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/* Chrysalide - Outil d'analyse de fichiers binaires
* hex.c - construction et interprétation de chaînes hexadécimales
*
* Copyright (C) 2021 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* Chrysalide is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Chrysalide is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Chrysalide. If not, see <http://www.gnu.org/licenses/>.
*/
#include "hex.h"
#include <ctype.h>
/******************************************************************************
* *
* Paramètres : src = source de données à considérer. *
* len = quantité de ces données à traiter. *
* lower = spécifie un encodage à l'aide de minuscules. *
* dst = zone allouée pour les données résultantes. [OUT] *
* *
* Description : Encode des données en chaîne hexadécimale. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
void encode_hex(const char *src, size_t len, bool lower, char *dst)
{
size_t i; /* Boucle de parcours #1 */
uint8_t index; /* Indice de recherche */
/**
* base = "".join([ "%02X" % i for i in range(256) ])
* encoded = "\n".join([ base[i : i + 32] for i in range(0, 512, 32) ])
* print(encoded)
*/
const char encoding_lookup[] = {
"000102030405060708090A0B0C0D0E0F"
"101112131415161718191A1B1C1D1E1F"
"202122232425262728292A2B2C2D2E2F"
"303132333435363738393A3B3C3D3E3F"
"404142434445464748494A4B4C4D4E4F"
"505152535455565758595A5B5C5D5E5F"
"606162636465666768696A6B6C6D6E6F"
"707172737475767778797A7B7C7D7E7F"
"808182838485868788898A8B8C8D8E8F"
"909192939495969798999A9B9C9D9E9F"
"A0A1A2A3A4A5A6A7A8A9AAABACADAEAF"
"B0B1B2B3B4B5B6B7B8B9BABBBCBDBEBF"
"C0C1C2C3C4C5C6C7C8C9CACBCCCDCECF"
"D0D1D2D3D4D5D6D7D8D9DADBDCDDDEDF"
"E0E1E2E3E4E5E6E7E8E9EAEBECEDEEEF"
"F0F1F2F3F4F5F6F7F8F9FAFBFCFDFEFF"
};
for (i = 0; i < len; i++)
{
index = src[i];
if (lower)
{
(*dst++) = tolower(encoding_lookup[index * 2]);
(*dst++) = tolower(encoding_lookup[index * 2 + 1]);
}
else
{
(*dst++) = encoding_lookup[index * 2];
(*dst++) = encoding_lookup[index * 2 + 1];
}
}
*dst = '\0';
}
/******************************************************************************
* *
* Paramètres : digit = caractère hexadécimale à transcrire. *
* value = valeur récupérée. [OUT] *
* *
* Description : Décode un caractère hexadécimal. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool decode_hex_digit(const char *digit, uint8_t *value)
{
bool result; /* Validité à retourner */
switch (*digit)
{
case '0' ... '9':
*value = (*digit) - '0';
result = true;
break;
case 'a' ... 'f':
*value = 0xa + (*digit) - 'a';
result = true;
break;
case 'A' ... 'F':
*value = 0xa + (*digit) - 'A';
result = true;
break;
default:
result = false;
break;
}
return result;
}
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