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-rw-r--r--toys/other/base64.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/toys/other/base64.c b/toys/other/base64.c
new file mode 100644
index 00000000..7dc61147
--- /dev/null
+++ b/toys/other/base64.c
@@ -0,0 +1,87 @@
+/* base64.c - Encode and decode base64
+ *
+ * Copyright 2014 Rob Landley <rob@landley.net>
+ *
+ * No standard
+
+USE_BASE64(NEWTOY(base64, "diw#<1[!dw]", TOYFLAG_USR|TOYFLAG_BIN))
+
+config BASE64
+ bool "base64"
+ default y
+ help
+ usage: base64 [-di] [-w COLUMNS] [FILE...]
+
+ Encode or decode in base64.
+
+ -d decode
+ -i ignore non-alphabetic characters
+ -w wrap output at COLUMNS (default 76)
+*/
+
+#define FOR_base64
+#include "toys.h"
+
+GLOBALS(
+ long columns;
+)
+
+static void do_base64(int fd, char *name)
+{
+ int out = 0, bits = 0, x = 0, i, len;
+ char *buf = toybuf+128;
+
+ for (;;) {
+ if (!(len = xread(fd, buf, sizeof(toybuf)-128))) {
+ if (!(toys.optflags & FLAG_d)) {
+ if (bits) {
+ putchar(toybuf[out<<(6-bits)]);
+ x++;
+ }
+ while (x++&3) putchar('=');
+ if (x != 1) xputc('\n');
+ }
+
+ return;
+ }
+ for (i=0; i<len; i++) {
+ if (toys.optflags & FLAG_d) {
+ if (buf[i] == '=') return;
+
+ if ((x = stridx(toybuf, buf[i])) != -1) {
+ out = (out<<6) + x;
+ bits += 6;
+ if (bits >= 8) {
+ putchar(out >> (bits -= 8));
+ out &= (1<<bits)-1;
+ if (ferror(stdout)) perror_exit(0);
+ }
+
+ continue;
+ }
+ if (buf[i] == '\n' || (toys.optflags & FLAG_i)) continue;
+
+ break;
+ } else {
+ out = (out<<8) + buf[i];
+ bits += 8;
+ while (bits >= 6) {
+ putchar(toybuf[out >> (bits -= 6)]);
+ out &= (1<<bits)-1;
+ if (TT.columns == ++x) {
+ xputc('\n');
+ x = 0;
+ }
+ }
+ }
+ }
+ }
+}
+
+void base64_main(void)
+{
+ if (!TT.columns) TT.columns = 76;
+
+ base64_init(toybuf);
+ loopfiles(toys.optargs, do_base64);
+}