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-rw-r--r--apt-pkg/tagfile.cc1083
1 files changed, 1083 insertions, 0 deletions
diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
new file mode 100644
index 0000000..047f889
--- /dev/null
+++ b/apt-pkg/tagfile.cc
@@ -0,0 +1,1083 @@
+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ Fast scanner for RFC-822 type header information
+
+ This uses a rotating buffer to load the package information into.
+ The scanner runs over it and isolates and indexes a single section.
+
+ ##################################################################### */
+ /*}}}*/
+// Include Files /*{{{*/
+#include <config.h>
+
+#include <apt-pkg/error.h>
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/string_view.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/tagfile-keys.h>
+#include <apt-pkg/tagfile.h>
+
+#include <list>
+
+#include <string>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <apti18n.h>
+ /*}}}*/
+
+using std::string;
+using APT::StringView;
+
+class APT_HIDDEN pkgTagFilePrivate /*{{{*/
+{
+public:
+ void Reset(FileFd * const pFd, unsigned long long const pSize, pkgTagFile::Flags const pFlags)
+ {
+ if (Buffer != NULL)
+ free(Buffer);
+ Buffer = NULL;
+ Fd = pFd;
+ Flags = pFlags;
+ Start = NULL;
+ End = NULL;
+ Done = false;
+ iOffset = 0;
+ Size = pSize;
+ isCommentedLine = false;
+ chunks.clear();
+ }
+
+ pkgTagFilePrivate(FileFd * const pFd, unsigned long long const Size, pkgTagFile::Flags const pFlags) : Buffer(NULL)
+ {
+ Reset(pFd, Size, pFlags);
+ }
+ FileFd * Fd;
+ pkgTagFile::Flags Flags;
+ char *Buffer;
+ char *Start;
+ char *End;
+ bool Done;
+ unsigned long long iOffset;
+ unsigned long long Size;
+ bool isCommentedLine;
+ struct FileChunk
+ {
+ bool const good;
+ size_t length;
+ FileChunk(bool const pgood, size_t const plength) noexcept : good(pgood), length(plength) {}
+ };
+ std::list<FileChunk> chunks;
+
+ ~pkgTagFilePrivate()
+ {
+ if (Buffer != NULL)
+ free(Buffer);
+ }
+};
+ /*}}}*/
+class APT_HIDDEN pkgTagSectionPrivate /*{{{*/
+{
+public:
+ pkgTagSectionPrivate()
+ {
+ }
+ struct TagData {
+ unsigned int StartTag;
+ unsigned int EndTag;
+ unsigned int StartValue;
+ unsigned int NextInBucket;
+
+ explicit TagData(unsigned int const StartTag) : StartTag(StartTag), EndTag(0), StartValue(0), NextInBucket(0) {}
+ };
+ std::vector<TagData> Tags;
+};
+ /*}}}*/
+
+static unsigned long BetaHash(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 & 0x7F;
+}
+ /*}}}*/
+
+// TagFile::pkgTagFile - Constructor /*{{{*/
+pkgTagFile::pkgTagFile(FileFd * const pFd,pkgTagFile::Flags const pFlags, unsigned long long const Size)
+ : d(new pkgTagFilePrivate(pFd, Size + 4, pFlags))
+{
+ Init(pFd, pFlags, Size);
+}
+pkgTagFile::pkgTagFile(FileFd * const pFd,unsigned long long const Size)
+ : pkgTagFile(pFd, pkgTagFile::STRICT, Size)
+{
+}
+void pkgTagFile::Init(FileFd * const pFd, pkgTagFile::Flags const pFlags, 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;
+ d->Reset(pFd, Size, pFlags);
+
+ if (d->Fd->IsOpen() == false)
+ d->Start = d->End = d->Buffer = 0;
+ else
+ d->Buffer = (char*)malloc(sizeof(char) * Size);
+
+ if (d->Buffer == NULL)
+ d->Done = true;
+ else
+ d->Done = false;
+
+ d->Start = d->End = d->Buffer;
+ d->iOffset = 0;
+ if (d->Done == false)
+ Fill();
+}
+void pkgTagFile::Init(FileFd * const pFd,unsigned long long Size)
+{
+ Init(pFd, pkgTagFile::STRICT, Size);
+}
+ /*}}}*/
+// TagFile::~pkgTagFile - Destructor /*{{{*/
+pkgTagFile::~pkgTagFile()
+{
+ delete d;
+}
+ /*}}}*/
+// TagFile::Offset - Return the current offset in the buffer /*{{{*/
+APT_PURE 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;
+
+ // get new buffer and use it
+ char* const newBuffer = static_cast<char*>(realloc(d->Buffer, sizeof(char) * newSize));
+ if (newBuffer == NULL)
+ return false;
+ d->Buffer = newBuffer;
+ d->Size = newSize;
+
+ // 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 that fails too, double the buffer size and try again until a
+ * maximum buffer is reached.
