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/**
*
* Copyright 2005, 2006 Nick Galbreath -- nickg [at] modp [dot] com
* Copyright 2017 Matthieu Darbois
* All rights reserved.
*
* http://modp.com/release/base64
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/****************************/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
static uint8_t b64chars[64] = {
'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', '+', '/'
};
static uint8_t padchar = '=';
static void printStart(void)
{
printf("#include <stdint.h>\n");
printf("#define CHAR62 '%c'\n", b64chars[62]);
printf("#define CHAR63 '%c'\n", b64chars[63]);
printf("#define CHARPAD '%c'\n", padchar);
}
static void clearDecodeTable(uint32_t* ary)
{
int i = 0;
for (i = 0; i < 256; ++i) {
ary[i] = 0xFFFFFFFF;
}
}
/* dump uint32_t as hex digits */
void uint32_array_to_c_hex(const uint32_t* ary, size_t sz, const char* name)
{
size_t i = 0;
printf("const uint32_t %s[%d] = {\n", name, (int)sz);
for (;;) {
printf("0x%08" PRIx32, ary[i]);
++i;
if (i == sz)
break;
if (i % 6 == 0) {
printf(",\n");
} else {
printf(", ");
}
}
printf("\n};\n");
}
int main(int argc, char** argv)
{
uint32_t x;
uint32_t i = 0;
uint32_t ary[256];
/* over-ride standard alphabet */
if (argc == 2) {
uint8_t* replacements = (uint8_t*)argv[1];
if (strlen((char*)replacements) != 3) {
fprintf(stderr, "input must be a string of 3 characters '-', '.' or '_'\n");
exit(1);
}
fprintf(stderr, "fusing '%s' as replacements in base64 encoding\n", replacements);
b64chars[62] = replacements[0];
b64chars[63] = replacements[1];
padchar = replacements[2];
}
printStart();
printf("\n\n#if BASE64_LITTLE_ENDIAN\n");
printf("\n\n/* SPECIAL DECODE TABLES FOR LITTLE ENDIAN (INTEL) CPUS */\n\n");
clearDecodeTable(ary);
for (i = 0; i < 64; ++i) {
x = b64chars[i];
ary[x] = i << 2;
}
uint32_array_to_c_hex(ary, sizeof(ary) / sizeof(uint32_t), "base64_table_dec_32bit_d0");
printf("\n\n");
clearDecodeTable(ary);
for (i = 0; i < 64; ++i) {
x = b64chars[i];
ary[x] = ((i & 0x30) >> 4) | ((i & 0x0F) << 12);
}
uint32_array_to_c_hex(ary, sizeof(ary) / sizeof(uint32_t), "base64_table_dec_32bit_d1");
printf("\n\n");
clearDecodeTable(ary);
for (i = 0; i < 64; ++i) {
x = b64chars[i];
ary[x] = ((i & 0x03) << 22) | ((i & 0x3c) << 6);
}
uint32_array_to_c_hex(ary, sizeof(ary) / sizeof(uint32_t), "base64_table_dec_32bit_d2");
printf("\n\n");
clearDecodeTable(ary);
for (i = 0; i < 64; ++i) {
x = b64chars[i];
ary[x] = i << 16;
}
uint32_array_to_c_hex(ary, sizeof(ary) / sizeof(uint32_t), "base64_table_dec_32bit_d3");
printf("\n\n");
printf("#else\n");
printf("\n\n/* SPECIAL DECODE TABLES FOR BIG ENDIAN (IBM/MOTOROLA/SUN) CPUS */\n\n");
clearDecodeTable(ary);
for (i = 0; i < 64; ++i) {
x = b64chars[i];
ary[x] = i << 26;
}
uint32_array_to_c_hex(ary, sizeof(ary) / sizeof(uint32_t), "base64_table_dec_32bit_d0");
printf("\n\n");
clearDecodeTable(ary);
for (i = 0; i < 64; ++i) {
x = b64chars[i];
ary[x] = i << 20;
}
uint32_array_to_c_hex(ary, sizeof(ary) / sizeof(uint32_t), "base64_table_dec_32bit_d1");
printf("\n\n");
clearDecodeTable(ary);
for (i = 0; i < 64; ++i) {
x = b64chars[i];
ary[x] = i << 14;
}
uint32_array_to_c_hex(ary, sizeof(ary) / sizeof(uint32_t), "base64_table_dec_32bit_d2");
printf("\n\n");
clearDecodeTable(ary);
for (i = 0; i < 64; ++i) {
x = b64chars[i];
ary[x] = i << 8;
}
uint32_array_to_c_hex(ary, sizeof(ary) / sizeof(uint32_t), "base64_table_dec_32bit_d3");
printf("\n\n");
printf("#endif\n");
return 0;
}
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