third_party/WebKit/Source/modules/filesystem/FileWriterSync.cpp

/*
 * Copyright (C) 2010 Google Inc.  All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "modules/filesystem/FileWriterSync.h"

#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "core/fileapi/Blob.h"
#include "public/platform/WebFileWriter.h"
#include "public/platform/WebURL.h"

namespace blink {

void FileWriterSync::write(Blob* data, ExceptionState& exception_state) {
  DCHECK(data);
  DCHECK(Writer());
  DCHECK(complete_);

  PrepareForWrite();
  Writer()->Write(position(), data->Uuid());
  DCHECK(complete_);
  if (error_) {
    FileError::ThrowDOMException(exception_state, error_);
    return;
  }
  SetPosition(position() + data->size());
  if (position() > length())
    SetLength(position());
}

void FileWriterSync::seek(long long position, ExceptionState& exception_state) {
  DCHECK(Writer());
  DCHECK(complete_);
  SeekInternal(position);
}

void FileWriterSync::truncate(long long offset,
                              ExceptionState& exception_state) {
  DCHECK(Writer());
  DCHECK(complete_);
  if (offset < 0) {
    exception_state.ThrowDOMException(kInvalidStateError,
                                      FileError::kInvalidStateErrorMessage);
    return;
  }
  PrepareForWrite();
  Writer()->Truncate(offset);
  DCHECK(complete_);
  if (error_) {
    FileError::ThrowDOMException(exception_state, error_);
    return;
  }
  if (offset < position())
    SetPosition(offset);
  SetLength(offset);
}

void FileWriterSync::DidWrite(long long bytes, bool complete) {
  DCHECK_EQ(FileError::kOK, error_);
  DCHECK(!complete_);
  complete_ = complete;
}

void FileWriterSync::DidTruncate() {
  DCHECK_EQ(FileError::kOK, error_);
  DCHECK(!complete_);
  complete_ = true;
}

void FileWriterSync::DidFail(WebFileError error) {
  DCHECK_EQ(FileError::kOK, error_);
  error_ = static_cast<FileError::ErrorCode>(error);
  DCHECK(!complete_);
  complete_ = true;
}

FileWriterSync::FileWriterSync() : error_(FileError::kOK), complete_(true) {}

void FileWriterSync::PrepareForWrite() {
  DCHECK(complete_);
  error_ = FileError::kOK;
  complete_ = false;
}

FileWriterSync::~FileWriterSync() {}

DEFINE_TRACE(FileWriterSync) {
  FileWriterBase::Trace(visitor);
}

}  // namespace blink