//===- ModuleDebugFileChecksumFragment.cpp ----------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "llvm/DebugInfo/CodeView/ModuleDebugFileChecksumFragment.h"

#include "llvm/DebugInfo/CodeView/CodeViewError.h"
#include "llvm/Support/BinaryStreamReader.h"

using namespace llvm;
using namespace llvm::codeview;

struct FileChecksumEntryHeader {
  using ulittle32_t = support::ulittle32_t;

  ulittle32_t FileNameOffset; // Byte offset of filename in global string table.
  uint8_t ChecksumSize;       // Number of bytes of checksum.
  uint8_t ChecksumKind;       // FileChecksumKind
                              // Checksum bytes follow.
};

Error llvm::VarStreamArrayExtractor<FileChecksumEntry>::extract(
    BinaryStreamRef Stream, uint32_t &Len, FileChecksumEntry &Item, void *Ctx) {
  BinaryStreamReader Reader(Stream);

  const FileChecksumEntryHeader *Header;
  if (auto EC = Reader.readObject(Header))
    return EC;

  Item.FileNameOffset = Header->FileNameOffset;
  Item.Kind = static_cast<FileChecksumKind>(Header->ChecksumKind);
  if (auto EC = Reader.readBytes(Item.Checksum, Header->ChecksumSize))
    return EC;

  Len = alignTo(Header->ChecksumSize + sizeof(FileChecksumEntryHeader), 4);
  return Error::success();
}

Error ModuleDebugFileChecksumFragment::initialize(BinaryStreamReader Reader) {
  if (auto EC = Reader.readArray(Checksums, Reader.bytesRemaining()))
    return EC;

  return Error::success();
}