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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: contents.cc,v 1.4 2003/02/10 07:34:41 doogie Exp $
/* ######################################################################
contents - Archive contents generator
The GenContents class is a back end for an archive contents generator.
It takes a list of per-deb file name and merges it into a memory
database of all previous output. This database is stored as a set
of binary trees linked across directories to form a tree of all files+dirs
given to it. The tree will also be sorted as it is built up thus
removing the massive sort time overhead.
By breaking all the pathnames into components and storing them
separately a space savings is realized by not duplicating the string
over and over again. Ultimately this saving is sacrificed to storage of
the tree structure itself but the tree structure yields a speed gain
in the sorting and processing. Ultimately it takes about 5 seconds to
do 141000 nodes and about 5 meg of ram.
The tree looks something like:
usr/
/ \ / libslang
bin/ lib/ --> libc6
/ \ \ libfoo
games/ sbin/
The ---> is the DirDown link
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include "contents.h"
#include <apti18n.h>
#include <apt-pkg/extracttar.h>
#include <apt-pkg/error.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
/*}}}*/
// GenContents::~GenContents - Free allocated memory /*{{{*/
// ---------------------------------------------------------------------
/* Since all our allocations are static big-block allocations all that is
needed is to free all of them. */
GenContents::~GenContents()
{
while (BlockList != 0)
{
BigBlock *Old = BlockList;
BlockList = Old->Next;
free(Old->Block);
delete Old;
}
}
/*}}}*/
// GenContents::Mystrdup - Custom strdup /*{{{*/
// ---------------------------------------------------------------------
/* This strdup also uses a large block allocator to eliminate glibc
overhead */
char *GenContents::Mystrdup(const char *From)
{
unsigned int Len = strlen(From) + 1;
if (StrLeft <= Len)
{
StrLeft = 4096*10;
StrPool = (char *)malloc(StrLeft);
BigBlock *Block = new BigBlock;
Block->Block = StrPool;
Block->Next = BlockList;
BlockList = Block;
}
memcpy(StrPool,From,Len);
StrLeft -= Len;
char *Res = StrPool;
StrPool += Len;
return Res;
}
/*}}}*/
// GenContents::Node::operator new - Big block allocator /*{{{*/
// ---------------------------------------------------------------------
/* This eliminates glibc's malloc overhead by allocating large blocks and
having a continuous set of Nodes. This takes about 8 bytes off each nodes
space needs. Freeing is not supported. */
void *GenContents::Node::operator new(size_t Amount,GenContents *Owner)
{
if (Owner->NodeLeft == 0)
{
Owner->NodeLeft = 10000;
Owner->NodePool = (Node *)malloc(Amount*Owner->NodeLeft);
BigBlock *Block = new BigBlock;
Block->Block = Owner->NodePool;
Block->Next = Owner->BlockList;
Owner->BlockList = Block;
}
Owner->NodeLeft--;
return Owner->NodePool++;
}
/*}}}*/
// GenContents::Grab - Grab a new node representing Name under Top /*{{{*/
// ---------------------------------------------------------------------
/* This grabs a new node representing the pathname component Name under
the node Top. The node is given the name Package. It is assumed that Name
is inside of top. If a duplicate already entered name is found then
a note is made on the Dup list and the previous in-tree node is returned. */
GenContents::Node *GenContents::Grab(GenContents::Node *Top,const char *Name,
const char *Package)
{
/* We drop down to the next dir level each call. This simplifies
the calling routine */
if (Top->DirDown == 0)
{
Node *Item = new(this) Node;
Item->Path = Mystrdup(Name);
Item->Package = Package;
Top->DirDown = Item;
return Item;
}
Top = Top->DirDown;
int Res;
while (1)
{
Res = strcmp(Name,Top->Path);
// Collision!
if (Res == 0)
{
// See if this the the same package (multi-version dup)
if (Top->Package == Package ||
strcasecmp(Top->Package,Package) == 0)
return Top;
// Look for an already existing Dup
for (Node *I = Top->Dups; I != 0; I = I->Dups)
if (I->Package == Package ||
strcasecmp(I->Package,Package) == 0)
return Top;
// Add the dup in
Node *Item = new(this) Node;
Item->Path = Top->Path;
Item->Package = Package;
Item->Dups = Top->Dups;
Top->Dups = Item;
return Top;
}
// Continue to traverse the tree
if (Res < 0)
{
if (Top->BTreeLeft == 0)
break;
Top = Top->BTreeLeft;
}
else
{
if (Top->BTreeRight == 0)
break;
Top = Top->BTreeRight;
}
}
// The item was not found in the tree
Node *Item = new(this) Node;
Item->Path = Mystrdup(Name);
Item->Package = Package;
// Link it into the tree
if (Res < 0)
{
Item->BTreeLeft = Top->BTreeLeft;
Top->BTreeLeft = Item;
}
else
{
Item->BTreeRight = Top->BTreeRight;
Top->BTreeRight = Item;
}
return Item;
}
/*}}}*/
// GenContents::Add - Add a path to the tree /*{{{*/
// ---------------------------------------------------------------------
/* This takes a full pathname and adds it into the tree. We split the
pathname into directory fragments adding each one as we go. Technically