+ */
+bool pkgTagFile::Step(pkgTagSection &Tag)
+{
+ if(Tag.Scan(d->Start,d->End - d->Start) == false)
+ {
+ 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 (%d)"),
+ d->Fd->Name().c_str(), 1);
+
+ } while (Tag.Scan(d->Start,d->End - d->Start, false) == false);
+ }
+
+ size_t tagSize = Tag.size();
+ d->Start += tagSize;
+
+ if ((d->Flags & pkgTagFile::SUPPORT_COMMENTS) == 0)
+ d->iOffset += tagSize;
+ else
+ {
+ auto first = d->chunks.begin();
+ for (; first != d->chunks.end(); ++first)
+ {
+ if (first->good == false)
+ d->iOffset += first->length;
+ else
+ {
+ if (tagSize < first->length)
+ {
+ first->length -= tagSize;
+ d->iOffset += tagSize;
+ break;
+ }
+ else
+ {
+ tagSize -= first->length;
+ d->iOffset += first->length;
+ }
+ }
+ }
+ d->chunks.erase(d->chunks.begin(), first);
+ }
+
+ if ((d->Flags & pkgTagFile::SUPPORT_COMMENTS) == 0 || Tag.Count() != 0)
+ {
+ Tag.Trim();
+ return true;
+ }
+ return Step(Tag);
+}
+ /*}}}*/
+// 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 */
+static bool FillBuffer(pkgTagFilePrivate * const d)
+{
+ unsigned long long Actual = 0;
+ // 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 (Actual != dataSize)
+ d->Done = true;
+ d->End += Actual;
+ return true;
+}
+static void RemoveCommentsFromBuffer(pkgTagFilePrivate * const d)
+{
+ // look for valid comments in the buffer
+ char * good_start = nullptr, * bad_start = nullptr;
+ char * current = d->Start;
+ if (d->isCommentedLine == false)
+ {
+ if (d->Start == d->Buffer)
+ {
+ // the start of the buffer is a newline as a record can't start
+ // in the middle of a line by definition.
+ if (*d->Start == '#')
+ {
+ d->isCommentedLine = true;
+ ++current;
+ if (current > d->End)
+ d->chunks.emplace_back(false, 1);
+ }
+ }
+ if (d->isCommentedLine == false)
+ good_start = d->Start;
+ else
+ bad_start = d->Start;
+ }
+ else
+ bad_start = d->Start;
+
+ std::vector<std::pair<char*, size_t>> good_parts;
+ while (current <= d->End)
+ {
+ size_t const restLength = (d->End - current);
+ if (d->isCommentedLine == false)
+ {
+ current = static_cast<char*>(memchr(current, '#', restLength));
+ if (current == nullptr)
+ {
+ size_t const goodLength = d->End - good_start;
+ d->chunks.emplace_back(true, goodLength);
+ if (good_start != d->Start)
+ good_parts.push_back(std::make_pair(good_start, goodLength));
+ break;
+ }
+ bad_start = current;
+ --current;
+ // ensure that this is really a comment and not a '#' in the middle of a line
+ if (*current == '\n')
+ {
+ size_t const goodLength = (current - good_start) + 1;
+ d->chunks.emplace_back(true, goodLength);
+ good_parts.push_back(std::make_pair(good_start, goodLength));
+ good_start = nullptr;
+ d->isCommentedLine = true;
+ }
+ current += 2;
+ }
+ else // the current line is a comment
+ {
+ current = static_cast<char*>(memchr(current, '\n', restLength));
+ if (current == nullptr)
+ {
+ d->chunks.emplace_back(false, (d->End - bad_start));
+ break;
+ }
+ ++current;
+ // is the next line a comment, too?
