| | 1 | // -*- mode: cpp; mode: fold -*- |
| | 2 | // Description /*{{{*/ |
| | 3 | // $Id: arfile.cc,v 1.6.2.1 2004/01/16 18:58:50 mdz Exp $ |
| | 4 | /* ###################################################################### |
| | 5 | |
| | 6 | AR File - Handle an 'AR' archive |
| | 7 | |
| | 8 | AR Archives have plain text headers at the start of each file |
| | 9 | section. The headers are aligned on a 2 byte boundry. |
| | 10 | |
| | 11 | Information about the structure of AR files can be found in ar(5) |
| | 12 | on a BSD system, or in the binutils source. |
| | 13 | |
| | 14 | ##################################################################### */ |
| | 15 | /*}}}*/ |
| | 16 | // Include Files /*{{{*/ |
| | 17 | #include <apt-pkg/arfile.h> |
| | 18 | #include <apt-pkg/strutl.h> |
| | 19 | #include <apt-pkg/error.h> |
| | 20 | |
| | 21 | #include <stdlib.h> |
| | 22 | /*}}}*/ |
| | 23 | #include <apti18n.h> |
| | 24 | |
| | 25 | struct ARArchive::MemberHeader |
| | 26 | { |
| | 27 | char Name[16]; |
| | 28 | char MTime[12]; |
| | 29 | char UID[6]; |
| | 30 | char GID[6]; |
| | 31 | char Mode[8]; |
| | 32 | char Size[10]; |
| | 33 | char Magic[2]; |
| | 34 | }; |
| | 35 | |
| | 36 | // ARArchive::ARArchive - Constructor /*{{{*/ |
| | 37 | // --------------------------------------------------------------------- |
| | 38 | /* */ |
| | 39 | ARArchive::ARArchive(FileFd &File) : List(0), File(File) |
| | 40 | { |
| | 41 | LoadHeaders(); |
| | 42 | } |
| | 43 | /*}}}*/ |
| | 44 | // ARArchive::~ARArchive - Destructor /*{{{*/ |
| | 45 | // --------------------------------------------------------------------- |
| | 46 | /* */ |
| | 47 | ARArchive::~ARArchive() |
| | 48 | { |
| | 49 | while (List != 0) |
| | 50 | { |
| | 51 | Member *Tmp = List; |
| | 52 | List = List->Next; |
| | 53 | delete Tmp; |
| | 54 | } |
| | 55 | } |
| | 56 | /*}}}*/ |
| | 57 | // ARArchive::LoadHeaders - Load the headers from each file /*{{{*/ |
| | 58 | // --------------------------------------------------------------------- |
| | 59 | /* AR files are structured with a 8 byte magic string followed by a 60 |
| | 60 | byte plain text header then the file data, another header, data, etc */ |
| | 61 | bool ARArchive::LoadHeaders() |
| | 62 | { |
| | 63 | signed long Left = File.Size(); |
| | 64 | |
| | 65 | // Check the magic byte |
| | 66 | char Magic[8]; |
| | 67 | if (File.Read(Magic,sizeof(Magic)) == false) |
| | 68 | return false; |
| | 69 | if (memcmp(Magic,"!<arch>\012",sizeof(Magic)) != 0) |
| | 70 | return _error->Error(_("Invalid archive signature")); |
| | 71 | Left -= sizeof(Magic); |
| | 72 | |
| | 73 | // Read the member list |
| | 74 | while (Left > 0) |
| | 75 | { |
| | 76 | MemberHeader Head; |
| | 77 | if (File.Read(&Head,sizeof(Head)) == false) |
| | 78 | return _error->Error(_("Error reading archive member header")); |
| | 79 | Left -= sizeof(Head); |
| | 80 | |
| | 81 | // Convert all of the integer members |
| | 82 | Member *Memb = new Member(); |
| | 83 | if (StrToNum(Head.MTime,Memb->MTime,sizeof(Head.MTime)) == false || |
| | 84 | StrToNum(Head.UID,Memb->UID,sizeof(Head.UID)) == false || |
| | 85 | StrToNum(Head.GID,Memb->GID,sizeof(Head.GID)) == false || |
| | 86 | StrToNum(Head.Mode,Memb->Mode,sizeof(Head.Mode),8) == false || |
| | 87 | StrToNum(Head.Size,Memb->Size,sizeof(Head.Size)) == false) |
| | 88 | { |
| | 89 | delete Memb; |
| | 90 | return _error->Error(_("Invalid archive member header")); |
| | 91 | } |
| | 92 | |
| | 93 | // Check for an extra long name string |
| | 94 | if (memcmp(Head.Name,"#1/",3) == 0) |
| | 95 | { |
| | 96 | char S[300]; |
| | 97 | unsigned long Len; |
| | 98 | if (StrToNum(Head.Name+3,Len,sizeof(Head.Size)-3) == false || |
| | 99 | Len >= strlen(S)) |
| | 100 | { |
| | 101 | delete Memb; |
| | 102 | return _error->Error(_("Invalid archive member header")); |
| | 103 | } |
| | 104 | if (File.Read(S,Len) == false) |
| | 105 | return false; |
| | 106 | S[Len] = 0; |
| | 107 | Memb->Name = S; |
| | 108 | Memb->Size -= Len; |
| | 109 | Left -= Len; |
| | 110 | } |
| | 111 | else |
| | 112 | { |
| | 113 | unsigned int I = sizeof(Head.Name) - 1; |
| | 114 | for (; Head.Name[I] == ' '; I--); |
| | 115 | Memb->Name = string(Head.Name,I+1); |
| | 116 | } |
| | 117 | |
| | 118 | // Account for the AR header alignment |
| | 119 | unsigned Skip = Memb->Size % 2; |
| | 120 | |
| | 121 | // Add it to the list |
| | 122 | Memb->Next = List; |
| | 123 | List = Memb; |
| | 124 | Memb->Start = File.Tell(); |
| | 125 | if (File.Skip(Memb->Size + Skip) == false) |
| | 126 | return false; |
| | 127 | if (Left < (signed)(Memb->Size + Skip)) |
| | 128 | return _error->Error(_("Archive is too short")); |
| | 129 | Left -= Memb->Size + Skip; |
| | 130 | } |
| | 131 | if (Left != 0) |
| | 132 | return _error->Error(_("Failed to read the archive headers")); |
| | 133 | |
| | 134 | return true; |
| | 135 | } |
| | 136 | /*}}}*/ |
| | 137 | // ARArchive::FindMember - Find a name in the member list /*{{{*/ |
| | 138 | // --------------------------------------------------------------------- |
| | 139 | /* Find a member with the given name */ |
| | 140 | const ARArchive::Member *ARArchive::FindMember(const char *Name) const |
| | 141 | { |
| | 142 | const Member *Res = List; |
| | 143 | while (Res != 0) |
| | 144 | { |
| | 145 | if (Res->Name == Name) |
| | 146 | return Res; |
| | 147 | Res = Res->Next; |
| | 148 | } |
| | 149 | |
| | 150 | return 0; |
| | 151 | } |
| | 152 | /*}}}*/ |
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