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

2 files changed, 65 insertions, 0 deletions

diff --git a/libbb/Makefile.in b/libbb/Makefile.in
index f94c100a9..0f2328072 100644
--- a/libbb/Makefile.in
+++ b/libbb/Makefile.in
@@ -48,6 +48,8 @@ LIBBB-$(CONFIG_SU)+= correct_password.c
 LIBBB-$(CONFIG_LOGIN)+= correct_password.c
 LIBBB-$(CONFIG_DF)+= find_mount_point.c
 LIBBB-$(CONFIG_EJECT)+= find_mount_point.c
+LIBBB-$(CONFIG_UUENCODE)+= uuencode.c
+LIBBB-$(CONFIG_WGET)+= uuencode.c
 
 # We shouldn't build xregcomp.c if we don't need it - this ensures we don't
 # require regex.h to be in the include dir even if we don't need it thereby
diff --git a/libbb/uuencode.c b/libbb/uuencode.c
new file mode 100644
index 000000000..38401205b
--- /dev/null
+++ b/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';
+}