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 */ 41 GETJOCTET(marker->data[0]) == 0x49 && 42 GETJOCTET(marker->data[1]) == 0x43 && 43 GETJOCTET(marker->data[2]) == 0x43 && 44 GETJOCTET(marker->data[3]) == 0x5F && 45 GETJOCTET(marker->data[4]) == 0x50 && 46 GETJOCTET(marker->data[5]) == 0x52 && 47 GETJOCTET(marker->data[6]) == 0x4F && 48 GETJOCTET(marker->data[7]) == 0x46 && 49 GETJOCTET(marker->data[8]) == 0x49 && 50 GETJOCTET(marker->data[9]) == 0x4C && 51 GETJOCTET(marker->data[10]) == 0x45 && 52 GETJOCTET(marker->data[11]) == 0x0; 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) 105 num_markers = GETJOCTET(marker->data[13]); 106 else if (num_markers != GETJOCTET(marker->data[13])) { 107 WARNMS(cinfo, JWRN_BOGUS_ICC); /* inconsistent num_markers fields */ 108 return FALSE; 109 } 110 seq_no = GETJOCTET(marker->data[12]); 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; 157 seq_no = GETJOCTET(marker->data[12]); 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 } 172
