csum-file.h

   1 #ifndef CSUM_FILE_H
   2 #define CSUM_FILE_H
   3
   4 #include "hash.h"
   5
   6 struct progress;
   7
   8 /* A SHA1-protected file */
   9 struct hashfile {
  10         int fd;
  11         int check_fd;
  12         unsigned int offset;
  13         git_hash_ctx ctx;
  14         off_t total;
  15         struct progress *tp;
  16         const char *name;
  17         int do_crc;
  18         uint32_t crc32;
  19         unsigned char buffer[8192];
  20 };
  21
  22 /* Checkpoint */
  23 struct hashfile_checkpoint {
  24         off_t offset;
  25         git_hash_ctx ctx;
  26 };
  27
  28 void hashfile_checkpoint(struct hashfile *, struct hashfile_checkpoint *);
  29 int hashfile_truncate(struct hashfile *, struct hashfile_checkpoint *);
  30
  31 /* finalize_hashfile flags */
  32 #define CSUM_CLOSE              1
  33 #define CSUM_FSYNC              2
  34 #define CSUM_HASH_IN_STREAM     4
  35
  36 struct hashfile *hashfd(int fd, const char *name);
  37 struct hashfile *hashfd_check(const char *name);
  38 struct hashfile *hashfd_throughput(int fd, const char *name, struct progress *tp);
  39 int finalize_hashfile(struct hashfile *, unsigned char *, unsigned int);
  40 void hashwrite(struct hashfile *, const void *, unsigned int);
  41 void hashflush(struct hashfile *f);
  42 void crc32_begin(struct hashfile *);
  43 uint32_t crc32_end(struct hashfile *);
  44
  45 /*
  46  * Returns the total number of bytes fed to the hashfile so far (including ones
  47  * that have not been written out to the descriptor yet).
  48  */
  49 static inline off_t hashfile_total(struct hashfile *f)
  50 {
  51         return f->total + f->offset;
  52 }
  53
  54 static inline void hashwrite_u8(struct hashfile *f, uint8_t data)
  55 {
  56         hashwrite(f, &data, sizeof(data));
  57 }
  58
  59 static inline void hashwrite_be32(struct hashfile *f, uint32_t data)
  60 {
  61         data = htonl(data);
  62         hashwrite(f, &data, sizeof(data));
  63 }
  64
  65 static inline size_t hashwrite_be64(struct hashfile *f, uint64_t data)
  66 {
  67         data = htonll(data);
  68         hashwrite(f, &data, sizeof(data));
  69         return sizeof(data);
  70 }
  71
  72 #endif