1 /* Copyright (C) 2001-2019 Artifex Software, Inc.
2 All Rights Reserved.
3
4 This software is provided AS-IS with no warranty, either express or
5 implied.
6
7 This software is distributed under license and may not be copied,
8 modified or distributed except as expressly authorized under the terms
9 of the license contained in the file LICENSE in this distribution.
10
11 Refer to licensing information at http://www.artifex.com or contact
12 Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato,
13 CA 94945, U.S.A., +1(415)492-9861, for further information.
14 */
15
16
17 /* Interface routines for IJG decoding code. */
18 #include "stdio_.h"
19 #include "string_.h"
20 #include "jpeglib_.h"
21 #include "jerror_.h"
22 #include "gserrors.h"
23 #include "gx.h"
24 #include "strimpl.h"
25 #include "sdct.h"
26 #include "sjpeg.h"
27
28 /*
29 * Interface routines. This layer of routines exists solely to limit
30 * side-effects from using setjmp.
31 */
32
33 int
gs_jpeg_create_decompress(stream_DCT_state * st)34 gs_jpeg_create_decompress(stream_DCT_state * st)
35 { /* Initialize error handling */
36 gs_jpeg_error_setup(st);
37 /* Establish the setjmp return context for gs_jpeg_error_exit to use. */
38 if (setjmp(find_jmp_buf(st->data.common->exit_jmpbuf)))
39 return_error(gs_jpeg_log_error(st));
40
41 jpeg_stream_data_common_init(st->data.decompress);
42
43 if (gs_jpeg_mem_init (st->memory, (j_common_ptr)&st->data.decompress->dinfo) < 0)
44 return_error(gs_error_VMerror);
45
46 jpeg_create_decompress(&st->data.decompress->dinfo);
47 return 0;
48 }
49
50 int
gs_jpeg_read_header(stream_DCT_state * st,boolean require_image)51 gs_jpeg_read_header(stream_DCT_state * st,
52 boolean require_image)
53 {
54 if (setjmp(find_jmp_buf(st->data.common->exit_jmpbuf)))
55 return_error(gs_jpeg_log_error(st));
56 return jpeg_read_header(&st->data.decompress->dinfo, require_image);
57 }
58
59 int
gs_jpeg_start_decompress(stream_DCT_state * st)60 gs_jpeg_start_decompress(stream_DCT_state * st)
61 {
62 if (setjmp(find_jmp_buf(st->data.common->exit_jmpbuf)))
63 return_error(gs_jpeg_log_error(st));
64 #if JPEG_LIB_VERSION > 55
65 return (int)jpeg_start_decompress(&st->data.decompress->dinfo);
66 #else
67 /* in IJG version 5, jpeg_start_decompress had no return value */
68 jpeg_start_decompress(&st->data.decompress->dinfo);
69 return 1;
70 #endif
71 }
72
73 int
gs_jpeg_read_scanlines(stream_DCT_state * st,JSAMPARRAY scanlines,int max_lines)74 gs_jpeg_read_scanlines(stream_DCT_state * st,
75 JSAMPARRAY scanlines,
76 int max_lines)
77 {
78 if (setjmp(find_jmp_buf(st->data.common->exit_jmpbuf)))
79 return_error(gs_jpeg_log_error(st));
80 return (int)jpeg_read_scanlines(&st->data.decompress->dinfo,
81 scanlines, (JDIMENSION) max_lines);
82 }
83
84 int
gs_jpeg_finish_decompress(stream_DCT_state * st)85 gs_jpeg_finish_decompress(stream_DCT_state * st)
86 {
87 int code = 0;
88 if (setjmp(find_jmp_buf(st->data.common->exit_jmpbuf)))
89 code = gs_note_error(gs_jpeg_log_error(st));
90 if (code >= 0)
91 code = (int)jpeg_finish_decompress(&st->data.decompress->dinfo);
92 stream_dct_end_passthrough(st->data.decompress);
93 return code;
94 }
95