94 lines
1.8 KiB
C
94 lines
1.8 KiB
C
/* base64.c - Encode and decode base64
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*
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* Copyright 2014 Rob Landley <rob@landley.net>
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*
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* No standard
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USE_BASE64(NEWTOY(base64, "diw#<0=76[!dw]", TOYFLAG_USR|TOYFLAG_BIN))
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config BASE64
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bool "base64"
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default y
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help
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usage: base64 [-di] [-w COLUMNS] [FILE...]
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Encode or decode in base64.
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-d decode
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-i ignore non-alphabetic characters
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-w wrap output at COLUMNS (default 76 or 0 for no wrap)
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*/
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#define FOR_base64
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#include "toys.h"
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GLOBALS(
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long columns;
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unsigned total;
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)
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static void wraputchar(int c, int *x)
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{
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putchar(c);
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TT.total++;
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if (TT.columns && ++*x == TT.columns) {
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*x = 0;
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xputc('\n');
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};
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}
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static void do_base64(int fd, char *name)
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{
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int out = 0, bits = 0, x = 0, i, len;
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char *buf = toybuf+128;
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TT.total = 0;
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for (;;) {
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// If no more data, flush buffer
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if (!(len = xread(fd, buf, sizeof(toybuf)-128))) {
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if (!(toys.optflags & FLAG_d)) {
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if (bits) wraputchar(toybuf[out<<(6-bits)], &x);
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while (TT.total&3) wraputchar('=', &x);
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if (x) xputc('\n');
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}
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return;
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}
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for (i=0; i<len; i++) {
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if (toys.optflags & FLAG_d) {
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if (buf[i] == '=') return;
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if ((x = stridx(toybuf, buf[i])) != -1) {
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out = (out<<6) + x;
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bits += 6;
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if (bits >= 8) {
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putchar(out >> (bits -= 8));
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out &= (1<<bits)-1;
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if (ferror(stdout)) perror_exit(0);
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}
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continue;
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}
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if (buf[i] == '\n' || (toys.optflags & FLAG_i)) continue;
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break;
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} else {
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out = (out<<8) + buf[i];
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bits += 8;
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while (bits >= 6) {
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wraputchar(toybuf[out >> (bits -= 6)], &x);
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out &= (1<<bits)-1;
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}
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}
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}
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}
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}
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void base64_main(void)
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{
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base64_init(toybuf);
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loopfiles(toys.optargs, do_base64);
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}
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