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//===- Archive.cpp - ar File Format implementation --------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the ArchiveObjectFile class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/Archive.h"
#include "llvm/ADT/APInt.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace llvm;
using namespace object;
namespace {
const StringRef Magic = "!<arch>\n";
struct ArchiveMemberHeader {
char Name[16];
char LastModified[12];
char UID[6];
char GID[6];
char AccessMode[8];
char Size[10]; //< Size of data, not including header or padding.
char Terminator[2];
///! Get the name without looking up long names.
StringRef getName() const {
char EndCond = Name[0] == '/' ? ' ' : '/';
StringRef::size_type end = StringRef(Name, sizeof(Name)).find(EndCond);
if (end == StringRef::npos)
end = sizeof(Name);
assert(end <= sizeof(Name) && end > 0);
// Don't include the EndCond if there is one.
return StringRef(Name, end);
}
uint64_t getSize() const {
APInt ret;
StringRef(Size, sizeof(Size)).getAsInteger(10, ret);
return ret.getZExtValue();
}
};
const ArchiveMemberHeader *ToHeader(const char *base) {
return reinterpret_cast<const ArchiveMemberHeader *>(base);
}
}
Archive::Child Archive::Child::getNext() const {
size_t SpaceToSkip = sizeof(ArchiveMemberHeader) +
ToHeader(Data.data())->getSize();
// If it's odd, add 1 to make it even.
if (SpaceToSkip & 1)
++SpaceToSkip;
const char *NextLoc = Data.data() + SpaceToSkip;
// Check to see if this is past the end of the archive.
if (NextLoc >= Parent->Data->getBufferEnd())
return Child(Parent, StringRef(0, 0));
size_t NextSize = sizeof(ArchiveMemberHeader) +
ToHeader(NextLoc)->getSize();
return Child(Parent, StringRef(NextLoc, NextSize));
}
error_code Archive::Child::getName(StringRef &Result) const {
StringRef name = ToHeader(Data.data())->getName();
// Check if it's a special name.
if (name[0] == '/') {
if (name.size() == 1) { // Linker member.
Result = name;
return object_error::success;
}
if (name.size() == 2 && name[1] == '/') { // String table.
Result = name;
return object_error::success;
}
// It's a long name.
// Get the offset.
APInt offset;
name.substr(1).getAsInteger(10, offset);
const char *addr = Parent->StringTable->Data.begin()
+ sizeof(ArchiveMemberHeader)
+ offset.getZExtValue();
// Verify it.
if (Parent->StringTable == Parent->end_children()
|| addr < (Parent->StringTable->Data.begin()
+ sizeof(ArchiveMemberHeader))
|| addr > (Parent->StringTable->Data.begin()
+ sizeof(ArchiveMemberHeader)
+ Parent->StringTable->getSize()))
return object_error::parse_failed;
Result = addr;
return object_error::success;
}
// It's a simple name.
if (name[name.size() - 1] == '/')
Result = name.substr(0, name.size() - 1);
else
Result = name;
return object_error::success;
}
uint64_t Archive::Child::getSize() const {
return ToHeader(Data.data())->getSize();
}
MemoryBuffer *Archive::Child::getBuffer() const {
StringRef name;
if (getName(name)) return NULL;
return MemoryBuffer::getMemBuffer(Data.substr(sizeof(ArchiveMemberHeader),
getSize()),
name,
false);
}
error_code Archive::Child::getAsBinary(OwningPtr<Binary> &Result) const {
OwningPtr<Binary> ret;
if (error_code ec =
createBinary(getBuffer(), ret))
return ec;
Result.swap(ret);
return object_error::success;
}
Archive::Archive(MemoryBuffer *source, error_code &ec)
: Binary(Binary::isArchive, source)
, StringTable(Child(this, StringRef(0, 0))) {
// Check for sufficient magic.
if (!source || source->getBufferSize()
< (8 + sizeof(ArchiveMemberHeader) + 2) // Smallest archive.
|| StringRef(source->getBufferStart(), 8) != Magic) {
ec = object_error::invalid_file_type;
return;
}
// Get the string table. It's the 3rd member.
child_iterator StrTable = begin_children();
child_iterator e = end_children();
for (int i = 0; StrTable != e && i < 2; ++StrTable, ++i) {}
// Check to see if there were 3 members, or the 3rd member wasn't named "//".
StringRef name;
if (StrTable != e && !StrTable->getName(name) && name == "//")
StringTable = StrTable;
ec = object_error::success;
}
Archive::child_iterator Archive::begin_children() const {
const char *Loc = Data->getBufferStart() + Magic.size();
size_t Size = sizeof(ArchiveMemberHeader) +
ToHeader(Loc)->getSize();
return Child(this, StringRef(Loc, Size));
}
Archive::child_iterator Archive::end_children() const {
return Child(this, StringRef(0, 0));
}
namespace llvm {
} // end namespace llvm
|
