diff options
Diffstat (limited to 'entry/src/base64.cpp')
| -rw-r--r-- | entry/src/base64.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/entry/src/base64.cpp b/entry/src/base64.cpp new file mode 100644 index 0000000..b38e169 --- /dev/null +++ b/entry/src/base64.cpp @@ -0,0 +1,143 @@ + +/* + base64.c - by Joe DF ([email protected]) + Released under the MIT License + + See "base64.h", for more information. + + Thank you for inspiration: + http://www.codeproject.com/Tips/813146/Fast-base-functions-for-encode-decode +*/ + +#include "base64.h" +#include <stdio.h> +#include <algorithm> + +//Base64 char table - used internally for encoding +unsigned char b64_chr[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +unsigned int b64_int(unsigned int ch) { + + // ASCII to base64_int + // 65-90 Upper Case >> 0-25 + // 97-122 Lower Case >> 26-51 + // 48-57 Numbers >> 52-61 + // 43 Plus (+) >> 62 + // 47 Slash (/) >> 63 + // 61 Equal (=) >> 64~ + if (ch==43) + return 62; + if (ch==47) + return 63; + if (ch==61) + return 64; + if ((ch>47) && (ch<58)) + return ch + 4; + if ((ch>64) && (ch<91)) + return ch - 'A'; + if ((ch>96) && (ch<123)) + return (ch - 'a') + 26; + return 0; +} + +/* +unsigned int b64e_size(unsigned int in_size) { + + // size equals 4*floor((1/3)*(in_size+2)); + int i, j = 0; + for (i=0;i<in_size;i++) { + if (i % 3 == 0) + j += 1; + } + return (4*j); +} +*/ + +unsigned int b64d_size(unsigned int in_size) { + + return ((3*in_size)/4); +} + +unsigned int b64_encode(const unsigned char* in, unsigned int in_len, unsigned char* out) { + + unsigned int i=0, j=0, k=0, s[3]; + + for (i=0;i<in_len;i++) { + s[j++]=*(in+i); + if (j==3) { + out[k+0] = b64_chr[ (s[0]&255)>>2 ]; + out[k+1] = b64_chr[ ((s[0]&0x03)<<4)+((s[1]&0xF0)>>4) ]; + out[k+2] = b64_chr[ ((s[1]&0x0F)<<2)+((s[2]&0xC0)>>6) ]; + out[k+3] = b64_chr[ s[2]&0x3F ]; + j=0; k+=4; + } + } + + if (j) { + if (j==1) + s[1] = 0; + out[k+0] = b64_chr[ (s[0]&255)>>2 ]; + out[k+1] = b64_chr[ ((s[0]&0x03)<<4)+((s[1]&0xF0)>>4) ]; + if (j==2) + out[k+2] = b64_chr[ ((s[1]&0x0F)<<2) ]; + else + out[k+2] = '='; + out[k+3] = '='; + k+=4; + } + + out[k] = '\0'; + + return k; +} + +unsigned int b64_decode(const unsigned char* in, unsigned int in_len, unsigned char* out) { + + unsigned int i=0, j=0, k=0, s[4]; + + for (i=0;i<in_len;i++) { + s[j++]=b64_int(*(in+i)); + if (j==4) { + out[k+0] = ((s[0]&255)<<2)+((s[1]&0x30)>>4); + if (s[2]!=64) { + out[k+1] = ((s[1]&0x0F)<<4)+((s[2]&0x3C)>>2); + if ((s[3]!=64)) { + out[k+2] = ((s[2]&0x03)<<6)+(s[3]); k+=3; + } else { + k+=2; + } + } else { + k+=1; + } + j=0; + } + } + return k; +} + +int test(){ + unsigned char in_buff[100] = "ab\0d\0fghi"; + unsigned char out_buff[100]; + unsigned char *in = in_buff; + unsigned char *out = out_buff; + int in_len = 10; + int out_len = b64_encode(in, in_len, out); + printf("encode: out_len = %d\n", out_len); + for(int i = 0; i < out_len; i++){ + printf("%c ", out[i]); + } + printf("\n"); + std::swap(in, out); + in_len = out_len; + out_len = b64_decode(in, in_len, out); + printf("decode: out_len = %d\n", out_len); + for(int i = 0; i < out_len; i++){ + printf("%c ", out[i]); + } + printf("\n"); + return 0; +} + +int main(){ + test(); +}
\ No newline at end of file |