X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/fe06d72cb3a26eba89d897098a3d22c9a9d11179..847d81b8e95610240f782daeaf154df69b3dd80c:/apt-pkg/tagfile.cc diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc index ab3647fd8..7c5d15a58 100644 --- a/apt-pkg/tagfile.cc +++ b/apt-pkg/tagfile.cc @@ -1,6 +1,6 @@ // -*- mode: cpp; mode: fold -*- // Description /*{{{*/ -// $Id: tagfile.cc,v 1.32 2002/03/26 07:22:31 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 @@ -31,7 +27,9 @@ 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) { @@ -57,20 +55,53 @@ 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) + if(Tag.Scan(Start,End - Start)) + break; + + if (Resize() == false) return _error->Error(_("Unable to parse package file %s (1)"), - Fd.Name().c_str()); - } + Fd.Name().c_str()); + } Start += Tag.size(); iOffset += Tag.size(); @@ -85,6 +116,7 @@ bool pkgTagFile::Step(pkgTagSection &Tag) bool pkgTagFile::Fill() { unsigned long EndSize = End - Start; + unsigned long Actual = 0; memmove(Buffer,Start,EndSize); Start = Buffer; @@ -93,7 +125,6 @@ bool pkgTagFile::Fill() if (Done == false) { // See if only a bit of the file is left - unsigned long Actual; if (Fd.Read(End,Size - (End - Buffer),&Actual) == false) return false; if (Actual != Size - (End - Buffer)) @@ -103,7 +134,7 @@ bool pkgTagFile::Fill() if (Done == true) { - if (EndSize <= 3) + if (EndSize <= 3 && Actual == 0) return false; if (Size - (End - Buffer) < 4) return true; @@ -164,12 +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; } @@ -181,10 +212,12 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength) if (Stop == 0) return false; - + TagCount = 0; while (TagCount+1 < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End) { + TrimRecord(true,End); + // Start a new index and add it to the hash if (isspace(Stop[0]) == 0) { @@ -196,14 +229,14 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength) if (Stop == 0) return false; - - for (; Stop+1 < End && Stop[1] == '\r'; 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 < End && (Stop[0] == '\n' || Stop[0] == '\r'); Stop++); + TrimRecord(false,End); return true; } @@ -213,6 +246,16 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength) return false; } /*}}}*/ +// TagSection::TrimRecord - Trim off any garbage before/after a record /*{{{*/ +// --------------------------------------------------------------------- +/* There should be exactly 2 newline at the end of the record, no more. */ +void pkgTagSection::TrimRecord(bool BeforeRecord, const char*& End) +{ + if (BeforeRecord == true) + return; + for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r'); Stop++); +} + /*}}}*/ // TagSection::Trim - Trim off any trailing garbage /*{{{*/ // --------------------------------------------------------------------- /* There should be exactly 1 newline at the end of the buffer, no more. */ @@ -359,7 +402,6 @@ bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags, return true; } /*}}}*/ - // TFRewrite - Rewrite a control record /*{{{*/ // --------------------------------------------------------------------- /* This writes the control record to stdout rewriting it as necessary. The @@ -388,11 +430,13 @@ static const char *iTFRewritePackageOrder[] = { "Recommends", "Suggests", "Conflicts", + "Breaks", "Conffiles", "Filename", "Size", "MD5Sum", - "SHA1Sum", + "SHA1", + "SHA256", "MSDOS-Filename", // Obsolete "Description", 0};