diff options
Diffstat (limited to 'apt-pkg/tagfile.cc')
| -rw-r--r-- | apt-pkg/tagfile.cc | 49 |
1 files changed, 35 insertions, 14 deletions
diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc index 9ae55b7d8..953f8b4a6 100644 --- a/apt-pkg/tagfile.cc +++ b/apt-pkg/tagfile.cc @@ -1,11 +1,11 @@ // -*- mode: cpp; mode: fold -*- // Description /*{{{*/ -// $Id: tagfile.cc,v 1.8 1998/07/16 06:08:39 jgg Exp $ +// $Id: tagfile.cc,v 1.9 1998/07/19 04:22:06 jgg Exp $ /* ###################################################################### Fast scanner for RFC-822 type header information - This uses a rotating 64K buffer to load the package information into. + This uses a rotating buffer to load the package information into. The scanner runs over it and isolates and indexes a single section. ##################################################################### */ @@ -25,10 +25,10 @@ // TagFile::pkgTagFile - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ -pkgTagFile::pkgTagFile(File &Fd) : Fd(Fd) +pkgTagFile::pkgTagFile(File &Fd,unsigned long Size) : Fd(Fd), Size(Size) { - Buffer = new char[64*1024]; - Start = End = Buffer + 64*1024; + Buffer = new char[Size]; + Start = End = Buffer; Left = Fd.Size(); iOffset = 0; Fill(); @@ -59,35 +59,56 @@ bool pkgTagFile::Step(pkgTagSection &Tag) then fills the rest from the file */ bool pkgTagFile::Fill() { - unsigned long Size = End - Start; + unsigned long EndSize = End - Start; if (Left == 0) { - if (Size <= 1) + if (EndSize <= 1) return false; return true; } - memmove(Buffer,Start,Size); + memmove(Buffer,Start,EndSize); Start = Buffer; + End = Buffer + EndSize; - // See if only a bit of the file is left or if - if (Left < End - Buffer - Size) + // See if only a bit of the file is left + if (Left < Size) { - if (Fd.Read(Buffer + Size,Left) == false) + if (Fd.Read(End,Left) == false) return false; - End = Buffer + Size + Left; + End += Left; Left = 0; } else { - if (Fd.Read(Buffer + Size, End - Buffer - Size) == false) + if (Fd.Read(End,Size - (End - Buffer)) == false) return false; - Left -= End - Buffer - Size; + Left -= Size - (End - Buffer); + End = Buffer + Size; } return true; } /*}}}*/ +// TagFile::Jump - Jump to a pre-recorded location in the file /*{{{*/ +// --------------------------------------------------------------------- +/* This jumps to a pre-recorded file location and */ +bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset) +{ + iOffset = Offset; + Left = Fd.Size() - Offset; + if (Fd.Seek(Offset) == false) + return false; + End = Start = Buffer; + + if (Fill() == false) + return false; + + if (Tag.Scan(Start,End - Start) == false) + return _error->Error("Unable to parse package file"); + return true; +} + /*}}}*/ // TagSection::Scan - Scan for the end of the header information /*{{{*/ // --------------------------------------------------------------------- /* This looks for the first double new line in the data stream. It also |