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/* SPDX-License-Identifier: Apache-2.0 */
/* Copyright 2025 Thorsten Töpper
*
* vim:ts=4:sw=4:expandtab
*/
#ifndef HEX_CONVERSION_H
#define HEX_CONVERSION_H
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef DEBUGBUILD
#include "output.h"
#endif
#define ishex_macro(c) ((c>='0' && c <= '9') || (c>='A' && c <= 'F') || (c>='a' && c <= 'f'))
int convert_line(char *s);
int ishex(unsigned char c);
int ishex_string(const char *s, size_t l);
unsigned char *convert_to_binary(char *hex, unsigned char *out);
char *convert_from_binary(unsigned char *bin, size_t l, char *out);
/* short inline functions are fine in header */
inline int convert_line(char *s) {
size_t i = 0, l = 0;
if (s == NULL)
return -1;
l=strlen(s);
for (i=0; i<l; i++) {
s[i] = (char)toupper(s[i]);
if ((s[i] == '\r' && (l-i<3)) || (s[i] == '\n' && i==l-1)) {
s[i] = '\0';
break;
}
}
return 0;
}
inline int ishex(unsigned char c) {
if ((c>='0' && c <= '9') || (c>='A' && c <= 'F') || (c>='a' && c <= 'f')) {
return 1;
}
return 0;
};
inline int ishex_string(const char *s, size_t l) {
size_t i = 0;
if (s == 0)
return 0;
if (l == 0)
l = strlen(s);
for (; i<l; i++) {
if ( ! ishex_macro(s[i]) )
return 0;
}
return 1;
}
inline unsigned char *convert_to_binary(char *hex, unsigned char *out) {
char tmp[3] = {0,0,0};
size_t length, i;
if (hex == NULL) return NULL;
length=strlen(hex);
if ( (length==0) || (length%2 == 1)) return NULL;
for (i=0; i<length; i++) {
if ( ! ishex_macro(hex[i]) ) {
#ifdef DEBUGBUILD
LOGERR("Incompatible string '%s'\n", hex);
#endif
return NULL;
}
}
if (out == NULL && ((out = calloc((length/2),sizeof(char))) == NULL)) {
#ifdef DEBUGBUILD
LOGERR("ERROR: Failed to allocate %lu bytes\n", (length/2));
#endif
return NULL;
}
for (i=0;i<length;i+=2) {
tmp[0] = hex[i];
tmp[1] = hex[i+1];
out[i/2] = (unsigned char) strtol(tmp, NULL, 16);
}
return out;
}
/* Use a large buffer and complex method, as with a simple
* way there regularly were corrupt results with gcc -O2. */
inline char *convert_from_binary(unsigned char *bin, size_t l, char *out) {
char tmp[24];
size_t i,pos;
if (bin == NULL || l == 0) return NULL;
if (out == NULL && (out = calloc(((l*2)+1),sizeof(char))) == NULL) {
#ifdef DEBUGBUILD
LOGERR("ERROR: Failed to allocate %lu bytes\n", ((l*2)+1));
#endif
return NULL;
}
for (i=0; i<l; i++) {
/* Keep in mind this format is not only two characters. */
sprintf(tmp, "%02X", (unsigned char)bin[i]);
pos=strlen(tmp);
out[i*2] = tmp[pos-2];
out[(i*2)+1] = tmp[pos-1];
}
return out;
}
#endif
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