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Diffstat (limited to 'src/utils/base64.cpp')
| -rw-r--r-- | src/utils/base64.cpp | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/src/utils/base64.cpp b/src/utils/base64.cpp new file mode 100644 index 000000000..1221a7c7f --- /dev/null +++ b/src/utils/base64.cpp @@ -0,0 +1,170 @@ +/* + +----------------------------------------------------------------------+ + | PHP HTML Embedded Scripting Language Version 3.0 | + +----------------------------------------------------------------------+ + | Copyright (c) 1997-2000 PHP Development Team (See Credits file) | + +----------------------------------------------------------------------+ + | This program is free software; you can redistribute it and/or modify | + | it under the terms of one of the following licenses: | + | | + | A) 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. | + | | + | B) the PHP License as published by the PHP Development Team and | + | included in the distribution in the file: LICENSE | + | | + | 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 both licenses referred to here. | + | If you did not, or have any questions about PHP licensing, please | + | contact core@php.net. | + +----------------------------------------------------------------------+ + | Author: Jim Winstead (jimw@php.net) | + +----------------------------------------------------------------------+ + */ + +#include "utils/base64.h" + +#include <stdlib.h> +#include <string.h> + +static char base64_table[] = +{ + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', + 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', + 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', + 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', + '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '\0' +}; +static char base64_pad = '='; + +unsigned char *php3_base64_encode(const unsigned char *string, + int length, int *ret_length) +{ + const unsigned char *current = string; + int i = 0; + unsigned char *result = (unsigned char *)malloc( + ((length + 3 - length % 3) * 4 / 3 + 1) * sizeof(char)); + + while (length > 2) + { /* keep going until we have less than 24 bits */ + result[i++] = base64_table[current[0] >> 2]; + result[i++] = base64_table[((current[0] & 0x03) + << 4) + (current[1] >> 4)]; + result[i++] = base64_table[((current[1] & 0x0f) + << 2) + (current[2] >> 6)]; + result[i++] = base64_table[current[2] & 0x3f]; + + current += 3; + length -= 3; /* we just handle 3 octets of data */ + } + + /* now deal with the tail end of things */ + if (length != 0) + { + result[i++] = base64_table[current[0] >> 2]; + if (length > 1) + { + result[i++] = base64_table[((current[0] & 0x03) << 4) + + (current[1] >> 4)]; + result[i++] = base64_table[(current[1] & 0x0f) << 2]; + result[i++] = base64_pad; + } + else + { + result[i++] = base64_table[(current[0] & 0x03) << 4]; + result[i++] = base64_pad; + result[i++] = base64_pad; + } + } + if (ret_length) + { + *ret_length = i; + } + result[i] = '\0'; + return result; +} + +/* as above, but backwards. :) */ +unsigned char *php3_base64_decode(const unsigned char *string, + int length, int *ret_length) +{ + const unsigned char *current = string; + int ch, i = 0, j = 0, k; + char *chp; + + unsigned char *result = (unsigned char *)malloc(length + 1); + + if (result == NULL) + return NULL; + + /* run through the whole string, converting as we go */ + while ((ch = *current++) != '\0') + { + if (ch == base64_pad) break; + + /* When Base64 gets POSTed, all pluses are interpreted as spaces. + This line changes them back. It's not exactly the Base64 spec, + but it is completely compatible with it (the spec says that + spaces are invalid). This will also save many people considerable + headache. - Turadg Aleahmad <turadg@wise.berkeley.edu> + */ + + if (ch == ' ') ch = '+'; + + chp = strchr(base64_table, ch); + if (!chp) + continue; + ch = chp - base64_table; + + switch(i % 4) + { + case 0: + result[j] = ch << 2; + break; + case 1: + result[j++] |= ch >> 4; + result[j] = (ch & 0x0f) << 4; + break; + case 2: + result[j++] |= ch >>2; + result[j] = (ch & 0x03) << 6; + break; + case 3: + result[j++] |= ch; + break; + default: + break; + } + i++; + } + + k = j; + /* mop things up if we ended on a boundary */ + if (ch == base64_pad) + { + switch(i % 4) + { + case 0: + case 1: + free(result); + return 0; + case 2: + k++; + case 3: + result[k++] = 0; + default: + break; + } + } + if (ret_length) + { + *ret_length = j; + } + result[k] = '\0'; + return result; +} |