##################################################################### */
/*}}}*/
// Include Files /*{{{*/
-#ifdef __GNUG__
-#pragma implementation "apt-pkg/tagfile.h"
-#endif
-
#include <apt-pkg/tagfile.h>
#include <apt-pkg/error.h>
#include <apt-pkg/strutl.h>
/* */
pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) :
Fd(*pFd),
- Size(Size),
- Map(NULL),
- Buffer(0)
+ Size(Size)
{
if (Fd.IsOpen() == false)
{
+ Buffer = 0;
Start = End = Buffer = 0;
Done = true;
iOffset = 0;
- Map = NULL;
return;
}
- // check if we can MMap it
- if(Fd.Size() == 0)
- {
- Buffer = new char[Size];
- Start = End = Buffer;
- Done = false;
- Fill();
- } else {
- Map = new MMap (Fd, MMap::Public | MMap::ReadOnly);
- Buffer = (char *) Map->Data ();
- Start = Buffer;
- End = Buffer + Map->Size ();
- }
+ Buffer = new char[Size];
+ Start = End = Buffer;
+ Done = false;
iOffset = 0;
+ Fill();
}
/*}}}*/
// TagFile::~pkgTagFile - Destructor /*{{{*/
/* */
pkgTagFile::~pkgTagFile()
{
- if(!Map) delete [] Buffer;
- delete Map;
+ delete [] Buffer;
}
/*}}}*/
-// TagFile::Step - Advance to the next section /*{{{*/
+// TagFile::Resize - Resize the internal buffer /*{{{*/
// ---------------------------------------------------------------------
-/* If the Section Scanner fails we refill the buffer and try again. */
-bool pkgTagFile::Step(pkgTagSection &Tag)
+/* Resize the internal buffer (double it in size). Fail if a maximum size
+ * size is reached.
+ */
+bool pkgTagFile::Resize()
{
- if ((Map != NULL) && (Start == End))
+ char *tmp;
+ unsigned long EndSize = End - Start;
+
+ // fail is the buffer grows too big
+ if(Size > 1024*1024+1)
return false;
- if (Tag.Scan(Start,End - Start) == false)
- {
- if (Map != NULL)
- return _error->Error(_("Unable to parse package file %s (1)"),
- Fd.Name().c_str());
+ // 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 that fails too, double the buffer size and try again until a
+ * maximum buffer is reached.
+ */
+bool pkgTagFile::Step(pkgTagSection &Tag)
+{
+ 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();
return Step(Tag);
}
+ // Reposition and reload..
iOffset = Offset;
- if (Map != NULL)
- {
- Start = Buffer + iOffset;
- }
- else
- {
- // Reposition and reload..
- Done = false;
- if (Fd.Seek(Offset) == false)
- return false;
- End = Start = Buffer;
+ Done = false;
+ if (Fd.Seek(Offset) == false)
+ return false;
+ End = Start = Buffer;
- if (Fill() == false)
- return false;
+ if (Fill() == false)
+ return false;
- if (Tag.Scan(Start,End - Start) == true)
- return true;
+ if (Tag.Scan(Start,End - Start) == true)
+ return true;
+
+ // This appends a double new line (for the real eof handling)
+ if (Fill() == false)
+ return false;
- // 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());
/*}}}*/
// 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;
Stop = Section = Start;
memset(AlphaIndexes,0,sizeof(AlphaIndexes));
- if (Stop == 0 || MaxLength == 0)
+ 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)
{
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')
{
Indexes[TagCount] = Stop - Section;
- for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r'); Stop++);
+ TrimRecord(false,End);
return true;
}
Stop++;
}
- if ((Stop+1 >= End) && (End[-1] == '\n' || End[-1] == '\r'))
- {
- Indexes[TagCount] = (End - 1) - Section;
- return true;
- }
-
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. */
return true;
}
/*}}}*/
-
// TFRewrite - Rewrite a control record /*{{{*/
// ---------------------------------------------------------------------
/* This writes the control record to stdout rewriting it as necessary. The
projects / apt.git / blobdiff