+ if (current >= d->End || *current != '#')
+ {
+ d->chunks.emplace_back(false, (current - bad_start));
+ good_start = current;
+ bad_start = nullptr;
+ d->isCommentedLine = false;
+ }
+ ++current;
+ }
+ }
+
+ if (good_parts.empty() == false)
+ {
+ // we found comments, so move later parts over them
+ current = d->Start;
+ for (auto const &good: good_parts)
+ {
+ memmove(current, good.first, good.second);
+ current += good.second;
+ }
+ d->End = current;
+ }
+
+ if (d->isCommentedLine == true)
+ {
+ // deal with a buffer containing only comments
+ // or an (unfinished) comment at the end
+ if (good_parts.empty() == true)
+ d->End = d->Start;
+ else
+ d->Start = d->End;
+ }
+ else
+ {
+ // the buffer was all comment, but ended with the buffer
+ if (good_parts.empty() == true && good_start >= d->End)
+ d->End = d->Start;
+ else
+ d->Start = d->End;
+ }
+}
+bool pkgTagFile::Fill()
+{
+ unsigned long long const EndSize = d->End - d->Start;
+ if (EndSize != 0)
+ {
+ memmove(d->Buffer,d->Start,EndSize);
+ d->Start = d->End = d->Buffer + EndSize;
+ }
+ else
+ d->Start = d->End = d->Buffer;
+
+ unsigned long long Actual = 0;
+ while (d->Done == false && d->Size > (Actual + 1))
+ {
+ if (FillBuffer(d) == false)
+ return false;
+ if ((d->Flags & pkgTagFile::SUPPORT_COMMENTS) != 0)
+ RemoveCommentsFromBuffer(d);
+ Actual = d->End - d->Buffer;
+ }
+ d->Start = d->Buffer;
+
+ 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 = d->End - 1; E - d->End < 6 && (*E == '\n' || *E == '\r'); E--)
+ if (*E == '\n')
+ ++LineCount;
+ if (LineCount < 2)
+ {
+ if (static_cast<unsigned long long>(d->End - d->Buffer) >= d->Size)
+ Resize(d->Size + 3);
+ for (; LineCount < 2; ++LineCount)
+ *d->End++ = '\n';
+ }
+ }
+ return true;
+}
+ /*}}}*/
+// TagFile::Jump - Jump to a pre-recorded location in the file /*{{{*/
+// ---------------------------------------------------------------------
+/* This jumps to a pre-recorded file location and reads the record
+ that is there */
+bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset)
+{
+ if ((d->Flags & pkgTagFile::SUPPORT_COMMENTS) == 0 &&
+ // We are within a buffer space of the next hit..
+ Offset >= d->iOffset && d->iOffset + (d->End - d->Start) > Offset)
+ {
+ unsigned long long Dist = Offset - d->iOffset;
+ d->Start += Dist;
+ d->iOffset += Dist;
+ // if we have seen the end, don't ask for more
+ if (d->Done == true)
+ return Tag.Scan(d->Start, d->End - d->Start);
+ else
+ return Step(Tag);
+ }
+
+ // Reposition and reload..
