// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
-// $Id: tagfile.cc,v 1.12 1998/10/24 04:58:06 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
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
-#ifdef __GNUG__
-#pragma implementation "apt-pkg/tagfile.h"
-#endif
+#include<config.h>
#include <apt-pkg/tagfile.h>
#include <apt-pkg/error.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/fileutl.h>
#include <string>
#include <stdio.h>
+#include <ctype.h>
+
+#include <apti18n.h>
/*}}}*/
+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 &Fd,unsigned long Size) : Fd(Fd), Size(Size)
+pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long long Size)
{
- Buffer = new char[Size];
- Start = End = Buffer;
- Left = 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();
}
/*}}}*/
+// TagFile::~pkgTagFile - Destructor /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgTagFile::~pkgTagFile()
+{
+ 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)
- {
- cout << string(Start,End-Start) << endl;
- return _error->Error("Unable to parse package file");
- }
- }
- 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;
}
/*}}}*/
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;
- if (Left == 0)
+ memmove(d->Buffer,d->Start,EndSize);
+ d->Start = d->Buffer;
+ d->End = d->Buffer + EndSize;
+
+ if (d->Done == false)
{
- if (EndSize <= 1)
+ // 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;
- return true;
+ if (Actual != dataSize || d->Fd.Eof() == true)
+ d->Done = true;
+ d->End += Actual;
}
- memmove(Buffer,Start,EndSize);
- Start = Buffer;
- End = Buffer + EndSize;
-
- // See if only a bit of the file is left
- if (Left < Size - (End - Buffer))
+ if (d->Done == true)
{
- if (Fd.Read(End,Left) == false)
+ if (EndSize <= 3 && Actual == 0)
return false;
+ if (d->Size - (d->End - d->Buffer) < 4)
+ return true;
- End += Left;
- Left = 0;
- }
- else
- {
- if (Fd.Read(End,Size - (End - Buffer)) == false)
+ // 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)
{
- cout << "boink" << endl;
- return false;
+ if ((unsigned)(d->End - d->Buffer) >= d->Size)
+ Resize(d->Size + 3);
+ for (; LineCount < 2; LineCount++)
+ *d->End++ = '\n';
}
- Left -= Size - (End - Buffer);
- End = Buffer + Size;
- }
+ return true;
+ }
+
return true;
}
/*}}}*/
// TagFile::Jump - Jump to a pre-recorded location in the file /*{{{*/
// ---------------------------------------------------------------------
-/* This jumps to a pre-recorded file location and */
-bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset)
+/* This jumps to a pre-recorded file location and reads the record
+ that is there */
+bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset)
{
- iOffset = Offset;
- Left = Fd.Size() - Offset;
- if (Fd.Seek(Offset) == false)
+ // We are within a buffer space of the next hit..
+ if (Offset >= d->iOffset && d->iOffset + (d->End - d->Start) > Offset)
+ {
+ unsigned long long Dist = Offset - d->iOffset;
+ d->Start += Dist;
+ d->iOffset += Dist;
+ 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;
+
+ if (Fill() == false)
return false;
- End = Start = Buffer;
+
+ 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");
+ 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 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;
Stop = Section = Start;
-
+ memset(AlphaIndexes,0,sizeof(AlphaIndexes));
+
+ if (Stop == 0)
+ return false;
+
TagCount = 0;
- Indexes[TagCount++] = Stop - Section;
- Stop++;
- for (; Stop < End; Stop++)
+ while (TagCount+1 < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End)
{
- if (Stop[-1] != '\n')
- continue;
+ TrimRecord(true,End);
+
+ // Start a new index and add it to the hash
+ if (isspace(Stop[0]) == 0)
+ {
+ Indexes[TagCount++] = Stop - Section;
+ AlphaIndexes[AlphaHash(Stop,End)] = TagCount;
+ }
- // Skip line feeds
- for (; Stop[0] == '\r' && Stop < End; Stop++);
+ Stop = (const char *)memchr(Stop,'\n',End - Stop);
- if (Stop[0] == '\n')
+ if (Stop == 0)
+ return false;
+
+ for (; Stop+1 < End && Stop[1] == '\r'; Stop++);
+
+ // Double newline marks the end of the record
+ if (Stop+1 < End && Stop[1] == '\n')
{
- // Extra one at the end to simplify find
Indexes[TagCount] = Stop - Section;
- for (; (Stop[0] == '\n' || Stop[0] == '\r') && Stop < End; Stop++);
+ TrimRecord(false,End);
return true;
}
- if (isspace(Stop[0]) == 0)
- Indexes[TagCount++] = Stop - Section;
-
- // Just in case.
