aboutsummaryrefslogtreecommitdiff
path: root/src/liblzma/common/alone_encoder.c
blob: 7629aa77493955b1854d12ddcd80e0940bb49679 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
///////////////////////////////////////////////////////////////////////////////
//
/// \file       alone_decoder.c
/// \brief      Decoder for LZMA_Alone files
//
//  Copyright (C) 2007 Lasse Collin
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////

#include "common.h"
#include "lzma_encoder.h"


struct lzma_coder_s {
	lzma_next_coder next;

	enum {
		SEQ_PROPERTIES,
		SEQ_DICTIONARY_SIZE,
		SEQ_UNCOMPRESSED_SIZE,
		SEQ_CODE,
	} sequence;

	size_t pos;

	lzma_options_alone options;
};


static lzma_ret
alone_encode(lzma_coder *coder,
		lzma_allocator *allocator lzma_attribute((unused)),
		const uint8_t *restrict in, size_t *restrict in_pos,
		size_t in_size, uint8_t *restrict out,
		size_t *restrict out_pos, size_t out_size,
		lzma_action action)
{
	while (*out_pos < out_size)
	switch (coder->sequence) {
	case SEQ_PROPERTIES:
		if (lzma_lzma_encode_properties(
				&coder->options.lzma, out + *out_pos)) {
			return LZMA_PROG_ERROR;
		}

		coder->sequence = SEQ_DICTIONARY_SIZE;
		++*out_pos;
		break;

	case SEQ_DICTIONARY_SIZE:
		out[*out_pos] = coder->options.lzma.dictionary_size
				>> (coder->pos * 8);

		if (++coder->pos == 4) {
			coder->pos = 0;
			coder->sequence = SEQ_UNCOMPRESSED_SIZE;
		}

		++*out_pos;
		break;

	case SEQ_UNCOMPRESSED_SIZE:
		out[*out_pos] = coder->options.uncompressed_size
				>> (coder->pos * 8);

		if (++coder->pos == 8) {
			coder->pos = 0;
			coder->sequence = SEQ_CODE;
		}

		++*out_pos;
		break;

	case SEQ_CODE: {
		return coder->next.code(coder->next.coder,
				allocator, in, in_pos, in_size,
				out, out_pos, out_size, action);
	}

	default:
		return LZMA_PROG_ERROR;
	}

	return LZMA_OK;
}


static void
alone_encoder_end(lzma_coder *coder, lzma_allocator *allocator)
{
	lzma_next_coder_end(&coder->next, allocator);
	lzma_free(coder, allocator);
	return;
}


// At least for now, this is not used by any internal function.
static lzma_ret
alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
		const lzma_options_alone *options)
{
	if (next->coder == NULL) {
		next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
		if (next->coder == NULL)
			return LZMA_MEM_ERROR;

		next->code = &alone_encode;
		next->end = &alone_encoder_end;
		next->coder->next = LZMA_NEXT_CODER_INIT;
	}

	// Initialize the LZMA_Alone coder variables.
	next->coder->sequence = SEQ_PROPERTIES;
	next->coder->pos = 0;
	next->coder->options = *options;

	// Verify uncompressed_size since the other functions assume that
	// it is valid.
	if (!lzma_vli_is_valid(next->coder->options.uncompressed_size))
		return LZMA_PROG_ERROR;

	// Initialize the LZMA encoder.
	const lzma_filter_info filters[2] = {
		{
			.init = &lzma_lzma_encoder_init,
			.options = &next->coder->options.lzma,
			.uncompressed_size = next->coder->options
					.uncompressed_size,
		}, {
			.init = NULL,
		}
	};

	return lzma_next_filter_init(&next->coder->next, allocator, filters);
}


/*
extern lzma_ret
lzma_alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
		const lzma_options_alone *options)
{
	lzma_next_coder_init(alone_encoder_init, next, allocator, options);
}
*/


extern LZMA_API lzma_ret
lzma_alone_encoder(lzma_stream *strm, const lzma_options_alone *options)
{
	lzma_next_strm_init(strm, alone_encoder_init, options);

	strm->internal->supported_actions[LZMA_RUN] = true;
	strm->internal->supported_actions[LZMA_FINISH] = true;

	return LZMA_OK;
}