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streaming: create structure for in-core object streams

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As explained in a preceding commit, we want to get rid of the union of
stream-type specific data in `struct odb_read_stream`. Create a new
structure for in-core object streams to move towards this design.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2025-11-23 19:59:31 +01:00 committed by Junio C Hamano
parent 595296e124
commit e030d0aeb5
1 changed files with 25 additions and 19 deletions
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44
streaming.c
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@ -39,11 +39,6 @@ struct odb_read_stream {
enum { z_unused, z_used, z_done, z_error } z_state;
union {
struct {
char *buf; /* from odb_read_object_info_extended() */
unsigned long read_ptr;
} incore;
struct {
void *mapped;
unsigned long mapsize;
@ -401,22 +396,30 @@ static int open_istream_pack_non_delta(struct odb_read_stream **out,
*
*****************************************************************/
static int close_istream_incore(struct odb_read_stream *st)
struct odb_incore_read_stream {
struct odb_read_stream base;
char *buf; /* from odb_read_object_info_extended() */
unsigned long read_ptr;
};
static int close_istream_incore(struct odb_read_stream *_st)
{
free(st->u.incore.buf);
struct odb_incore_read_stream *st = (struct odb_incore_read_stream *)_st;
free(st->buf);
return 0;
}
static ssize_t read_istream_incore(struct odb_read_stream *st, char *buf, size_t sz)
static ssize_t read_istream_incore(struct odb_read_stream *_st, char *buf, size_t sz)
{
struct odb_incore_read_stream *st = (struct odb_incore_read_stream *)_st;
size_t read_size = sz;
size_t remainder = st->size - st->u.incore.read_ptr;
size_t remainder = st->base.size - st->read_ptr;
if (remainder <= read_size)
read_size = remainder;
if (read_size) {
memcpy(buf, st->u.incore.buf + st->u.incore.read_ptr, read_size);
st->u.incore.read_ptr += read_size;
memcpy(buf, st->buf + st->read_ptr, read_size);
st->read_ptr += read_size;
}
return read_size;
}
@ -426,22 +429,25 @@ static int open_istream_incore(struct odb_read_stream **out,
const struct object_id *oid)
{
struct object_info oi = OBJECT_INFO_INIT;
struct odb_read_stream stream = {
.close = close_istream_incore,
.read = read_istream_incore,
struct odb_incore_read_stream stream = {
.base.close = close_istream_incore,
.base.read = read_istream_incore,
};
struct odb_incore_read_stream *st;
int ret;
oi.typep = &stream.type;
oi.sizep = &stream.size;
oi.contentp = (void **)&stream.u.incore.buf;
oi.typep = &stream.base.type;
oi.sizep = &stream.base.size;
oi.contentp = (void **)&stream.buf;
ret = odb_read_object_info_extended(r->objects, oid, &oi,
OBJECT_INFO_DIE_IF_CORRUPT);
if (ret)
return ret;
CALLOC_ARRAY(*out, 1);
**out = stream;
CALLOC_ARRAY(st, 1);
*st = stream;
*out = &st->base;
return 0;
}