dom/media/ByteWriter.h
author Mike Hommey <mh+mozilla@glandium.org>
Fri, 11 Jan 2019 16:01:15 +0000
changeset 453570 daf50f25895db073e44d50fecf2e4f6fe873865d
parent 446960 0ceae9db9ec0be18daa1a279511ad305723185d4
child 474693 c4045738b0cdb76f1ff2c492c390751147bce62c
permissions -rw-r--r--
Bug 1519307 - Add a new project to build useful parts of breakpad independently. r=froydnj With `ac_add_options --enable-project=tools/crashreporter` in a mozconfig, `./mach build` builds minidump_stackwalk, dump_syms and fileid. One caveat is that due to limitation in how the build system works currently, it's cumbersome to keep dump_syms as a host program for Gecko, and to make it a target program for this project. For now, keep it as a host program. We're not going to use it on automation, but it's still convenient to have for quick local builds (I've had to resort to awful hacks downstream). Differential Revision: https://phabricator.services.mozilla.com/D16299

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef BYTE_WRITER_H_
#define BYTE_WRITER_H_

#include "mozilla/EndianUtils.h"
#include "nsTArray.h"

namespace mozilla {

class ByteWriter {
 public:
  explicit ByteWriter(nsTArray<uint8_t>& aData) : mPtr(aData) {}
  ~ByteWriter() {}

  MOZ_MUST_USE bool WriteU8(uint8_t aByte) { return Write(&aByte, 1); }

  MOZ_MUST_USE bool WriteU16(uint16_t aShort) {
    uint8_t c[2];
    mozilla::BigEndian::writeUint16(&c[0], aShort);
    return Write(&c[0], 2);
  }

  MOZ_MUST_USE bool WriteU32(uint32_t aLong) {
    uint8_t c[4];
    mozilla::BigEndian::writeUint32(&c[0], aLong);
    return Write(&c[0], 4);
  }

  MOZ_MUST_USE bool Write32(int32_t aLong) {
    uint8_t c[4];
    mozilla::BigEndian::writeInt32(&c[0], aLong);
    return Write(&c[0], 4);
  }

  MOZ_MUST_USE bool WriteU64(uint64_t aLongLong) {
    uint8_t c[8];
    mozilla::BigEndian::writeUint64(&c[0], aLongLong);
    return Write(&c[0], 8);
  }

  MOZ_MUST_USE bool Write64(int64_t aLongLong) {
    uint8_t c[8];
    mozilla::BigEndian::writeInt64(&c[0], aLongLong);
    return Write(&c[0], 8);
  }

  MOZ_MUST_USE bool Write(const uint8_t* aSrc, size_t aCount) {
    return mPtr.AppendElements(aSrc, aCount, mozilla::fallible);
  }

 private:
  nsTArray<uint8_t>& mPtr;
};

}  // namespace mozilla

#endif