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author | Bjørn Lindeijer <bjorn@lindeijer.nl> | 2005-02-05 11:06:38 +0000 |
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committer | Bjørn Lindeijer <bjorn@lindeijer.nl> | 2005-02-05 11:06:38 +0000 |
commit | 46129aab7f641016c3658c3a048a3939ae2214e9 (patch) | |
tree | 0aff0bb1667b3af32294b585977da7fa54e94c49 /src/base64.cpp | |
parent | d6b9d63fa26271de099ddc4c08cdc6b5587f37ec (diff) | |
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Added base64 encoding and decoding code.
Diffstat (limited to 'src/base64.cpp')
-rw-r--r-- | src/base64.cpp | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/base64.cpp b/src/base64.cpp new file mode 100644 index 00000000..57f2c9bb --- /dev/null +++ b/src/base64.cpp @@ -0,0 +1,104 @@ +/* + * This file 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 + * any later version. + * + * This file 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 file; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * $Id$ + */ + +#include "base64.h" +#include <ctype.h> + +static const char base64digits[] = +"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +#define BAD -1 + +static const char base64val[] = { + BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, + BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, + BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD, 62, BAD,BAD,BAD, 63, + 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,BAD,BAD, BAD,BAD,BAD,BAD, + BAD, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, + 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,BAD, BAD,BAD,BAD,BAD, + BAD, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, + 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,BAD, BAD,BAD,BAD,BAD +}; + +#define DECODE64(c) (isascii(c) ? base64val[c] : BAD) + +void to64frombits(unsigned char *out, const unsigned char *in, int inlen) +{ + for (; inlen >= 3; inlen -= 3) + { + *out++ = base64digits[in[0] >> 2]; + *out++ = base64digits[((in[0] << 4) & 0x30) | (in[1] >> 4)]; + *out++ = base64digits[((in[1] << 2) & 0x3c) | (in[2] >> 6)]; + *out++ = base64digits[in[2] & 0x3f]; + in += 3; + } + if (inlen > 0) + { + unsigned char fragment; + + *out++ = base64digits[in[0] >> 2]; + fragment = (in[0] << 4) & 0x30; + if (inlen > 1) + fragment |= in[1] >> 4; + *out++ = base64digits[fragment]; + *out++ = (inlen < 2) ? '=' : base64digits[(in[1] << 2) & 0x3c]; + *out++ = '='; + } + *out = '\0'; +} + +int from64tobits(char *out, const char *in) +{ + int len = 0; + register unsigned char digit1, digit2, digit3, digit4; + + if (in[0] == '+' && in[1] == ' ') + in += 2; + if (*in == '\r') + return(0); + + do { + digit1 = in[0]; + if (DECODE64(digit1) == BAD) + return(-1); + digit2 = in[1]; + if (DECODE64(digit2) == BAD) + return(-1); + digit3 = in[2]; + if (digit3 != '=' && DECODE64(digit3) == BAD) + return(-1); + digit4 = in[3]; + if (digit4 != '=' && DECODE64(digit4) == BAD) + return(-1); + in += 4; + *out++ = (DECODE64(digit1) << 2) | (DECODE64(digit2) >> 4); + ++len; + if (digit3 != '=') + { + *out++ = ((DECODE64(digit2) << 4) & 0xf0) | (DECODE64(digit3) >> 2); + ++len; + if (digit4 != '=') + { + *out++ = ((DECODE64(digit3) << 6) & 0xc0) | DECODE64(digit4); + ++len; + } + } + } while (*in && *in != '\r' && digit4 != '='); + + return (len); +} |