+ d->iOffset = Offset;
+ d->Done = false;
+ if (d->Fd->Seek(Offset) == false)
+ return false;
+ d->End = d->Start = d->Buffer;
+ d->isCommentedLine = false;
+ d->chunks.clear();
+
+ if (Fill() == false)
+ return false;
+
+ 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(d->Start, d->End - d->Start, false) == false)
+ return _error->Error(_("Unable to parse package file %s (%d)"),d->Fd->Name().c_str(), 2);
+
+ return true;
+}
+ /*}}}*/
+// pkgTagSection::pkgTagSection - Constructor /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgTagSection::pkgTagSection()
+ : Section(0), d(new pkgTagSectionPrivate()), Stop(0)
+{
+ memset(&AlphaIndexes, 0, sizeof(AlphaIndexes));
+ memset(&BetaIndexes, 0, sizeof(BetaIndexes));
+}
+ /*}}}*/
+// TagSection::Scan - Scan for the end of the header information /*{{{*/
+bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength, bool const Restart)
+{
+ Section = Start;
+ const char *End = Start + MaxLength;
+
+ if (Restart == false && d->Tags.empty() == false)
+ {
+ Stop = Section + d->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 (d->Tags.empty() == false)
+ {
+ memset(&AlphaIndexes, 0, sizeof(AlphaIndexes));
+ memset(&BetaIndexes, 0, sizeof(BetaIndexes));
+ d->Tags.clear();
+ }
+ d->Tags.reserve(0x100);
+ }
+ unsigned int TagCount = d->Tags.size();
+
+ if (Stop == 0)
+ return false;
+
+ pkgTagSectionPrivate::TagData lastTagData(0);
+ Key lastTagKey = Key::Unknown;
+ unsigned int lastTagHash = 0;
+ while (Stop < End)
+ {
+ TrimRecord(true,End);
+
+ // this can happen when TrimRecord trims away the entire Record
+ // (e.g. because it just contains comments)
+ if(Stop == End)
+ return true;
+
+ // Start a new index and add it to the hash
+ if (isspace_ascii(Stop[0]) == 0)
+ {
+ // store the last found tag
+ if (lastTagData.StartValue != 0)
+ {
+ if (lastTagKey != Key::Unknown) {
+ AlphaIndexes[static_cast<size_t>(lastTagKey)] = TagCount;
+ } else {
+ if (BetaIndexes[lastTagHash] != 0)
+ lastTagData.NextInBucket = BetaIndexes[lastTagHash];
+ BetaIndexes[lastTagHash] = TagCount;
+ }
+ d->Tags.push_back(lastTagData);
+ }
+
+ ++TagCount;
+ lastTagData = pkgTagSectionPrivate::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_ascii(*EndTag) != 0; --EndTag)
+ ;
+ ++EndTag;
+ lastTagData.EndTag = EndTag - Section;
+ lastTagKey = pkgTagHash(Stop, EndTag - Stop);
+ if (lastTagKey == Key::Unknown)
+ lastTagHash = BetaHash(Stop, EndTag - Stop);
+ // find the beginning of the value
+ Stop = Colon + 1;
+ for (; Stop < End && isspace_ascii(*Stop) != 0; ++Stop)
+ if (*Stop == '\n' && Stop[1] != ' ')
+ break;
+ if (Stop >= End)
+ return false;
+ lastTagData.StartValue = Stop - Section;
+ }
+
+ Stop = (const char *)memchr(Stop,'\n',End - Stop);
+
+ if (Stop == 0)
+ return false;
+
+ for (; Stop+1 < End && Stop[1] == '\r'; Stop++)
+ /* nothing */
+ ;
+
+ // Double newline marks the end of the record
+ if (Stop+1 < End && Stop[1] == '\n')
+ {
+ if (lastTagData.StartValue != 0)
+ {
+ if (lastTagKey != Key::Unknown) {
+ AlphaIndexes[static_cast<size_t>(lastTagKey)] = TagCount;
+ } else {
+ if (BetaIndexes[lastTagHash] != 0)
+ lastTagData.NextInBucket = BetaIndexes[lastTagHash];
