This struct is intended to be the successor of struct tree_desc. For
now it only holds a buffer for converting pv4 tree to canonical format.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
packv4-parse.c | 73 ++++++++++++++++++++++++++++------------------------------
packv4-parse.h | 9 ++++++++
2 files changed, 44 insertions(+), 38 deletions(-)
diff --git a/packv4-parse.c b/packv4-parse.c
index 7b096cb..f9db364 100644
--- a/packv4-parse.c
+++ b/packv4-parse.c
@@ -344,9 +344,8 @@ void *pv4_get_commit(struct packed_git *p, struct pack_window **w_curs,
return dst;
}
-static int copy_canonical_tree_entries(struct packed_git *p, off_t offset,
- unsigned int start, unsigned int count,
- unsigned char **dstp, unsigned long *sizep)
+static int copy_canonical_tree_entries(struct pv4_tree_desc *v4, off_t offset,
+ unsigned int start, unsigned int count)
{
void *data;
const unsigned char *from, *end;
@@ -354,7 +353,7 @@ static int copy_canonical_tree_entries(struct packed_git *p, off_t offset,
unsigned long size;
struct tree_desc desc;
- data = unpack_entry(p, offset, &type, &size);
+ data = unpack_entry(v4->p, offset, &type, &size);
if (!data)
return -1;
if (type != OBJ_TREE) {
@@ -372,13 +371,11 @@ static int copy_canonical_tree_entries(struct packed_git *p, off_t offset,
update_tree_entry(&desc);
end = desc.buffer;
- if (end - from > *sizep) {
+ if (end - from > strbuf_avail(&v4->buf)) {
free(data);
return -1;
}
- memcpy(*dstp, from, end - from);
- *dstp += end - from;
- *sizep -= end - from;
+ strbuf_add(&v4->buf, from, end - from);
free(data);
return 0;
}
@@ -417,7 +414,7 @@ static struct pv4_tree_cache *get_tree_offset_cache(struct packed_git *p, off_t
return c;
}
-static int tree_entry_prefix(unsigned char *buf, unsigned long size,
+static int tree_entry_prefix(char *buf, unsigned long size,
const unsigned char *path, int path_len,
unsigned mode)
{
@@ -443,35 +440,33 @@ static int tree_entry_prefix(unsigned char *buf, unsigned long size,
return len;
}
-static int generate_tree_entry(struct packed_git *p,
+static int generate_tree_entry(struct pv4_tree_desc *desc,
const unsigned char **bufp,
- unsigned char **dstp, unsigned long *sizep,
int what)
{
const unsigned char *path, *sha1;
+ char *buf = desc->buf.buf + desc->buf.len;
unsigned mode;
int len, pathlen;
- path = get_pathref(p, what >> 1, &pathlen);
- sha1 = get_sha1ref(p, bufp);
+ path = get_pathref(desc->p, what >> 1, &pathlen);
+ sha1 = get_sha1ref(desc->p, bufp);
if (!path || !sha1)
return -1;
mode = (path[0] << 8) | path[1];
- len = tree_entry_prefix(*dstp, *sizep,
+ len = tree_entry_prefix(buf, strbuf_avail(&desc->buf),
path + 2, pathlen - 2, mode);
- if (!len || len + 20 > *sizep)
+ if (!len || len + 20 > strbuf_avail(&desc->buf))
return -1;
- hashcpy(*dstp + len, sha1);
- len += 20;
- *dstp += len;
- *sizep -= len;
+ memcpy(buf + len, sha1, 20);
+ desc->buf.len += len + 20;
return 0;
}
-static int decode_entries(struct packed_git *p, struct pack_window **w_curs,
- off_t obj_offset, unsigned int start, unsigned int count,
- unsigned char **dstp, unsigned long *sizep)
+static int decode_entries(struct pv4_tree_desc *desc, off_t obj_offset,
+ unsigned int start, unsigned int count)
{
+ struct packed_git *p = desc->p;
unsigned long avail;
const unsigned char *src, *scp;
unsigned int curpos;
@@ -490,7 +485,7 @@ static int decode_entries(struct packed_git *p, struct pack_window **w_curs,
} else {
unsigned int nb_entries;
- src = use_pack(p, w_curs, obj_offset, &avail);
+ src = use_pack(p, &desc->w_curs, obj_offset, &avail);
scp = src;
/* we need to skip over the object header */
@@ -502,9 +497,8 @@ static int decode_entries(struct packed_git *p, struct pack_window **w_curs,
/* is this a canonical tree object? */
case OBJ_TREE:
case OBJ_REF_DELTA:
- return copy_canonical_tree_entries(p, obj_offset,
- start, count,
- dstp, sizep);
+ return copy_canonical_tree_entries(desc, obj_offset,
+ start, count);
/* let's still make sure this is actually a pv4 tree */
case OBJ_PV4_TREE:
break;
@@ -542,7 +536,7 @@ static int decode_entries(struct packed_git *p, struct pack_window **w_curs,
unsigned int what;
if (avail < 20) {
- src = use_pack(p, w_curs, offset, &avail);
+ src = use_pack(p, &desc->w_curs, offset, &avail);
if (avail < 20)
return -1;
}
@@ -568,7 +562,7 @@ static int decode_entries(struct packed_git *p, struct pack_window **w_curs,
/*
* This is an actual tree entry to recreate.
*/
- if (generate_tree_entry(p, &scp, dstp, sizep, what))
+ if (generate_tree_entry(desc, &scp, what))
return -1;
count--;
curpos++;
@@ -638,9 +632,8 @@ static int decode_entries(struct packed_git *p, struct pack_window **w_curs,
start = 0;
}
- ret = decode_entries(p, w_curs, copy_objoffset,
- copy_start, copy_count,
- dstp, sizep);
+ ret = decode_entries(desc, copy_objoffset,
+ copy_start, copy_count);
if (ret)
return ret;
@@ -672,17 +665,21 @@ static int decode_entries(struct packed_git *p, struct pack_window **w_curs,
void *pv4_get_tree(struct packed_git *p, struct pack_window **w_curs,
off_t obj_offset, unsigned long size)
{
- unsigned char *dst, *dcp;
+ struct pv4_tree_desc desc;
int ret;
- dst = xmallocz(size);
- dcp = dst;
- ret = decode_entries(p, w_curs, obj_offset, 0, 0, &dcp, &size);
- if (ret < 0 || size != 0) {
- free(dst);
+ memset(&desc, 0, sizeof(desc));
+ desc.p = p;
+ desc.w_curs = *w_curs;
+ strbuf_init(&desc.buf, size);
+
+ ret = decode_entries(&desc, obj_offset, 0, 0);
+ *w_curs = desc.w_curs;
+ if (ret < 0 || desc.buf.len != size) {
+ strbuf_release(&desc.buf);
return NULL;
}
- return dst;
+ return strbuf_detach(&desc.buf, NULL);
}
unsigned long pv4_unpack_object_header_buffer(const unsigned char *base,
diff --git a/packv4-parse.h b/packv4-parse.h
index b437159..cad7a82 100644
--- a/packv4-parse.h
+++ b/packv4-parse.h
@@ -22,4 +22,13 @@ void *pv4_get_commit(struct packed_git *p, struct pack_window **w_curs,
void *pv4_get_tree(struct packed_git *p, struct pack_window **w_curs,
off_t obj_offset, unsigned long size);
+struct pv4_tree_desc {
+ /* v4 entry */
+ struct packed_git *p;
+ struct pack_window *w_curs;
+
+ /* full canonical tree */
+ struct strbuf buf;
+};
+
#endif
--
1.8.2.83.gc99314b
--
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