X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Flzx_compress.c;h=ec90ba1640cc0a11f18b1b848e5dfee28e915356;hb=8d91746c5772779e0e0593112c0143284452ee6e;hp=33943af7fa41d1e4d4cb3f4a66bdbc4acd27e93e;hpb=7ea97f5338e7fd6b19dbb7df4e8e333d286d8ac2;p=wimlib

diff --git a/src/lzx_compress.c b/src/lzx_compress.c
index 33943af7..ec90ba16 100644
--- a/src/lzx_compress.c
+++ b/src/lzx_compress.c
@@ -410,8 +410,10 @@ struct lzx_compressor {
 
 	/* The matches and literals that the parser has chosen for the current
 	 * block.  The required length of this array is limited by the maximum
-	 * number of matches that can ever be chosen for a single block.  */
-	struct lzx_sequence chosen_sequences[DIV_ROUND_UP(LZX_DIV_BLOCK_SIZE, LZX_MIN_MATCH_LEN)];
+	 * number of matches that can ever be chosen for a single block, plus
+	 * one for the special entry at the end.  */
+	struct lzx_sequence chosen_sequences[
+		       DIV_ROUND_UP(LZX_DIV_BLOCK_SIZE, LZX_MIN_MATCH_LEN) + 1];
 
 	/* Tables for mapping adjusted offsets to offset slots  */
 
@@ -548,7 +550,7 @@ struct lzx_output_bitstream {
 
 /* Can the specified number of bits always be added to 'bitbuf' after any
  * pending 16-bit coding units have been flushed?  */
-#define CAN_BUFFER(n)	((n) <= (8 * sizeof(machine_word_t)) - 16)
+#define CAN_BUFFER(n)	((n) <= (8 * sizeof(machine_word_t)) - 15)
 
 /*
  * Initialize the output bitstream.
@@ -994,6 +996,8 @@ lzx_write_sequences(struct lzx_output_bitstream *os, int block_type,
 			if (!CAN_BUFFER(MAX_MATCH_BITS))
 				lzx_flush_bits(os, ALIGNED_CODEWORD_LIMIT);
 		} else {
+			STATIC_ASSERT(CAN_BUFFER(17));
+
 			lzx_add_bits(os, extra_bits, num_extra_bits);
 			if (!CAN_BUFFER(MAX_MATCH_BITS))
 				lzx_flush_bits(os, 17);
@@ -1809,7 +1813,7 @@ lzx_compress_near_optimal(struct lzx_compressor *c,
 			if (unlikely(max_len > in_end - in_next)) {
 				max_len = in_end - in_next;
 				nice_len = min(max_len, nice_len);
-				if (unlikely(max_len < 5)) {
+				if (unlikely(max_len < BT_MATCHFINDER_REQUIRED_NBYTES)) {
 					in_next++;
 					cache_ptr->length = 0;
 					cache_ptr++;
@@ -1849,7 +1853,7 @@ lzx_compress_near_optimal(struct lzx_compressor *c,
 					if (unlikely(max_len > in_end - in_next)) {
 						max_len = in_end - in_next;
 						nice_len = min(max_len, nice_len);
-						if (unlikely(max_len < 5)) {
+						if (unlikely(max_len < BT_MATCHFINDER_REQUIRED_NBYTES)) {
 							in_next++;
 							cache_ptr->length = 0;
 							cache_ptr++;