liblzma/lz/lz_decoder.c

54 lz_decoder_reset(lzma_coder *coder)
56 	coder->dict.pos = 2 * LZ_DICT_REPEAT_MAX;
57 	coder->dict.full = 0;
58 	coder->dict.buf[2 * LZ_DICT_REPEAT_MAX - 1] = '\0';
59 	coder->dict.has_wrapped = false;
60 	coder->dict.need_reset = false;
66 decode_buffer(lzma_coder *coder,
73 		if (coder->dict.pos == coder->dict.size) {
75 			coder->dict.pos = LZ_DICT_REPEAT_MAX;
76 			coder->dict.has_wrapped = true;
77 			memcpy(coder->dict.buf, coder->dict.buf
78 						+ coder->dict.size
85 		const size_t dict_start = coder->dict.pos;
87 		// Calculate how much we allow coder->lz.code() to decode.
91 		coder->dict.limit = coder->dict.pos
93 					coder->dict.size - coder->dict.pos);
95 		// Call the coder->lz.code() to do the actual decoding.
96 		const lzma_ret ret = coder->lz.code(
97 				coder->lz.coder, &coder->dict,
105 		const size_t copy_size = coder->dict.pos - dict_start;
109 			memcpy(out + *out_pos, coder->dict.buf + dict_start,
114 		// Reset the dictionary if so requested by coder->lz.code().
115 		if (coder->dict.need_reset) {
116 			lz_decoder_reset(coder);
133 					|| coder->dict.pos < coder->dict.size)
147 	lzma_coder *coder = coder_ptr;
149 	if (coder->next.code == NULL)
150 		return decode_buffer(coder, in, in_pos, in_size,
153 	// We aren't the last coder in the chain, we need to decode
157 		if (!coder->next_finished
158 				&& coder->temp.pos == coder->temp.size) {
159 			coder->temp.pos = 0;
160 			coder->temp.size = 0;
162 			const lzma_ret ret = coder->next.code(
163 					coder->next.coder,
165 					coder->temp.buffer, &coder->temp.size,
169 				coder->next_finished = true;
170 			else if (ret != LZMA_OK || coder->temp.size == 0)
174 		if (coder->this_finished) {
175 			if (coder->temp.size != 0)
178 			if (coder->next_finished)
184 		const lzma_ret ret = decode_buffer(coder, coder->temp.buffer,
185 				&coder->temp.pos, coder->temp.size,
189 			coder->this_finished = true;
192 		else if (coder->next_finished && *out_pos < out_size)
203 	lzma_coder *coder = coder_ptr;
205 	lzma_next_end(&coder->next, allocator);
206 	lzma_free(coder->dict.buf, allocator);
208 	if (coder->lz.end != NULL)
209 		coder->lz.end(coder->lz.coder, allocator);
211 		lzma_free(coder->lz.coder, allocator);
213 	lzma_free(coder, allocator);
227 	lzma_coder *coder = next->coder;
228 	if (coder == NULL) {
229 		coder = lzma_alloc(sizeof(lzma_coder), allocator);
230 		if (coder == NULL)
233 		next->coder = coder;
237 		coder->dict.buf = NULL;
238 		coder->dict.size = 0;
239 		coder->lz = LZMA_LZ_DECODER_INIT;
240 		coder->next = LZMA_NEXT_CODER_INIT;
246 	return_if_error(lz_init(&coder->lz, allocator,
278 	if (coder->dict.size != alloc_size) {
279 		lzma_free(coder->dict.buf, allocator);
280 		coder->dict.buf = lzma_alloc(alloc_size, allocator);
281 		if (coder->dict.buf == NULL)
285 		// coder->dict.full is updated will take care that we will
287 		coder->dict.size = alloc_size;
290 	lz_decoder_reset(next->coder);
300 		memcpy(coder->dict.buf + coder->dict.pos,
305 		coder->dict.pos += copy_size;
306 		coder->dict.full = copy_size;
310 	coder->next_finished = false;
311 	coder->this_finished = false;
312 	coder->temp.pos = 0;
313 	coder->temp.size = 0;
316 	return lzma_next_filter_init(&coder->next, allocator, filters + 1);