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>

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;
-}