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* Path hashing.

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This commit is contained in:
Eelco Dolstra 2003-06-16 15:59:23 +00:00
parent a09e66da5a
commit 2f04e7102e
5 changed files with 178 additions and 8 deletions
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19
src/hash.hh
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@ -50,6 +50,11 @@ Hash hashFile(const string & fileName);
follows:
hash(path) = md5(dump(path))
*/
Hash hashPath(const string & path);
/* Dump a path as follows:
IF path points to a REGULAR FILE:
dump(path) = attrs(
@ -60,7 +65,7 @@ Hash hashFile(const string & fileName);
IF path points to a DIRECTORY:
dump(path) = attrs(
[ ("type", "directory")
, ("entries", concat(map(f, entries(path))))
, ("entries", concat(map(f, sort(entries(path)))))
])
where f(fn) = attrs(
[ ("name", fn)
@ -72,17 +77,25 @@ Hash hashFile(const string & fileName);
attrs(as) = concat(map(attr, as)) + encN(0)
attrs((a, b)) = encS(a) + encS(b)
encS(s) = encN(len(s)) + s
encS(s) = encN(len(s)) + s + (padding until next 64-bit boundary)
encN(n) = 64-bit little-endian encoding of n.
contents(path) = the contents of a regular file.
sort(strings) = lexicographic sort by 8-bit value (strcmp).
entries(path) = the entries of a directory, without `.' and
`..'.
`+' denotes string concatenation. */
Hash hashPath(const string & path);
struct DumpSink
{
virtual void operator () (const unsigned char * data, unsigned int len) = 0;
};
void dumpPath(const string & path, DumpSink & sink);
#endif /* !__HASH_H */