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csum-file: introduce checksum_valid()

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Introduce a new function which checks the validity of a file's trailing
checksum. This is similar to hashfd_check(), but different since it is
intended to be used by callers who aren't writing the same data (like
`git index-pack --verify`), but who instead want to validate the
integrity of data that they are reading.

Rewrite the first of two callers which could benefit from this new
function in pack-check.c. Subsequent callers will be added in the
following patches.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau
2021-06-23 14:39:07 -04:00
committed by Junio C Hamano
parent ebf3c04b26
commit f9221e2cf5
3 changed files with 20 additions and 10 deletions
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3
csum-file.h
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@ -42,6 +42,9 @@ void hashflush(struct hashfile *f);
void crc32_begin(struct hashfile *);
uint32_t crc32_end(struct hashfile *);
/* Verify checksum validity while reading. Returns non-zero on success. */
int hashfile_checksum_valid(const unsigned char *data, size_t len);
/*
* Returns the total number of bytes fed to the hashfile so far (including ones
* that have not been written out to the descriptor yet).