249 lines
8.4 KiB
C
249 lines
8.4 KiB
C
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/*
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* iccprofile.c
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*
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* This file provides code to read and write International Color Consortium
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* (ICC) device profiles embedded in JFIF JPEG image files. The ICC has
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* defined a standard format for including such data in JPEG "APP2" markers.
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* The code given here does not know anything about the internal structure
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* of the ICC profile data; it just knows how to put the profile data into
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* a JPEG file being written, or get it back out when reading.
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*
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* This code depends on new features added to the IJG JPEG library as of
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* IJG release 6b; it will not compile or work with older IJG versions.
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*
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* NOTE: this code would need surgery to work on 16-bit-int machines
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* with ICC profiles exceeding 64K bytes in size. If you need to do that,
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* change all the "unsigned int" variables to "INT32". You'll also need
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* to find a malloc() replacement that can allocate more than 64K.
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*/
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#include "iccjpeg.h"
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#include <stdlib.h> /* define malloc() */
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/*
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* Since an ICC profile can be larger than the maximum size of a JPEG marker
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* (64K), we need provisions to split it into multiple markers. The format
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* defined by the ICC specifies one or more APP2 markers containing the
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* following data:
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* Identifying string ASCII "ICC_PROFILE\0" (12 bytes)
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* Marker sequence number 1 for first APP2, 2 for next, etc (1 byte)
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* Number of markers Total number of APP2's used (1 byte)
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* Profile data (remainder of APP2 data)
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* Decoders should use the marker sequence numbers to reassemble the profile,
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* rather than assuming that the APP2 markers appear in the correct sequence.
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*/
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#define ICC_MARKER (JPEG_APP0 + 2) /* JPEG marker code for ICC */
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#define ICC_OVERHEAD_LEN 14 /* size of non-profile data in APP2 */
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#define MAX_BYTES_IN_MARKER 65533 /* maximum data len of a JPEG marker */
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#define MAX_DATA_BYTES_IN_MARKER (MAX_BYTES_IN_MARKER - ICC_OVERHEAD_LEN)
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/*
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* This routine writes the given ICC profile data into a JPEG file.
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* It *must* be called AFTER calling jpeg_start_compress() and BEFORE
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* the first call to jpeg_write_scanlines().
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* (This ordering ensures that the APP2 marker(s) will appear after the
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* SOI and JFIF or Adobe markers, but before all else.)
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*/
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void
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write_icc_profile (j_compress_ptr cinfo,
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const JOCTET *icc_data_ptr,
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unsigned int icc_data_len)
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{
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unsigned int num_markers; /* total number of markers we'll write */
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int cur_marker = 1; /* per spec, counting starts at 1 */
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unsigned int length; /* number of bytes to write in this marker */
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/* Calculate the number of markers we'll need, rounding up of course */
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num_markers = icc_data_len / MAX_DATA_BYTES_IN_MARKER;
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if (num_markers * MAX_DATA_BYTES_IN_MARKER != icc_data_len)
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num_markers++;
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while (icc_data_len > 0) {
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/* length of profile to put in this marker */
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length = icc_data_len;
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if (length > MAX_DATA_BYTES_IN_MARKER)
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length = MAX_DATA_BYTES_IN_MARKER;
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icc_data_len -= length;
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/* Write the JPEG marker header (APP2 code and marker length) */
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jpeg_write_m_header(cinfo, ICC_MARKER,
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(unsigned int) (length + ICC_OVERHEAD_LEN));
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/* Write the marker identifying string "ICC_PROFILE" (null-terminated).
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* We code it in this less-than-transparent way so that the code works
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* even if the local character set is not ASCII.
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*/
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jpeg_write_m_byte(cinfo, 0x49);
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jpeg_write_m_byte(cinfo, 0x43);
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jpeg_write_m_byte(cinfo, 0x43);
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jpeg_write_m_byte(cinfo, 0x5F);
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jpeg_write_m_byte(cinfo, 0x50);
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jpeg_write_m_byte(cinfo, 0x52);
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jpeg_write_m_byte(cinfo, 0x4F);
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jpeg_write_m_byte(cinfo, 0x46);
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jpeg_write_m_byte(cinfo, 0x49);
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jpeg_write_m_byte(cinfo, 0x4C);
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jpeg_write_m_byte(cinfo, 0x45);
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jpeg_write_m_byte(cinfo, 0x0);
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/* Add the sequencing info */
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jpeg_write_m_byte(cinfo, cur_marker);
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jpeg_write_m_byte(cinfo, (int) num_markers);
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/* Add the profile data */
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while (length--) {
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jpeg_write_m_byte(cinfo, *icc_data_ptr);
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icc_data_ptr++;
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}
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cur_marker++;
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}
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}
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/*
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* Prepare for reading an ICC profile
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*/
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void
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setup_read_icc_profile (j_decompress_ptr cinfo)
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{
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/* Tell the library to keep any APP2 data it may find */
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jpeg_save_markers(cinfo, ICC_MARKER, 0xFFFF);
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}
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/*
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* Handy subroutine to test whether a saved marker is an ICC profile marker.
