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pack.h: define largest possible encoded object size

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Several callers use fixed buffers for storing the pack
object header, and they've picked 10 as a magic number. This
is reasonable, since it handles objects up to 2^67. But
let's give them a constant so it's clear that the number
isn't pulled out of thin air.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2017-03-24 13:26:50 -04:00 committed by Junio C Hamano
parent 7202a6fa87
commit 2c5e2865cc
2 changed files with 10 additions and 2 deletions
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6
builtin/pack-objects.c
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@ -239,7 +239,8 @@ static unsigned long write_no_reuse_object(struct sha1file *f, struct object_ent
unsigned long limit, int usable_delta)
{
unsigned long size, datalen;
unsigned char header[10], dheader[10];
unsigned char header[MAX_PACK_OBJECT_HEADER],
dheader[MAX_PACK_OBJECT_HEADER];
unsigned hdrlen;
enum object_type type;
void *buf;
@ -353,7 +354,8 @@ static off_t write_reuse_object(struct sha1file *f, struct object_entry *entry,
off_t offset;
enum object_type type = entry->type;
off_t datalen;
unsigned char header[10], dheader[10];
unsigned char header[MAX_PACK_OBJECT_HEADER],
dheader[MAX_PACK_OBJECT_HEADER];
unsigned hdrlen;
if (entry->delta)

6
pack.h
View file

@ -84,6 +84,12 @@ extern int verify_pack(struct packed_git *, verify_fn fn, struct progress *, uin
extern off_t write_pack_header(struct sha1file *f, uint32_t);
extern void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t, unsigned char *, off_t);
extern char *index_pack_lockfile(int fd);
/*
* The "hdr" output buffer should be at least this big, which will handle sizes
* up to 2^67.
*/
#define MAX_PACK_OBJECT_HEADER 10
extern int encode_in_pack_object_header(unsigned char *hdr, int hdr_len,
enum object_type, uintmax_t);