From 50385e06ec207af0171c021f1909e9ef38c00519 Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Sun, 18 Aug 2019 16:09:31 +0200 Subject: 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 --- lib/util/crc32.c | 36 ------------------------------------ 1 file changed, 36 deletions(-) delete mode 100644 lib/util/crc32.c (limited to 'lib/util') 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 - */ -#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; -} -- cgit v1.2.3