+ BetaIndexes[lastTagHash] = TagCount;
+ }
+ d->Tags.push_back(lastTagData);
+ }
+
+ pkgTagSectionPrivate::TagData const td(Stop - Section);
+ d->Tags.push_back(td);
+ TrimRecord(false,End);
+ return true;
+ }
+
+ Stop++;
+ }
+
+ 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. */
+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(StringView Tag) const
+{
+ unsigned int tmp;
+ return Find(Tag, tmp);
+}
+bool pkgTagSection::Exists(Key key) const
+{
+ unsigned int tmp;
+ return Find(key, tmp);
+}
+ /*}}}*/
+// TagSection::Find - Locate a tag /*{{{*/
+// ---------------------------------------------------------------------
+/* This searches the section for a tag that matches the given string. */
+bool pkgTagSection::Find(Key key,unsigned int &Pos) const
+{
+ auto Bucket = AlphaIndexes[static_cast<size_t>(key)];
+ Pos = Bucket - 1;
+ return Bucket != 0;
+}
+bool pkgTagSection::Find(StringView TagView,unsigned int &Pos) const
+{
+ const char * const Tag = TagView.data();
+ size_t const Length = TagView.length();
+ auto key = pkgTagHash(Tag, Length);
+ if (key != Key::Unknown)
+ return Find(key, Pos);
+
+ unsigned int Bucket = BetaIndexes[BetaHash(Tag, Length)];
+ if (Bucket == 0)
+ return false;
+
+ for (; Bucket != 0; Bucket = d->Tags[Bucket - 1].NextInBucket)
+ {
+ if ((d->Tags[Bucket - 1].EndTag - d->Tags[Bucket - 1].StartTag) != Length)
+ continue;
+
+ char const * const St = Section + d->Tags[Bucket - 1].StartTag;
+ if (strncasecmp(Tag,St,Length) != 0)
+ continue;
+
+ Pos = Bucket - 1;
+ return true;
+ }
+
+ Pos = 0;
+ return false;
+}
+
+bool pkgTagSection::FindInternal(unsigned int Pos, const char *&Start,
+ const char *&End) const
+{
+ if (unlikely(Pos + 1 >= d->Tags.size() || Pos >= d->Tags.size()))
+ return _error->Error("Internal parsing error");
+
+ Start = Section + d->Tags[Pos].StartValue;
+ // Strip off the gunk from the end
+ End = Section + d->Tags[Pos + 1].StartTag;
+ if (unlikely(Start > End))
+ return _error->Error("Internal parsing error");
+
+ for (; isspace_ascii(End[-1]) != 0 && End > Start; --End);
+
+ return true;
+}
+bool pkgTagSection::Find(StringView Tag,const char *&Start,
+ const char *&End) const
+{
+ unsigned int Pos;
+ return Find(Tag, Pos) && FindInternal(Pos, Start, End);
+}
+bool pkgTagSection::Find(Key key,const char *&Start,
+ const char *&End) const
+{
+ unsigned int Pos;
+ return Find(key, Pos) && FindInternal(Pos, Start, End);
+}
+ /*}}}*/
+// TagSection::FindS - Find a string /*{{{*/
+StringView pkgTagSection::Find(StringView Tag) const
+{
+ const char *Start;
+ const char *End;
+ if (Find(Tag,Start,End) == false)
+ return StringView();
+ return StringView(Start, End - Start);
+}
+StringView pkgTagSection::Find(Key key) const
+{
+ const char *Start;
+ const char *End;
+ if (Find(key,Start,End) == false)
+ return StringView();
+ return StringView(Start, End - Start);
+}
+ /*}}}*/
+// TagSection::FindRawS - Find a string /*{{{*/
+StringView pkgTagSection::FindRawInternal(unsigned int Pos) const
+{
+ if (unlikely(Pos + 1 >= d->Tags.size() || Pos >= d->Tags.size()))
+ return _error->Error("Internal parsing error"), "";
+
