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Base64 split implementation in separate file (#23313)
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s-hadinger
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lib/default/base64-1.1.1/src/base64.cpp
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128
lib/default/base64-1.1.1/src/base64.cpp
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/**
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* Base64 encoding and decoding of strings. Uses '+' for 62, '/' for 63, '=' for padding
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*/
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#include "base64.hpp"
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unsigned char binary_to_base64(unsigned char v) {
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// Capital letters - 'A' is ascii 65 and base64 0
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if(v < 26) return v + 'A';
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// Lowercase letters - 'a' is ascii 97 and base64 26
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if(v < 52) return v + 71;
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// Digits - '0' is ascii 48 and base64 52
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if(v < 62) return v - 4;
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// '+' is ascii 43 and base64 62
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if(v == 62) return '+';
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// '/' is ascii 47 and base64 63
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if(v == 63) return '/';
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return 64;
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}
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unsigned char base64_to_binary(unsigned char c) {
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// Capital letters - 'A' is ascii 65 and base64 0
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if('A' <= c && c <= 'Z') return c - 'A';
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// Lowercase letters - 'a' is ascii 97 and base64 26
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if('a' <= c && c <= 'z') return c - 71;
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// Digits - '0' is ascii 48 and base64 52
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if('0' <= c && c <= '9') return c + 4;
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// '+' is ascii 43 and base64 62
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if(c == '+') return 62;
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// '/' is ascii 47 and base64 63
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if(c == '/') return 63;
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return 255;
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}
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unsigned int encode_base64_length(unsigned int input_length) {
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return (input_length + 2)/3*4;
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}
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unsigned int decode_base64_length(unsigned char input[]) {
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unsigned char *start = input;
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while(base64_to_binary(input[0]) < 64) {
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++input;
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}
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unsigned int input_length = input - start;
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unsigned int output_length = input_length/4*3;
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switch(input_length % 4) {
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default: return output_length;
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case 2: return output_length + 1;
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case 3: return output_length + 2;
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}
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}
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unsigned int encode_base64(unsigned char input[], unsigned int input_length, unsigned char output[]) {
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unsigned int full_sets = input_length/3;
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// While there are still full sets of 24 bits...
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for(unsigned int i = 0; i < full_sets; ++i) {
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output[0] = binary_to_base64( input[0] >> 2);
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output[1] = binary_to_base64((input[0] & 0x03) << 4 | input[1] >> 4);
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output[2] = binary_to_base64((input[1] & 0x0F) << 2 | input[2] >> 6);
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output[3] = binary_to_base64( input[2] & 0x3F);
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input += 3;
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output += 4;
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}
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switch(input_length % 3) {
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case 0:
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output[0] = '\0';
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break;
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case 1:
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output[0] = binary_to_base64( input[0] >> 2);
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output[1] = binary_to_base64((input[0] & 0x03) << 4);
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output[2] = '=';
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output[3] = '=';
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output[4] = '\0';
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break;
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case 2:
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output[0] = binary_to_base64( input[0] >> 2);
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output[1] = binary_to_base64((input[0] & 0x03) << 4 | input[1] >> 4);
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output[2] = binary_to_base64((input[1] & 0x0F) << 2);
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output[3] = '=';
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output[4] = '\0';
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break;
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}
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return encode_base64_length(input_length);
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}
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unsigned int decode_base64(unsigned char input[], unsigned char output[]) {
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unsigned int output_length = decode_base64_length(input);
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// While there are still full sets of 24 bits...
