count-delta: no need for this anymore.

This is a companion patch to e29e1147e4
which made diffcore similarity estimator independent from the packfile
deltifier.  There is no reason for us to be counting the xdelta anymore.

Signed-off-by: Junio C Hamano <junkio@cox.net>

Makefile

@@ -190,7 +190,7 @@ PYMODULES = \
 LIB_FILE=libgit.a
 
 LIB_H = \
-	blob.h cache.h commit.h count-delta.h csum-file.h delta.h \
+	blob.h cache.h commit.h csum-file.h delta.h \
 	diff.h object.h pack.h pkt-line.h quote.h refs.h \
 	run-command.h strbuf.h tag.h tree.h git-compat-util.h revision.h
 
@@ -200,7 +200,7 @@ DIFF_OBJS = \
 	diffcore-delta.o
 
 LIB_OBJS = \
-	blob.o commit.o connect.o count-delta.o csum-file.o \
+	blob.o commit.o connect.o csum-file.o \
 	date.o diff-delta.o entry.o exec_cmd.o ident.o index.o \
 	object.o pack-check.o patch-delta.o path.o pkt-line.o \
 	quote.o read-cache.o refs.o run-command.o \

count-delta.c

@@ -1,72 +0,0 @@
-/*
- * Copyright (C) 2005 Junio C Hamano
- * The delta-parsing part is almost straight copy of patch-delta.c
- * which is (C) 2005 Nicolas Pitre <nico@cam.org>.
- */
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-#include "delta.h"
-#include "count-delta.h"
-
-/*
- * NOTE.  We do not _interpret_ delta fully.  As an approximation, we
- * just count the number of bytes that are copied from the source, and
- * the number of literal data bytes that are inserted.
- *
- * Number of bytes that are _not_ copied from the source is deletion,
- * and number of inserted literal bytes are addition, so sum of them
- * is the extent of damage.
- */
-int count_delta(void *delta_buf, unsigned long delta_size,
-		unsigned long *src_copied, unsigned long *literal_added)
-{
-	unsigned long copied_from_source, added_literal;
-	const unsigned char *data, *top;
-	unsigned char cmd;
-	unsigned long src_size, dst_size, out;
-
-	if (delta_size < DELTA_SIZE_MIN)
-		return -1;
-
-	data = delta_buf;
-	top = delta_buf + delta_size;
-
-	src_size = get_delta_hdr_size(&data);
-	dst_size = get_delta_hdr_size(&data);
-
-	added_literal = copied_from_source = out = 0;
-	while (data < top) {
-		cmd = *data++;
-		if (cmd & 0x80) {
-			unsigned long cp_off = 0, cp_size = 0;
-			if (cmd & 0x01) cp_off = *data++;
-			if (cmd & 0x02) cp_off |= (*data++ << 8);
-			if (cmd & 0x04) cp_off |= (*data++ << 16);
-			if (cmd & 0x08) cp_off |= (*data++ << 24);
-			if (cmd & 0x10) cp_size = *data++;
-			if (cmd & 0x20) cp_size |= (*data++ << 8);
-			if (cmd & 0x40) cp_size |= (*data++ << 16);
-			if (cp_size == 0) cp_size = 0x10000;
-
-			copied_from_source += cp_size;
-			out += cp_size;
-		} else {
-			/* write literal into dst */
-			added_literal += cmd;
-			out += cmd;
-			data += cmd;
-		}
-	}
-
-	/* sanity check */
-	if (data != top || out != dst_size)
-		return -1;
-
-	/* delete size is what was _not_ copied from source.
-	 * edit size is that and literal additions.
-	 */
-	*src_copied = copied_from_source;
-	*literal_added = added_literal;
-	return 0;
-}

count-delta.h

@@ -1,10 +0,0 @@
-/*
- * Copyright (C) 2005 Junio C Hamano
- */
-#ifndef COUNT_DELTA_H
-#define COUNT_DELTA_H
-
-int count_delta(void *, unsigned long,
-		unsigned long *src_copied, unsigned long *literal_added);
-
-#endif