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author | Riku Nomoto <riku_nomoto@mail.toyota.co.jp> | 2020-11-19 12:45:32 +0900 |
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committer | Riku Nomoto <riku_nomoto@mail.toyota.co.jp> | 2020-11-19 12:45:32 +0900 |
commit | 8e0e00d21146a84c18f9cf9409e187b4fb0248aa (patch) | |
tree | ef791689dad216ac61091a1d1bd3b928d563aba6 /video_in_hal/nsframework/backup_manager/server/src/bkup_crc32.cpp | |
parent | 18df6e21c6743a137e2760c52ca89d0789e90417 (diff) |
Init basesystem source codes.
Signed-off-by: Riku Nomoto <riku_nomoto@mail.toyota.co.jp>
Change-Id: I55aa2f1406ce7f751ae14140b613b53b68995528
Diffstat (limited to 'video_in_hal/nsframework/backup_manager/server/src/bkup_crc32.cpp')
-rwxr-xr-x | video_in_hal/nsframework/backup_manager/server/src/bkup_crc32.cpp | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/video_in_hal/nsframework/backup_manager/server/src/bkup_crc32.cpp b/video_in_hal/nsframework/backup_manager/server/src/bkup_crc32.cpp new file mode 100755 index 0000000..f1d8449 --- /dev/null +++ b/video_in_hal/nsframework/backup_manager/server/src/bkup_crc32.cpp @@ -0,0 +1,62 @@ +/* + * @copyright Copyright (c) 2016-2020 TOYOTA MOTOR CORPORATION. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <cstdio> +#include "bkup_crc32.h" +#include "bkup_util.h" + +/* + * CRC-32C lookup table + * + * Polynomial 0x1EDC6F41 + */ +static const uint32_t kBkupCrc32Lookup[4][256] = { + { + }, + { + }, + { + }, + { + } +}; + +/** + * compute CRC-32C (Slicing-by-4) + */ +uint32_t BkupCrc32(const void *data, size_t length) { + uint32_t crc = 0xFFFFFFFF; + const uint32_t *current = (const uint32_t *)data; + + if (data == NULL) { + return -1; + } + while (length >= 4) { + uint32_t one = *current++ ^ crc; + crc = kBkupCrc32Lookup[0][(one >> 24) & 0xFF] ^ + kBkupCrc32Lookup[1][(one >> 16) & 0xFF] ^ + kBkupCrc32Lookup[2][(one >> 8) & 0xFF] ^ + kBkupCrc32Lookup[3][one & 0xFF]; + length -= 4; + } + + const uint8_t *current_char = (const uint8_t *)current; + while (length-- > 0) { + crc = (crc >> 8) ^ kBkupCrc32Lookup[0][(crc & 0xFF) ^ *current_char++]; + } + + return ~crc; +} |