X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/a7c835af20feeb470238ead3bda36af978c2600f..f8477782df203e1998a8704e71a1a3cc699e9e3a:/apt-pkg/tagfile.cc?ds=sidebyside diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc index fdeb09329..dc1ba3f9e 100644 --- a/apt-pkg/tagfile.cc +++ b/apt-pkg/tagfile.cc @@ -1,6 +1,6 @@ // -*- mode: cpp; mode: fold -*- // Description /*{{{*/ -// $Id: tagfile.cc,v 1.28 2001/03/13 06:51:46 jgg Exp $ +// $Id: tagfile.cc,v 1.37.2.2 2003/12/31 16:02:30 mdz Exp $ /* ###################################################################### Fast scanner for RFC-822 type header information @@ -23,28 +23,32 @@ #include #include +#include /*}}}*/ +using std::string; + // TagFile::pkgTagFile - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ -pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) : Fd(*pFd), Size(Size) +pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) : + Fd(*pFd), + Size(Size) { - if (Fd.IsOpen() == false) + if (Fd.IsOpen() == false || Fd.Size() == 0) { Buffer = 0; Start = End = Buffer = 0; - Left = 0; iOffset = 0; + Map = NULL; return; } - Buffer = new char[Size]; - Start = End = Buffer; - Left = Fd.Size(); - TotalSize = Fd.Size(); + Map = new MMap (Fd, MMap::Public | MMap::ReadOnly); + Buffer = (char *) Map->Data (); + Start = Buffer; + End = Buffer + Map->Size (); iOffset = 0; - Fill(); } /*}}}*/ // TagFile::~pkgTagFile - Destructor /*{{{*/ @@ -52,7 +56,7 @@ pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) : Fd(*pFd), Size(Size) /* */ pkgTagFile::~pkgTagFile() { - delete [] Buffer; + delete Map; } /*}}}*/ // TagFile::Step - Advance to the next section /*{{{*/ @@ -60,69 +64,18 @@ pkgTagFile::~pkgTagFile() /* If the Section Scanner fails we refill the buffer and try again. */ bool pkgTagFile::Step(pkgTagSection &Tag) { + if (Start == End) + return false; + 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 %s (1)"),Fd.Name().c_str()); - } + return _error->Error(_("Unable to parse package file %s (1)"), + Fd.Name().c_str()); + } Start += Tag.size(); iOffset += Tag.size(); Tag.Trim(); - - 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 EndSize = End - Start; - - memmove(Buffer,Start,EndSize); - Start = Buffer; - End = Buffer + EndSize; - - if (Left == 0) - { - if (EndSize <= 3) - return false; - if (Size - (End - Buffer) < 4) - return true; - - // Append a double new line if one does not exist - unsigned int LineCount = 0; - for (const char *E = End - 1; E - End < 6 && (*E == '\n' || *E == '\r'); E--) - if (*E == '\n') - LineCount++; - for (; LineCount < 2; LineCount++) - *End++ = '\n'; - - return true; - } - - // See if only a bit of the file is left - if (Left < Size - (End - Buffer)) - { - if (Fd.Read(End,Left) == false) - return false; - - End += Left; - Left = 0; - } - else - { - if (Fd.Read(End,Size - (End - Buffer)) == false) - return false; - - Left -= Size - (End - Buffer); - End = Buffer + Size; - } return true; } /*}}}*/ @@ -143,20 +96,7 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset) // Reposition and reload.. iOffset = Offset; - Left = TotalSize - Offset; - if (Fd.Seek(Offset) == false) - return false; - End = Start = Buffer; - - if (Fill() == false) - return false; - - if (Tag.Scan(Start,End - Start) == true) - return true; - - // This appends a double new line (for the real eof handling) - if (Fill() == false) - return false; + Start = Buffer + iOffset; if (Tag.Scan(Start,End - Start) == false) return _error->Error(_("Unable to parse package file %s (2)"),Fd.Name().c_str()); @@ -183,11 +123,11 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength) Stop = Section = Start; memset(AlphaIndexes,0,sizeof(AlphaIndexes)); - if (Stop == 0) + if (Stop == 0 || MaxLength == 0) return false; TagCount = 0; - while (TagCount < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End) + while (TagCount+1 < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End) { // Start a new index and add it to the hash if (isspace(Stop[0]) == 0) @@ -201,19 +141,25 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength) if (Stop == 0) return false; - for (; Stop[1] == '\r' && Stop+1 < End; Stop++); + for (; Stop+1 < End && Stop[1] == '\r'; Stop++); // Double newline marks the end of the record if (Stop+1 < End && Stop[1] == '\n') { Indexes[TagCount] = Stop - Section; - for (; (Stop[0] == '\n' || Stop[0] == '\r') && Stop < End; Stop++); + for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r'); Stop++); return true; } Stop++; } + if ((Stop+1 >= End) && (End[-1] == '\n' || End[-1] == '\r')) + { + Indexes[TagCount] = (End - 1) - Section; + return true; + } + return false; } /*}}}*/