From 1849aa2a72d7f530e2c18d640528075bcdf8991c Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Fri, 20 Jun 2003 10:40:25 +0000 Subject: * Refactoring: move dump function into archive.cc. --- src/archive.hh | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 src/archive.hh (limited to 'src/archive.hh') diff --git a/src/archive.hh b/src/archive.hh new file mode 100644 index 000000000000..bfd96b45c03e --- /dev/null +++ b/src/archive.hh @@ -0,0 +1,48 @@ +#include + +using namespace std; + + +/* 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 string & path, DumpSink & sink); -- cgit 1.4.1