1 /*
2 * This file is part of the MicroPython project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2019-2020 Damien P. George
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27 #include <string.h>
28
29 #include "py/mphal.h"
30 #include "lib/uzlib/uzlib.h"
31 #include "gzstream.h"
32 #include "mboot.h"
33
34 #if MBOOT_FSLOAD || MBOOT_ENABLE_PACKING
35
36 #define DICT_SIZE (1 << 15)
37
38 typedef struct _gz_stream_t {
39 void *stream_data;
40 stream_read_t stream_read;
41 struct uzlib_uncomp tinf;
42 uint8_t buf[512];
43 uint8_t dict[DICT_SIZE];
44 } gz_stream_t;
45
46 static gz_stream_t gz_stream SECTION_NOZERO_BSS;
47
gz_stream_read_src(TINF_DATA * tinf)48 static int gz_stream_read_src(TINF_DATA *tinf) {
49 int n = gz_stream.stream_read(gz_stream.stream_data, gz_stream.buf, sizeof(gz_stream.buf));
50 if (n < 0) {
51 // Stream error
52 return -1;
53 }
54 if (n == 0) {
55 // No data / EOF
56 return -1;
57 }
58
59 tinf->source = gz_stream.buf + 1;
60 tinf->source_limit = gz_stream.buf + n;
61 return gz_stream.buf[0];
62 }
63
gz_stream_init_from_raw_data(const uint8_t * data,size_t len)64 int gz_stream_init_from_raw_data(const uint8_t *data, size_t len) {
65 memset(&gz_stream.tinf, 0, sizeof(gz_stream.tinf));
66 gz_stream.tinf.source = data;
67 gz_stream.tinf.source_limit = data + len;
68
69 uzlib_uncompress_init(&gz_stream.tinf, gz_stream.dict, DICT_SIZE);
70
71 return 0;
72 }
73
gz_stream_init_from_stream(void * stream_data,stream_read_t stream_read)74 int gz_stream_init_from_stream(void *stream_data, stream_read_t stream_read) {
75 gz_stream.stream_data = stream_data;
76 gz_stream.stream_read = stream_read;
77
78 memset(&gz_stream.tinf, 0, sizeof(gz_stream.tinf));
79 gz_stream.tinf.source_read_cb = gz_stream_read_src;
80
81 int st = uzlib_gzip_parse_header(&gz_stream.tinf);
82 if (st != TINF_OK) {
83 return -MBOOT_ERRNO_GUNZIP_FAILED;
84 }
85
86 uzlib_uncompress_init(&gz_stream.tinf, gz_stream.dict, DICT_SIZE);
87
88 return 0;
89 }
90
gz_stream_read(size_t len,uint8_t * buf)91 int gz_stream_read(size_t len, uint8_t *buf) {
92 if (gz_stream.tinf.source == NULL && gz_stream.tinf.source_read_cb == NULL) {
93 // End of stream.
94 return 0;
95 }
96 gz_stream.tinf.dest = buf;
97 gz_stream.tinf.dest_limit = buf + len;
98 int st = uzlib_uncompress_chksum(&gz_stream.tinf);
99 if (st < 0) {
100 return st;
101 }
102 if (st == TINF_DONE) {
103 // Indicate end-of-stream for subsequent calls.
104 gz_stream.tinf.source = NULL;
105 gz_stream.tinf.source_read_cb = NULL;
106 }
107 return gz_stream.tinf.dest - buf;
108 }
109
110 #endif // MBOOT_FSLOAD || MBOOT_ENABLE_PACKING
111