+ char const *Start = (char const *) memchr(Section + d->Tags[Pos].EndTag, ':', d->Tags[Pos].StartValue - d->Tags[Pos].EndTag);
+ char const *End = Section + d->Tags[Pos + 1].StartTag;
+
+ if (Start == nullptr)
+ return "";
+
+ ++Start;
+
+ if (unlikely(Start > End))
+ return "";
+
+ for (; isspace_ascii(End[-1]) != 0 && End > Start; --End);
+
+ return StringView(Start, End - Start);
+}
+StringView pkgTagSection::FindRaw(StringView Tag) const
+{
+ unsigned int Pos;
+ return Find(Tag, Pos) ? FindRawInternal(Pos) : "";
+}
+StringView pkgTagSection::FindRaw(Key key) const
+{
+ unsigned int Pos;
+ return Find(key, Pos) ? FindRawInternal(Pos) : "";
+}
+ /*}}}*/
+// TagSection::FindI - Find an integer /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+signed int pkgTagSection::FindIInternal(unsigned int Pos,signed long Default) const
+{
+ const char *Start;
+ const char *Stop;
+ if (FindInternal(Pos,Start,Stop) == false)
+ return Default;
+
+ // Copy it into a temp buffer so we can use strtol
+ char S[300];
+ if ((unsigned)(Stop - Start) >= sizeof(S))
+ return Default;
+ strncpy(S,Start,Stop-Start);
+ S[Stop - Start] = 0;
+
+ errno = 0;
+ char *End;
+ signed long Result = strtol(S,&End,10);
+ if (errno == ERANGE ||
+ Result < std::numeric_limits<int>::min() || Result > std::numeric_limits<int>::max()) {
+ errno = ERANGE;
+ _error->Error(_("Cannot convert %s to integer: out of range"), S);
+ }
+ if (S == End)
+ return Default;
+ return Result;
+}
+signed int pkgTagSection::FindI(Key key,signed long Default) const
+{
+ unsigned int Pos;
+
+ return Find(key, Pos) ? FindIInternal(Pos) : Default;
+}
+signed int pkgTagSection::FindI(StringView Tag,signed long Default) const
+{
+ unsigned int Pos;
+
+ return Find(Tag, Pos) ? FindIInternal(Pos, Default) : Default;
+}
+ /*}}}*/
+// TagSection::FindULL - Find an unsigned long long integer /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+unsigned long long pkgTagSection::FindULLInternal(unsigned int Pos, unsigned long long const &Default) const
+{
+ const char *Start;
+ const char *Stop;
+ if (FindInternal(Pos,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;
+}
+unsigned long long pkgTagSection::FindULL(Key key, unsigned long long const &Default) const
+{
+ unsigned int Pos;
+
+ return Find(key, Pos) ? FindULLInternal(Pos, Default) : Default;
+}
+unsigned long long pkgTagSection::FindULL(StringView Tag, unsigned long long const &Default) const
+{
+ unsigned int Pos;
+
+ return Find(Tag, Pos) ? FindULLInternal(Pos, Default) : Default;
+}
+ /*}}}*/
+// TagSection::FindB - Find boolean value /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgTagSection::FindBInternal(unsigned int Pos, bool Default) const
+{
+ const char *Start, *Stop;
+ if (FindInternal(Pos, Start, Stop) == false)
+ return Default;
+ return StringToBool(string(Start, Stop));
+}
+bool pkgTagSection::FindB(Key key, bool Default) const
+{
+ unsigned int Pos;
+ return Find(key, Pos) ? FindBInternal(Pos, Default): Default;
+}
+bool pkgTagSection::FindB(StringView Tag, bool Default) const
+{
+ unsigned int Pos;
+ return Find(Tag, Pos) ? FindBInternal(Pos, Default) : Default;
+}
+ /*}}}*/
+// TagSection::FindFlag - Locate a yes/no type flag /*{{{*/
