Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 1 | /* |
| 2 | * jdicc.c |
| 3 | * |
| 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. |
| 8 | * |
| 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. |
| 14 | */ |
| 15 | |
| 16 | #define JPEG_INTERNALS |
| 17 | #include "jinclude.h" |
| 18 | #include "jpeglib.h" |
| 19 | #include "jerror.h" |
| 20 | |
| 21 | #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc() */ |
| 22 | extern void *malloc(size_t size); |
| 23 | #endif |
| 24 | |
| 25 | |
| 26 | #define ICC_MARKER (JPEG_APP0 + 2) /* JPEG marker code for ICC */ |
| 27 | #define ICC_OVERHEAD_LEN 14 /* size of non-profile data in APP2 */ |
| 28 | |
| 29 | |
| 30 | /* |
| 31 | * Handy subroutine to test whether a saved marker is an ICC profile marker. |
| 32 | */ |
| 33 | |
| 34 | LOCAL(boolean) |
| 35 | marker_is_icc(jpeg_saved_marker_ptr marker) |
| 36 | { |
| 37 | return |
| 38 | marker->marker == ICC_MARKER && |
| 39 | marker->data_length >= ICC_OVERHEAD_LEN && |
| 40 | /* verify the identifying string */ |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 41 | marker->data[0] == 0x49 && |
| 42 | marker->data[1] == 0x43 && |
| 43 | marker->data[2] == 0x43 && |
| 44 | marker->data[3] == 0x5F && |
| 45 | marker->data[4] == 0x50 && |
| 46 | marker->data[5] == 0x52 && |
| 47 | marker->data[6] == 0x4F && |
| 48 | marker->data[7] == 0x46 && |
| 49 | marker->data[8] == 0x49 && |
| 50 | marker->data[9] == 0x4C && |
| 51 | marker->data[10] == 0x45 && |
| 52 | marker->data[11] == 0x0; |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 53 | } |
| 54 | |
| 55 | |
| 56 | /* |
| 57 | * See if there was an ICC profile in the JPEG file being read; if so, |
| 58 | * reassemble and return the profile data. |
| 59 | * |
| 60 | * TRUE is returned if an ICC profile was found, FALSE if not. If TRUE is |
| 61 | * returned, *icc_data_ptr is set to point to the returned data, and |
| 62 | * *icc_data_len is set to its length. |
| 63 | * |
| 64 | * IMPORTANT: the data at *icc_data_ptr is allocated with malloc() and must be |
| 65 | * freed by the caller with free() when the caller no longer needs it. |
| 66 | * (Alternatively, we could write this routine to use the IJG library's memory |
| 67 | * allocator, so that the data would be freed implicitly when |
| 68 | * jpeg_finish_decompress() is called. But it seems likely that many |
| 69 | * applications will prefer to have the data stick around after decompression |
| 70 | * finishes.) |
| 71 | */ |
| 72 | |
| 73 | GLOBAL(boolean) |
| 74 | jpeg_read_icc_profile(j_decompress_ptr cinfo, JOCTET **icc_data_ptr, |
| 75 | unsigned int *icc_data_len) |
| 76 | { |
| 77 | jpeg_saved_marker_ptr marker; |
| 78 | int num_markers = 0; |
| 79 | int seq_no; |
| 80 | JOCTET *icc_data; |
| 81 | unsigned int total_length; |
| 82 | #define MAX_SEQ_NO 255 /* sufficient since marker numbers are bytes */ |
| 83 | char marker_present[MAX_SEQ_NO + 1]; /* 1 if marker found */ |
| 84 | unsigned int data_length[MAX_SEQ_NO + 1]; /* size of profile data in marker */ |
| 85 | unsigned int data_offset[MAX_SEQ_NO + 1]; /* offset for data in marker */ |
| 86 | |
| 87 | if (icc_data_ptr == NULL || icc_data_len == NULL) |
| 88 | ERREXIT(cinfo, JERR_BUFFER_SIZE); |
| 89 | if (cinfo->global_state < DSTATE_READY) |
