diff options
Diffstat (limited to 'pack.h')
| -rw-r--r-- | pack.h | 76 |
1 files changed, 60 insertions, 16 deletions
@@ -2,6 +2,7 @@ #define PACK_H #include "object.h" +#include "csum-file.h" /* * Packed object header @@ -16,24 +17,15 @@ struct pack_header { }; /* - * Packed object index header - * - * struct pack_idx_header { - * uint32_t idx_signature; - * uint32_t idx_version; - * }; - * - * Note: this header isn't active yet. In future versions of git - * we may change the index file format. At that time we would start - * the first four bytes of the new index format with this signature, - * as all older git binaries would find this value illegal and abort - * reading the file. + * The first four bytes of index formats later than version 1 should + * start with this signature, as all older git binaries would find this + * value illegal and abort reading the file. * * This is the case because the number of objects in a packfile * cannot exceed 1,431,660,000 as every object would need at least - * 3 bytes of data and the overall packfile cannot exceed 4 GiB due - * to the 32 bit offsets used by the index. Clearly the signature - * exceeds this maximum. + * 3 bytes of data and the overall packfile cannot exceed 4 GiB with + * version 1 of the index file due to the offsets limited to 32 bits. + * Clearly the signature exceeds this maximum. * * Very old git binaries will also compare the first 4 bytes to the * next 4 bytes in the index and abort with a "non-monotonic index" @@ -43,10 +35,62 @@ struct pack_header { */ #define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */ -extern int verify_pack(struct packed_git *, int); +struct pack_idx_option { + unsigned flags; + /* flag bits */ +#define WRITE_IDX_VERIFY 01 /* verify only, do not write the idx file */ +#define WRITE_IDX_STRICT 02 + + uint32_t version; + uint32_t off32_limit; + + /* + * List of offsets that would fit within off32_limit but + * need to be written out as 64-bit entity for byte-for-byte + * verification. + */ + int anomaly_alloc, anomaly_nr; + uint32_t *anomaly; +}; + +extern void reset_pack_idx_option(struct pack_idx_option *); + +/* + * Packed object index header + */ +struct pack_idx_header { + uint32_t idx_signature; + uint32_t idx_version; +}; + +/* + * Common part of object structure used for write_idx_file + */ +struct pack_idx_entry { + unsigned char sha1[20]; + uint32_t crc32; + off_t offset; +}; + + +struct progress; +typedef int (*verify_fn)(const unsigned char*, enum object_type, unsigned long, void*, int*); + +extern const char *write_idx_file(const char *index_name, struct pack_idx_entry **objects, int nr_objects, const struct pack_idx_option *, const unsigned char *sha1); +extern int check_pack_crc(struct packed_git *p, struct pack_window **w_curs, off_t offset, off_t len, unsigned int nr); +extern int verify_pack_index(struct packed_git *); +extern int verify_pack(struct packed_git *, verify_fn fn, struct progress *, uint32_t); +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); +extern int encode_in_pack_object_header(enum object_type, uintmax_t, unsigned char *); #define PH_ERROR_EOF (-1) #define PH_ERROR_PACK_SIGNATURE (-2) #define PH_ERROR_PROTOCOL (-3) extern int read_pack_header(int fd, struct pack_header *); + +extern struct sha1file *create_tmp_packfile(char **pack_tmp_name); +extern void finish_tmp_packfile(struct strbuf *name_buffer, const char *pack_tmp_name, struct pack_idx_entry **written_list, uint32_t nr_written, struct pack_idx_option *pack_idx_opts, unsigned char sha1[]); + #endif |