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streaming: make streaming-write-entry to be more reusable

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The static function in entry.c takes a cache entry and streams its blob
contents to a file in the working tree.  Refactor the logic to a new API
function stream_blob_to_fd() that takes an object name and an open file
descriptor, so that it can be reused by other callers.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2012-03-07 17:54:15 +07:00
parent 2980b0de1b
commit 47a02ff2ca
3 changed files with 62 additions and 48 deletions
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55
streaming.c
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@ -489,3 +489,58 @@ static open_method_decl(incore)
return st->u.incore.buf ? 0 : -1;
}
/****************************************************************
* Users of streaming interface
****************************************************************/
int stream_blob_to_fd(int fd, unsigned const char *sha1, struct stream_filter *filter,
int can_seek)
{
struct git_istream *st;
enum object_type type;
unsigned long sz;
ssize_t kept = 0;
int result = -1;
st = open_istream(sha1, &type, &sz, filter);
if (!st)
return result;
if (type != OBJ_BLOB)
goto close_and_exit;
for (;;) {
char buf[1024 * 16];
ssize_t wrote, holeto;
ssize_t readlen = read_istream(st, buf, sizeof(buf));
if (!readlen)
break;
if (can_seek && sizeof(buf) == readlen) {
for (holeto = 0; holeto < readlen; holeto++)
if (buf[holeto])
break;
if (readlen == holeto) {
kept += holeto;
continue;
}
}
if (kept && lseek(fd, kept, SEEK_CUR) == (off_t) -1)
goto close_and_exit;
else
kept = 0;
wrote = write_in_full(fd, buf, readlen);
if (wrote != readlen)
goto close_and_exit;
}
if (kept && (lseek(fd, kept - 1, SEEK_CUR) == (off_t) -1 ||
write(fd, "", 1) != 1))
goto close_and_exit;
result = 0;
close_and_exit:
close_istream(st);
return result;
}