uuencode: common implementation for wget and uuencode (closing bug 694)

libbb/uuencode.c

@@ -0,0 +1,63 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+/* Conversion table.  for base 64 */
+const char bb_uuenc_tbl_base64[65] = {
+	'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', '+', '/',
+	'=' /* termination character */
+};
+
+const char bb_uuenc_tbl_std[65] = {
+	'`', '!', '"', '#', '$', '%', '&', '\'',
+	'(', ')', '*', '+', ',', '-', '.', '/',
+	'0', '1', '2', '3', '4', '5', '6', '7',
+	'8', '9', ':', ';', '<', '=', '>', '?',
+	'@', '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', '[', '\\', ']', '^', '_',
+	'`' /* termination character */
+};
+
+/*
+ * Encode the string S of length LENGTH to base64 format and place it
+ * to STORE.  STORE will be 0-terminated, and must point to a writable
+ * buffer of at least 1+BASE64_LENGTH(length) bytes.
+ * where BASE64_LENGTH(len) = (4 * ((LENGTH + 2) / 3))
+ */
+void bb_uuencode(const unsigned char *s, char *store, const int length, const char *tbl)
+{
+	int i;
+	char *p = store;
+
+	/* Transform the 3x8 bits to 4x6 bits, as required by base64.  */
+	for (i = 0; i < length; i += 3) {
+		*p++ = tbl[s[0] >> 2];
+		*p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
+		*p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
+		*p++ = tbl[s[2] & 0x3f];
+		s += 3;
+	}
+	/* Pad the result if necessary...  */
+	if (i == length + 1) {
+		*(p - 1) = tbl[64];
+	}
+	else if (i == length + 2) {
+		*(p - 1) = *(p - 2) = tbl[64];
+	}
+	/* ...and zero-terminate it.  */
+	*p = '\0';
+}