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Refactor hex_to_bytes

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This commit is contained in:
Dimitri Lozeve 2020-06-02 21:36:42 +02:00
parent 2a2c19be37
commit 55d39b8625
2 changed files with 10 additions and 7 deletions
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16
utils.c
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@ -2,15 +2,17 @@
#include <ctype.h> #include <ctype.h>
#include <string.h> #include <string.h>
unsigned char hex_to_byte(const char c) {
if (isdigit(c)) {
return c - '0';
}
return 10 + c - 'a';
}
size_t hex_to_bytes(unsigned char *out, const char hex[static 1]) { size_t hex_to_bytes(unsigned char *out, const char hex[static 1]) {
for (size_t i = 0; i < strlen(hex); ++i) { for (size_t i = 0; i < strlen(hex); ++i) {
char c = tolower(hex[i]); char c = tolower(hex[i]);
unsigned char value; unsigned char value = hex_to_byte(c);
if (isdigit(c)) {
value = c - '0';
} else {
value = 10 + c - 'a';
}
if (i % 2 == 0) { if (i % 2 == 0) {
value <<= 4; value <<= 4;
} }
@ -20,7 +22,7 @@ size_t hex_to_bytes(unsigned char *out, const char hex[static 1]) {
} }
unsigned char *bytes_to_base64(unsigned char *out, unsigned char *bytes_to_base64(unsigned char *out,
const unsigned char in[static 1], size_t len) { const unsigned char in[static 1], size_t len) {
static const unsigned char base64_table[65] = static const unsigned char base64_table[65] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

1
utils.h
View file

@ -3,6 +3,7 @@
#include <stdlib.h> #include <stdlib.h>
unsigned char hex_to_byte(const char c);
size_t hex_to_bytes(unsigned char *out, const char hex[static 1]); size_t hex_to_bytes(unsigned char *out, const char hex[static 1]);
unsigned char *bytes_to_base64(unsigned char *out, unsigned char *bytes_to_base64(unsigned char *out,
const unsigned char in[static 1], size_t len); const unsigned char in[static 1], size_t len);