X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/b2e465d6d32d2dc884f58b94acb7e35f671a87fe..0aae6d14390193e25ab6d0fd49295bd7b131954f:/apt-pkg/tagfile.cc diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc index 5d1144629..aa0f1eee8 100644 --- a/apt-pkg/tagfile.cc +++ b/apt-pkg/tagfile.cc @@ -1,6 +1,6 @@ // -*- mode: cpp; mode: fold -*- // Description /*{{{*/ -// $Id: tagfile.cc,v 1.26 2001/02/20 07:03:17 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 @@ -11,30 +11,64 @@ ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ -#ifdef __GNUG__ -#pragma implementation "apt-pkg/tagfile.h" -#endif +#include #include #include #include +#include -#include - #include #include +#include + +#include /*}}}*/ +using std::string; + +class pkgTagFilePrivate +{ +public: + pkgTagFilePrivate(FileFd *pFd, unsigned long long Size) : Fd(*pFd), Buffer(NULL), + Start(NULL), End(NULL), + Done(false), iOffset(0), + Size(Size) + { + } + FileFd &Fd; + char *Buffer; + char *Start; + char *End; + bool Done; + unsigned long long iOffset; + unsigned long long Size; +}; + // TagFile::pkgTagFile - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ -pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) : Fd(*pFd), Size(Size) +pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long long Size) { - Buffer = new char[Size]; - Start = End = Buffer; - Left = Fd.Size(); - TotalSize = Fd.Size(); - iOffset = 0; + /* The size is increased by 4 because if we start with the Size of the + filename we need to try to read 1 char more to see an EOF faster, 1 + char the end-pointer can be on and maybe 2 newlines need to be added + to the end of the file -> 4 extra chars */ + Size += 4; + d = new pkgTagFilePrivate(pFd, Size); + + if (d->Fd.IsOpen() == false) + { + d->Start = d->End = d->Buffer = 0; + d->Done = true; + d->iOffset = 0; + return; + } + + d->Buffer = new char[Size]; + d->Start = d->End = d->Buffer; + d->Done = false; + d->iOffset = 0; Fill(); } /*}}}*/ @@ -43,27 +77,71 @@ pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) : Fd(*pFd), Size(Size) /* */ pkgTagFile::~pkgTagFile() { - delete [] Buffer; + delete [] d->Buffer; + delete d; +} + /*}}}*/ +// TagFile::Offset - Return the current offset in the buffer /*{{{*/ +unsigned long pkgTagFile::Offset() +{ + return d->iOffset; +} + /*}}}*/ +// 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() +{ + // fail is the buffer grows too big + if(d->Size > 1024*1024+1) + return false; + + return Resize(d->Size * 2); +} +bool pkgTagFile::Resize(unsigned long long const newSize) +{ + unsigned long long const EndSize = d->End - d->Start; + char *tmp; + + // get new buffer and use it + tmp = new char[newSize]; + memcpy(tmp, d->Buffer, d->Size); + d->Size = newSize; + delete [] d->Buffer; + d->Buffer = tmp; + + // update the start/end pointers to the new buffer + d->Start = d->Buffer; + d->End = d->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(d->Start,d->End - d->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()); - } - Start += Tag.size(); - iOffset += Tag.size(); + if(Tag.Scan(d->Start,d->End - d->Start)) + break; + + if (Resize() == false) + return _error->Error(_("Unable to parse package file %s (1)"), + d->Fd.Name().c_str()); + } + d->Start += Tag.size(); + d->iOffset += Tag.size(); Tag.Trim(); - return true; } /*}}}*/ @@ -73,47 +151,47 @@ bool pkgTagFile::Step(pkgTagSection &Tag) then fills the rest from the file */ bool pkgTagFile::Fill() { - unsigned long EndSize = End - Start; + unsigned long long EndSize = d->End - d->Start; + unsigned long long Actual = 0; - memmove(Buffer,Start,EndSize); - Start = Buffer; - End = Buffer + EndSize; + memmove(d->Buffer,d->Start,EndSize); + d->Start = d->Buffer; + d->End = d->Buffer + EndSize; - if (Left == 0) + if (d->Done == false) { - if (EndSize <= 3) + // See if only a bit of the file is left + unsigned long long const dataSize = d->Size - ((d->End - d->Buffer) + 1); + if (d->Fd.Read(d->End, dataSize, &Actual) == false) return false; - if (Size - (End - Buffer) < 4) + if (Actual != dataSize || d->Fd.Eof() == true) + d->Done = true; + d->End += Actual; + } + + if (d->Done == true) + { + if (EndSize <= 3 && Actual == 0) + return false; + if (d->Size - (d->End - d->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--) + for (const char *E = d->End - 1; E - d->End < 6 && (*E == '\n' || *E == '\r'); E--) if (*E == '\n') LineCount++; - for (; LineCount < 2; LineCount++) - *End++ = '\n'; + if (LineCount < 2) + { + if ((unsigned)(d->End - d->Buffer) >= d->Size) + Resize(d->Size + 3); + for (; LineCount < 2; LineCount++) + *d->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; } /*}}}*/ @@ -121,53 +199,44 @@ bool pkgTagFile::Fill() // --------------------------------------------------------------------- /* This jumps to a pre-recorded file location and reads