/// <summary>
/// 展開準備
/// prepare to inflate
/// </summary>
public void Prepare(byte[] data)
{
_stream = new MemoryStream(data);
//ヘッダ読み取り
//read szip header
{
var binStream = new BinaryReader(_stream);
_header = new SZipHeader();
_header.Read(binStream);
}
//各コンテンツ情報読み取り
//read each content information
{
//要素情報テーブル解凍
_stream.Seek(SZipHeader.Size, SeekOrigin.Begin);
var decompressed = SZipUtility.ZlibDecompress(_stream,
SZipContent.Size * _header.ContentCount,
_header.CompressedContentHeaderTableSize);
_contents = new SZipContent[_header.ContentCount];
using (MemoryStream stream = new MemoryStream(decompressed))
{
for (int contentIndex = 0; contentIndex < _header.ContentCount; contentIndex++)
{
var content = new SZipContent();
content.Read(new BinaryReader(stream));
_contents[contentIndex] = content;
}
}
}
//要素名読み取り
//read each content name
{
//要素名前テーブル解凍
_stream.Seek(SZipHeader.Size + _header.CompressedContentHeaderTableSize, SeekOrigin.Begin);
var decompressed = SZipUtility.ZlibDecompress(_stream, (int)_header.OriginalContentNameTableSize, (int)_header.CompressedContentNameTableSize);
_fileNameTable = new string[_header.ContentCount];
_contentNameHashSet = new HashSet <string>();
using (MemoryStream fnameStream = new MemoryStream(decompressed))
{
using (BinaryReader binReader = new BinaryReader(fnameStream))
{
for (int contentIndex = 0; contentIndex < _header.ContentCount; contentIndex++)
{
int length = (int)_contents[contentIndex].NameByteSize;
var from = binReader.ReadBytes(length);
var contentName = System.Text.Encoding.UTF8.GetString(from);
_fileNameTable[contentIndex] = contentName;
}
}
}
}
}
/// <summary>
/// 圧縮
/// </summary>
public byte[] Deflate()
{
//データ部圧縮
//compress datas
List <int> originalContentDataSizeTable = new List <int>();
List <byte[]> compressedContentDataTable = new List <byte[]>(_contentFileInfoTable.Count);
int compressedContentDataTableSize = 0;
for (int contentIndex = 0; contentIndex < _contentFileInfoTable.Count; contentIndex++)
{
var fileInfo = _contentFileInfoTable[contentIndex];
var data = System.IO.File.ReadAllBytes(fileInfo.FullName);
originalContentDataSizeTable.Add(data.Length);
var compressed = ZlibStream.CompressBuffer(data);
compressedContentDataTableSize += compressed.Length;
compressedContentDataTable.Add(compressed);
}
//ファイル名部圧縮
//compress name table
byte[] compressedContentNameTable = null;
int compressedContentNameTableSize = 0;
{
//全ファイル名結合
System.Text.StringBuilder builder = new System.Text.StringBuilder();
foreach (var s in _contentNameTable)
{
builder.Append(s);
compressedContentNameTableSize += System.Text.Encoding.UTF8.GetByteCount(s);
}
compressedContentNameTable = ZlibStream.CompressString(builder.ToString());
}
//コンテンツ情報部圧縮
//compress contents
byte[] compressedContentTable = null;
{
byte[] headerTable = new byte[SZipContent.Size * _contentFileInfoTable.Count];
using (MemoryStream stream = new MemoryStream(headerTable))
{
using (BinaryWriter writer = new BinaryWriter(stream))
{
for (int contentIndex = 0; contentIndex < _contentFileInfoTable.Count; contentIndex++)
{
var content = new SZipContent();
System.UInt32 crc = SZipUtility.FNVHash(compressedContentDataTable[contentIndex]);
content.Set(_contentNameTable[contentIndex].Length,
originalContentDataSizeTable[contentIndex],
compressedContentDataTable[contentIndex].Length,
crc);
content.Write(writer);
}
}
}
compressedContentTable = ZlibStream.CompressBuffer(headerTable);
}
//ヘッダ生成
//create szip header
var header = new SZipHeader();
header.Set((System.Int16)_contentFileInfoTable.Count,
SZipUtility.FNVHash(compressedContentNameTable),
SZipUtility.FNVHash(compressedContentTable),
compressedContentTable.Length,
compressedContentNameTableSize,
compressedContentNameTable.Length);
//書き込み
//write to byte[]
{
int totalSize = SZipHeader.Size
+ compressedContentTable.Length
+ compressedContentNameTable.Length
+ compressedContentDataTableSize;
byte[] output = new byte[totalSize];
using (MemoryStream stream = new MemoryStream(output))
{
using (BinaryWriter writer = new BinaryWriter(stream))
{
//ヘッダ
header.Write(writer);
//コンテンツ
writer.Write(compressedContentTable);
//コンテンツ名
writer.Write(compressedContentNameTable);
//データ
foreach (var data in compressedContentDataTable)
{
writer.Write(data);
}
}
}
return(output);
}
}
