| #ifndef CHUNK_FORMAT_H |
| #define CHUNK_FORMAT_H |
| |
| #include "hash.h" |
| |
| struct hashfile; |
| struct chunkfile; |
| |
| #define CHUNK_TOC_ENTRY_SIZE (sizeof(uint32_t) + sizeof(uint64_t)) |
| |
| /* |
| * Initialize a 'struct chunkfile' for writing _or_ reading a file |
| * with the chunk format. |
| * |
| * If writing a file, supply a non-NULL 'struct hashfile *' that will |
| * be used to write. |
| * |
| * If reading a file, use a NULL 'struct hashfile *' and then call |
| * read_table_of_contents(). Supply the memory-mapped data to the |
| * pair_chunk() or read_chunk() methods, as appropriate. |
| * |
| * DO NOT MIX THESE MODES. Use different 'struct chunkfile' instances |
| * for reading and writing. |
| */ |
| struct chunkfile *init_chunkfile(struct hashfile *f); |
| void free_chunkfile(struct chunkfile *cf); |
| int get_num_chunks(struct chunkfile *cf); |
| typedef int (*chunk_write_fn)(struct hashfile *f, void *data); |
| void add_chunk(struct chunkfile *cf, |
| uint32_t id, |
| size_t size, |
| chunk_write_fn fn); |
| int write_chunkfile(struct chunkfile *cf, void *data); |
| |
| int read_table_of_contents(struct chunkfile *cf, |
| const unsigned char *mfile, |
| size_t mfile_size, |
| uint64_t toc_offset, |
| int toc_length, |
| unsigned expected_alignment); |
| |
| #define CHUNK_NOT_FOUND (-2) |
| |
| /* |
| * Find 'chunk_id' in the given chunkfile and assign the |
| * given pointer to the position in the mmap'd file where |
| * that chunk begins. Likewise the "size" parameter is filled |
| * with the size of the chunk. |
| * |
| * Returns CHUNK_NOT_FOUND if the chunk does not exist. |
| */ |
| int pair_chunk(struct chunkfile *cf, |
| uint32_t chunk_id, |
| const unsigned char **p, |
| size_t *size); |
| |
| typedef int (*chunk_read_fn)(const unsigned char *chunk_start, |
| size_t chunk_size, void *data); |
| /* |
| * Find 'chunk_id' in the given chunkfile and call the |
| * given chunk_read_fn method with the information for |
| * that chunk. |
| * |
| * Returns CHUNK_NOT_FOUND if the chunk does not exist. |
| */ |
| int read_chunk(struct chunkfile *cf, |
| uint32_t chunk_id, |
| chunk_read_fn fn, |
| void *data); |
| |
| uint8_t oid_version(const struct git_hash_algo *algop); |
| |
| #endif |