Revision 7d09fbe4ab7f080a8f8f5dcef7e0f3edf5e26019 authored by Serge E. Hallyn on 18 April 2006, 13:11:06 UTC, committed by Junio C Hamano on 25 April 2006, 06:07:54 UTC
The set_reuse_addr() error case was the only error case in socklist() where we returned rather than continued. Not sure why. Either we must free the socklist, or continue. This patch continues on error. Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: Junio C Hamano <junkio@cox.net> (cherry picked from 0032d548db56eac9ea09b4ba05843365f6325b85 commit)
1 parent 1ab661d
diff-delta.c
/*
* diff-delta.c: generate a delta between two buffers
*
* Many parts of this file have been lifted from LibXDiff version 0.10.
* http://www.xmailserver.org/xdiff-lib.html
*
* LibXDiff was written by Davide Libenzi <davidel@xmailserver.org>
* Copyright (C) 2003 Davide Libenzi
*
* Many mods for GIT usage by Nicolas Pitre <nico@cam.org>, (C) 2005.
*
* This file is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Use of this within git automatically means that the LGPL
* licensing gets turned into GPLv2 within this project.
*/
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include "delta.h"
/* block size: min = 16, max = 64k, power of 2 */
#define BLK_SIZE 16
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define GR_PRIME 0x9e370001
#define HASH(v, shift) (((unsigned int)(v) * GR_PRIME) >> (shift))
struct index {
const unsigned char *ptr;
unsigned int val;
struct index *next;
};
static struct index ** delta_index(const unsigned char *buf,
unsigned long bufsize,
unsigned long trg_bufsize,
unsigned int *hash_shift)
{
unsigned int i, hsize, hshift, hlimit, entries, *hash_count;
const unsigned char *data;
struct index *entry, **hash;
void *mem;
/* determine index hash size */
entries = bufsize / BLK_SIZE;
hsize = entries / 4;
for (i = 4; (1 << i) < hsize && i < 31; i++);
hsize = 1 << i;
hshift = 32 - i;
*hash_shift = hshift;
/* allocate lookup index */
mem = malloc(hsize * sizeof(*hash) + entries * sizeof(*entry));
if (!mem)
return NULL;
hash = mem;
entry = mem + hsize * sizeof(*hash);
memset(hash, 0, hsize * sizeof(*hash));
/* allocate an array to count hash entries */
hash_count = calloc(hsize, sizeof(*hash_count));
if (!hash_count) {
free(hash);
return NULL;
}
/* then populate the index */
data = buf + entries * BLK_SIZE - BLK_SIZE;
while (data >= buf) {
unsigned int val = adler32(0, data, BLK_SIZE);
i = HASH(val, hshift);
entry->ptr = data;
entry->val = val;
entry->next = hash[i];
hash[i] = entry++;
hash_count[i]++;
data -= BLK_SIZE;
}
/*
* Determine a limit on the number of entries in the same hash
* bucket. This guard us against patological data sets causing
* really bad hash distribution with most entries in the same hash
* bucket that would bring us to O(m*n) computing costs (m and n
* corresponding to reference and target buffer sizes).
*
* The more the target buffer is large, the more it is important to
* have small entry lists for each hash buckets. With such a limit
* the cost is bounded to something more like O(m+n).
*/
hlimit = (1 << 26) / trg_bufsize;
if (hlimit < 4*BLK_SIZE)
hlimit = 4*BLK_SIZE;
/*
* Now make sure none of the hash buckets has more entries than
* we're willing to test. Otherwise we cull the entry list
* uniformly to still preserve a good repartition across
* the reference buffer.
