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Diffstat (limited to 'nanohttp/nanohttp-base64.c')
| -rw-r--r-- | nanohttp/nanohttp-base64.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/nanohttp/nanohttp-base64.c b/nanohttp/nanohttp-base64.c new file mode 100644 index 0000000..f81039c --- /dev/null +++ b/nanohttp/nanohttp-base64.c @@ -0,0 +1,143 @@ +/****************************************************************** +* $Id: nanohttp-base64.c,v 1.1 2006/02/19 22:22:41 snowdrop Exp $ +* +* CSOAP Project: A http client/server library in C +* Copyright (C) 2003 Ferhat Ayaz +* +* This library is free software; you can redistribute it and/or +* modify it under the terms of the GNU Library General Public +* License as published by the Free Software Foundation; either +* version 2 of the License, or (at your option) any later version. +* +* This library 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 +* Library General Public License for more details. +* +* You should have received a copy of the GNU Library General Public +* License along with this library; if not, write to the +* Free Software Foundation, Inc., 59 Temple Place - Suite 330, +* Boston, MA 02111-1307, USA. +* +* Email: hero@persua.de +******************************************************************/ +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +static const char cb64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +static const char cd64[] = "|$$$}rstuvwxyz{$$$$$$$>?@ABCDEFGHIJKLMNOPQRSTUVW$$$$$$XYZ[\\]^_`abcdefghijklmnopq"; + +/** + * encode 3 8-bit binary bytes as 4 '6-bit' characters + */ +static void encodeblock(unsigned char in[3], unsigned char out[4], int len) +{ + out[0] = cb64[in[0] >> 2]; + out[1] = cb64[((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4)]; + out[2] = (unsigned char)(len > 1 ? cb64[((in[1] & 0x0f) << 2) | ((in[2] & 0xc0) >> 6)] : '='); + out[3] = (unsigned char)(len > 2 ? cb64[in[2] & 0x3f] : '='); + + return; +} + +/** + * base64 encode a string. + */ +void base64_encode(const unsigned char *instr, unsigned char *outstr) +{ + unsigned char in[3], out[4]; + int i, len; + + while (*instr) { + + len = 0; + for (i = 0; i < 3; i++) { + in[i] = (unsigned char)*instr++; + if (*instr) { + len++; + } + else { + in[i] = 0; + } + } + if (len) { + encodeblock(in, out, len); + for (i = 0; i < 4; i++) { + *outstr++ = out[i]; + } + } + } +} + +/** + * decode 4 '6-bit' characters into 3 8-bit binary bytes + */ +static void decodeblock(unsigned char in[4], unsigned char out[3]) +{ + out[0] = (unsigned char)(in[0] << 2 | in[1] >> 4); + out[1] = (unsigned char)(in[1] << 4 | in[2] >> 2); + out[2] = (unsigned char)(((in[2] << 6) & 0xc0) | in[3]); + + return; +} + +/** + * decode a base64 encoded string (maybe broken...) + */ +void base64_decode(const unsigned char *instr, unsigned char *outstr) +{ + unsigned char in[4], out[3], v; + int i, len; + + while (*instr) { + for (len = 0, i = 0; i < 4 && *instr; i++) { + v = 0; + while (*instr && v == 0) { + v = *instr++; + v = (unsigned char)((v < 43 || v > 122) ? 0 : cd64[v - 43]); + if (v) { + v = (unsigned char)((v == '$') ? 0 : v - 61); + } + } + if (*instr) { + len++; + if (v) { + in[i] = (unsigned char)(v - 1); + } + } + else { + in[i] = 0; + } + } + if (len) { + decodeblock(in, out); + for (i = 0; i < len - 1; i++) { + *outstr++ = out[i]; + } + } + } +} + +#ifdef BASE64_TEST_CASE_FROM_RFC2617 +int main(int argc, char **argv) { + + + unsigned char *instr = "QWxhZGRpbjpvcGVuIHNlc2FtZQ=="; + unsigned char instr2[80]; + unsigned char outstr[80]; + + bzero(outstr, 80); + + base64_decode(instr, outstr); + + printf("\"%s\" => \"%s\"\n", instr, outstr); + + strcpy(instr2, outstr); + + base64_encode(instr2, outstr); + + return printf("\"%s\" => \"%s\"\n", instr2, outstr); +} +#endif |