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+/* jpeg-icc.c
+ *
+ * This file provides code to read and write International Color
+ * Consortium (ICC) device profiles embedded in JFIF JPEG image files.
+ * The ICC has defined a standard format for including such data in
+ * JPEG "APP2" markers. The code given here does not know anything
+ * about the internal structure of the ICC profile data; it just knows
+ * how to put the profile data into a JPEG file being written, or get
+ * it back out when reading.
+ *
+ * This code depends on new features added to the IJG JPEG library as of
+ * IJG release 6b; it will not compile or work with older IJG versions.
+ */
+
+/* This code was originally copied from the jpegicc tool as found in
+ * the lcms source code. This code comes with the following copyright
+ * notice:
+ *
+ * Little cms
+ * Copyright (C) 1998-2004 Marti Maria
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ */
+
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+
+#include <jpeglib.h>
+
+#include <glib.h>
+
+#include "jpeg-icc.h"
+
+
+/*
+ * Since an ICC profile can be larger than the maximum size of a JPEG
+ * marker (64K), we need provisions to split it into multiple markers.
+ * The format defined by the ICC specifies one or more APP2 markers
+ * containing the following data:
+ *
+ * Identifying string ASCII "ICC_PROFILE\0" (12 bytes)
+ * Marker sequence number 1 for first APP2, 2 for next, etc (1 byte)
+ * Number of markers Total number of APP2's used (1 byte)
+ * Profile data (remainder of APP2 data)
+
+ * Decoders should use the marker sequence numbers to reassemble the
+ * profile, rather than assuming that the APP2 markers appear in the
+ * correct sequence.
+ */
+
+#define ICC_MARKER (JPEG_APP0 + 2) /* JPEG marker code for ICC */
+#define ICC_OVERHEAD_LEN 14 /* size of non-profile data in APP2 */
+#define MAX_BYTES_IN_MARKER 65533 /* maximum data len of a JPEG marker */
+#define MAX_DATA_BYTES_IN_MARKER (MAX_BYTES_IN_MARKER - ICC_OVERHEAD_LEN)
+
+
+/*
+ * This routine writes the given ICC profile data into a JPEG file.
+ * It *must* be called AFTER calling jpeg_start_compress() and BEFORE
+ * the first call to jpeg_write_scanlines().
+ * (This ordering ensures that the APP2 marker(s) will appear after the
+ * SOI and JFIF or Adobe markers, but before all else.)
+ */
+
+void
+jpeg_icc_write_profile (j_compress_ptr cinfo,
+ const guchar *icc_data_ptr,
+ guint icc_data_len)
+{
+ unsigned int num_markers; /* total number of markers we'll write */
+ int cur_marker = 1; /* per spec, counting starts at 1 */
+ unsigned int length; /* number of bytes to write in this marker */
+
+ /* Calculate the number of markers we'll need, rounding up of course */
+ num_markers = icc_data_len / MAX_DATA_BYTES_IN_MARKER;
+ if (num_markers * MAX_DATA_BYTES_IN_MARKER != icc_data_len)
+ num_markers++;
+
+ while (icc_data_len > 0) {
+ /* length of profile to put in this marker */
+ length = icc_data_len;
+ if (length > MAX_DATA_BYTES_IN_MARKER)
+ length = MAX_DATA_BYTES_IN_MARKER;
+ icc_data_len -= length;
+
+ /* Write the JPEG marker header (APP2 code and marker length) */
+ jpeg_write_m_header(cinfo, ICC_MARKER,
+ (unsigned int) (length + ICC_OVERHEAD_LEN));
+
+ /* Write the marker identifying string "ICC_PROFILE" (null-terminated).
+ * We code it in this less-than-transparent way so that the code works
+ * even if the local character set is not ASCII.
+ */
+ jpeg_write_m_byte(cinfo, 0x49);
+ jpeg_write_m_byte(cinfo, 0x43);
+ jpeg_write_m_byte(cinfo, 0x43);
+ jpeg_write_m_byte(cinfo, 0x5F);
+ jpeg_write_m_byte(cinfo, 0x50);
+ jpeg_write_m_byte(cinfo, 0x52);
+ jpeg_write_m_byte(cinfo, 0x4F);
+ jpeg_write_m_byte(cinfo, 0x46);
+ jpeg_write_m_byte(cinfo, 0x49);
+ jpeg_write_m_byte(cinfo, 0x4C);
+ jpeg_write_m_byte(cinfo, 0x45);
+ jpeg_write_m_byte(cinfo, 0x0);
+
+ /* Add the sequencing info */
+ jpeg_write_m_byte(cinfo, cur_marker);
+ jpeg_write_m_byte(cinfo, (int) num_markers);
+
+ /* Add the profile data */
+ while (length--) {
+ jpeg_write_m_byte(cinfo, *icc_data_ptr);
+ icc_data_ptr++;
+ }
+ cur_marker++;
+ }
+}
+
+
+/*
+ * Handy subroutine to test whether a saved marker is an ICC profile marker.
