157 static bool fill_temp(struct xz_dec *s, struct xz_buf *b)  in fill_temp()  argument
160 			b->in_size - b->in_pos, s->temp.size - s->temp.pos);  in fill_temp()
162 	memcpy(s->temp.buf + s->temp.pos, b->in + b->in_pos, copy_size);  in fill_temp()
163 	b->in_pos += copy_size;  in fill_temp()
218 static enum xz_ret dec_block(struct xz_dec *s, struct xz_buf *b)  in dec_block()  argument
222 	s->in_start = b->in_pos;  in dec_block()
223 	s->out_start = b->out_pos;  in dec_block()
227 		ret = xz_dec_bcj_run(s->bcj, s->lzma2, b);  in dec_block()
230 		ret = xz_dec_lzma2_run(s->lzma2, b);  in dec_block()
232 	s->block.compressed += b->in_pos - s->in_start;  in dec_block()
233 	s->block.uncompressed += b->out_pos - s->out_start;  in dec_block()
245 		s->crc32 = xz_crc32(b->out + s->out_start,  in dec_block()
246 				b->out_pos - s->out_start, s->crc32);  in dec_block()
281 static void index_update(struct xz_dec *s, const struct xz_buf *b)  in index_update()  argument
283 	size_t in_used = b->in_pos - s->in_start;  in index_update()
285 	s->crc32 = xz_crc32(b->in + s->in_start, in_used, s->crc32);  in index_update()
296 static enum xz_ret dec_index(struct xz_dec *s, struct xz_buf *b)  in dec_index()  argument
301 		ret = dec_vli(s, b->in, &b->in_pos, b->in_size);  in dec_index()
303 			index_update(s, b);  in dec_index()
346 static enum xz_ret crc32_validate(struct xz_dec *s, struct xz_buf *b)  in crc32_validate()  argument
349 		if (b->in_pos == b->in_size)  in crc32_validate()
352 		if (((s->crc32 >> s->pos) & 0xFF) != b->in[b->in_pos++])  in crc32_validate()
370 static bool check_skip(struct xz_dec *s, struct xz_buf *b)  in check_skip()  argument
373 		if (b->in_pos == b->in_size)  in check_skip()
376 		++b->in_pos;  in check_skip()
549 static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b)  in dec_main()  argument
557 	s->in_start = b->in_pos;  in dec_main()
570 			if (!fill_temp(s, b))  in dec_main()
590 			if (b->in_pos == b->in_size)  in dec_main()
594 			if (b->in[b->in_pos] == 0) {  in dec_main()
595 				s->in_start = b->in_pos++;  in dec_main()
605 				= ((uint32_t)b->in[b->in_pos] + 1) * 4;  in dec_main()
614 			if (!fill_temp(s, b))  in dec_main()
626 			ret = dec_block(s, b);  in dec_main()
643 				if (b->in_pos == b->in_size)  in dec_main()
646 				if (b->in[b->in_pos++] != 0)  in dec_main()
658 				ret = crc32_validate(s, b);  in dec_main()
663 			else if (!check_skip(s, b)) {  in dec_main()
672 			ret = dec_index(s, b);  in dec_main()
681 			while ((s->index.size + (b->in_pos - s->in_start))  in dec_main()
683 				if (b->in_pos == b->in_size) {  in dec_main()
684 					index_update(s, b);  in dec_main()
688 				if (b->in[b->in_pos++] != 0)  in dec_main()
693 			index_update(s, b);  in dec_main()
705 			ret = crc32_validate(s, b);  in dec_main()
715 			if (!fill_temp(s, b))  in dec_main()
750 XZ_EXTERN enum xz_ret xz_dec_run(struct xz_dec *s, struct xz_buf *b)  in xz_dec_run()  argument
759 	in_start = b->in_pos;  in xz_dec_run()
760 	out_start = b->out_pos;  in xz_dec_run()
761 	ret = dec_main(s, b);  in xz_dec_run()
765 			ret = b->in_pos == b->in_size  in xz_dec_run()
769 			b->in_pos = in_start;  in xz_dec_run()
770 			b->out_pos = out_start;  in xz_dec_run()
773 	} else if (ret == XZ_OK && in_start == b->in_pos  in xz_dec_run()
774 			&& out_start == b->out_pos) {  in xz_dec_run()