in bytes of any found IPTC data |
Returns : |
the offset in bytes from the start of ps3 where a block
of IPTC metadata begins, 0 if no IPTC metadata was found, -1 on error.
|
int iptc_jpeg_ps3_save_iptc (unsigned char *ps3,
unsigned int ps3_size,
unsigned char *iptc,
unsigned int iptc_size,
unsigned char *buf,
unsigned int size);
Takes a Photoshop 3.0 header, ps3, removes any existing IPTC data inside
that header, and inserts the new IPTC data from iptc. Any other non-IPTC
portions of ps3 are left unmodified. If ps3 is NULL, a blank PS3 header
is created. If iptc is NULL, the output PS3 header will contain no IPTC
data, even if ps3 originally contained some.
|
a template PS3 header in which to insert the new iptc data. Any non-IPTC data in this template will be preserved in the output Photoshop 3.0 header. If NULL, a PS3 header will be generated from scratch. |
|
size in bytes of ps3
|
|
the IPTC bytestream to be encapsulated in the PS3 output. The IPTC
bytestream can be generated with iptc_data_save(). If
NULL, the output will still be a valid PS3 header, but without any
contained IPTC data.
|
|
size in bytes of iptc
|
|
output buffer for the generated PS3 header |
|
size in bytes of buf
|
Returns : |
the number of bytes written to buf; -1 on error.
|
int iptc_jpeg_save_with_ps3 (FILE *infile,
FILE *outfile,
unsigned char *ps3,
unsigned int ps3_size);
Takes an existing JPEG file, infile, removes any existing Photoshop
3.0 header from it, and adds a new PS3 header, writing the output
to outfile. infile must be open for reading and is expected to point
to the beginning of the JPEG file, which should be different from outfile,
which must be open for writing. If ps3 is NULL, the output will contain
no PS3 header. PS3 headers reside in the APP13 section of the JPEG file,
which is created if necessary. All other headers and data will be copied
directly from infile without modification.
|
the file stream from which the image data is copied |
|
the output file stream |
|
the Photoshop 3.0 header to add to the output file |
|
size in bytes of ps3
|
Returns : |
0 on success, -1 on error. Note that even in error, some data
may have been written to outfile, and its contents should be considered
undefined.
|