+// ---------------------------------------------------------------------
+/* The bits marked in Flag are masked on/off in Flags */
+bool pkgTagSection::FindFlagInternal(unsigned int Pos, uint8_t &Flags,
+ uint8_t const Flag) const
+{
+ const char *Start;
+ const char *Stop;
+ if (FindInternal(Pos,Start,Stop) == false)
+ return true;
+ return FindFlag(Flags, Flag, Start, Stop);
+}
+bool pkgTagSection::FindFlag(Key key, uint8_t &Flags,
+ uint8_t const Flag) const
+{
+ unsigned int Pos;
+ if (Find(key,Pos) == false)
+ return true;
+ return FindFlagInternal(Pos, Flags, Flag);
+}
+bool pkgTagSection::FindFlag(StringView Tag, uint8_t &Flags,
+ uint8_t const Flag) const
+{
+ unsigned int Pos;
+ if (Find(Tag,Pos) == false)
+ return true;
+ return FindFlagInternal(Pos, Flags, Flag);
+}
+bool pkgTagSection::FindFlag(uint8_t &Flags, uint8_t const Flag,
+ char const* const Start, char const* const Stop)
+{
+ switch (StringToBool(string(Start, Stop)))
+ {
+ case 0:
+ Flags &= ~Flag;
+ return true;
+
+ case 1:
+ Flags |= Flag;
+ return true;
+
+ default:
+ _error->Warning("Unknown flag value: %s",string(Start,Stop).c_str());
+ return true;
+ }
+ return true;
+}
+bool pkgTagSection::FindFlagInternal(unsigned int Pos,unsigned long &Flags,
+ unsigned long Flag) const
+{
+ const char *Start;
+ const char *Stop;
+ if (FindInternal(Pos,Start,Stop) == false)
+ return true;
+ return FindFlag(Flags, Flag, Start, Stop);
+}
+bool pkgTagSection::FindFlag(Key key,unsigned long &Flags,
+ unsigned long Flag) const
+{
+ unsigned int Pos;
+ return Find(key, Pos) ? FindFlagInternal(Pos, Flags, Flag) : true;
+}
+bool pkgTagSection::FindFlag(StringView Tag,unsigned long &Flags,
+ unsigned long Flag) const
+{
+ unsigned int Pos;
+ return Find(Tag, Pos) ? FindFlagInternal(Pos, Flags, Flag) : true;
+}
+bool 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;
+
+ case 1:
+ Flags |= Flag;
+ return true;
+
+ default:
+ _error->Warning("Unknown flag value: %s",string(Start,Stop).c_str());
+ return true;
+ }
+ return true;
+}
+ /*}}}*/
+void pkgTagSection::Get(const char *&Start,const char *&Stop,unsigned int I) const/*{{{*/
+{
+ if (unlikely(I + 1 >= d->Tags.size() || I >= d->Tags.size()))
+ abort();
+ Start = Section + d->Tags[I].StartTag;
+ Stop = Section + d->Tags[I+1].StartTag;
+}
+ /*}}}*/
+APT_PURE unsigned int pkgTagSection::Count() const { /*{{{*/
+ if (d->Tags.empty() == true)
+ return 0;
+ // the last element is just marking the end and isn't a real one
+ return d->Tags.size() - 1;
+}
+ /*}}}*/
+// TagSection::Write - Ordered (re)writing of fields /*{{{*/
+pkgTagSection::Tag pkgTagSection::Tag::Remove(std::string const &Name)
+{
+ return Tag(REMOVE, Name, "");
+}
+pkgTagSection::Tag pkgTagSection::Tag::Rename(std::string const &OldName, std::string const &NewName)
+{
+ return Tag(RENAME, OldName, NewName);
+}
+pkgTagSection::Tag pkgTagSection::Tag::Rewrite(std::string const &Name, std::string const &Data)
+{
+ if (Data.empty() == true)
+ return Tag(REMOVE, Name, "");
+ else
+ return Tag(REWRITE, Name, Data);
+}
+static bool WriteTag(FileFd &File, std::string Tag, StringView Value)
+{
+ if (Value.empty() || isspace_ascii(Value[0]) != 0)
