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Object/Mach-O: Validate Mach-O magic and initialize format info.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120195 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2010-11-27 06:39:22 +00:00
parent 2a0e97431e
commit 95369163f5
2 changed files with 33 additions and 5 deletions
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26
lib/Object/MachOObject.cpp
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@ -8,16 +8,38 @@
//===----------------------------------------------------------------------===//
#include "llvm/Object/MachOObject.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace llvm;
using namespace object;
MachOObject::MachOObject(MemoryBuffer *Buffer_) : Buffer(Buffer_) {
MachOObject::MachOObject(MemoryBuffer *Buffer_, bool IsLittleEndian_,
bool Is64Bit_)
: Buffer(Buffer_), IsLittleEndian(IsLittleEndian_), Is64Bit(Is64Bit_) {
}
MachOObject *MachOObject::LoadFromBuffer(MemoryBuffer *Buffer,
std::string *ErrorStr) {
// First, check the magic value and initialize the basic object info.
bool IsLittleEndian = false, Is64Bit = false;
StringRef Magic = Buffer->getBuffer().slice(0, 4);
if (Magic == "\xFE\xED\xFA\xCE") {
} else if (Magic == "\xCE\xFA\xED\xFE") {
IsLittleEndian = true;
} else if (Magic == "\xFE\xED\xFA\xCF") {
Is64Bit = true;
} else if (Magic == "\xCF\xFA\xED\xFE") {
IsLittleEndian = true;
Is64Bit = true;
} else {
*ErrorStr = "not a Mach object file";
return 0;
}
OwningPtr<MachOObject> Object(new MachOObject(Buffer, IsLittleEndian,
Is64Bit));
if (ErrorStr) *ErrorStr = "";
return new MachOObject(Buffer);
return Object.take();
}