- if (TagCount > sizeof(Indexes)/sizeof(Indexes[0]))
- TagCount = sizeof(Indexes)/sizeof(Indexes[0]);
- }
+ 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(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,const char *&Start,
- const char *&End)
+bool pkgTagSection::Find(const char *Tag,unsigned int &Pos) const
{
unsigned int Length = strlen(Tag);
- for (unsigned int I = 0; I != TagCount; I++)
+ unsigned int I = AlphaIndexes[AlphaHash(Tag)];
+ if (I == 0)
+ return false;
+ I--;
+
+ for (unsigned int Counter = 0; Counter != TagCount; Counter++,
+ I = (I+1)%TagCount)
{
- if (strncasecmp(Tag,Section + Indexes[I],Length) != 0)
+ 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;
+ Pos = I;
+ 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)
+ 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 = Section + Length + Indexes[I];
+ 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;
}
/*}}}*/
+// TagSection::FindS - Find a string /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+string pkgTagSection::FindS(const char *Tag) const
+{
+ const char *Start;
+ const char *End;
+ if (Find(Tag,Start,End) == false)
+ return string();
+ return string(Start,End);
+}
+ /*}}}*/
+// TagSection::FindI - Find an integer /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+signed int pkgTagSection::FindI(const char *Tag,signed long 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 strtol
+ char S[300];
+ if ((unsigned)(Stop - Start) >= sizeof(S))
+ return Default;
+ strncpy(S,Start,Stop-Start);
+ S[Stop - Start] = 0;
+
+ char *End;
+ signed long Result = strtol(S,&End,10);
+ if (S == End)
+ return Default;
+ 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 */
+bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags,
+ unsigned long Flag) const
+{
+ const char *Start;
+ const char *Stop;
+ if (Find(Tag,Start,Stop) == false)
+ return true;
+ 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;
+
+ case 1:
+ Flags |= Flag;
+ return true;
+
+ default:
+ _error->Warning("Unknown flag value: %s",string(Start,Stop).c_str());
+ return true;
+ }
+ return true;
+}
+ /*}}}*/
+// TFRewrite - Rewrite a control record /*{{{*/
+// ---------------------------------------------------------------------
+/* This writes the control record to stdout rewriting it as necessary. The
+ override map item specificies the rewriting rules to follow. This also
+ takes the time to sort the feild list. */
+
+/* The order of this list is taken from dpkg source lib/parse.c the fieldinfos
+ array. */
+static const char *iTFRewritePackageOrder[] = {
+ "Package",
+ "Essential",
+ "Status",
+ "Priority",
+ "Section",
+ "Installed-Size",
+ "Maintainer",
+ "Original-Maintainer",
+ "Architecture",
+ "Source",
+ "Version",
+ "Revision", // Obsolete
+ "Config-Version", // Obsolete
+ "Replaces",
+ "Provides",
+ "Depends",
+ "Pre-Depends",
+ "Recommends",
+ "Suggests",
+ "Conflicts",
+ "Breaks",
+ "Conffiles",
+ "Filename",
+ "Size",
+ "MD5Sum",
+ "SHA1",
+ "SHA256",
+ "SHA512",
+ "MSDOS-Filename", // Obsolete
+ "Description",
+ 0};
+static const char *iTFRewriteSourceOrder[] = {"Package",
+ "Source",
+ "Binary",
+ "Version",
+ "Priority",
+ "Section",
+ "Maintainer",
+ "Original-Maintainer",
+ "Build-Depends",
+ "Build-Depends-Indep",
+ "Build-Conflicts",
+ "Build-Conflicts-Indep",
+ "Architecture",
+ "Standards-Version",
+ "Format",
+ "Directory",
+ "Files",
+ 0};
+
+/* Two levels of initialization are used because gcc will set the symbol
+ size of an array to the length of the array, causing dynamic relinking
+ errors. Doing this makes the symbol size constant */
+const char **TFRewritePackageOrder = iTFRewritePackageOrder;
+const char **TFRewriteSourceOrder = iTFRewriteSourceOrder;
+
+bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
+ TFRewriteData *Rewrite)
+{
+ unsigned char Visited[256]; // Bit 1 is Order, Bit 2 is Rewrite
+ for (unsigned I = 0; I != 256; I++)
+ Visited[I] = 0;
+
+ // Set new tag up as necessary.
