private static void AddFileToZip(
string fileName,
string relativeDir,
bool keepDirectoryInfo,
FileStream outputStream,
BinaryWriter outputWriter,
BinaryWriter centralDirWriter)
{
fileName = Path.GetFullPath(fileName);
if (!File.Exists(fileName) && !Directory.Exists(fileName))
throw new FileNotFoundException(fileName);
bool isDir = Directory.Exists(fileName);
int uncompressedSize = 0;
int compressedSize = 0;
UInt32 crc32 = 0;
int relativePositionOfThisHeader = 0;
if (isDir)
{
// Write the file header
AppendFileHeader(outputWriter, fileName, 0, 0, 0, relativeDir, keepDirectoryInfo);
}
else
{
byte[] inputReadBuffer = null;
using (MemoryStream compressedStream = new MemoryStream())
{
FileIOPermission readPerm = new FileIOPermission(FileIOPermissionAccess.Read, fileName);
readPerm.Demand();
using (FileStream inputStream = new FileStream(fileName, FileMode.Open))
{
uncompressedSize = (int)inputStream.Length;
// Calculate the CRC32
CRC32 crc = new CRC32();
crc32 = crc.GetCrc32(inputStream);
inputStream.Seek(0, SeekOrigin.Begin);
inputReadBuffer = new byte[uncompressedSize];
// Compress the individual file into a temporary stream
using (DeflateStream deflateStream = new DeflateStream(compressedStream, CompressionMode.Compress, true))
{
int bytesRead = inputStream.Read(inputReadBuffer, 0, inputReadBuffer.Length);
Debug.Assert(bytesRead == uncompressedSize);
deflateStream.Write(inputReadBuffer, 0, inputReadBuffer.Length);
deflateStream.Flush();
}
}
compressedStream.Flush();
compressedStream.Seek(0, SeekOrigin.Begin);
compressedSize = (int)compressedStream.Length;
relativePositionOfThisHeader = (int)outputStream.Position;
// Write the file header
AppendFileHeader(outputWriter, fileName, compressedSize, uncompressedSize, crc32, relativeDir, keepDirectoryInfo);
// Write the compressed data
byte[] buffer = new byte[compressedStream.Length];
compressedStream.Read(buffer, 0, buffer.Length);
#if DEBUG
using (MemoryStream memStr = new MemoryStream())
{
memStr.Write(buffer, 0, buffer.Length);
memStr.Flush();
memStr.Seek(0, SeekOrigin.Begin);
byte[] allContent = null;
using (DeflateStream testUnZip = new DeflateStream(memStr, CompressionMode.Decompress))
using (BinaryReader testRdr = new BinaryReader(testUnZip))
{
allContent = testRdr.ReadBytes(uncompressedSize);
Debug.Assert(allContent.Length == uncompressedSize);
}
for(int i = 0; i < uncompressedSize; i++)
Debug.Assert(allContent[i] == inputReadBuffer[i]);
}
#endif
// Add the compressed data to the output stream
outputStream.Write(buffer, 0, buffer.Length);
}
}
// Write the central dir header
AppendCentralDirHeader(centralDirWriter, fileName, compressedSize, uncompressedSize, crc32, relativePositionOfThisHeader, relativeDir, keepDirectoryInfo);
}