the record that is there */ -bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset) +bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset) { // We are within a buffer space of the next hit.. - if (Offset >= iOffset && iOffset + (End - Start) > Offset) + if (Offset >= d->iOffset && d->iOffset + (d->End - d->Start) > Offset) { - unsigned long Dist = Offset - iOffset; - Start += Dist; - iOffset += Dist; + unsigned long long Dist = Offset - d->iOffset; + d->Start += Dist; + d->iOffset += Dist; return Step(Tag); } // Reposition and reload.. - iOffset = Offset; - Left = TotalSize - Offset; - if (Fd.Seek(Offset) == false) + d->iOffset = Offset; + d->Done = false; + if (d->Fd.Seek(Offset) == false) return false; - End = Start = Buffer; + d->End = d->Start = d->Buffer; if (Fill() == false) return false; - if (Tag.Scan(Start,End - Start) == true) + if (Tag.Scan(d->Start, d->End - d->Start) == true) return true; // This appends a double new line (for the real eof handling) if (Fill() == false) return false; - if (Tag.Scan(Start,End - Start) == false) - return _error->Error(_("Unable to parse package file %s (2)"),Fd.Name().c_str()); + if (Tag.Scan(d->Start, d->End - d->Start) == false) + return _error->Error(_("Unable to parse package file %s (2)"),d->Fd.Name().c_str()); 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. This very simple hash function for the - first 3 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); - return Res & 0xFF; -} - +/* 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; @@ -176,10 +245,12 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength) if (Stop == 0) return false; - + TagCount = 0; - while (TagCount < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End) + 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) { @@ -191,14 +262,14 @@ 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++); + TrimRecord(false,End); return true; } @@ -208,6 +279,16 @@ 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. */ @@ -216,10 +297,17 @@ void pkgTagSection::Trim() for (; Stop > Section + 2 && (Stop[-2] == '\n' || Stop[-2] == '\r'); Stop--); } /*}}}*/ +// TagSection::Exists - return True if a tag exists /*{{{*/ +bool pkgTagSection::Exists(const char* const Tag) +{ + unsigned int tmp; + return Find(Tag, tmp); +} + /*}}}*/ // TagSection::Find - Locate a tag /*{{{*/ // --------------------------------------------------------------------- /* This searches the section for a tag that matches the given string. */ -bool pkgTagSection::Find(const char *Tag,unsigned &Pos) const +bool pkgTagSection::Find(const char *Tag,unsigned int &Pos) const { unsigned int Length = strlen(Tag); unsigned int I = AlphaIndexes[AlphaHash(Tag)]; @@ -326,6 +414,30 @@ signed int pkgTagSection::FindI(const char *Tag,signed long Default) const return Result; } /*}}}*/ +// TagSection::FindULL - Find an unsigned long long integer /*{{{*/ +// --------------------------------------------------------------------- +/* */ +unsigned long long pkgTagSection::FindULL(const char *Tag, unsigned long long const &Default) const +{ + const char *Start; + const char *Stop; + if (Find(Tag,Start,Stop) == false) + return Default; + + // Copy it into a temp buffer so we can use strtoull + char S[100]; + if ((unsigned)(Stop - Start) >= sizeof(S)) + return Default; + strncpy(S,Start,Stop-Start); + S[Stop - Start] = 0; + + char *End; + unsigned long long Result = strtoull(S,&End,10); + if (S == End) + return Default; + return Result; +} + /*}}}*/ // TagSection::FindFlag - Locate a yes/no type flag /*{{{*/ // --------------------------------------------------------------------- /* The bits marked in Flag are masked on/off in Flags */ @@ -336,9 +448,13 @@ bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags, const char *Stop; if (Find(Tag,Start,Stop) == false) return true; - - switch (StringToBool(string(Start,Stop))) - { + return FindFlag(Flags, Flag, Start, Stop); +} +bool const pkgTagSection::FindFlag(unsigned long &Flags, unsigned long Flag, + char const* Start, char const* Stop) +{ + switch (StringToBool(string(Start, Stop))) + { case 0: Flags &= ~Flag; return true; @@ -354,7 +470,6 @@ 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 @@ -371,6 +486,7 @@ static const char *iTFRewritePackageOrder[] = { "Section", "Installed-Size", "Maintainer", + "Original-Maintainer", "Architecture", "Source", "Version", @@ -383,10 +499,14 @@ static const char *iTFRewritePackageOrder[] = { "Recommends", "Suggests", "Conflicts", + "Breaks", "Conffiles", "Filename", "Size", "MD5Sum", + "SHA1", + "SHA256", + "SHA512", "MSDOS-Filename", // Obsolete "Description", 0}; @@ -397,6 +517,7 @@ static const char *iTFRewriteSourceOrder[] = {"Package", "Priority", "Section", "Maintainer", + "Original-Maintainer", "Build-Depends", "Build-Depends-Indep", "Build-Conflicts",