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| #ifndef CHUNK_FORMAT_H | |
| #define CHUNK_FORMAT_H | |
| #include "git-compat-util.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); | |
| #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. | |
| * | |
| * Returns CHUNK_NOT_FOUND if the chunk does not exist. | |
| */ | |
| int pair_chunk(struct chunkfile *cf, | |
| uint32_t chunk_id, | |
| const unsigned char **p); | |
| 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); | |
| #endif |