pack.c (encodes): name a magic number

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47064 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 6 deletions

diff --git a/pack.c b/pack.c
index 80ffef5930..74637adca4 100644
--- a/pack.c
+++ b/pack.c
@@ -945,10 +945,10 @@ static const char b64_table[] =
 static void
 encodes(VALUE str, const char *s, long len, int type, int tail_lf)
 {
-    enum {buff_size = 4096, encoded_unit = 4};
+    enum {buff_size = 4096, encoded_unit = 4, input_unit = 3};
     char buff[buff_size + 1];	/* +1 for tail_lf */
     long i = 0;
-    const char *trans = type == 'u' ? uu_table : b64_table;
+    const char *const trans = type == 'u' ? uu_table : b64_table;
     char padding;
 
     if (type == 'u') {
@@ -958,14 +958,14 @@ encodes(VALUE str, const char *s, long len, int type, int tail_lf)
     else {
 	padding = '=';
     }
-    while (len >= 3) {
-        while (len >= 3 && buff_size-i >= encoded_unit) {
+    while (len >= input_unit) {
+        while (len >= input_unit && buff_size-i >= encoded_unit) {
             buff[i++] = trans[077 & (*s >> 2)];
             buff[i++] = trans[077 & (((*s << 4) & 060) | ((s[1] >> 4) & 017))];
             buff[i++] = trans[077 & (((s[1] << 2) & 074) | ((s[2] >> 6) & 03))];
             buff[i++] = trans[077 & s[2]];
-            s += 3;
-            len -= 3;
+            s += input_unit;
+            len -= input_unit;
         }
         if (buff_size-i < encoded_unit) {
             rb_str_buf_cat(str, buff, i);