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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: tagfile.cc,v 1.3 1998/07/04 22:32:14 jgg Exp $
/* ######################################################################
Fast scanner for RFC-822 type header information
This uses a rotating 64K buffer to load the package information into.
The scanner runs over it and isolates and indexes a single section.
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include <pkglib/tagfile.h>
#include <pkglib/error.h>
#include <string>
#include <stdio.h>
/*}}}*/
// TagFile::pkgTagFile - Constructor /*{{{*/
// ---------------------------------------------------------------------
/* */
pkgTagFile::pkgTagFile(File &Fd) : Fd(Fd)
{
Buffer = new char[64*1024];
Start = End = Buffer + 64*1024;
Left = Fd.Size();
Fill();
}
/*}}}*/
// TagFile::Step - Advance to the next section /*{{{*/
// ---------------------------------------------------------------------
/* If the Section Scanner fails we refill the buffer and try again. */
bool pkgTagFile::Step(pkgTagSection &Tag)
{
if (Tag.Scan(Start,End - Start) == false)
{
if (Fill() == false)
return false;
if (Tag.Scan(Start,End - Start) == false)
return _error->Error("Unable to parse package file");
}
Start += Tag.Length();
return true;
}
/*}}}*/
// TagFile::Fill - Top up the buffer /*{{{*/
// ---------------------------------------------------------------------
/* This takes the bit at the end of the buffer and puts it at the start
then fills the rest from the file */
bool pkgTagFile::Fill()
{
unsigned long Size = End - Start;
if (Left == 0)
{
if (Size <= 1)
return false;
return true;
}
memmove(Buffer,Start,Size);
Start = Buffer;
// See if only a bit of the file is left or if
if (Left < End - Buffer - Size)
{
if (Fd.Read(Buffer + Size,Left) == false)
return false;
End = Buffer + Size + Left;
Left = 0;
}
else
{
if (Fd.Read(Buffer + Size, End - Buffer - Size) == false)
return false;
Left -= End - Buffer - Size;
}
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
indexes the tags in the section. */
bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
{
const char *End = Start + MaxLength;
Stop = Section = Start;
TagCount = 0;
Indexes[TagCount++] = Stop - Section;
Stop++;
for (; Stop < End; Stop++)
{
if (Stop[-1] != '\n')
continue;
if (Stop[0] == '\n')
{
// Extra one at the end to simplify find
Indexes[TagCount] = Stop - Section;
for (; Stop[0] == '\n' && Stop < End; Stop++);
return true;
break;
}
if (isspace(Stop[0]) == 0)
Indexes[TagCount++] = Stop - Section;
// Just in case.
if (TagCount > sizeof(Indexes)/sizeof(Indexes[0]))
TagCount = sizeof(Indexes)/sizeof(Indexes[0]);
}
return false;
}
/*}}}*/
// TagSection::Find - Locate a tag /*{{{*/
// ---------------------------------------------------------------------
/* This searches the section for a tag that matches the given string. */
bool pkgTagSection::Find(const char *Tag,const char *&Start,
const char *&End)
{
unsigned int Length = strlen(Tag);
for (unsigned int I = 0; I != TagCount; I++)
{
if (strncasecmp(Tag,Section + Indexes[I],Length) != 0)
continue;
// Make sure the colon is in the right place
const char *C = Section + Length + Indexes[I];
for (; isspace(*C) != 0; C++);
if (*C != ':')
continue;
// Strip off the gunk from the start end
Start = C;
End = Section + Indexes[I+1];
for (; (isspace(*Start) != 0 || *Start == ':') && Start < End; Start++);
for (; isspace(End[-1]) != 0 && End > Start; End--);
return true;
}
Start = End = 0;
return false;
}
/*}}}*/
#include <pkglib/pkgcachegen.h>
#include <pkglib/deblistparser.h>
int main(int argc,char *argv[])
{
{
File F(argv[1],File::ReadOnly);
File CacheF("./cache",File::WriteEmpty);
DynamicMMap Map(CacheF,MMap::Public);
pkgCacheGenerator Gen(Map);
Gen.SelectFile(argv[1]);
debListParser Parser(F);
Gen.MergeList(Parser);
}
{
File CacheF("./cache",File::WriteExists);
MMap Map(CacheF,MMap::Public | MMap::ReadOnly);
pkgCache Cache(Map);
for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
{
cout << "Package: " << I.Name() << endl;
for (pkgCache::VerIterator V = I.VersionList(); V.end() == false; V++)
{
cout << "Version: " << V.VerStr() << endl;
cout << "Size: " << V->Size << endl;
cout << "Installed-Size: " << V->InstalledSize << endl;
cout << "Section: " << V.Section() << endl;
cout << "Priority: " << Cache.Priority(V->Priority) << endl;
}
cout << endl;
}
}
#if 0
pkgTagSection I;
while (Test.Step(I) == true)
{
const char *Start;
const char *End;
if (I.Find("Package",Start,End) == false)
{
cout << "Failed" << endl;
continue;
}
cout << "Package: " << string(Start,End - Start) << endl;
/* for (const char *I = Start; I < End; I++)
{
const char *Begin = I;
bool Number = true;
while (isspace(*I) == 0 && ispunct(*I) == 0 && I < End)
{
if (isalpha(*I) != 0)
Number = false;
I++;
}
if (Number == false)
cout << string(Begin,I-Begin) << endl;
while ((isspace(*I) != 0 || ispunct(*I) != 0) && I < End)
I++;
I--;
} */
}
#endif
_error->DumpErrors();
}
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