1///////////////////////////////////////////////////////////////////////////////
2//
3/// \file       sync_flush.c
4/// \brief      Encode files using LZMA_SYNC_FLUSH
5//
6//  Author:     Lasse Collin
7//
8//  This file has been put into the public domain.
9//  You can do whatever you want with this file.
10//
11///////////////////////////////////////////////////////////////////////////////
12
13#include "sysdefs.h"
14#include "lzma.h"
15#include <stdio.h>
16
17
18static lzma_stream strm = LZMA_STREAM_INIT;
19static FILE *file_in;
20
21
22static void
23encode(size_t size, lzma_action action)
24{
25	static const size_t CHUNK = 64;
26	uint8_t in[CHUNK];
27	uint8_t out[CHUNK];
28	lzma_ret ret;
29
30	do {
31		if (strm.avail_in == 0 && size > 0) {
32			const size_t amount = my_min(size, CHUNK);
33			strm.avail_in = fread(in, 1, amount, file_in);
34			strm.next_in = in;
35			size -= amount; // Intentionally not using avail_in.
36		}
37
38		strm.next_out = out;
39		strm.avail_out = CHUNK;
40
41		ret = lzma_code(&strm, size == 0 ? action : LZMA_RUN);
42
43		if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
44			fprintf(stderr, "%s:%u: %s: ret == %d\n",
45					__FILE__, __LINE__, __func__, ret);
46			exit(1);
47		}
48
49		fwrite(out, 1, CHUNK - strm.avail_out, stdout);
50
51	} while (size > 0 || strm.avail_out == 0);
52
53	if ((action == LZMA_RUN && ret != LZMA_OK)
54			|| (action != LZMA_RUN && ret != LZMA_STREAM_END)) {
55		fprintf(stderr, "%s:%u: %s: ret == %d\n",
56				__FILE__, __LINE__, __func__, ret);
57		exit(1);
58	}
59}
60
61
62int
63main(int argc, char **argv)
64{
65	file_in = argc > 1 ? fopen(argv[1], "rb") : stdin;
66
67	// Config
68	lzma_options_lzma opt_lzma = {
69		.dict_size = 1U << 16,
70		.lc = LZMA_LC_DEFAULT,
71		.lp = LZMA_LP_DEFAULT,
72		.pb = LZMA_PB_DEFAULT,
73		.preset_dict = NULL,
74		.mode = LZMA_MODE_NORMAL,
75		.nice_len = 32,
76		.mf = LZMA_MF_HC3,
77		.depth = 0,
78	};
79
80	lzma_options_delta opt_delta = {
81		.dist = 16
82	};
83
84	lzma_filter filters[LZMA_FILTERS_MAX + 1];
85	filters[0].id = LZMA_FILTER_LZMA2;
86	filters[0].options = &opt_lzma;
87	filters[1].id = LZMA_VLI_UNKNOWN;
88
89	// Init
90	if (lzma_stream_encoder(&strm, filters, LZMA_CHECK_CRC32) != LZMA_OK) {
91		fprintf(stderr, "init failed\n");
92		exit(1);
93	}
94
95	// Encoding
96	encode(0, LZMA_SYNC_FLUSH);
97	encode(6, LZMA_SYNC_FLUSH);
98	encode(0, LZMA_SYNC_FLUSH);
99	encode(7, LZMA_SYNC_FLUSH);
100	encode(0, LZMA_SYNC_FLUSH);
101	encode(0, LZMA_FINISH);
102
103/*
104	encode(53, LZMA_SYNC_FLUSH);
105	opt_lzma.lc = 2;
106	opt_lzma.lp = 1;
107	opt_lzma.pb = 0;
108	if (lzma_filters_update(&strm, filters) != LZMA_OK) {
109		fprintf(stderr, "update failed\n");
110		exit(1);
111	}
112	encode(404, LZMA_FINISH);
113*/
114
115	// Clean up
116	lzma_end(&strm);
117
118	return 0;
119
120	// Prevent useless warnings so we don't need to have special CFLAGS
121	// to disable -Werror.
122	(void)opt_lzma;
123	(void)opt_delta;
124}
125