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681d8cd9ea
This deduplicate two identical bytes_to_hex implementation into one. The intention is to ease the introduction of a new hash algorithm, which will also have its formatting helper (to ensure seamless transition from sha1). Note that the new functions always take the size of the binary buffer, unlike the old disk_cache_format_hex_id which took `binary * 2` which was inconsistent (binary size is `binary` and string size is `binary * 2 + 1`). Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22527>
69 lines
No EOL
2.2 KiB
C
69 lines
No EOL
2.2 KiB
C
/* Copyright © 2023 Valve Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef UTIL_HEX_H
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#define UTIL_HEX_H
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#include <stdlib.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Convert a binary buffer of length `len` to a hexadecimal string of length
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* `len * 2 + 1` (including NUL terminator).
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*/
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static inline char *mesa_bytes_to_hex(char *buf, const unsigned char *binary,
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unsigned len) {
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static const char hex_digits[] = "0123456789abcdef";
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unsigned i;
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for (i = 0; i < len * 2; i += 2) {
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buf[i] = hex_digits[binary[i >> 1] >> 4];
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buf[i + 1] = hex_digits[binary[i >> 1] & 0x0f];
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}
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buf[i] = '\0';
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return buf;
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}
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/*
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* Read `len` pairs of hexadecimal digits from `hex` and write the values to
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* `binary` as `len` bytes.
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*/
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static inline void mesa_hex_to_bytes(unsigned char *buf, const char *hex,
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unsigned len) {
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for (unsigned i = 0; i < len; i++) {
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char tmp[3];
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tmp[0] = hex[i * 2];
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tmp[1] = hex[(i * 2) + 1];
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tmp[2] = '\0';
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buf[i] = strtol(tmp, NULL, 16);
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}
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}
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#ifdef __cplusplus
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}
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#endif
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#endif |