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Diffstat (limited to 'apt-inst/contrib/arfile.cc')
| -rw-r--r-- | apt-inst/contrib/arfile.cc | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/apt-inst/contrib/arfile.cc b/apt-inst/contrib/arfile.cc new file mode 100644 index 000000000..c2964b7a9 --- /dev/null +++ b/apt-inst/contrib/arfile.cc @@ -0,0 +1,154 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +// $Id: arfile.cc,v 1.2 2001/02/20 07:03:16 jgg 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 /*{{{*/ +#ifdef __GNUG__ +#pragma implementation "apt-pkg/arfile.h" +#endif +#include <apt-pkg/arfile.h> +#include <apt-pkg/strutl.h> +#include <apt-pkg/error.h> + +#include <stdlib.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"); + } + + // 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 >= strlen(S)) + { + delete Memb; + return _error->Error("Invalid archive member header"); + } + if (File.Read(S,Len) == false) + 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] == ' '; I--); + Memb->Name = string(Head.Name,0,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; +} + /*}}}*/ |