| 90 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 91 | |
| 92 | *icc_data_ptr = NULL; /* avoid confusion if FALSE return */ |
| 93 | *icc_data_len = 0; |
| 94 | |
| 95 | /* This first pass over the saved markers discovers whether there are |
| 96 | * any ICC markers and verifies the consistency of the marker numbering. |
| 97 | */ |
| 98 | |
| 99 | for (seq_no = 1; seq_no <= MAX_SEQ_NO; seq_no++) |
| 100 | marker_present[seq_no] = 0; |
| 101 | |
| 102 | for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) { |
| 103 | if (marker_is_icc(marker)) { |
| 104 | if (num_markers == 0) |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 105 | num_markers = marker->data[13]; |
| 106 | else if (num_markers != marker->data[13]) { |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 107 | WARNMS(cinfo, JWRN_BOGUS_ICC); /* inconsistent num_markers fields */ |
| 108 | return FALSE; |
| 109 | } |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 110 | seq_no = marker->data[12]; |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 111 | if (seq_no <= 0 || seq_no > num_markers) { |
| 112 | WARNMS(cinfo, JWRN_BOGUS_ICC); /* bogus sequence number */ |
| 113 | return FALSE; |
| 114 | } |
| 115 | if (marker_present[seq_no]) { |
| 116 | WARNMS(cinfo, JWRN_BOGUS_ICC); /* duplicate sequence numbers */ |
| 117 | return FALSE; |
| 118 | } |
| 119 | marker_present[seq_no] = 1; |
| 120 | data_length[seq_no] = marker->data_length - ICC_OVERHEAD_LEN; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | if (num_markers == 0) |
| 125 | return FALSE; |
| 126 | |
| 127 | /* Check for missing markers, count total space needed, |
| 128 | * compute offset of each marker's part of the data. |
| 129 | */ |
| 130 | |
| 131 | total_length = 0; |
| 132 | for (seq_no = 1; seq_no <= num_markers; seq_no++) { |
| 133 | if (marker_present[seq_no] == 0) { |
| 134 | WARNMS(cinfo, JWRN_BOGUS_ICC); /* missing sequence number */ |
| 135 | return FALSE; |
| 136 | } |
| 137 | data_offset[seq_no] = total_length; |
| 138 | total_length += data_length[seq_no]; |
| 139 | } |
| 140 | |
| 141 | if (total_length == 0) { |
| 142 | WARNMS(cinfo, JWRN_BOGUS_ICC); /* found only empty markers? */ |
| 143 | return FALSE; |
| 144 | } |
| 145 | |
| 146 | /* Allocate space for assembled data */ |
| 147 | icc_data = (JOCTET *)malloc(total_length * sizeof(JOCTET)); |
| 148 | if (icc_data == NULL) |
| 149 | ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 11); /* oops, out of memory */ |
| 150 | |
| 151 | /* and fill it in */ |
| 152 | for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) { |
| 153 | if (marker_is_icc(marker)) { |
| 154 | JOCTET FAR *src_ptr; |
| 155 | JOCTET *dst_ptr; |
| 156 | unsigned int length; |
Jonathan Wright | bbb8282 | 2020-11-25 13:36:43 +0000 | [diff] [blame] | 157 | seq_no = marker->data[12]; |
Chris Blume | cca8c4d | 2019-03-01 01:09:50 -0800 | [diff] [blame] | 158 | dst_ptr = icc_data + data_offset[seq_no]; |
| 159 | src_ptr = marker->data + ICC_OVERHEAD_LEN; |
| 160 | length = data_length[seq_no]; |
| 161 | while (length--) { |
| 162 | *dst_ptr++ = *src_ptr++; |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | *icc_data_ptr = icc_data; |
| 168 | *icc_data_len = total_length; |
| 169 | |
| 170 | return TRUE; |
| 171 | } |