X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/e62aa1dd8099aeb8bb667253ca22c56b93f521d1..8710a36a01c0cb1648926792c2ad05185535558e:/apt-pkg/tagfile.cc?ds=inline diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc index 832a40d1e..52f4da2d5 100644 --- a/apt-pkg/tagfile.cc +++ b/apt-pkg/tagfile.cc @@ -21,6 +21,8 @@ #include #include #include +#include +#include #include /*}}}*/ @@ -45,16 +47,43 @@ public: unsigned long long Size; }; +static unsigned long AlphaHash(const char *Text, size_t Length) /*{{{*/ +{ + /* This very simple hash function for the last 8 letters gives + very good performance on the debian package files */ + if (Length > 8) + { + Text += (Length - 8); + Length = 8; + } + unsigned long Res = 0; + for (size_t i = 0; i < Length; ++i) + Res = ((unsigned long)(Text[i]) & 0xDF) ^ (Res << 1); + return Res & 0xFF; +} + /*}}}*/ + // TagFile::pkgTagFile - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long long Size) + : d(NULL) +{ + Init(pFd, Size); +} + +void pkgTagFile::Init(FileFd *pFd,unsigned long long Size) { /* 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; + if(d != NULL) + { + free(d->Buffer); + delete d; + } d = new pkgTagFilePrivate(pFd, Size); if (d->Fd.IsOpen() == false) @@ -83,7 +112,7 @@ pkgTagFile::~pkgTagFile() } /*}}}*/ // TagFile::Offset - Return the current offset in the buffer /*{{{*/ -unsigned long pkgTagFile::Offset() +APT_PURE unsigned long pkgTagFile::Offset() { return d->iOffset; } @@ -126,18 +155,23 @@ bool pkgTagFile::Resize(unsigned long long const newSize) */ bool pkgTagFile::Step(pkgTagSection &Tag) { - while (Tag.Scan(d->Start,d->End - d->Start) == false) + if(Tag.Scan(d->Start,d->End - d->Start) == false) { - if (Fill() == false) - return false; - - if(Tag.Scan(d->Start,d->End - d->Start)) - break; + do + { + if (Fill() == false) + return false; + + if(Tag.Scan(d->Start,d->End - d->Start, false)) + break; - if (Resize() == false) - return _error->Error(_("Unable to parse package file %s (1)"), - d->Fd.Name().c_str()); + if (Resize() == false) + return _error->Error(_("Unable to parse package file %s (1)"), + d->Fd.Name().c_str()); + + } while (Tag.Scan(d->Start,d->End - d->Start, false) == false); } + d->Start += Tag.size(); d->iOffset += Tag.size(); @@ -231,7 +265,7 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset) if (Fill() == false) return false; - if (Tag.Scan(d->Start, d->End - d->Start) == false) + if (Tag.Scan(d->Start, d->End - d->Start, false) == false) return _error->Error(_("Unable to parse package file %s (2)"),d->Fd.Name().c_str()); return true; @@ -241,27 +275,46 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset) // --------------------------------------------------------------------- /* */ pkgTagSection::pkgTagSection() - : Section(0), TagCount(0), d(NULL), Stop(0) + : Section(0), d(NULL), Stop(0) { - memset(&Indexes, 0, sizeof(Indexes)); - memset(&AlphaIndexes, 0, sizeof(AlphaIndexes)); + memset(&LookupTable, 0, sizeof(LookupTable)); } /*}}}*/ // 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) +bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength, bool const Restart) { + Section = Start; const char *End = Start + MaxLength; - Stop = Section = Start; - memset(AlphaIndexes,0,sizeof(AlphaIndexes)); + + if (Restart == false && Tags.empty() == false) + { + Stop = Section + Tags.back().StartTag; + if (End <= Stop) + return false; + Stop = (const char *)memchr(Stop,'\n',End - Stop); + if (Stop == NULL) + return false; + ++Stop; + } + else + { + Stop = Section; + if (Tags.empty() == false) + { + memset(&LookupTable, 0, sizeof(LookupTable)); + Tags.clear(); + } + Tags.reserve(0x100); + } + size_t TagCount = Tags.size(); if (Stop == 0) return false; - TagCount = 0; - while (TagCount+1 < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End) + TagData lastTagData(0); + lastTagData.EndTag = 0; + unsigned long lastTagHash = 0; + while (Stop < End) { TrimRecord(true,End); @@ -273,12 +326,39 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength) // Start a new index and add it to the hash if (isspace(Stop[0]) == 0) { - Indexes[TagCount++] = Stop - Section; - AlphaIndexes[AlphaHash(Stop,End)] = TagCount; + // store the last found tag + if (lastTagData.EndTag != 0) + { + if (LookupTable[lastTagHash] != 0) + lastTagData.NextInBucket = LookupTable[lastTagHash]; + LookupTable[lastTagHash] = TagCount; + Tags.push_back(lastTagData); + } + + ++TagCount; + lastTagData = TagData(Stop - Section); + // find the colon separating tag and value + char const * Colon = (char const *) memchr(Stop, ':', End - Stop); + if (Colon == NULL) + return false; + // find the end of the tag (which might or might not be the colon) + char const * EndTag = Colon; + --EndTag; + for (; EndTag > Stop && isspace(*EndTag) != 0; --EndTag) + ; + ++EndTag; + lastTagData.EndTag = EndTag - Section; + lastTagHash = AlphaHash(Stop, EndTag - Stop); + // find the beginning of the value + Stop = Colon + 1; + for (; isspace(*Stop) != 0; ++Stop); + if (Stop >= End) + return false; + lastTagData.StartValue = Stop - Section; } Stop = (const char *)memchr(Stop,'\n',End - Stop); - + if (Stop == 0) return false; @@ -289,7 +369,16 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength) // Double newline marks the end of the record if (Stop+1 < End && Stop[1] == '\n') { - Indexes[TagCount] = Stop - Section; + if (lastTagData.EndTag != 0) + { + if (LookupTable[lastTagHash] != 0) + lastTagData.NextInBucket = LookupTable[lastTagHash]; + LookupTable[lastTagHash] = TagCount; + Tags.push_back(lastTagData); + } + + TagData const td(Stop - Section); + Tags.push_back(td); TrimRecord(false,End); return true; } @@ -318,8 +407,8 @@ 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) +// TagSection::Exists - return True if a tag exists /*{{{*/ +bool pkgTagSection::Exists(const char* const Tag) const { unsigned int tmp; return Find(Tag, tmp); @@ -330,73 +419,43 @@ bool pkgTagSection::Exists(const char* const Tag) /* This searches the section for a tag that matches the given string. */ bool pkgTagSection::Find(const char *Tag,unsigned int &Pos) const { - unsigned int Length = strlen(Tag); - unsigned int I = AlphaIndexes[AlphaHash(Tag)]; - if (I == 0) + size_t const Length = strlen(Tag); + unsigned int Bucket = LookupTable[AlphaHash(Tag, Length)]; + if (Bucket == 0) return false; - I--; - - for (unsigned int Counter = 0; Counter != TagCount; Counter++, - I = (I+1)%TagCount) + + for (; Bucket != 0; Bucket = Tags[Bucket - 1].NextInBucket) { - const char *St; - St = Section + Indexes[I]; - if (strncasecmp(Tag,St,Length) != 0) + if ((Tags[Bucket - 1].EndTag - Tags[Bucket - 1].StartTag) != Length) continue; - // Make sure the colon is in the right place - const char *C = St + Length; - for (; isspace(*C) != 0; C++); - if (*C != ':') + char const * const St = Section + Tags[Bucket - 1].StartTag; + if (strncasecmp(Tag,St,Length) != 0) continue; - Pos = I; + + Pos = Bucket - 1; return true; } Pos = 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) const { - unsigned int Length = strlen(Tag); - unsigned int I = AlphaIndexes[AlphaHash(Tag)]; - if (I == 0) + unsigned int Pos; + if (Find(Tag, Pos) == false) return false; - I--; - - for (unsigned int Counter = 0; Counter != TagCount; Counter++, - I = (I+1)%TagCount) - { - const char *St; - St = Section + Indexes[I]; - if (strncasecmp(Tag,St,Length) != 0) - continue; - - // Make sure the colon is in the right place - const char *C = St + Length; - for (; isspace(*C) != 0; C++); - if (*C != ':') - continue; - // Strip off the gunk from the start end - Start = C; - End = Section + Indexes[I+1]; - if (Start >= End) - return _error->Error("Internal parsing error"); - - for (; (isspace(*Start) != 0 || *Start == ':') && Start < End; Start++); - for (; isspace(End[-1]) != 0 && End > Start; End--); - - return true; - } - - Start = End = 0; - return false; + Start = Section + Tags[Pos].StartValue; + // Strip off the gunk from the end + End = Section + Tags[Pos + 1].StartTag; + if (unlikely(Start > End)) + return _error->Error("Internal parsing error"); + + for (; isspace(End[-1]) != 0 && End > Start; --End); + + return true; } /*}}}*/ // TagSection::FindS - Find a string /*{{{*/ @@ -471,7 +530,7 @@ bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags, return true; return FindFlag(Flags, Flag, Start, Stop); } -bool const pkgTagSection::FindFlag(unsigned long &Flags, unsigned long Flag, +bool pkgTagSection::FindFlag(unsigned long &Flags, unsigned long Flag, char const* Start, char const* Stop) { switch (StringToBool(string(Start, Stop))) @@ -491,6 +550,13 @@ bool const pkgTagSection::FindFlag(unsigned long &Flags, unsigned long Flag, return true; } /*}}}*/ +APT_PURE unsigned int pkgTagSection::Count() const { /*{{{*/ + if (Tags.empty() == true) + return 0; + // the last element is just marking the end and isn't a real one + return Tags.size() - 1; +} + /*}}}*/ // TFRewrite - Rewrite a control record /*{{{*/ // --------------------------------------------------------------------- /* This writes the control record to stdout rewriting it as necessary. The