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2022-05-27chunk-format.h: extract oid_version()Taylor Blau
There are three definitions of an identical function which converts `the_hash_algo` into either 1 (for SHA-1) or 2 (for SHA-256). There is a copy of this function for writing both the commit-graph and multi-pack-index file, and another inline definition used to write the .rev header. Consolidate these into a single definition in chunk-format.h. It's not clear that this is the best header to define this function in, but it should do for now. (Worth noting, the .rev caller expects a 4-byte unsigned, but the other two callers work with a single unsigned byte. The consolidated version uses the latter type, and lets the compiler widen it when required). Another caller will be added in a subsequent patch. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-02-19chunk-format: create read chunk APIDerrick Stolee
Add the capability to read the table of contents, then pair the chunks with necessary logic using read_chunk_fn pointers. Callers will be added in future changes, but the typical outline will be: 1. initialize a 'struct chunkfile' with init_chunkfile(NULL). 2. call read_table_of_contents(). 3. for each chunk to parse, a. call pair_chunk() to assign a pointer with the chunk position, or b. call read_chunk() to run a callback on the chunk start and size. 4. call free_chunkfile() to clear the 'struct chunkfile' data. We are re-using the anonymous 'struct chunkfile' data, as it is internal to the chunk-format API. This gives it essentially two modes: write and read. If the same struct instance was used for both reads and writes, then there would be failures. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-02-19chunk-format: create chunk format write APIDerrick Stolee
In anticipation of combining the logic from the commit-graph and multi-pack-index file formats, create a new chunk-format API. Use a 'struct chunkfile' pointer to keep track of data that has been registered for writes. This struct is anonymous outside of chunk-format.c to ensure no user attempts to interfere with the data. The next change will use this API in commit-graph.c, but the general approach is: 1. initialize the chunkfile with init_chunkfile(f). 2. add chunks in the intended writing order with add_chunk(). 3. write any header information to the hashfile f. 4. write the chunkfile data using write_chunkfile(). 5. free the chunkfile struct using free_chunkfile(). Helped-by: Taylor Blau <me@ttaylorr.com> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>