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  1. #ifndef PACK_H
  2. #define PACK_H
  3. #include "object.h"
  4. #include "csum-file.h"
  5. struct repository;
  6. /*
  7. * Packed object header
  8. */
  9. #define PACK_SIGNATURE 0x5041434b /* "PACK" */
  10. #define PACK_VERSION 2
  11. #define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
  12. struct pack_header {
  13. uint32_t hdr_signature;
  14. uint32_t hdr_version;
  15. uint32_t hdr_entries;
  16. };
  17. /*
  18. * The first four bytes of index formats later than version 1 should
  19. * start with this signature, as all older git binaries would find this
  20. * value illegal and abort reading the file.
  21. *
  22. * This is the case because the number of objects in a packfile
  23. * cannot exceed 1,431,660,000 as every object would need at least
  24. * 3 bytes of data and the overall packfile cannot exceed 4 GiB with
  25. * version 1 of the index file due to the offsets limited to 32 bits.
  26. * Clearly the signature exceeds this maximum.
  27. *
  28. * Very old git binaries will also compare the first 4 bytes to the
  29. * next 4 bytes in the index and abort with a "non-monotonic index"
  30. * error if the second 4 byte word is smaller than the first 4
  31. * byte word. This would be true in the proposed future index
  32. * format as idx_signature would be greater than idx_version.
  33. */
  34. #define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */
  35. struct pack_idx_option {
  36. unsigned flags;
  37. /* flag bits */
  38. #define WRITE_IDX_VERIFY 01 /* verify only, do not write the idx file */
  39. #define WRITE_IDX_STRICT 02
  40. uint32_t version;
  41. uint32_t off32_limit;
  42. /*
  43. * List of offsets that would fit within off32_limit but
  44. * need to be written out as 64-bit entity for byte-for-byte
  45. * verification.
  46. */
  47. int anomaly_alloc, anomaly_nr;
  48. uint32_t *anomaly;
  49. };
  50. void reset_pack_idx_option(struct pack_idx_option *);
  51. /*
  52. * Packed object index header
  53. */
  54. struct pack_idx_header {
  55. uint32_t idx_signature;
  56. uint32_t idx_version;
  57. };
  58. /*
  59. * Common part of object structure used for write_idx_file
  60. */
  61. struct pack_idx_entry {
  62. struct object_id oid;
  63. uint32_t crc32;
  64. off_t offset;
  65. };
  66. struct progress;
  67. /* Note, the data argument could be NULL if object type is blob */
  68. typedef int (*verify_fn)(const struct object_id *, enum object_type, unsigned long, void*, int*);
  69. 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);
  70. int check_pack_crc(struct packed_git *p, struct pack_window **w_curs, off_t offset, off_t len, unsigned int nr);
  71. int verify_pack_index(struct packed_git *);
  72. int verify_pack(struct repository *, struct packed_git *, verify_fn fn, struct progress *, uint32_t);
  73. off_t write_pack_header(struct hashfile *f, uint32_t);
  74. void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t, unsigned char *, off_t);
  75. char *index_pack_lockfile(int fd);
  76. /*
  77. * The "hdr" output buffer should be at least this big, which will handle sizes
  78. * up to 2^67.
  79. */
  80. #define MAX_PACK_OBJECT_HEADER 10
  81. int encode_in_pack_object_header(unsigned char *hdr, int hdr_len,
  82. enum object_type, uintmax_t);
  83. #define PH_ERROR_EOF (-1)
  84. #define PH_ERROR_PACK_SIGNATURE (-2)
  85. #define PH_ERROR_PROTOCOL (-3)
  86. int read_pack_header(int fd, struct pack_header *);
  87. struct hashfile *create_tmp_packfile(char **pack_tmp_name);
  88. 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[]);
  89. #endif