// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: arfile.cc,v 1.6.2.1 2004/01/16 18:58:50 mdz Exp $ /* ###################################################################### 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 boundry. 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/strutl.h> #include <apt-pkg/fileutl.h> #include <apt-pkg/error.h> #include <stdlib.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() { signed long 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 %s"), Head.Name); } // 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 (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--); Memb->Name = std::string(Head.Name,I+1); } // Account for the AR header alignment unsigned 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 < (signed)(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; } /*}}}*/