From 16e64105ff539acda5bdf6e8dedb20496038e629 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Wed, 5 Jan 2022 23:06:06 +0100 Subject: First commit MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- libblake_decode_hex.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 libblake_decode_hex.c (limited to 'libblake_decode_hex.c') diff --git a/libblake_decode_hex.c b/libblake_decode_hex.c new file mode 100644 index 0000000..4243d82 --- /dev/null +++ b/libblake_decode_hex.c @@ -0,0 +1,35 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + +size_t +libblake_decode_hex(const char *data, size_t n, void *out_) +{ + unsigned char *out = out_, value; + size_t i, j = 0; + int odd = 0; + + if (!out) { + for (i = 0; i < n && data[i]; i++) { + if (isxdigit(data[i])) { + j += (size_t)odd; + odd ^= 1; + } + } + return j; + } + + for (i = 0; i < n && data[i]; i++) { + if (isxdigit(data[i])) { + value = (unsigned char)((data[i] & 15) + (data[i] > '9' ? 9 : 0)); + if (!odd) { + out[j] = (unsigned char)(value << 4); + odd = 1; + } else { + out[j++] |= value; + odd = 0; + } + } + } + + return j; +} -- cgit v1.2.3-70-g09d2