libstrfunc.c
Go to the documentation of this file.00001
00002
00003
00004 #include "define.h"
00005
00006
00007 static char base64_code_chars[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/==";
00008
00009 static void base64_append(char **ou, int *line_count, char data);
00010 static void base64_append(char **ou, int *line_count, char data)
00011 {
00012 if (*line_count == 76) {
00013 *(*ou)++ = '\n';
00014 *line_count = 0;
00015 }
00016 *(*ou)++ = data;
00017 if (*line_count >= 0) (*line_count)++;
00018 }
00019
00020
00021 char *pst_base64_encode(void *data, size_t size)
00022 {
00023 int line_count = 0;
00024 return pst_base64_encode_multiple(data, size, &line_count);
00025 }
00026
00027
00028 char *pst_base64_encode_single(void *data, size_t size)
00029 {
00030 int line_count = -1;
00031 return pst_base64_encode_multiple(data, size, &line_count);
00032 }
00033
00034
00035 char *pst_base64_encode_multiple(void *data, size_t size, int *line_count)
00036 {
00037 char *output;
00038 char *ou;
00039 unsigned char *p = (unsigned char *)data;
00040 unsigned char *dte = p + size;
00041
00042 if (data == NULL || size == 0) return NULL;
00043
00044 ou = output = (char *)malloc(size / 3 * 4 + (size / 57) + 6);
00045 if (!output) return NULL;
00046
00047 while((dte-p) >= 3) {
00048 unsigned char x = p[0];
00049 unsigned char y = p[1];
00050 unsigned char z = p[2];
00051 base64_append(&ou, line_count, base64_code_chars[ x >> 2 ]);
00052 base64_append(&ou, line_count, base64_code_chars[ ((x & 0x03) << 4) | (y >> 4) ]);
00053 base64_append(&ou, line_count, base64_code_chars[ ((y & 0x0F) << 2) | (z >> 6) ]);
00054 base64_append(&ou, line_count, base64_code_chars[ z & 0x3F ]);
00055 p+=3;
00056 };
00057 if ((dte-p) == 2) {
00058 base64_append(&ou, line_count, base64_code_chars[ *p >> 2 ]);
00059 base64_append(&ou, line_count, base64_code_chars[ ((*p & 0x03) << 4) | (p[1] >> 4) ]);
00060 base64_append(&ou, line_count, base64_code_chars[ ((p[1] & 0x0F) << 2) ]);
00061 base64_append(&ou, line_count, '=');
00062 } else if ((dte-p) == 1) {
00063 base64_append(&ou, line_count, base64_code_chars[ *p >> 2 ]);
00064 base64_append(&ou, line_count, base64_code_chars[ ((*p & 0x03) << 4) ]);
00065 base64_append(&ou, line_count, '=');
00066 base64_append(&ou, line_count, '=');
00067 };
00068
00069 *ou=0;
00070 return output;
00071 };
00072
00073