X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/a7c835af20feeb470238ead3bda36af978c2600f..cce08fb5aca7dd01706cecea845b183dc62b1717:/apt-pkg/tagfile.cc?ds=sidebyside diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc index fdeb09329..85e6abfd7 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 @@ -11,10 +11,6 @@ ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ -#ifdef __GNUG__ -#pragma implementation "apt-pkg/tagfile.h" -#endif - #include #include #include @@ -23,26 +19,30 @@ #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) { Buffer = 0; Start = End = Buffer = 0; - Left = 0; + Done = true; iOffset = 0; return; } Buffer = new char[Size]; Start = End = Buffer; - Left = Fd.Size(); - TotalSize = Fd.Size(); + Done = false; iOffset = 0; Fill(); } @@ -55,24 +55,57 @@ pkgTagFile::~pkgTagFile() delete [] Buffer; } /*}}}*/ +// TagFile::Resize - Resize the internal buffer /*{{{*/ +// --------------------------------------------------------------------- +/* Resize the internal buffer (double it in size). Fail if a maximum size + * size is reached. + */ +bool pkgTagFile::Resize() +{ + char *tmp; + unsigned long EndSize = End - Start; + + // fail is the buffer grows too big + if(Size > 1024*1024+1) + return false; + + // get new buffer and use it + tmp = new char[2*Size]; + memcpy(tmp, Buffer, Size); + Size = Size*2; + delete [] Buffer; + Buffer = tmp; + + // update the start/end pointers to the new buffer + Start = Buffer; + End = Start + EndSize; + return true; +} + // TagFile::Step - Advance to the next section /*{{{*/ // --------------------------------------------------------------------- -/* If the Section Scanner fails we refill the buffer and try again. */ +/* If the Section Scanner fails we refill the buffer and try again. + * If that fails too, double the buffer size and try again until a + * maximum buffer is reached. + */ bool pkgTagFile::Step(pkgTagSection &Tag) { - if (Tag.Scan(Start,End - Start) == false) + while (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()); - } + if(Tag.Scan(Start,End - Start)) + break; + + if (Resize() == false) + return _error->Error(_("Unable to parse package file %s (1)"), + Fd.Name().c_str()); + } Start += Tag.size(); iOffset += Tag.size(); Tag.Trim(); - return true; } /*}}}*/ @@ -83,14 +116,25 @@ bool pkgTagFile::Step(pkgTagSection &Tag) bool pkgTagFile::Fill() { unsigned long EndSize = End - Start; + unsigned long Actual = 0; memmove(Buffer,Start,EndSize); Start = Buffer; End = Buffer + EndSize; - if (Left == 0) + if (Done == false) + { + // See if only a bit of the file is left + if (Fd.Read(End,Size - (End - Buffer),&Actual) == false) + return false; + if (Actual != Size - (End - Buffer)) + Done = true; + End += Actual; + } + + if (Done == true) { - if (EndSize <= 3) + if (EndSize <= 3 && Actual == 0) return false; if (Size - (End - Buffer) < 4) return true; @@ -106,23 +150,6 @@ bool pkgTagFile::Fill() 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; } /*}}}*/ @@ -143,7 +170,7 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset) // Reposition and reload.. iOffset = Offset; - Left = TotalSize - Offset; + Done = false; if (Fd.Seek(Offset) == false) return false; End = Start = Buffer; @@ -168,12 +195,12 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset) // --------------------------------------------------------------------- /* This looks for the first double new line in the data stream. It also indexes the tags in the section. This very simple hash function for the - first 3 letters gives very good performance on the debian package files */ + last 8 letters gives very good performance on the debian package files */ inline static unsigned long AlphaHash(const char *Text, const char *End = 0) { unsigned long Res = 0; for (; Text != End && *Text != ':' && *Text != 0; Text++) - Res = (unsigned long)(*Text) ^ (Res << 2); + Res = ((unsigned long)(*Text) & 0xDF) ^ (Res << 1); return Res & 0xFF; } @@ -187,7 +214,7 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength) 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) @@ -201,13 +228,13 @@ 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; } @@ -396,7 +423,8 @@ static const char *iTFRewritePackageOrder[] = { "Filename", "Size", "MD5Sum", - "SHA1Sum", + "SHA1", + "SHA256", "MSDOS-Filename", // Obsolete "Description", 0};