+ */
+
+static boolean
+marker_is_icc (jpeg_saved_marker_ptr marker)
+{
+ return
+ marker->marker == ICC_MARKER &&
+ marker->data_length >= ICC_OVERHEAD_LEN &&
+ /* verify the identifying string */
+ GETJOCTET(marker->data[0]) == 0x49 &&
+ GETJOCTET(marker->data[1]) == 0x43 &&
+ GETJOCTET(marker->data[2]) == 0x43 &&
+ GETJOCTET(marker->data[3]) == 0x5F &&
+ GETJOCTET(marker->data[4]) == 0x50 &&
+ GETJOCTET(marker->data[5]) == 0x52 &&
+ GETJOCTET(marker->data[6]) == 0x4F &&
+ GETJOCTET(marker->data[7]) == 0x46 &&
+ GETJOCTET(marker->data[8]) == 0x49 &&
+ GETJOCTET(marker->data[9]) == 0x4C &&
+ GETJOCTET(marker->data[10]) == 0x45 &&
+ GETJOCTET(marker->data[11]) == 0x0;
+}
+
+
+/*
+ * See if there was an ICC profile in the JPEG file being read;
+ * if so, reassemble and return the profile data.
+ *
+ * TRUE is returned if an ICC profile was found, FALSE if not.
+ * If TRUE is returned, *icc_data_ptr is set to point to the
+ * returned data, and *icc_data_len is set to its length.
+ *
+ * NOTE: if the file contains invalid ICC APP2 markers, we just silently
+ * return FALSE. You might want to issue an error message instead.
+ */
+
+gboolean
+jpeg_icc_read_profile (j_decompress_ptr cinfo,
+ guchar **icc_data_ptr,
+ guint *icc_data_len)
+{
+ jpeg_saved_marker_ptr marker;
+ int num_markers = 0;
+ int seq_no;
+ JOCTET *icc_data;
+ unsigned int total_length;
+#define MAX_SEQ_NO 255 /* sufficient since marker numbers are bytes */
+ char marker_present[MAX_SEQ_NO+1]; /* 1 if marker found */
+ unsigned int data_length[MAX_SEQ_NO+1]; /* size of profile data in marker */
+ unsigned int data_offset[MAX_SEQ_NO+1]; /* offset for data in marker */
+
+ *icc_data_ptr = NULL; /* avoid confusion if FALSE return */
+ *icc_data_len = 0;
+
+ /* This first pass over the saved markers discovers whether there are
+ * any ICC markers and verifies the consistency of the marker numbering.
+ */
+
+ for (seq_no = 1; seq_no <= MAX_SEQ_NO; seq_no++)
+ marker_present[seq_no] = 0;
+
+ for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) {
+ if (marker_is_icc(marker)) {
+ if (num_markers == 0)
+ num_markers = GETJOCTET(marker->data[13]);
+ else if (num_markers != GETJOCTET(marker->data[13]))
+ return FALSE; /* inconsistent num_markers fields */
+ seq_no = GETJOCTET(marker->data[12]);
+ if (seq_no <= 0 || seq_no > num_markers)
+ return FALSE; /* bogus sequence number */
+ if (marker_present[seq_no])
+ return FALSE; /* duplicate sequence numbers */
+ marker_present[seq_no] = 1;
+ data_length[seq_no] = marker->data_length - ICC_OVERHEAD_LEN;
+ }
+ }
+
+ if (num_markers == 0)
+ return FALSE;
+
+ /* Check for missing markers, count total space needed,
+ * compute offset of each marker's part of the data.
+ */
+
+ total_length = 0;
+ for (seq_no = 1; seq_no <= num_markers; seq_no++) {
+ if (marker_present[seq_no] == 0)
+ return FALSE; /* missing sequence number */
+ data_offset[seq_no] = total_length;
+ total_length += data_length[seq_no];
+ }
+
+ if (total_length <= 0)
+ return FALSE; /* found only empty markers? */
+
+ /* Allocate space for assembled data */
+ icc_data = g_try_malloc (total_length * sizeof(JOCTET));
+ if (icc_data == NULL)
+ return FALSE; /* oops, out of memory */
+
+ /* and fill it in */
+ for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) {
+ if (marker_is_icc(marker)) {
+ JOCTET FAR *src_ptr;
+ JOCTET *dst_ptr;
+ unsigned int length;
+ seq_no = GETJOCTET(marker->data[12]);
+ dst_ptr = icc_data + data_offset[seq_no];
+ src_ptr = marker->data + ICC_OVERHEAD_LEN;
+ length = data_length[seq_no];
+ while (length--) {
+ *dst_ptr++ = *src_ptr++;
+ }
+ }
+ }
+
+ *icc_data_ptr = icc_data;
+ *icc_data_len = total_length;
+
+ return TRUE;
+}
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