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streaming: read loose objects incrementally 

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2011-05-14 19:17:10 -07:00
parent f0270efd46
commit 93aa7bd595
1 changed files with 82 additions and 3 deletions
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85
streaming.c
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@ -61,8 +61,11 @@ struct git_istream {
} incore;
struct {
int fd; /* open for reading */
/* NEEDSWORK: what else? */
void *mapped;
unsigned long mapsize;
char hdr[32];
int hdr_avail;
int hdr_used;
} loose;
struct {
@ -150,9 +153,85 @@ static void close_deflated_stream(struct git_istream *st)
*
*****************************************************************/
static read_method_decl(loose)
{
size_t total_read = 0;
switch (st->z_state) {
case z_done:
return 0;
case z_error:
return -1;
default:
break;
}
if (st->u.loose.hdr_used < st->u.loose.hdr_avail) {
size_t to_copy = st->u.loose.hdr_avail - st->u.loose.hdr_used;
if (sz < to_copy)
to_copy = sz;
memcpy(buf, st->u.loose.hdr + st->u.loose.hdr_used, to_copy);
st->u.loose.hdr_used += to_copy;
total_read += to_copy;
}
while (total_read < sz) {
int status;
st->z.next_out = (unsigned char *)buf + total_read;
st->z.avail_out = sz - total_read;
status = git_inflate(&st->z, Z_FINISH);
total_read = st->z.next_out - (unsigned char *)buf;
if (status == Z_STREAM_END) {
git_inflate_end(&st->z);
st->z_state = z_done;
break;
}
if (status != Z_OK && status != Z_BUF_ERROR) {
git_inflate_end(&st->z);
st->z_state = z_error;
return -1;
}
}
return total_read;
}
static close_method_decl(loose)
{
close_deflated_stream(st);
munmap(st->u.loose.mapped, st->u.loose.mapsize);
return 0;
}
static struct stream_vtbl loose_vtbl = {
close_istream_loose,
read_istream_loose,
};
static open_method_decl(loose)
{
return -1; /* for now */
st->u.loose.mapped = map_sha1_file(sha1, &st->u.loose.mapsize);
if (!st->u.loose.mapped)
return -1;
if (unpack_sha1_header(&st->z,
st->u.loose.mapped,
st->u.loose.mapsize,
st->u.loose.hdr,
sizeof(st->u.loose.hdr)) < 0) {
git_inflate_end(&st->z);
munmap(st->u.loose.mapped, st->u.loose.mapsize);
return -1;
}
parse_sha1_header(st->u.loose.hdr, &st->size);
st->u.loose.hdr_used = strlen(st->u.loose.hdr) + 1;
st->u.loose.hdr_avail = st->z.total_out;
st->z_state = z_used;
st->vtbl = &loose_vtbl;
return 0;
}