From 8798fae30450a88c339c8f23d7e0c75f5df2ef1c Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Tue, 18 Nov 2003 10:47:59 +0000 Subject: * Source tree refactoring. --- src/libutil/archive.hh | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 src/libutil/archive.hh (limited to 'src/libutil/archive.hh') diff --git a/src/libutil/archive.hh b/src/libutil/archive.hh new file mode 100644 index 000000000000..67e236668a06 --- /dev/null +++ b/src/libutil/archive.hh @@ -0,0 +1,60 @@ +#include + +#include "util.hh" + + +/* dumpPath creates a Nix archive of the specified path. The format + is as follows: + + IF path points to a REGULAR FILE: + dump(path) = attrs( + [ ("type", "regular") + , ("contents", contents(path)) + ]) + + IF path points to a DIRECTORY: + dump(path) = attrs( + [ ("type", "directory") + , ("entries", concat(map(f, sort(entries(path))))) + ]) + where f(fn) = attrs( + [ ("name", fn) + , ("file", dump(path + "/" + fn)) + ]) + + where: + + attrs(as) = concat(map(attr, as)) + encN(0) + attrs((a, b)) = encS(a) + encS(b) + + 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. */ + +struct DumpSink +{ + virtual void operator () (const unsigned char * data, unsigned int len) = 0; +}; + +void dumpPath(const Path & path, DumpSink & sink); + + +struct RestoreSource +{ + /* The callee should store exactly *len bytes in the buffer + pointed to by data. It should block if that much data is not + yet available, or throw an error if it is not going to be + available. */ + virtual void operator () (unsigned char * data, unsigned int len) = 0; +}; + +void restorePath(const Path & path, RestoreSource & source); -- cgit 1.4.1