in output from tar this should result in hitting previous items. */
void GenContents::Add(const char *Dir,const char *Package)
{
Node *Root = &this->Root;
// Drop leading slashes
while (*Dir == '/' && *Dir != 0)
Dir++;
// Run over the string and grab out each bit up to and including a /
const char *Start = Dir;
const char *I = Dir;
while (*I != 0)
{
if (*I != '/' || I - Start <= 1)
{
I++;
continue;
}
I++;
// Copy the path fragment over
char Tmp[1024];
strncpy(Tmp,Start,I - Start);
Tmp[I - Start] = 0;
// Grab a node for it
Root = Grab(Root,Tmp,Package);
Start = I;
}
// The final component if it does not have a trailing /
if (I - Start >= 1)
Root = Grab(Root,Start,Package);
}
/*}}}*/
// GenContents::WriteSpace - Write a given number of white space chars /*{{{*/
// ---------------------------------------------------------------------
/* We mod 8 it and write tabs where possible. */
void GenContents::WriteSpace(FILE *Out,unsigned int Current,unsigned int Target)
{
if (Target <= Current)
Target = Current + 1;
/* Now we write tabs so long as the next tab stop would not pass
the target */
for (; (Current/8 + 1)*8 < Target; Current = (Current/8 + 1)*8)
fputc('\t',Out);
// Fill the last bit with spaces
for (; Current < Target; Current++)
fputc(' ',Out);
}
/*}}}*/
// GenContents::Print - Display the tree /*{{{*/
// ---------------------------------------------------------------------
/* This is the final result function. It takes the tree and recursively
calls itself and runs over each section of the tree printing out
the pathname and the hit packages. We use Buf to build the pathname
summed over all the directory parents of this node. */
void GenContents::Print(FILE *Out)
{
char Buffer[1024];
Buffer[0] = 0;
DoPrint(Out,&Root,Buffer);
}
void GenContents::DoPrint(FILE *Out,GenContents::Node *Top, char *Buf)
{
if (Top == 0)
return;
// Go left
DoPrint(Out,Top->BTreeLeft,Buf);
// Print the current dir location and then descend to lower dirs
char *OldEnd = Buf + strlen(Buf);
if (Top->Path != 0)
{
strcat(Buf,Top->Path);
// Do not show the item if it is a directory with dups
if (Top->Path[strlen(Top->Path)-1] != '/' /*|| Top->Dups == 0*/)
{
fputs(Buf,Out);
WriteSpace(Out,strlen(Buf),60);
for (Node *I = Top; I != 0; I = I->Dups)
{
if (I != Top)
fputc(',',Out);
fputs(I->Package,Out);
}
fputc('\n',Out);
}
}
// Go along the directory link
DoPrint(Out,Top->DirDown,Buf);
*OldEnd = 0;
// Go right
DoPrint(Out,Top->BTreeRight,Buf);
}
/*}}}*/
// ContentsExtract::Read - Read the archive /*{{{*/
// ---------------------------------------------------------------------
/* */
bool ContentsExtract::Read(debDebFile &Deb)
{
Reset();
// Get the archive member and positition the file
const ARArchive::Member *Member = Deb.GotoMember("data.tar.gz");
const char *Compressor = "gzip";
if (Member == 0) {
Member = Deb.GotoMember("data.tar.bz2");
Compressor = "bzip2";
}
if (Member == 0) {
Member = Deb.GotoMember("data.tar.lzma");
Compressor = "lzma";
}
if (Member == 0) {
_error->Error(_("Internal error, could not locate member %s"),
"data.tar.{gz,bz2,lzma}");
return false;
}
// Extract it.
ExtractTar Tar(Deb.GetFile(),Member->Size,Compressor);
if (Tar.Go(*this) == false)
return false;
return true;
}
/*}}}*/
// ContentsExtract::DoItem - Extract an item /*{{{*/
// ---------------------------------------------------------------------
/* This just tacks the name onto the end of our memory buffer */
bool ContentsExtract::DoItem(Item &Itm,int &Fd)
{
unsigned long Len = strlen(Itm.Name);
// Strip leading ./'s
if (Itm.Name[0] == '.' && Itm.Name[1] == '/')
{
// == './'
if (Len == 2)
return true;
Len -= 2;
Itm.Name += 2;
}
// Allocate more storage for the string list
if (CurSize + Len + 2 >= MaxSize || Data == 0)
{
if (MaxSize == 0)
MaxSize = 512*1024/2;
char *NewData = (char *)realloc(Data,MaxSize*2);
if (NewData == 0)
return _error->Error(_("realloc - Failed to allocate memory"));
Data = NewData;
MaxSize *= 2;
}
strcpy(Data+CurSize,Itm.Name);
CurSize += Len + 1;
return true;
}
/*}}}*/
// ContentsExtract::TakeContents - Load the contents data /*{{{*/
// ---------------------------------------------------------------------
/* */
bool ContentsExtract::TakeContents(const void *NewData,unsigned long Length)
{
if (Length == 0)
{
CurSize = 0;
return true;
}
// Allocate more storage for the string list
if (Length + 2 >= MaxSize || Data == 0)
{
if (MaxSize == 0)
MaxSize = 512*1024/2;
while (MaxSize*2 <= Length)
MaxSize *= 2;
char *NewData = (char *)realloc(Data,MaxSize*2);
if (NewData == 0)
return _error->Error(_("realloc - Failed to allocate memory"));
Data = NewData;
MaxSize *= 2;
}
memcpy(Data,NewData,Length);
CurSize = Length;
return Data[CurSize-1] == 0;
}
/*}}}*/
// ContentsExtract::Add - Read the contents data into the sorter /*{{{*/
// ---------------------------------------------------------------------
/* */
void ContentsExtract::Add(GenContents &Contents,string Package)
{
const char *Start = Data;
char *Pkg = Contents.Mystrdup(Package.c_str());
for (const char *I = Data; I < Data + CurSize; I++)
{
if (*I == 0)
{
Contents.Add(Start,Pkg);
Start = ++I;
}
}
}
/*}}}*/