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Diffstat (limited to 'ld/ldcrc32.c')
| -rw-r--r-- | ld/ldcrc32.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/ld/ldcrc32.c b/ld/ldcrc32.c deleted file mode 100644 index 8b7de1d..0000000 --- a/ld/ldcrc32.c +++ /dev/null @@ -1,179 +0,0 @@ -/* - * Library: ldlibcrc - * Author: Lammert Bies, Bastian Molkenthin, Ulf Samuelsson - * - * This file is licensed under the MIT License as stated below - * - * Copyright (c) 2016 Lammert Bies - * Copyright (c) 2013 Ulf Samuelsson (ulf@emagii.com) - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in all - * copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - * - */ - -#include "sysdep.h" -#include "bfd.h" -#include "lddigest.h" -#include "ldreflect.h" - -#define SHIFT(t) ((sizeof(t)-1)*8) -/* ============ CRC-32 LIBCRC functions ======================================*/ - -/* - * void _init_crc32_tab (uint32_t *crc_tab, uint32_t poly); - * - * For optimal speed, the CRC32 calculation uses a table with pre-calculated - * bit patterns which are used in the XOR operations in the program. - * _init_crc32_tab is copyright (c) 2016 Lammert Bies - */ -static void -_init_crc32_tab (uint32_t * crc_tab, uint32_t poly) -{ - uint32_t crc; - uint32_t shift = SHIFT (uint32_t); - for (uint32_t i = 0; i < 256; i++) - { - crc = i << shift; - for (uint32_t j = 0; j < 8; j++) - { - if ((crc & 0x80000000u) != 0) - { - crc = (crc << 1) ^ poly; - } - else - { - crc = crc << 1; - } - } - crc_tab[i] = crc; - } -} /* _init_crc32__tab */ - -/* - * void _init_crc32_reciprocal_tab (uint32_t *crc_tab, uint32_t poly); - * - * For optimal speed, the CRC32 calculation uses a table with pre-calculated - * bit patterns which are used in the XOR operations in the program. - * _init_crc32_reciprocal_tab is copyright (c) 2021 Bastian Molkenthin - */ -static void -_init_crc32_reciprocal_tab (uint32_t * crc_tab, uint32_t poly) -{ - uint32_t crc; - uint32_t reflected_poly = reflect32 (poly); - for (uint32_t i = 0; i < 256; i++) - { - crc = i; - for (uint32_t j = 0; j < 8; j++) - { - if (crc & 0x00000001U) - { - crc >>= 1; - crc ^= reflected_poly; - } - else - { - crc = crc >> 1; - } - } - crc_tab[i] = crc; - } -} /* _init_crc32_reciprocal_tab */ - -/* - * void init_crc32_tab( void ); - * - * For optimal speed, the CRC32 calculation uses a table with pre-calculated - * bit patterns which are used in the XOR operations in the program. - * The table can be calculated in a normal or a reciprocal version. - * init_crc64_tab is copyright (c) 2023 Ulf Samuelsson - */ -uint32_t * -init_crc32_tab (algorithm_desc_t * dsc) -{ - uint32_t *crc_tab = malloc (256 * sizeof (uint32_t)); - - if (crc_tab == NULL) - return NULL; - - if (dsc->reciprocal) - { - _init_crc32_reciprocal_tab (crc_tab, dsc->poly.d32._0); - } - else - { - _init_crc32_tab (crc_tab, dsc->poly.d32._0); - } - - return crc_tab; -} /* init_crc32_tab */ - -/* - * uint32_t calc_crc32(algorithm_desc_t *dsc, const unsigned char *input_str, size_t num_bytes); - * - * The function calc_crc32() calculates in one pass the common 32 bit CRC value for - * a byte string that is passed to the function together with a parameter - * indicating the length. - * calc_crc32 is - * copyright (c) 2016 Lammert Bies - * copyright (c) 2021 Bastian Molkenthin - * copyright (c) 2023 Ulf Samuelsson - */ -uint32_t -calc_crc32 (algorithm_desc_t * dsc, const unsigned char *input_str, - size_t num_bytes) -{ - uint32_t crc; - const unsigned char *ptr; - uint32_t index; - uint32_t *crc_tab = dsc->crc_tab; - - if ((ptr = input_str) == NULL) - return 0; - - if (crc_tab == NULL) - return 0; - - crc = dsc->initial.d32._0; - - if (dsc->reciprocal) - { - for (uint32_t i = 0; i < num_bytes; i++) - { - index = ((crc >> 0) ^ (uint32_t) * ptr++) & 0x000000FFul; - crc = (crc >> 8) ^ crc_tab[index]; - } - } - else - { - uint32_t shift = SHIFT (uint32_t); - for (uint32_t i = 0; i < num_bytes; i++) - { - const unsigned char c = *ptr++; - uint32_t rc = (uint32_t) (dsc->ireflect ? reflect8 (c) : c); - crc = (crc ^ (rc << shift)); - index = (uint32_t) (crc >> shift); - crc = (crc << 8); - crc = (crc ^ (crc_tab[index])); - } - } - crc = (dsc->oreflect ? reflect32 (crc) : crc); - crc = crc ^ dsc->xor_val.d32._0; - return crc; -} /* calc_crc32 */ |