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+// hexa.cc
+// robert - programme du robot 2005. {{{
+//
+// Copyright (C) 2005 Nicolas Schodet
+//
+// Robot APB Team/Efrei 2005.
+// Web: http://assos.efrei.fr/robot/
+// Email: robot AT efrei DOT fr
+//
+// This program 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 2 of the License, or
+// (at your option) any later version.
+//
+// This program 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 this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+//
+// }}}
+#include "hexa.hh"
+
+// Table de conversion en hexa.
+static const char *digit2hexTbl_ = "0123456789abcdef";
+
+// Table de conversion depuis l'hexa.
+#define hI hexInvalid
+static const int hex2digitTbl_[] =
+{
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 0-15 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 16-31 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 32-47 */
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,hI,hI,hI,hI,hI,hI, /* 48-63 */
+ hI,10,11,12,13,14,15,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 64-79 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 80-95 */
+ hI,10,11,12,13,14,15,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 96-111 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 112-127 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 128-143 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 144-159 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 160-175 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 176-191 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 192-207 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 208-223 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 224-239 */
+ hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI,hI, /* 240-255 */
+};
+
+/// Converti un caractère hexa (0-9a-f) en chiffre (0-15).
+int
+hex2digit (char c)
+{
+ return hex2digitTbl_[c];
+}
+
+/// Converti un chiffre (0-15) en hexa (0-9a-f).
+char
+digit2hex (int d)
+{
+ return digit2hexTbl_[d];
+}
+
+/// Décode un mot non-signé (1 octets).
+unsigned int
+hexUnsignedChar2int (const char *s)
+{
+ int h1 = hex2digit (s[0]);
+ int h0 = hex2digit (s[1]);
+ if (h1 == hexInvalid || h0 == hexInvalid)
+ return hexInvalid;
+ return (unsigned char) (h1 << 4 | h0);
+}
+
+/// Décode un mot signé (1 octets).
+int
+hexSignedChar2int (const char *s)
+{
+ int h1 = hex2digit (s[0]);
+ int h0 = hex2digit (s[1]);
+ if (h1 == hexInvalid || h0 == hexInvalid)
+ return hexInvalid;
+ return (signed char) (h1 << 4 | h0);
+}
+
+/// Décode un mot non-signé (2 octets).
+int
+hexUnsignedShort2int (const char *s)
+{
+ int h3 = hex2digit (s[0]);
+ int h2 = hex2digit (s[1]);
+ int h1 = hex2digit (s[2]);
+ int h0 = hex2digit (s[3]);
+ if (h3 == hexInvalid || h2 == hexInvalid || h1 == hexInvalid || h0 == hexInvalid)
+ return hexInvalid;
+ return (unsigned short) (h3 << 12 | h2 << 8 | h1 << 4 | h0);
+}
+
+/// Décode un mot signé (2 octets).
+int
+hexSignedShort2int (const char *s)
+{
+ int h3 = hex2digit (s[0]);
+ int h2 = hex2digit (s[1]);
+ int h1 = hex2digit (s[2]);
+ int h0 = hex2digit (s[3]);
+ if (h3 == hexInvalid || h2 == hexInvalid || h1 == hexInvalid || h0 == hexInvalid)
+ return hexInvalid;
+ return (short) (h3 << 12 | h2 << 8 | h1 << 4 | h0);
+}
+