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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-08-18 16:09:31 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-08-18 22:53:32 +0200
commit50385e06ec207af0171c021f1909e9ef38c00519 (patch)
tree690bfe53cef9f901c68f76f4fe50c1917e368fe2 /lib/util
parent58c5d7c933a714096ef0dd42bd1446a6e1a25a16 (diff)
Replace update_crc32 helper function with crc32 from zlib
It is optimized to the maximum and if we already use zlib anyway, why not use zlib crc32? This also makes zlib a hard dependency which also means the whole "do we have a compressor" sanity check in the build system can be removed. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/util')
-rw-r--r--lib/util/crc32.c36
1 files changed, 0 insertions, 36 deletions
diff --git a/lib/util/crc32.c b/lib/util/crc32.c
deleted file mode 100644
index 27c5b85..0000000
--- a/lib/util/crc32.c
+++ /dev/null
@@ -1,36 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * crc32.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-#include "util.h"
-
-/*
- Karl Malbrain's compact CRC-32. See "A compact CCITT crc16 and crc32 C
- implementation that balances processor cache usage against speed"
- */
-static const uint32_t s_crc32[16] = {
- 0x00000000, 0x1DB71064, 0x3B6E20C8, 0x26D930AC,
- 0x76DC4190, 0x6B6B51F4, 0x4DB26158, 0x5005713C,
- 0xEDB88320, 0xF00F9344, 0xD6D6A3E8, 0xCB61B38C,
- 0x9B64C2B0, 0x86D3D2D4, 0xA00AE278, 0xBDBDF21C
-};
-
-uint32_t update_crc32(uint32_t crc, const void *data, size_t size)
-{
- const uint8_t *ptr = data;
- uint8_t b;
-
- crc = ~crc;
-
- while (size--) {
- b = *ptr++;
-
- crc = (crc >> 4) ^ s_crc32[(crc & 0x0F) ^ (b & 0x0F)];
- crc = (crc >> 4) ^ s_crc32[(crc & 0x0F) ^ (b >> 4)];
- }
-
- return ~crc;
-}