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authorRob Landley <rob@landley.net>2007-01-20 12:30:19 -0500
committerRob Landley <rob@landley.net>2007-01-20 12:30:19 -0500
commit125a2c74f2ef9438b09930b208dd88bf7538bac8 (patch)
treed1a15791bdc4b58666be51ce0ac6698d00cdd412
parent94515a2803d8db4b5a0c1cc51554f79a98803891 (diff)
downloadtoybox-125a2c74f2ef9438b09930b208dd88bf7538bac8.tar.gz
Merge a memset with an existing loop, tweak comments.
-rw-r--r--lib/bunzip.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/lib/bunzip.c b/lib/bunzip.c
index 139848e7..049dc02e 100644
--- a/lib/bunzip.c
+++ b/lib/bunzip.c
@@ -264,8 +264,10 @@ int read_bunzip_data(bunzip_data *bd)
// and run length encoding, saving the result into dbuf[dbufCount++] = uc
// Initialize symbol occurrence counters and symbol mtf table
- memset(byteCount, 0, 256*sizeof(int));
- for(i=0; i<256; i++) mtfSymbol[i] = (unsigned char)i;
+ for(i=0; i<256; i++) {
+ byteCount[i] = 0;
+ mtfSymbol[i] = i;
+ }
// Loop through compressed symbols. This is the first "tight inner loop"
// that needs to be micro-optimized for speed. (This one fills out dbuf[]
@@ -360,10 +362,13 @@ int read_bunzip_data(bunzip_data *bd)
dbuf[dbufCount++] = (unsigned int)uc;
}
- /* At this point, we've finished reading huffman-coded symbols and
- compressed runs from the input stream. There are dbufCount many of
- them in dbuf[]. Now undo the Burrows-Wheeler transform on dbuf.
- See http://marknelson.us/1996/09/01/bwt/
+ /* At this point, we've finished reading all of this block's huffman-coded
+ * symbols (and repeated runs) from the input stream, and have written
+ * dbufCount many of them into dbuf[], the intermediate buffer.
+ *
+ * Now undo the Burrows-Wheeler transform on dbuf, described here:
+ * http://dogma.net/markn/articles/bwt/bwt.htm
+ * http://marknelson.us/1996/09/01/bwt/
*/
// Now we know what dbufCount is, do a better sanity check on origPtr.