*/
for (i = 0; i < hsize; i++) {
if (hash_count[i] < hlimit)
continue;
entry = hash[i];
do {
struct index *keep = entry;
int skip = hash_count[i] / hlimit / 2;
do {
entry = entry->next;
} while(--skip && entry);
keep->next = entry;
} while(entry);
}
free(hash_count);
return hash;
}
/* provide the size of the copy opcode given the block offset and size */
#define COPYOP_SIZE(o, s) \
(!!(o & 0xff) + !!(o & 0xff00) + !!(o & 0xff0000) + !!(o & 0xff000000) + \
!!(s & 0xff) + !!(s & 0xff00) + 1)
/* the maximum size for any opcode */
#define MAX_OP_SIZE COPYOP_SIZE(0xffffffff, 0xffffffff)
void *diff_delta(void *from_buf, unsigned long from_size,
void *to_buf, unsigned long to_size,
unsigned long *delta_size,
unsigned long max_size)
{
unsigned int i, outpos, outsize, hash_shift;
int inscnt;
const unsigned char *ref_data, *ref_top, *data, *top;
unsigned char *out;
struct index *entry, **hash;
if (!from_size || !to_size)
return NULL;
hash = delta_index(from_buf, from_size, to_size, &hash_shift);
if (!hash)
return NULL;
outpos = 0;
outsize = 8192;
if (max_size && outsize >= max_size)
outsize = max_size + MAX_OP_SIZE + 1;
out = malloc(outsize);
if (!out) {
free(hash);
return NULL;
}
ref_data = from_buf;
ref_top = from_buf + from_size;
data = to_buf;
top = to_buf + to_size;
/* store reference buffer size */
out[outpos++] = from_size;
from_size >>= 7;
while (from_size) {
out[outpos - 1] |= 0x80;
out[outpos++] = from_size;
from_size >>= 7;
}
/* store target buffer size */
out[outpos++] = to_size;
to_size >>= 7;
while (to_size) {
out[outpos - 1] |= 0x80;
out[outpos++] = to_size;
to_size >>= 7;
}
inscnt = 0;
while (data < top) {
unsigned int moff = 0, msize = 0;
if (data + BLK_SIZE <= top) {
unsigned int val = adler32(0, data, BLK_SIZE);
i = HASH(val, hash_shift);
for (entry = hash[i]; entry; entry = entry->next) {
const unsigned char *ref = entry->ptr;
const unsigned char *src = data;
unsigned int ref_size = ref_top - ref;
if (entry->val != val)
continue;
if (ref_size > top - src)
ref_size = top - src;
if (ref_size > 0x10000)
ref_size = 0x10000;
if (ref_size <= msize)
break;
while (ref_size-- && *src++ == *ref)
ref++;
if (msize < ref - entry->ptr) {
/* this is our best match so far */
msize = ref - entry->ptr;
moff = entry->ptr - ref_data;
}
}
}
if (!msize || msize < COPYOP_SIZE(moff, msize)) {
if (!inscnt)
outpos++;
out[outpos++] = *data++;
inscnt++;
if (inscnt == 0x7f) {
out[outpos - inscnt - 1] = inscnt;
inscnt = 0;
}
} else {
unsigned char *op;
if (inscnt) {
while (moff && ref_data[moff-1] == data[-1]) {
if (msize == 0x10000)
break;
/* we can match one byte back */
msize++;
moff--;
data--;
outpos--;
if (--inscnt)
continue;
outpos--; /* remove count slot */
inscnt--; /* make it -1 */
break;
}
out[outpos - inscnt - 1] = inscnt;
inscnt = 0;
}
data += msize;
op = out + outpos++;
i = 0x80;
if (moff & 0xff) { out[outpos++] = moff; i |= 0x01; }
moff >>= 8;
if (moff & 0xff) { out[outpos++] = moff; i |= 0x02; }
moff >>= 8;
if (moff & 0xff) { out[outpos++] = moff; i |= 0x04; }
moff >>= 8;
if (moff & 0xff) { out[outpos++] = moff; i |= 0x08; }
if (msize & 0xff) { out[outpos++] = msize; i |= 0x10; }
msize >>= 8;
if (msize & 0xff) { out[outpos++] = msize; i |= 0x20; }
*op = i;
}
if (outpos >= outsize - MAX_OP_SIZE) {
void *tmp = out;
outsize = outsize * 3 / 2;
if (max_size && outsize >= max_size)
outsize = max_size + MAX_OP_SIZE + 1;
if (max_size && outpos > max_size)
out = NULL;
else
out = realloc(out, outsize);
if (!out) {
free(tmp);
free(hash);
return NULL;
}
}
}
if (inscnt)
out[outpos - inscnt - 1] = inscnt;
free(hash);
*delta_size = outpos;
return out;
}
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