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for(unsigned int i = 2; i < output_length; i += 3) {
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output[0] = base64_to_binary(input[0]) << 2 | base64_to_binary(input[1]) >> 4;
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output[1] = base64_to_binary(input[1]) << 4 | base64_to_binary(input[2]) >> 2;
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output[2] = base64_to_binary(input[2]) << 6 | base64_to_binary(input[3]);
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input += 4;
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output += 3;
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}
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switch(output_length % 3) {
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case 1:
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output[0] = base64_to_binary(input[0]) << 2 | base64_to_binary(input[1]) >> 4;
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break;
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case 2:
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output[0] = base64_to_binary(input[0]) << 2 | base64_to_binary(input[1]) >> 4;
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output[1] = base64_to_binary(input[1]) << 4 | base64_to_binary(input[2]) >> 2;
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break;
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}
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return output_length;
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}
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@ -69,127 +69,4 @@ unsigned int encode_base64(unsigned char input[], unsigned int input_length, uns
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*/
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unsigned int decode_base64(unsigned char input[], unsigned char output[]);
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unsigned char binary_to_base64(unsigned char v) {
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// Capital letters - 'A' is ascii 65 and base64 0
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if(v < 26) return v + 'A';
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// Lowercase letters - 'a' is ascii 97 and base64 26
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if(v < 52) return v + 71;
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// Digits - '0' is ascii 48 and base64 52
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if(v < 62) return v - 4;
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// '+' is ascii 43 and base64 62
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if(v == 62) return '+';
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// '/' is ascii 47 and base64 63
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if(v == 63) return '/';
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return 64;
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}
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unsigned char base64_to_binary(unsigned char c) {
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// Capital letters - 'A' is ascii 65 and base64 0
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if('A' <= c && c <= 'Z') return c - 'A';
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// Lowercase letters - 'a' is ascii 97 and base64 26
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if('a' <= c && c <= 'z') return c - 71;
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// Digits - '0' is ascii 48 and base64 52
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if('0' <= c && c <= '9') return c + 4;
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// '+' is ascii 43 and base64 62
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if(c == '+') return 62;
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// '/' is ascii 47 and base64 63
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if(c == '/') return 63;
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return 255;
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}
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unsigned int encode_base64_length(unsigned int input_length) {
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return (input_length + 2)/3*4;
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}
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unsigned int decode_base64_length(unsigned char input[]) {
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unsigned char *start = input;
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while(base64_to_binary(input[0]) < 64) {
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++input;
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}
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unsigned int input_length = input - start;
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unsigned int output_length = input_length/4*3;
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switch(input_length % 4) {
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default: return output_length;
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case 2: return output_length + 1;
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case 3: return output_length + 2;
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}
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}
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unsigned int encode_base64(unsigned char input[], unsigned int input_length, unsigned char output[]) {
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unsigned int full_sets = input_length/3;
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// While there are still full sets of 24 bits...
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for(unsigned int i = 0; i < full_sets; ++i) {
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output[0] = binary_to_base64( input[0] >> 2);
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output[1] = binary_to_base64((input[0] & 0x03) << 4 | input[1] >> 4);
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output[2] = binary_to_base64((input[1] & 0x0F) << 2 | input[2] >> 6);
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output[3] = binary_to_base64( input[2] & 0x3F);
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input += 3;
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output += 4;
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}
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switch(input_length % 3) {
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case 0:
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output[0] = '\0';
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break;
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case 1:
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output[0] = binary_to_base64( input[0] >> 2);
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output[1] = binary_to_base64((input[0] & 0x03) << 4);
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output[2] = '=';
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output[3] = '=';
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output[4] = '\0';
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break;
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case 2:
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output[0] = binary_to_base64( input[0] >> 2);
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output[1] = binary_to_base64((input[0] & 0x03) << 4 | input[1] >> 4);
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output[2] = binary_to_base64((input[1] & 0x0F) << 2);
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output[3] = '=';
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output[4] = '\0';
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break;
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}
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return encode_base64_length(input_length);
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}
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unsigned int decode_base64(unsigned char input[], unsigned char output[]) {
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unsigned int output_length = decode_base64_length(input);
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// While there are still full sets of 24 bits...
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for(unsigned int i = 2; i < output_length; i += 3) {
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output[0] = base64_to_binary(input[0]) << 2 | base64_to_binary(input[1]) >> 4;
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output[1] = base64_to_binary(input[1]) << 4 | base64_to_binary(input[2]) >> 2;
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output[2] = base64_to_binary(input[2]) << 6 | base64_to_binary(input[3]);
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input += 4;
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output += 3;
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}
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switch(output_length % 3) {
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case 1:
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output[0] = base64_to_binary(input[0]) << 2 | base64_to_binary(input[1]) >> 4;
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break;
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case 2:
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output[0] = base64_to_binary(input[0]) << 2 | base64_to_binary(input[1]) >> 4;
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output[1] = base64_to_binary(input[1]) << 4 | base64_to_binary(input[2]) >> 2;
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break;
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}
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return output_length;
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}
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#endif // ifndef
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