/// <summary>
/// 写入指定文件。
/// </summary>
/// <param name="name">要写入的文件名称。</param>
/// <param name="buffer">存储写入文件内容的二进制流。</param>
/// <param name="startIndex">存储写入文件内容的二进制流的起始位置。</param>
/// <param name="length">存储写入文件内容的二进制流的长度。</param>
/// <returns>是否写入指定文件成功。</returns>
public bool WriteFile(string name, byte[] buffer, int startIndex, int length)
{
if (m_Access != FileSystemAccess.Write && m_Access != FileSystemAccess.ReadWrite)
{
throw new GameFrameworkException("File system is not writable.");
}
if (string.IsNullOrEmpty(name))
{
throw new GameFrameworkException("Name is invalid.");
}
if (name.Length > byte.MaxValue)
{
throw new GameFrameworkException(Utility.Text.Format("Name '{0}' is too long.", name));
}
if (buffer == null)
{
throw new GameFrameworkException("Buffer is invalid.");
}
if (startIndex < 0 || length < 0 || startIndex + length > buffer.Length)
{
throw new GameFrameworkException("Start index or length is invalid.");
}
bool hasFile = false;
int oldBlockIndex = -1;
if (m_FileDatas.TryGetValue(name, out oldBlockIndex))
{
hasFile = true;
}
if (!hasFile && m_FileDatas.Count >= m_HeaderData.MaxFileCount)
{
return(false);
}
int blockIndex = AllocBlock(length);
if (blockIndex < 0)
{
return(false);
}
if (length > 0)
{
m_Stream.Position = GetClusterOffset(m_BlockDatas[blockIndex].ClusterIndex);
m_Stream.Write(buffer, startIndex, length);
}
ProcessWriteFile(name, hasFile, oldBlockIndex, blockIndex, length);
m_Stream.Flush();
return(true);
}
/// <summary>
/// 创建文件系统。
/// </summary>
/// <param name="fullPath">要创建的文件系统的完整路径。</param>
/// <param name="access">要创建的文件系统的访问方式。</param>
/// <param name="stream">要创建的文件系统的文件系统流。</param>
/// <param name="maxFileCount">要创建的文件系统的最大文件数量。</param>
/// <param name="maxBlockCount">要创建的文件系统的最大块数据数量。</param>
/// <returns>创建的文件系统。</returns>
public static FileSystem Create(string fullPath, FileSystemAccess access, FileSystemStream stream, int maxFileCount, int maxBlockCount)
{
if (maxFileCount <= 0)
{
throw new GameFrameworkException("Max file count is invalid.");
}
if (maxBlockCount <= 0)
{
throw new GameFrameworkException("Max block count is invalid.");
}
if (maxFileCount > maxBlockCount)
{
throw new GameFrameworkException("Max file count can not larger than max block count.");
}
FileSystem fileSystem = new FileSystem(fullPath, access, stream);
fileSystem.m_HeaderData = new HeaderData(maxFileCount, maxBlockCount);
CalcOffsets(fileSystem);
Utility.Marshal.StructureToBytes(fileSystem.m_HeaderData, HeaderDataSize, s_CachedBytes);
try
{
stream.Write(s_CachedBytes, 0, HeaderDataSize);
stream.SetLength(fileSystem.m_FileDataOffset);
return(fileSystem);
}
catch
{
fileSystem.Shutdown();
return(null);
}
}
