chromium/third_party/libjpeg_turbo/jdicc.c

/*
 * 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 …
#define ICC_OVERHEAD_LEN …


/*
 * Handy subroutine to test whether a saved marker is an ICC profile marker.
 */

LOCAL(boolean)
marker_is_icc(jpeg_saved_marker_ptr marker)
{ … }


/*
 * 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)
{ … }