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abandoned idea: base80 asciilification #2

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123 changes: 123 additions & 0 deletions base80.c
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Original file line number Diff line number Diff line change
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#include <openssl/bn.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>


uint8_t base80_symbols[80] =
"!$&()*+,-./0123456789:=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz|~";

#define INVALID_SYMBOL 255

uint8_t symbols_base80[256] = {
[0 ... 255] = INVALID_SYMBOL,
['!'] = 0, ['$'] = 1, ['&'] = 2, ['('] = 3, [')'] = 4, ['*'] = 5, ['+'] = 6, [','] = 7,
['-'] = 8, ['.'] = 9, ['/'] = 10, ['0'] = 11, ['1'] = 12, ['2'] = 13, ['3'] = 14, ['4'] = 15,
['5'] = 16, ['6'] = 17, ['7'] = 18, ['8'] = 19, ['9'] = 20, [':'] = 21, ['='] = 22, ['?'] = 23,
['@'] = 24, ['A'] = 25, ['B'] = 26, ['C'] = 27, ['D'] = 28, ['E'] = 29, ['F'] = 30, ['G'] = 31,
['H'] = 32, ['I'] = 33, ['J'] = 34, ['K'] = 35, ['L'] = 36, ['M'] = 37, ['N'] = 38, ['O'] = 39,
['P'] = 40, ['Q'] = 41, ['R'] = 42, ['S'] = 43, ['T'] = 44, ['U'] = 45, ['V'] = 46, ['W'] = 47,
['X'] = 48, ['Y'] = 49, ['Z'] = 50, ['_'] = 51, ['a'] = 52, ['b'] = 53, ['c'] = 54, ['d'] = 55,
['e'] = 56, ['f'] = 57, ['g'] = 58, ['h'] = 59, ['i'] = 60, ['j'] = 61, ['k'] = 62, ['l'] = 63,
['m'] = 64, ['n'] = 65, ['o'] = 66, ['p'] = 67, ['q'] = 68, ['r'] = 69, ['s'] = 70, ['t'] = 71,
['u'] = 72, ['v'] = 73, ['w'] = 74, ['x'] = 75, ['y'] = 76, ['z'] = 77, ['|'] = 78, ['~'] = 79,
};

int main2(void);

int
main(void)
{
int ret;
BN_CTX *ctx = BN_CTX_new();
BIGNUM *num = BN_new();
const BIGNUM *zero = BN_new();
BIGNUM *remainder = BN_new();
BIGNUM *div80 = BN_new();
BIGNUM *quot = BN_new();
BIGNUM *temp;

BN_set_word(div80, 80);

//char c[] = "The BN library performs arithmet";
char c[] = "performs arithmet";
char buf[32] = {0};

memcpy(buf + 32 - (sizeof (c)) - 1, c, (sizeof (c)) - 1);


BN_bin2bn(buf, (sizeof (buf)), num);

char *dec = BN_bn2dec(num);
printf("%s\n", dec);
free(dec);

int index = 0;
char out[42] = {0};

while (BN_cmp(num, zero) == 1) {
//int BN_div(BIGNUM *dv, BIGNUM *rem, const BIGNUM *a, const BIGNUM *d, BN_CTX *ctx);
assert(BN_div(quot, remainder, num, div80, ctx));
BN_ULONG w = BN_get_word(remainder);

char *dec = BN_bn2dec(quot);
printf("%s %ld\n", dec, w);
free(dec);

assert(80 > w);
out[index] = base80_symbols[w];
index++;

temp = quot;
quot = num;
num = temp;
}

printf("%s\n", out);

BN_clear_free(num);
BN_free((BIGNUM*)zero);
BN_clear_free(div80);
BN_clear_free(remainder);
BN_CTX_free(ctx);

main2();

return 0;

}

int
main2(void)
{
//char buf[] = "qtt|Mlp&ruG@(BWyr:u+eWssG,$YxIsVHp)r1Gkr&";
char buf[] = "U9ZegR,E*B2m@VoRcGH";
uint8_t w;

char out[33] = {0};

BIGNUM *num = BN_new();
BIGNUM *mul80 = BN_new();
BN_CTX *ctx = BN_CTX_new();

BN_set_word(mul80, 80);

int index = (sizeof (buf)) - 1;

while (index > 0) {
w = symbols_base80[buf[--index]];
assert(w != INVALID_SYMBOL);
BN_mul(num, num, mul80, ctx);
BN_add_word(num, w);
char *dec = BN_bn2dec(num);
printf("%s %d\n", dec, w);
free(dec);
}

printf("%d\n", BN_num_bytes(num));
assert((sizeof (out)) - 1 >= BN_num_bytes(num));
BN_bn2bin(num, out);
printf("%s\n", out);

return 0;
}