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         size_t buffer_len;
  20         unsigned char *buffer;
  21         unsigned char *check_buffer;
  22 };
  23
  24 /* Checkpoint */
  25 struct hashfile_checkpoint {
  26         off_t offset;
  27         git_hash_ctx ctx;
  28 };
  29
  30 void hashfile_checkpoint(struct hashfile *, struct hashfile_checkpoint *);
  31 int hashfile_truncate(struct hashfile *, struct hashfile_checkpoint *);
  32
  33 /* finalize_hashfile flags */
  34 #define CSUM_CLOSE              1
  35 #define CSUM_FSYNC              2
  36 #define CSUM_HASH_IN_STREAM     4
  37
  38 struct hashfile *hashfd(int fd, const char *name);
  39 struct hashfile *hashfd_check(const char *name);
  40 struct hashfile *hashfd_throughput(int fd, const char *name, struct progress *tp);
  41 int finalize_hashfile(struct hashfile *, unsigned char *, unsigned int);
  42 void hashwrite(struct hashfile *, const void *, unsigned int);
  43 void hashflush(struct hashfile *f);
  44 void crc32_begin(struct hashfile *);
  45 uint32_t crc32_end(struct hashfile *);
  46
  47 /*
  48  * Returns the total number of bytes fed to the hashfile so far (including ones
  49  * that have not been written out to the descriptor yet).
  50  */
  51 static inline off_t hashfile_total(struct hashfile *f)
  52 {
  53         return f->total + f->offset;
  54 }
  55
  56 static inline void hashwrite_u8(struct hashfile *f, uint8_t data)
  57 {
  58         hashwrite(f, &data, sizeof(data));
  59 }
  60
  61 static inline void hashwrite_be32(struct hashfile *f, uint32_t data)
  62 {
  63         data = htonl(data);
  64         hashwrite(f, &data, sizeof(data));
  65 }
  66
  67 static inline size_t hashwrite_be64(struct hashfile *f, uint64_t data)
  68 {
  69         data = htonll(data);
  70         hashwrite(f, &data, sizeof(data));
  71         return sizeof(data);
  72 }
  73
  74 #endif