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Start adding thin archive support.

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This is just sufficient for 'ar t' to work.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224307 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-12-16 01:43:41 +00:00
parent c981753745
commit 96b7967f83
4 changed files with 29 additions and 8 deletions
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20
lib/Object/Archive.cpp
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@ -22,6 +22,7 @@ using namespace llvm;
using namespace object;
static const char *const Magic = "!<arch>\n";
static const char *const ThinMagic = "!<thin>\n";
void Archive::anchor() { }
@ -86,7 +87,10 @@ Archive::Child::Child(const Archive *Parent, const char *Start)
const ArchiveMemberHeader *Header =
reinterpret_cast<const ArchiveMemberHeader *>(Start);
Data = StringRef(Start, sizeof(ArchiveMemberHeader) + Header->getSize());
uint64_t Size = sizeof(ArchiveMemberHeader);
if (!Parent->IsThin || Header->getName() == "/" || Header->getName() == "//")
Size += Header->getSize();
Data = StringRef(Start, Size);
// Setup StartOfFile and PaddingBytes.
StartOfFile = sizeof(ArchiveMemberHeader);
@ -100,6 +104,12 @@ Archive::Child::Child(const Archive *Parent, const char *Start)
}
}
uint64_t Archive::Child::getSize() const {
if (Parent->IsThin)
return getHeader()->getSize();
return Data.size() - StartOfFile;
}
Archive::Child Archive::Child::getNext() const {
size_t SpaceToSkip = Data.size();
// If it's odd, add 1 to make it even.
@ -186,9 +196,13 @@ ErrorOr<std::unique_ptr<Archive>> Archive::create(MemoryBufferRef Source) {
Archive::Archive(MemoryBufferRef Source, std::error_code &ec)
: Binary(Binary::ID_Archive, Source), SymbolTable(child_end()) {
StringRef Buffer = Data.getBuffer();
// Check for sufficient magic.
if (Data.getBufferSize() < 8 ||
StringRef(Data.getBufferStart(), 8) != Magic) {
if (Buffer.startswith(ThinMagic)) {
IsThin = true;
} else if (Buffer.startswith(Magic)) {
IsThin = false;
} else {
ec = object_error::invalid_file_type;
return;
}