mirror of
https://github.com/git/git.git
synced 2024-12-18 06:14:59 +08:00
26675087a5
We don't call this function, and never have. The on-disk bitmap format uses network-byte-order integers, meaning that we cannot use the native-byte-order format written here. Let's drop it in the name of simplicity. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/**
|
|
* Copyright 2013, GitHub, Inc
|
|
* Copyright 2009-2013, Daniel Lemire, Cliff Moon,
|
|
* David McIntosh, Robert Becho, Google Inc. and Veronika Zenz
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include "git-compat-util.h"
|
|
#include "ewok.h"
|
|
#include "strbuf.h"
|
|
|
|
int ewah_serialize_to(struct ewah_bitmap *self,
|
|
int (*write_fun)(void *, const void *, size_t),
|
|
void *data)
|
|
{
|
|
size_t i;
|
|
eword_t dump[2048];
|
|
const size_t words_per_dump = sizeof(dump) / sizeof(eword_t);
|
|
uint32_t bitsize, word_count, rlw_pos;
|
|
|
|
const eword_t *buffer;
|
|
size_t words_left;
|
|
|
|
/* 32 bit -- bit size for the map */
|
|
bitsize = htonl((uint32_t)self->bit_size);
|
|
if (write_fun(data, &bitsize, 4) != 4)
|
|
return -1;
|
|
|
|
/** 32 bit -- number of compressed 64-bit words */
|
|
word_count = htonl((uint32_t)self->buffer_size);
|
|
if (write_fun(data, &word_count, 4) != 4)
|
|
return -1;
|
|
|
|
/** 64 bit x N -- compressed words */
|
|
buffer = self->buffer;
|
|
words_left = self->buffer_size;
|
|
|
|
while (words_left >= words_per_dump) {
|
|
for (i = 0; i < words_per_dump; ++i, ++buffer)
|
|
dump[i] = htonll(*buffer);
|
|
|
|
if (write_fun(data, dump, sizeof(dump)) != sizeof(dump))
|
|
return -1;
|
|
|
|
words_left -= words_per_dump;
|
|
}
|
|
|
|
if (words_left) {
|
|
for (i = 0; i < words_left; ++i, ++buffer)
|
|
dump[i] = htonll(*buffer);
|
|
|
|
if (write_fun(data, dump, words_left * 8) != words_left * 8)
|
|
return -1;
|
|
}
|
|
|
|
/** 32 bit -- position for the RLW */
|
|
rlw_pos = (uint8_t*)self->rlw - (uint8_t *)self->buffer;
|
|
rlw_pos = htonl(rlw_pos / sizeof(eword_t));
|
|
|
|
if (write_fun(data, &rlw_pos, 4) != 4)
|
|
return -1;
|
|
|
|
return (3 * 4) + (self->buffer_size * 8);
|
|
}
|
|
|
|
static int write_strbuf(void *user_data, const void *data, size_t len)
|
|
{
|
|
struct strbuf *sb = user_data;
|
|
strbuf_add(sb, data, len);
|
|
return len;
|
|
}
|
|
|
|
int ewah_serialize_strbuf(struct ewah_bitmap *self, struct strbuf *sb)
|
|
{
|
|
return ewah_serialize_to(self, write_strbuf, sb);
|
|
}
|
|
|
|
ssize_t ewah_read_mmap(struct ewah_bitmap *self, const void *map, size_t len)
|
|
{
|
|
const uint8_t *ptr = map;
|
|
size_t data_len;
|
|
size_t i;
|
|
|
|
if (len < sizeof(uint32_t))
|
|
return error("corrupt ewah bitmap: eof before bit size");
|
|
self->bit_size = get_be32(ptr);
|
|
ptr += sizeof(uint32_t);
|
|
len -= sizeof(uint32_t);
|
|
|
|
if (len < sizeof(uint32_t))
|
|
return error("corrupt ewah bitmap: eof before length");
|
|
self->buffer_size = self->alloc_size = get_be32(ptr);
|
|
ptr += sizeof(uint32_t);
|
|
len -= sizeof(uint32_t);
|
|
|
|
REALLOC_ARRAY(self->buffer, self->alloc_size);
|
|
|
|
/*
|
|
* Copy the raw data for the bitmap as a whole chunk;
|
|
* if we're in a little-endian platform, we'll perform
|
|
* the endianness conversion in a separate pass to ensure
|
|
* we're loading 8-byte aligned words.
|
|
*/
|
|
data_len = st_mult(self->buffer_size, sizeof(eword_t));
|
|
if (len < data_len)
|
|
return error("corrupt ewah bitmap: eof in data "
|
|
"(%"PRIuMAX" bytes short)",
|
|
(uintmax_t)(data_len - len));
|
|
memcpy(self->buffer, ptr, data_len);
|
|
ptr += data_len;
|
|
len -= data_len;
|
|
|
|
for (i = 0; i < self->buffer_size; ++i)
|
|
self->buffer[i] = ntohll(self->buffer[i]);
|
|
|
|
if (len < sizeof(uint32_t))
|
|
return error("corrupt ewah bitmap: eof before rlw");
|
|
self->rlw = self->buffer + get_be32(ptr);
|
|
ptr += sizeof(uint32_t);
|
|
len -= sizeof(uint32_t);
|
|
|
|
return ptr - (const uint8_t *)map;
|
|
}
|