From c8bae7493d2f2910b57f13ded012e86bdcfb0532 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 16:47:53 +0200 Subject: Adding upstream version 1:2.39.2. Signed-off-by: Daniel Baumann --- chunk-format.h | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 chunk-format.h (limited to 'chunk-format.h') diff --git a/chunk-format.h b/chunk-format.h new file mode 100644 index 0000000..7885aa0 --- /dev/null +++ b/chunk-format.h @@ -0,0 +1,71 @@ +#ifndef CHUNK_FORMAT_H +#define CHUNK_FORMAT_H + +#include "git-compat-util.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); + +#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); + +uint8_t oid_version(const struct git_hash_algo *algop); + +#endif -- cgit v1.2.3