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- /*
- * jdicc.c
- *
- * Copyright (C) 1997-1998, Thomas G. Lane, Todd Newman.
- * Copyright (C) 2017, D. R. Commander.
- * For conditions of distribution and use, see the accompanying README.ijg
- * file.
- *
- * This file provides code to read International Color Consortium (ICC) device
- * profiles embedded in JFIF JPEG image files. The ICC has defined a standard
- * 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 get the profile data from a JPEG file while reading it.
- */
- #define JPEG_INTERNALS
- #include "jinclude.h"
- #include "jpeglib.h"
- #include "jerror.h"
- #define ICC_MARKER (JPEG_APP0 + 2) /* JPEG marker code for ICC */
- #define ICC_OVERHEAD_LEN 14 /* size of non-profile data in APP2 */
- /*
- * Handy subroutine to test whether a saved marker is an ICC profile marker.
- */
- LOCAL(boolean)
- marker_is_icc(jpeg_saved_marker_ptr marker)
- {
- return
- marker->marker == ICC_MARKER &&
- marker->data_length >= ICC_OVERHEAD_LEN &&
- /* verify the identifying string */
- marker->data[0] == 0x49 &&
- marker->data[1] == 0x43 &&
- marker->data[2] == 0x43 &&
- marker->data[3] == 0x5F &&
- marker->data[4] == 0x50 &&
- marker->data[5] == 0x52 &&
- marker->data[6] == 0x4F &&
- marker->data[7] == 0x46 &&
- marker->data[8] == 0x49 &&
- marker->data[9] == 0x4C &&
- marker->data[10] == 0x45 &&
- 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.
- *
- * IMPORTANT: the data at *icc_data_ptr is allocated with malloc() and must be
- * freed by the caller with free() when the caller no longer needs it.
- * (Alternatively, we could write this routine to use the IJG library's memory
- * allocator, so that the data would be freed implicitly when
- * jpeg_finish_decompress() is called. But it seems likely that many
- * applications will prefer to have the data stick around after decompression
- * finishes.)
- */
- GLOBAL(boolean)
- jpeg_read_icc_profile(j_decompress_ptr cinfo, JOCTET **icc_data_ptr,
- unsigned int *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 */
- if (icc_data_ptr == NULL || icc_data_len == NULL)
- ERREXIT(cinfo, JERR_BUFFER_SIZE);
- if (cinfo->global_state < DSTATE_READY)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
- *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 = marker->data[13];
- else if (num_markers != marker->data[13]) {
- WARNMS(cinfo, JWRN_BOGUS_ICC); /* inconsistent num_markers fields */
- return FALSE;
- }
- seq_no = marker->data[12];
- if (seq_no <= 0 || seq_no > num_markers) {
- WARNMS(cinfo, JWRN_BOGUS_ICC); /* bogus sequence number */
- return FALSE;
- }
- if (marker_present[seq_no]) {
- WARNMS(cinfo, JWRN_BOGUS_ICC); /* duplicate sequence numbers */
- return FALSE;
- }
- 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) {
- WARNMS(cinfo, JWRN_BOGUS_ICC); /* missing sequence number */
- return FALSE;
- }
- data_offset[seq_no] = total_length;
- total_length += data_length[seq_no];
- }
- if (total_length == 0) {
- WARNMS(cinfo, JWRN_BOGUS_ICC); /* found only empty markers? */
- return FALSE;
- }
- /* Allocate space for assembled data */
- icc_data = (JOCTET *)malloc(total_length * sizeof(JOCTET));
- if (icc_data == NULL)
- ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 11); /* 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 = 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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