1 /* base64.c - Encode and decode base64 2 * 3 * Copyright 2014 Rob Landley <rob (at) landley.net> 4 * 5 * No standard 6 7 USE_BASE64(NEWTOY(base64, "diw#<1[!dw]", TOYFLAG_USR|TOYFLAG_BIN)) 8 9 config BASE64 10 bool "base64" 11 default y 12 help 13 usage: base64 [-di] [-w COLUMNS] [FILE...] 14 15 Encode or decode in base64. 16 17 -d decode 18 -i ignore non-alphabetic characters 19 -w wrap output at COLUMNS (default 76) 20 */ 21 22 #define FOR_base64 23 #include "toys.h" 24 25 GLOBALS( 26 long columns; 27 ) 28 29 static void do_base64(int fd, char *name) 30 { 31 int out = 0, bits = 0, x = 0, i, len; 32 char *buf = toybuf+128; 33 34 for (;;) { 35 if (!(len = xread(fd, buf, sizeof(toybuf)-128))) { 36 if (!(toys.optflags & FLAG_d)) { 37 if (bits) { 38 putchar(toybuf[out<<(6-bits)]); 39 x++; 40 } 41 while (x++&3) putchar('='); 42 if (x != 1) xputc('\n'); 43 } 44 45 return; 46 } 47 for (i=0; i<len; i++) { 48 if (toys.optflags & FLAG_d) { 49 if (buf[i] == '=') return; 50 51 if ((x = stridx(toybuf, buf[i])) != -1) { 52 out = (out<<6) + x; 53 bits += 6; 54 if (bits >= 8) { 55 putchar(out >> (bits -= 8)); 56 out &= (1<<bits)-1; 57 if (ferror(stdout)) perror_exit(0); 58 } 59 60 continue; 61 } 62 if (buf[i] == '\n' || (toys.optflags & FLAG_i)) continue; 63 64 break; 65 } else { 66 out = (out<<8) + buf[i]; 67 bits += 8; 68 while (bits >= 6) { 69 putchar(toybuf[out >> (bits -= 6)]); 70 out &= (1<<bits)-1; 71 if (TT.columns == ++x) { 72 xputc('\n'); 73 x = 0; 74 } 75 } 76 } 77 } 78 } 79 } 80 81 void base64_main(void) 82 { 83 if (!TT.columns) TT.columns = 76; 84 85 base64_init(toybuf); 86 loopfiles(toys.optargs, do_base64); 87 } 88
