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Two basic functions are provided: - convert_object_file Takes an object file it's type and hash algorithm and converts it into the equivalent object file that would have been generated with hash algorithm "to". For blob objects there is no conversation to be done and it is an error to use this function on them. For commit, tree, and tag objects embedded oids are replaced by the oids of the objects they refer to with those objects and their object ids reencoded in with the hash algorithm "to". Signatures are rearranged so that they remain valid after the object has been reencoded. - repo_oid_to_algop which takes an oid that refers to an object file and returns the oid of the equivalent object file generated with the target hash algorithm. The pair of files object-file-convert.c and object-file-convert.h are introduced to hold as much of this logic as possible to keep this conversion logic cleanly separated from everything else and in the hopes that someday the code will be clean enough git can support compiling out support for sha1 and the various conversion functions. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
25 lines
630 B
C
25 lines
630 B
C
#ifndef OBJECT_CONVERT_H
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#define OBJECT_CONVERT_H
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struct repository;
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struct object_id;
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struct git_hash_algo;
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struct strbuf;
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#include "object.h"
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int repo_oid_to_algop(struct repository *repo, const struct object_id *src,
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const struct git_hash_algo *to, struct object_id *dest);
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/*
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* Convert an object file from one hash algorithm to another algorithm.
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* Return -1 on failure, 0 on success.
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*/
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int convert_object_file(struct strbuf *outbuf,
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const struct git_hash_algo *from,
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const struct git_hash_algo *to,
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const void *buf, size_t len,
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enum object_type type,
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int gentle);
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#endif /* OBJECT_CONVERT_H */
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