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-rw-r--r--media/libjpeg/jdicc.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/media/libjpeg/jdicc.c b/media/libjpeg/jdicc.c
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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;
+}