Add functionality to cvtres to parse all entries in res file.

Summary: Added the new modules in the Object/ folder.  Updated the
llvm-cvtres interface as well, and added additional tests.

Subscribers: llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D33180

llvm-svn: 303480

1 files changed, 92 insertions, 0 deletions

diff --git a/llvm/lib/Object/WindowsResource.cpp b/llvm/lib/Object/WindowsResource.cpp
new file mode 100644
index 00000000000..29a02b8a27d
--- /dev/null
+++ b/llvm/lib/Object/WindowsResource.cpp
@@ -0,0 +1,92 @@
+//===-- WindowsResource.cpp -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the .res file class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/WindowsResource.h"
+#include "llvm/Object/Error.h"
+#include <system_error>
+
+namespace llvm {
+namespace object {
+
+static const char ResourceMagic[] = {
+    '\0',   '\0',   '\0', '\0', '\x20', '\0',   '\0', '\0',
+    '\xff', '\xff', '\0', '\0', '\xff', '\xff', '\0', '\0'};
+
+static const char NullEntry[16] = {'\0'};
+
+#define RETURN_IF_ERROR(X)                                                     \
+  if (auto EC = X)                                                             \
+    return EC;
+
+WindowsResource::WindowsResource(MemoryBufferRef Source)
+    : Binary(Binary::ID_WinRes, Source) {
+  size_t LeadingSize = sizeof(ResourceMagic) + sizeof(NullEntry);
+  BBS = BinaryByteStream(Data.getBuffer().drop_front(LeadingSize),
+                         support::little);
+}
+
+WindowsResource::~WindowsResource() = default;
+
+Expected<std::unique_ptr<WindowsResource>>
+WindowsResource::createWindowsResource(MemoryBufferRef Source) {
+  if (Source.getBufferSize() < sizeof(ResourceMagic) + sizeof(NullEntry))
+    return make_error<GenericBinaryError>(
+        "File too small to be a resource file",
+        object_error::invalid_file_type);
+  std::unique_ptr<WindowsResource> Ret(new WindowsResource(Source));
+  return std::move(Ret);
+}
+
+Expected<ResourceEntryRef> WindowsResource::getHeadEntry() {
+  Error Err = Error::success();
+  auto Ref = ResourceEntryRef(BinaryStreamRef(BBS), this, Err);
+  if (Err)
+    return std::move(Err);
+  return Ref;
+}
+
+ResourceEntryRef::ResourceEntryRef(BinaryStreamRef Ref,
+                                   const WindowsResource *Owner, Error &Err)
+    : Reader(Ref), OwningRes(Owner) {
+  if (loadNext())
+    Err = make_error<GenericBinaryError>("Could not read first entry.",
+                                         object_error::unexpected_eof);
+}
+
+Error ResourceEntryRef::moveNext(bool &End) {
+  // Reached end of all the entries.
+  if (Reader.bytesRemaining() == 0) {
+    End = true;
+    return Error::success();
+  }
+  RETURN_IF_ERROR(loadNext());
+
+  return Error::success();
+}
+
+Error ResourceEntryRef::loadNext() {
+  uint32_t DataSize;
+  RETURN_IF_ERROR(Reader.readInteger(DataSize));
+  uint32_t HeaderSize;
+  RETURN_IF_ERROR(Reader.readInteger(HeaderSize));
+  // The data and header size ints are themselves part of the header, so we must
+  // subtract them from the size.
+  RETURN_IF_ERROR(
+      Reader.readStreamRef(HeaderBytes, HeaderSize - 2 * sizeof(uint32_t)));
+  RETURN_IF_ERROR(Reader.readStreamRef(DataBytes, DataSize));
+  RETURN_IF_ERROR(Reader.padToAlignment(sizeof(uint32_t)));
+  return Error::success();
+}
+
+} // namespace object
+} // namespace llvm