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|
// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
/* ######################################################################
AR File - Handle an 'AR' archive
AR Archives have plain text headers at the start of each file
section. The headers are aligned on a 2 byte boundary.
Information about the structure of AR files can be found in ar(5)
on a BSD system, or in the binutils source.
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include <config.h>
#include <apt-pkg/arfile.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/strutl.h>
#include <cstring>
#include <string>
#include <sys/types.h>
#include <apti18n.h>
/*}}}*/
struct ARArchive::MemberHeader
{
char Name[16];
char MTime[12];
char UID[6];
char GID[6];
char Mode[8];
char Size[10];
char Magic[2];
};
// ARArchive::ARArchive - Constructor /*{{{*/
// ---------------------------------------------------------------------
/* */
ARArchive::ARArchive(FileFd &File) : List(0), File(File)
{
LoadHeaders();
}
/*}}}*/
// ARArchive::~ARArchive - Destructor /*{{{*/
// ---------------------------------------------------------------------
/* */
ARArchive::~ARArchive()
{
while (List != 0)
{
Member *Tmp = List;
List = List->Next;
delete Tmp;
}
}
/*}}}*/
// ARArchive::LoadHeaders - Load the headers from each file /*{{{*/
// ---------------------------------------------------------------------
/* AR files are structured with a 8 byte magic string followed by a 60
byte plain text header then the file data, another header, data, etc */
bool ARArchive::LoadHeaders()
{
off_t Left = File.Size();
// Check the magic byte
char Magic[8];
if (File.Read(Magic,sizeof(Magic)) == false)
return false;
if (memcmp(Magic,"!<arch>\012",sizeof(Magic)) != 0)
return _error->Error(_("Invalid archive signature"));
Left -= sizeof(Magic);
// Read the member list
while (Left > 0)
{
MemberHeader Head;
if (File.Read(&Head,sizeof(Head)) == false)
return _error->Error(_("Error reading archive member header"));
Left -= sizeof(Head);
// Convert all of the integer members
Member *Memb = new Member();
if (StrToNum(Head.MTime,Memb->MTime,sizeof(Head.MTime)) == false ||
StrToNum(Head.UID,Memb->UID,sizeof(Head.UID)) == false ||
StrToNum(Head.GID,Memb->GID,sizeof(Head.GID)) == false ||
StrToNum(Head.Mode,Memb->Mode,sizeof(Head.Mode),8) == false ||
StrToNum(Head.Size,Memb->Size,sizeof(Head.Size)) == false)
{
delete Memb;
return _error->Error(_("Invalid archive member header"));
}
if (Left < 0 || Memb->Size > static_cast<unsigned long long>(Left))
{
delete Memb;
return _error->Error(_("Invalid archive member header"));
}
// Check for an extra long name string
if (memcmp(Head.Name,"#1/",3) == 0)
{
char S[300];
unsigned long Len;
if (StrToNum(Head.Name+3,Len,sizeof(Head.Size)-3) == false ||
Len >= sizeof(S))
{
delete Memb;
return _error->Error(_("Invalid archive member header"));
}
if (Len > Memb->Size)
{
delete Memb;
return _error->Error(_("Invalid archive member header"));
}
if (File.Read(S,Len) == false)
{
delete Memb;
return false;
}
S[Len] = 0;
Memb->Name = S;
Memb->Size -= Len;
Left -= Len;
}
else
{
unsigned int I = sizeof(Head.Name) - 1;
for (; Head.Name[I] == ' ' || Head.Name[I] == '/'; I--)
{
if (I == 0)
{
delete Memb;
return _error->Error(_("Invalid archive member header"));
}
}
Memb->Name = std::string(Head.Name,I+1);
}
// Account for the AR header alignment
off_t Skip = Memb->Size % 2;
// Add it to the list
Memb->Next = List;
List = Memb;
Memb->Start = File.Tell();
if (File.Skip(Memb->Size + Skip) == false)
return false;
if (Left < (off_t)(Memb->Size + Skip))
return _error->Error(_("Archive is too short"));
Left -= Memb->Size + Skip;
}
if (Left != 0)
return _error->Error(_("Failed to read the archive headers"));
return true;
}
/*}}}*/
// ARArchive::FindMember - Find a name in the member list /*{{{*/
// ---------------------------------------------------------------------
/* Find a member with the given name */
const ARArchive::Member *ARArchive::FindMember(const char *Name) const
{
const Member *Res = List;
while (Res != 0)
{
if (Res->Name == Name)
return Res;
Res = Res->Next;
}
return 0;
}
/*}}}*/
|
