lib/xz/xz_dec_stream.c

21 	/* Position in dec_main() */
35 	/* Position in variable-length integers and Check fields */
45 	/* CRC32 value in Block or Index */
60 	/* Information stored in Block Header */
63 		 * Value stored in the Compressed Size field, or
69 		 * Value stored in the Uncompressed Size field, or
98 		/* Position in dec_index() */
105 		/* Size of the Index in bytes */
108 		/* Number of Records (matches block.count in valid files) */
112 		 * Hash calculated from the Records (matches block.hash in
152  * Fill s->temp by copying data starting from b->in[b->in_pos]. Caller
162 	memcpy(s->temp.buf + s->temp.pos, b->in + b->in_pos, copy_size);
175 static enum xz_ret dec_vli(struct xz_dec *s, const uint8_t *in,
184 		byte = in[*in_pos];
209  * they don't exceed the values possibly stored in the Block Header
212  * field was indicated in Stream Header.
215  * the sizes possibly stored in the Block Header. Update the hash and
285 	s->crc32 = xz_crc32(b->in + s->in_start, in_used, s->crc32);
301 		ret = dec_vli(s, b->in, &b->in_pos, b->in_size);
314 			 * there were Blocks in the Stream.
352 		if (((s->crc32 >> s->pos) & 0xFF) != b->in[b->in_pos++])
466 	 * in the chain, so we catch that with the same test.
554 	 * Store the start position for the case when we are in the middle
567 			 * simple. Similar approach is used in many places
568 			 * in this file.
576 			 * to continue decoding if working in multi-call
594 			if (b->in[b->in_pos] == 0) {
605 				= ((uint32_t)b->in[b->in_pos] + 1) * 4;
646 				if (b->in[b->in_pos++] != 0)
688 				if (b->in[b->in_pos++] != 0)
726  * xz_dec_run() is a wrapper for dec_main() to handle some special cases in
742  * file is corrupt in a way that decoding it produces too big output.
746  * be any valid uncompressed data in the output buffer unless the decoding