| /* |
| * 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; |
| } |