+ Tag.append(":");
+ else
+ Tag.append(": ");
+ Tag.append(Value.data(), Value.length());
+ Tag.append("\n");
+ return File.Write(Tag.c_str(), Tag.length());
+}
+static bool RewriteTags(FileFd &File, pkgTagSection const * const This, char const * const Tag,
+ std::vector<pkgTagSection::Tag>::const_iterator &R,
+ std::vector<pkgTagSection::Tag>::const_iterator const &REnd)
+{
+ size_t const TagLen = strlen(Tag);
+ for (; R != REnd; ++R)
+ {
+ std::string data;
+ if (R->Name.length() == TagLen && strncasecmp(R->Name.c_str(), Tag, R->Name.length()) == 0)
+ {
+ if (R->Action != pkgTagSection::Tag::REWRITE)
+ break;
+ data = R->Data;
+ }
+ else if(R->Action == pkgTagSection::Tag::RENAME && R->Data.length() == TagLen &&
+ strncasecmp(R->Data.c_str(), Tag, R->Data.length()) == 0)
+ data = This->FindRaw(R->Name.c_str()).to_string();
+ else
+ continue;
+
+ return WriteTag(File, Tag, data);
+ }
+ return true;
+}
+bool pkgTagSection::Write(FileFd &File, char const * const * const Order, std::vector<Tag> const &Rewrite) const
+{
+ // first pass: Write everything we have an order for
+ if (Order != NULL)
+ {
+ for (unsigned int I = 0; Order[I] != 0; ++I)
+ {
+ std::vector<Tag>::const_iterator R = Rewrite.begin();
+ if (RewriteTags(File, this, Order[I], R, Rewrite.end()) == false)
+ return false;
+ if (R != Rewrite.end())
+ continue;
+
+ if (Exists(Order[I]) == false)
+ continue;
+
+ if (WriteTag(File, Order[I], FindRaw(Order[I])) == false)
+ return false;
+ }
+ }
+ // second pass: See if we have tags which aren't ordered
+ if (d->Tags.empty() == false)
+ {
+ for (std::vector<pkgTagSectionPrivate::TagData>::const_iterator T = d->Tags.begin(); T != d->Tags.end() - 1; ++T)
+ {
+ char const * const fieldname = Section + T->StartTag;
+ size_t fieldnamelen = T->EndTag - T->StartTag;
+ if (Order != NULL)
+ {
+ unsigned int I = 0;
+ for (; Order[I] != 0; ++I)
+ {
+ if (fieldnamelen == strlen(Order[I]) && strncasecmp(fieldname, Order[I], fieldnamelen) == 0)
+ break;
+ }
+ if (Order[I] != 0)
+ continue;
+ }
+
+ std::string const name(fieldname, fieldnamelen);
+ std::vector<Tag>::const_iterator R = Rewrite.begin();
+ if (RewriteTags(File, this, name.c_str(), R, Rewrite.end()) == false)
+ return false;
+ if (R != Rewrite.end())
+ continue;
+
+ if (WriteTag(File, name, FindRaw(name)) == false)
+ return false;
+ }
+ }
+ // last pass: see if there are any rewrites remaining we haven't done yet
+ for (std::vector<Tag>::const_iterator R = Rewrite.begin(); R != Rewrite.end(); ++R)
+ {
+ if (R->Action == Tag::REMOVE)
+ continue;
+ auto const name = ((R->Action == Tag::RENAME) ? R->Data : R->Name);
+ if (Exists(name))
+ continue;
+ if (Order != NULL)
+ {
+ unsigned int I = 0;
+ for (; Order[I] != 0; ++I)
+ {
+ if (strncasecmp(name.c_str(), Order[I], name.length()) == 0 && name.length() == strlen(Order[I]))
+ break;
+ }
+ if (Order[I] != 0)
+ continue;
+ }
+
+ if (WriteTag(File, name, ((R->Action == Tag::RENAME) ? FindRaw(R->Name) : R->Data)) == false)
+ return false;
+ }
+ return true;
+}
+ /*}}}*/
+
+#include "tagfile-order.c"
+
+pkgTagSection::~pkgTagSection() { delete d; }
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-04 11:30:13 +0000