Bug 1852740: add tests for the `fetchpriority` attribute in Link headers. r=necko...
[gecko.git] / media / libjpeg / jdicc.c
blob50aa9a967677761b5c58aa1bc4861e0314415fe0
1 /*
2 * jdicc.c
4 * Copyright (C) 1997-1998, Thomas G. Lane, Todd Newman.
5 * Copyright (C) 2017, D. R. Commander.
6 * For conditions of distribution and use, see the accompanying README.ijg
7 * file.
9 * This file provides code to read International Color Consortium (ICC) device
10 * profiles embedded in JFIF JPEG image files. The ICC has defined a standard
11 * for including such data in JPEG "APP2" markers. The code given here does
12 * not know anything about the internal structure of the ICC profile data; it
13 * just knows how to get the profile data from a JPEG file while reading it.
16 #define JPEG_INTERNALS
17 #include "jinclude.h"
18 #include "jpeglib.h"
19 #include "jerror.h"
22 #define ICC_MARKER (JPEG_APP0 + 2) /* JPEG marker code for ICC */
23 #define ICC_OVERHEAD_LEN 14 /* size of non-profile data in APP2 */
27 * Handy subroutine to test whether a saved marker is an ICC profile marker.
30 LOCAL(boolean)
31 marker_is_icc(jpeg_saved_marker_ptr marker)
33 return
34 marker->marker == ICC_MARKER &&
35 marker->data_length >= ICC_OVERHEAD_LEN &&
36 /* verify the identifying string */
37 marker->data[0] == 0x49 &&
38 marker->data[1] == 0x43 &&
39 marker->data[2] == 0x43 &&
40 marker->data[3] == 0x5F &&
41 marker->data[4] == 0x50 &&
42 marker->data[5] == 0x52 &&
43 marker->data[6] == 0x4F &&
44 marker->data[7] == 0x46 &&
45 marker->data[8] == 0x49 &&
46 marker->data[9] == 0x4C &&
47 marker->data[10] == 0x45 &&
48 marker->data[11] == 0x0;
53 * See if there was an ICC profile in the JPEG file being read; if so,
54 * reassemble and return the profile data.
56 * TRUE is returned if an ICC profile was found, FALSE if not. If TRUE is
57 * returned, *icc_data_ptr is set to point to the returned data, and
58 * *icc_data_len is set to its length.
60 * IMPORTANT: the data at *icc_data_ptr is allocated with malloc() and must be
61 * freed by the caller with free() when the caller no longer needs it.
62 * (Alternatively, we could write this routine to use the IJG library's memory
63 * allocator, so that the data would be freed implicitly when
64 * jpeg_finish_decompress() is called. But it seems likely that many
65 * applications will prefer to have the data stick around after decompression
66 * finishes.)
69 GLOBAL(boolean)
70 jpeg_read_icc_profile(j_decompress_ptr cinfo, JOCTET **icc_data_ptr,
71 unsigned int *icc_data_len)
73 jpeg_saved_marker_ptr marker;
74 int num_markers = 0;
75 int seq_no;
76 JOCTET *icc_data;
77 unsigned int total_length;
78 #define MAX_SEQ_NO 255 /* sufficient since marker numbers are bytes */
79 char marker_present[MAX_SEQ_NO + 1]; /* 1 if marker found */
80 unsigned int data_length[MAX_SEQ_NO + 1]; /* size of profile data in marker */
81 unsigned int data_offset[MAX_SEQ_NO + 1]; /* offset for data in marker */
83 if (icc_data_ptr == NULL || icc_data_len == NULL)
84 ERREXIT(cinfo, JERR_BUFFER_SIZE);
85 if (cinfo->global_state < DSTATE_READY)
86 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
88 *icc_data_ptr = NULL; /* avoid confusion if FALSE return */
89 *icc_data_len = 0;
91 /* This first pass over the saved markers discovers whether there are
92 * any ICC markers and verifies the consistency of the marker numbering.
95 for (seq_no = 1; seq_no <= MAX_SEQ_NO; seq_no++)
96 marker_present[seq_no] = 0;
98 for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) {
99 if (marker_is_icc(marker)) {
100 if (num_markers == 0)
101 num_markers = marker->data[13];
102 else if (num_markers != marker->data[13]) {
103 WARNMS(cinfo, JWRN_BOGUS_ICC); /* inconsistent num_markers fields */
104 return FALSE;
106 seq_no = marker->data[12];
107 if (seq_no <= 0 || seq_no > num_markers) {
108 WARNMS(cinfo, JWRN_BOGUS_ICC); /* bogus sequence number */
109 return FALSE;
111 if (marker_present[seq_no]) {
112 WARNMS(cinfo, JWRN_BOGUS_ICC); /* duplicate sequence numbers */
113 return FALSE;
115 marker_present[seq_no] = 1;
116 data_length[seq_no] = marker->data_length - ICC_OVERHEAD_LEN;
120 if (num_markers == 0)
121 return FALSE;
123 /* Check for missing markers, count total space needed,
124 * compute offset of each marker's part of the data.
127 total_length = 0;
128 for (seq_no = 1; seq_no <= num_markers; seq_no++) {
129 if (marker_present[seq_no] == 0) {
130 WARNMS(cinfo, JWRN_BOGUS_ICC); /* missing sequence number */
131 return FALSE;
133 data_offset[seq_no] = total_length;
134 total_length += data_length[seq_no];
137 if (total_length == 0) {
138 WARNMS(cinfo, JWRN_BOGUS_ICC); /* found only empty markers? */
139 return FALSE;
142 /* Allocate space for assembled data */
143 icc_data = (JOCTET *)malloc(total_length * sizeof(JOCTET));
144 if (icc_data == NULL)
145 ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 11); /* oops, out of memory */
147 /* and fill it in */
148 for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) {
149 if (marker_is_icc(marker)) {
150 JOCTET FAR *src_ptr;
151 JOCTET *dst_ptr;
152 unsigned int length;
153 seq_no = marker->data[12];
154 dst_ptr = icc_data + data_offset[seq_no];
155 src_ptr = marker->data + ICC_OVERHEAD_LEN;
156 length = data_length[seq_no];
157 while (length--) {
158 *dst_ptr++ = *src_ptr++;
163 *icc_data_ptr = icc_data;
164 *icc_data_len = total_length;
166 return TRUE;