mirror of
https://github.com/git/git.git
synced 2024-11-16 22:14:53 +01:00
4c81b03e30
This means that we can depend on packs always being stable on disk, simplifying a lot of the object serialization worries. And unlike loose objects, serializing pack creation IO isn't going to be a performance killer. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/*
|
|
* csum-file.c
|
|
*
|
|
* Copyright (C) 2005 Linus Torvalds
|
|
*
|
|
* Simple file write infrastructure for writing SHA1-summed
|
|
* files. Useful when you write a file that you want to be
|
|
* able to verify hasn't been messed with afterwards.
|
|
*/
|
|
#include "cache.h"
|
|
#include "progress.h"
|
|
#include "csum-file.h"
|
|
|
|
static void sha1flush(struct sha1file *f, unsigned int count)
|
|
{
|
|
void *buf = f->buffer;
|
|
|
|
for (;;) {
|
|
int ret = xwrite(f->fd, buf, count);
|
|
if (ret > 0) {
|
|
f->total += ret;
|
|
display_throughput(f->tp, f->total);
|
|
buf = (char *) buf + ret;
|
|
count -= ret;
|
|
if (count)
|
|
continue;
|
|
return;
|
|
}
|
|
if (!ret)
|
|
die("sha1 file '%s' write error. Out of diskspace", f->name);
|
|
die("sha1 file '%s' write error (%s)", f->name, strerror(errno));
|
|
}
|
|
}
|
|
|
|
int sha1close(struct sha1file *f, unsigned char *result, unsigned int flags)
|
|
{
|
|
int fd;
|
|
unsigned offset = f->offset;
|
|
|
|
if (offset) {
|
|
SHA1_Update(&f->ctx, f->buffer, offset);
|
|
sha1flush(f, offset);
|
|
f->offset = 0;
|
|
}
|
|
if (flags & (CSUM_CLOSE | CSUM_FSYNC)) {
|
|
/* write checksum and close fd */
|
|
SHA1_Final(f->buffer, &f->ctx);
|
|
if (result)
|
|
hashcpy(result, f->buffer);
|
|
sha1flush(f, 20);
|
|
if (flags & CSUM_FSYNC)
|
|
fsync_or_die(f->fd, f->name);
|
|
if (close(f->fd))
|
|
die("%s: sha1 file error on close (%s)",
|
|
f->name, strerror(errno));
|
|
fd = 0;
|
|
} else
|
|
fd = f->fd;
|
|
free(f);
|
|
return fd;
|
|
}
|
|
|
|
int sha1write(struct sha1file *f, void *buf, unsigned int count)
|
|
{
|
|
if (f->do_crc)
|
|
f->crc32 = crc32(f->crc32, buf, count);
|
|
while (count) {
|
|
unsigned offset = f->offset;
|
|
unsigned left = sizeof(f->buffer) - offset;
|
|
unsigned nr = count > left ? left : count;
|
|
|
|
memcpy(f->buffer + offset, buf, nr);
|
|
count -= nr;
|
|
offset += nr;
|
|
buf = (char *) buf + nr;
|
|
left -= nr;
|
|
if (!left) {
|
|
SHA1_Update(&f->ctx, f->buffer, offset);
|
|
sha1flush(f, offset);
|
|
offset = 0;
|
|
}
|
|
f->offset = offset;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct sha1file *sha1fd(int fd, const char *name)
|
|
{
|
|
return sha1fd_throughput(fd, name, NULL);
|
|
}
|
|
|
|
struct sha1file *sha1fd_throughput(int fd, const char *name, struct progress *tp)
|
|
{
|
|
struct sha1file *f = xmalloc(sizeof(*f));
|
|
f->fd = fd;
|
|
f->offset = 0;
|
|
f->total = 0;
|
|
f->tp = tp;
|
|
f->name = name;
|
|
f->do_crc = 0;
|
|
SHA1_Init(&f->ctx);
|
|
return f;
|
|
}
|
|
|
|
void crc32_begin(struct sha1file *f)
|
|
{
|
|
f->crc32 = crc32(0, Z_NULL, 0);
|
|
f->do_crc = 1;
|
|
}
|
|
|
|
uint32_t crc32_end(struct sha1file *f)
|
|
{
|
|
f->do_crc = 0;
|
|
return f->crc32;
|
|
}
|