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*/
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static boolean
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marker_is_icc (jpeg_saved_marker_ptr marker)
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{
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return
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marker->marker == ICC_MARKER &&
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marker->data_length >= ICC_OVERHEAD_LEN &&
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/* verify the identifying string */
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GETJOCTET(marker->data[0]) == 0x49 &&
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GETJOCTET(marker->data[1]) == 0x43 &&
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GETJOCTET(marker->data[2]) == 0x43 &&
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GETJOCTET(marker->data[3]) == 0x5F &&
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GETJOCTET(marker->data[4]) == 0x50 &&
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GETJOCTET(marker->data[5]) == 0x52 &&
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GETJOCTET(marker->data[6]) == 0x4F &&
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GETJOCTET(marker->data[7]) == 0x46 &&
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GETJOCTET(marker->data[8]) == 0x49 &&
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GETJOCTET(marker->data[9]) == 0x4C &&
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GETJOCTET(marker->data[10]) == 0x45 &&
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GETJOCTET(marker->data[11]) == 0x0;
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}
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/*
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* See if there was an ICC profile in the JPEG file being read;
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* if so, reassemble and return the profile data.
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*
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* TRUE is returned if an ICC profile was found, FALSE if not.
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* If TRUE is returned, *icc_data_ptr is set to point to the
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* returned data, and *icc_data_len is set to its length.
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*
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* IMPORTANT: the data at **icc_data_ptr has been allocated with malloc()
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* and must be freed by the caller with free() when the caller no longer
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* needs it. (Alternatively, we could write this routine to use the
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* IJG library's memory allocator, so that the data would be freed implicitly
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* at jpeg_finish_decompress() time. But it seems likely that many apps
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* will prefer to have the data stick around after decompression finishes.)
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*
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* NOTE: if the file contains invalid ICC APP2 markers, we just silently
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* return FALSE. You might want to issue an error message instead.
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*/
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boolean
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read_icc_profile (j_decompress_ptr cinfo,
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JOCTET **icc_data_ptr,
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unsigned int *icc_data_len)
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{
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jpeg_saved_marker_ptr marker;
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int num_markers = 0;
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int seq_no;
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JOCTET *icc_data;
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unsigned int total_length;
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#define MAX_SEQ_NO 255 /* sufficient since marker numbers are bytes */
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char marker_present[MAX_SEQ_NO+1]; /* 1 if marker found */
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unsigned int data_length[MAX_SEQ_NO+1]; /* size of profile data in marker */
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unsigned int data_offset[MAX_SEQ_NO+1]; /* offset for data in marker */
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*icc_data_ptr = NULL; /* avoid confusion if FALSE return */
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*icc_data_len = 0;
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/* This first pass over the saved markers discovers whether there are
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* any ICC markers and verifies the consistency of the marker numbering.
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*/
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for (seq_no = 1; seq_no <= MAX_SEQ_NO; seq_no++)
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marker_present[seq_no] = 0;
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for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) {
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if (marker_is_icc(marker)) {
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if (num_markers == 0)
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num_markers = GETJOCTET(marker->data[13]);
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else if (num_markers != GETJOCTET(marker->data[13]))
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return FALSE; /* inconsistent num_markers fields */
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seq_no = GETJOCTET(marker->data[12]);
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if (seq_no <= 0 || seq_no > num_markers)
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return FALSE; /* bogus sequence number */
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if (marker_present[seq_no])
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return FALSE; /* duplicate sequence numbers */
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marker_present[seq_no] = 1;
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data_length[seq_no] = marker->data_length - ICC_OVERHEAD_LEN;
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}
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}
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if (num_markers == 0)
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return FALSE;
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/* Check for missing markers, count total space needed,
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* compute offset of each marker's part of the data.
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*/
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total_length = 0;
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for (seq_no = 1; seq_no <= num_markers; seq_no++) {
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if (marker_present[seq_no] == 0)
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return FALSE; /* missing sequence number */
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data_offset[seq_no] = total_length;
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total_length += data_length[seq_no];
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}
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if (total_length == 0)
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return FALSE; /* found only empty markers? */
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/* Allocate space for assembled data */
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icc_data = (JOCTET *) malloc(total_length * sizeof(JOCTET));
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if (icc_data == NULL)
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return FALSE; /* oops, out of memory */
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/* and fill it in */
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for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) {
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if (marker_is_icc(marker)) {
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JOCTET FAR *src_ptr;
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JOCTET *dst_ptr;
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unsigned int length;
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seq_no = GETJOCTET(marker->data[12]);
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dst_ptr = icc_data + data_offset[seq_no];
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src_ptr = marker->data + ICC_OVERHEAD_LEN;
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length = data_length[seq_no];
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while (length--) {
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*dst_ptr++ = *src_ptr++;
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}
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}
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}
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*icc_data_ptr = icc_data;
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*icc_data_len = total_length;
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return TRUE;
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}
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