291 lines
6.9 KiB
C
291 lines
6.9 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2008 Adrian Johnson
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is Adrian Johnson.
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*
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* Contributor(s):
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* Adrian Johnson <ajohnson@redneon.com>
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*/
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#include "cairoint.h"
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#include "cairo-image-info-private.h"
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static uint32_t
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_get_be32 (const unsigned char *p)
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{
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return p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
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}
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/* JPEG (image/jpeg)
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*
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* http://www.w3.org/Graphics/JPEG/itu-t81.pdf
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*/
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/* Markers with no parameters. All other markers are followed by a two
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* byte length of the parameters. */
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#define TEM 0x01
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#define RST_begin 0xd0
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#define RST_end 0xd7
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#define SOI 0xd8
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#define EOI 0xd9
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/* Start of frame markers. */
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#define SOF0 0xc0
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#define SOF1 0xc1
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#define SOF2 0xc2
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#define SOF3 0xc3
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#define SOF5 0xc5
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#define SOF6 0xc6
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#define SOF7 0xc7
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#define SOF9 0xc9
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#define SOF10 0xca
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#define SOF11 0xcb
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#define SOF13 0xcd
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#define SOF14 0xce
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#define SOF15 0xcf
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static const unsigned char *
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_jpeg_skip_segment (const unsigned char *p)
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{
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int len;
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p++;
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len = (p[0] << 8) | p[1];
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return p + len;
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}
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static void
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_jpeg_extract_info (cairo_image_info_t *info, const unsigned char *p)
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{
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info->width = (p[6] << 8) + p[7];
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info->height = (p[4] << 8) + p[5];
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info->num_components = p[8];
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info->bits_per_component = p[3];
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}
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cairo_int_status_t
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_cairo_image_info_get_jpeg_info (cairo_image_info_t *info,
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const unsigned char *data,
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long length)
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{
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const unsigned char *p = data;
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while (p + 1 < data + length) {
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if (*p != 0xff)
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return CAIRO_INT_STATUS_UNSUPPORTED;
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p++;
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switch (*p) {
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/* skip fill bytes */
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case 0xff:
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p++;
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break;
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case TEM:
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case SOI:
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case EOI:
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p++;
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break;
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case SOF0:
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case SOF1:
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case SOF2:
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case SOF3:
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case SOF5:
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case SOF6:
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case SOF7:
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case SOF9:
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case SOF10:
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case SOF11:
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case SOF13:
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case SOF14:
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case SOF15:
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/* Start of frame found. Extract the image parameters. */
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if (p + 8 > data + length)
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return CAIRO_INT_STATUS_UNSUPPORTED;
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_jpeg_extract_info (info, p);
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return CAIRO_STATUS_SUCCESS;
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default:
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if (*p >= RST_begin && *p <= RST_end) {
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p++;
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break;
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}
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if (p + 2 > data + length)
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return CAIRO_INT_STATUS_UNSUPPORTED;
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p = _jpeg_skip_segment (p);
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break;
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}
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}
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return CAIRO_STATUS_SUCCESS;
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}
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/* JPEG 2000 (image/jp2)
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*
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* http://www.jpeg.org/public/15444-1annexi.pdf
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*/
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#define JPX_FILETYPE 0x66747970
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#define JPX_JP2_HEADER 0x6A703268
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#define JPX_IMAGE_HEADER 0x69686472
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static const unsigned char _jpx_signature[] = {
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0x00, 0x00, 0x00, 0x0c, 0x6a, 0x50, 0x20, 0x20, 0x0d, 0x0a, 0x87, 0x0a
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};
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static const unsigned char *
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_jpx_next_box (const unsigned char *p)
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{
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return p + _get_be32 (p);
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}
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static const unsigned char *
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_jpx_get_box_contents (const unsigned char *p)
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{
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return p + 8;
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}
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static cairo_bool_t
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_jpx_match_box (const unsigned char *p, const unsigned char *end, uint32_t type)
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{
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uint32_t length;
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if (p + 8 < end) {
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length = _get_be32 (p);
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if (_get_be32 (p + 4) == type && p + length < end)
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return TRUE;
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}
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return FALSE;
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}
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static const unsigned char *
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_jpx_find_box (const unsigned char *p, const unsigned char *end, uint32_t type)
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{
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while (p < end) {
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if (_jpx_match_box (p, end, type))
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return p;
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p = _jpx_next_box (p);
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}
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return NULL;
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}
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static void
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_jpx_extract_info (const unsigned char *p, cairo_image_info_t *info)
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{
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info->height = _get_be32 (p);
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info->width = _get_be32 (p + 4);
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info->num_components = (p[8] << 8) + p[9];
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info->bits_per_component = p[10];
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}
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cairo_int_status_t
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_cairo_image_info_get_jpx_info (cairo_image_info_t *info,
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const unsigned char *data,
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unsigned long length)
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{
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const unsigned char *p = data;
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const unsigned char *end = data + length;
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/* First 12 bytes must be the JPEG 2000 signature box. */
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if (length < ARRAY_LENGTH(_jpx_signature) ||
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memcmp(p, _jpx_signature, ARRAY_LENGTH(_jpx_signature)) != 0)
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return CAIRO_INT_STATUS_UNSUPPORTED;
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p += ARRAY_LENGTH(_jpx_signature);
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/* Next box must be a File Type Box */
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if (! _jpx_match_box (p, end, JPX_FILETYPE))
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return CAIRO_INT_STATUS_UNSUPPORTED;
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p = _jpx_next_box (p);
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/* Locate the JP2 header box. */
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p = _jpx_find_box (p, end, JPX_JP2_HEADER);
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if (!p)
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return CAIRO_INT_STATUS_UNSUPPORTED;
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/* Step into the JP2 header box. First box must be the Image
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* Header */
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p = _jpx_get_box_contents (p);
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if (! _jpx_match_box (p, end, JPX_IMAGE_HEADER))
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return CAIRO_INT_STATUS_UNSUPPORTED;
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/* Get the image info */
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p = _jpx_get_box_contents (p);
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_jpx_extract_info (p, info);
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return CAIRO_STATUS_SUCCESS;
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}
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/* PNG (image/png)
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*
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* http://www.w3.org/TR/2003/REC-PNG-20031110/
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*/
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#define PNG_IHDR 0x49484452
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static const unsigned char _png_magic[8] = { 137, 80, 78, 71, 13, 10, 26, 10 };
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cairo_int_status_t
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_cairo_image_info_get_png_info (cairo_image_info_t *info,
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const unsigned char *data,
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unsigned long length)
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{
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const unsigned char *p = data;
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const unsigned char *end = data + length;
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if (length < 8 || memcmp (data, _png_magic, 8) != 0)
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return CAIRO_INT_STATUS_UNSUPPORTED;
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p += 8;
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/* The first chunk must be IDHR. IDHR has 13 bytes of data plus
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* the 12 bytes of overhead for the chunk. */
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if (p + 13 + 12 > end)
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return CAIRO_INT_STATUS_UNSUPPORTED;
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p += 4;
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if (_get_be32 (p) != PNG_IHDR)
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return CAIRO_INT_STATUS_UNSUPPORTED;
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p += 4;
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info->width = _get_be32 (p);
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p += 4;
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info->height = _get_be32 (p);
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return CAIRO_STATUS_SUCCESS;
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}
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