/src/mupdf/source/fitz/gz-doc.c
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1 | | // Copyright (C) 2023-2024 Artifex Software, Inc. |
2 | | // |
3 | | // This file is part of MuPDF. |
4 | | // |
5 | | // MuPDF is free software: you can redistribute it and/or modify it under the |
6 | | // terms of the GNU Affero General Public License as published by the Free |
7 | | // Software Foundation, either version 3 of the License, or (at your option) |
8 | | // any later version. |
9 | | // |
10 | | // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY |
11 | | // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
12 | | // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more |
13 | | // details. |
14 | | // |
15 | | // You should have received a copy of the GNU Affero General Public License |
16 | | // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html> |
17 | | // |
18 | | // Alternative licensing terms are available from the licensor. |
19 | | // For commercial licensing, see <https://www.artifex.com/> or contact |
20 | | // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco, |
21 | | // CA 94129, USA, for further information. |
22 | | |
23 | | #include "mupdf/fitz.h" |
24 | | |
25 | | #ifndef MAX_WBITS |
26 | 0 | # define MAX_WBITS 15 /* 32K LZ77 window */ |
27 | | #endif |
28 | | |
29 | | static fz_document * |
30 | | gz_open_document(fz_context *ctx, const fz_document_handler *handler, fz_stream *ostm, fz_stream *accel, fz_archive *dir, void *state) |
31 | 0 | { |
32 | 0 | fz_stream *stm = fz_open_flated(ctx, ostm, 16 + MAX_WBITS); |
33 | 0 | fz_buffer *buf = NULL; |
34 | 0 | fz_document *doc = NULL; |
35 | |
|
36 | 0 | fz_var(buf); |
37 | 0 | fz_var(doc); |
38 | |
|
39 | 0 | fz_try(ctx) |
40 | 0 | { |
41 | 0 | buf = fz_read_all(ctx, stm, 1024); |
42 | | /* No way to pass the magic onwards :( */ |
43 | 0 | doc = fz_open_document_with_buffer(ctx, "application/octet-stream", buf); |
44 | 0 | } |
45 | 0 | fz_always(ctx) |
46 | 0 | { |
47 | 0 | fz_drop_stream(ctx, stm); |
48 | 0 | fz_drop_buffer(ctx, buf); |
49 | 0 | } |
50 | 0 | fz_catch(ctx) |
51 | 0 | fz_rethrow(ctx); |
52 | | |
53 | 0 | return doc; |
54 | 0 | } |
55 | | |
56 | | static const char *gz_extensions[] = |
57 | | { |
58 | | "gz", |
59 | | NULL |
60 | | }; |
61 | | |
62 | | static const char *gz_mimetypes[] = |
63 | | { |
64 | | "application/x-gzip-compressed", |
65 | | NULL |
66 | | }; |
67 | | |
68 | | static int |
69 | | gz_recognize_doc_content(fz_context *ctx, const fz_document_handler *handler, fz_stream *stream, fz_archive *dir, void **state, fz_document_recognize_state_free_fn **free_state) |
70 | 12 | { |
71 | 12 | int ret = 0; |
72 | 12 | uint8_t data[10]; |
73 | | |
74 | 12 | if (state) |
75 | 12 | *state = NULL; |
76 | 12 | if (free_state) |
77 | 12 | *free_state = NULL; |
78 | | |
79 | 12 | if (stream == NULL) |
80 | 0 | return 0; |
81 | | |
82 | 24 | fz_try(ctx) |
83 | 24 | { |
84 | 12 | fz_seek(ctx, stream, 0, SEEK_SET); |
85 | | /* 10 byte header */ |
86 | 12 | if (fz_read(ctx, stream, data, 10) != 10) |
87 | 0 | break; |
88 | | /* We only actually check the first 3 bytes though. */ |
89 | 12 | if (data[0] == 0x1f && data[1] == 0x8b && data[2] == 0x08) |
90 | 0 | ret = 100; |
91 | 12 | } |
92 | 24 | fz_catch(ctx) |
93 | 0 | fz_rethrow(ctx); |
94 | | |
95 | 12 | return ret; |
96 | 12 | } |
97 | | |
98 | | fz_document_handler gz_document_handler = |
99 | | { |
100 | | NULL, |
101 | | gz_open_document, |
102 | | gz_extensions, |
103 | | gz_mimetypes, |
104 | | gz_recognize_doc_content |
105 | | }; |