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lib/compression/lzhuff: add debug flag to skip LZ77

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Encoding without LZ77 matches is valid, and it is useful for isolating
bugs.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
This commit is contained in:
Douglas Bagnall 2022-11-21 10:23:53 +13:00 committed by Joseph Sutton
parent d4e3f0c88e
commit 955214ef6e
1 changed files with 10 additions and 1 deletions
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11
lib/compression/lzxpress_huffman.c
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@ -31,6 +31,15 @@
#include "lib/util/byteorder.h"
#include "lib/util/bytearray.h"
/*
* DEBUG_NO_LZ77_MATCHES toggles the encoding of matches as matches. If it is
* false the potential match is written as a series of literals, which is a
* valid but usually inefficient encoding. This is useful for isolating a
* problem to either the LZ77 or the Huffman stage.
*/
#ifndef DEBUG_NO_LZ77_MATCHES
#define DEBUG_NO_LZ77_MATCHES false
#endif
#define LZXPRESS_ERROR -1LL
@ -574,7 +583,7 @@ static ssize_t lz77_encode_block(struct lzxhuff_compressor_context *cmp_ctx,
j = 0;
if (remaining_size < 41) {
if (remaining_size < 41 || DEBUG_NO_LZ77_MATCHES) {
/*
* There is no point doing a hash table and looking for
* matches in this tiny block (remembering we are committed to