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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>
This commit is contained in:
Junio C Hamano 2006-03-04 02:51:19 -08:00
parent f2fea68a0f
commit f5948cfe67
3 changed files with 2 additions and 84 deletions
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4
Makefile
View File

@ -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 \

72
count-delta.c
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@ -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;
}

10
count-delta.h
View File

@ -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