+ for (unsigned int J = 0; Rewrite != 0 && Rewrite[J].Tag != 0; J++)
+ {
+ if (Rewrite[J].NewTag == 0)
+ Rewrite[J].NewTag = Rewrite[J].Tag;
+ }
+
+ // Write all all of the tags, in order.
+ for (unsigned int I = 0; Order[I] != 0; I++)
+ {
+ bool Rewritten = false;
+
+ // See if this is a field that needs to be rewritten
+ for (unsigned int J = 0; Rewrite != 0 && Rewrite[J].Tag != 0; J++)
+ {
+ if (strcasecmp(Rewrite[J].Tag,Order[I]) == 0)
+ {
+ Visited[J] |= 2;
+ if (Rewrite[J].Rewrite != 0 && Rewrite[J].Rewrite[0] != 0)
+ {
+ if (isspace(Rewrite[J].Rewrite[0]))
+ fprintf(Output,"%s:%s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+ else
+ fprintf(Output,"%s: %s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+ }
+
+ Rewritten = true;
+ break;
+ }
+ }
+
+ // See if it is in the fragment
+ unsigned Pos;
+ if (Tags.Find(Order[I],Pos) == false)
+ continue;
+ Visited[Pos] |= 1;
+
+ if (Rewritten == true)
+ continue;
+
+ /* Write out this element, taking a moment to rewrite the tag
+ in case of changes of case. */
+ const char *Start;
+ const char *Stop;
+ Tags.Get(Start,Stop,Pos);
+
+ if (fputs(Order[I],Output) < 0)
+ return _error->Errno("fputs","IO Error to output");
+ Start += strlen(Order[I]);
+ if (fwrite(Start,Stop - Start,1,Output) != 1)
+ return _error->Errno("fwrite","IO Error to output");
+ if (Stop[-1] != '\n')
+ fprintf(Output,"\n");
+ }
+
+ // Now write all the old tags that were missed.
+ for (unsigned int I = 0; I != Tags.Count(); I++)
+ {
+ if ((Visited[I] & 1) == 1)
+ continue;
+
+ const char *Start;
+ const char *Stop;
+ Tags.Get(Start,Stop,I);
+ const char *End = Start;
+ for (; End < Stop && *End != ':'; End++);
+
+ // See if this is a field that needs to be rewritten
+ bool Rewritten = false;
+ for (unsigned int J = 0; Rewrite != 0 && Rewrite[J].Tag != 0; J++)
+ {
+ if (stringcasecmp(Start,End,Rewrite[J].Tag) == 0)
+ {
+ Visited[J] |= 2;
+ if (Rewrite[J].Rewrite != 0 && Rewrite[J].Rewrite[0] != 0)
+ {
+ if (isspace(Rewrite[J].Rewrite[0]))
+ fprintf(Output,"%s:%s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+ else
+ fprintf(Output,"%s: %s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+ }
+
+ Rewritten = true;
+ break;
+ }
+ }
+
+ if (Rewritten == true)
+ continue;
+
+ // Write out this element
+ if (fwrite(Start,Stop - Start,1,Output) != 1)
+ return _error->Errno("fwrite","IO Error to output");
+ if (Stop[-1] != '\n')
+ fprintf(Output,"\n");
+ }
+
+ // Now write all the rewrites that were missed
+ for (unsigned int J = 0; Rewrite != 0 && Rewrite[J].Tag != 0; J++)
+ {
+ if ((Visited[J] & 2) == 2)
+ continue;
+
+ if (Rewrite[J].Rewrite != 0 && Rewrite[J].Rewrite[0] != 0)
+ {
+ if (isspace(Rewrite[J].Rewrite[0]))
+ fprintf(Output,"%s:%s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+ else
+ fprintf(Output,"%s: %s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+ }
+ }
+
+ return true;
+}
+ /*}}}*/
projects / apt.git / blobdiff