internal static ZipEntry ReadDirEntry(ZipFile zipfile, Stream stream)
{
var reader = zipfile.CreateReader(stream);
var v = reader.Read <UInt32>();
if (v != ZipConstants.ZipDirEntrySignature)
{
if (v != ZipConstants.EndOfCentralDirectorySignature && v != ZipConstants.ZipEntrySignature)
{
throw new ZipException("0x{0:X8}处签名错误！", stream.Position);
}
return(null);
}
reader.Stream.Position -= 4;
var entry = reader.Read <ZipEntry>();
return(entry);
}
internal static ZipEntry ReadDirEntry(ZipFile zipfile, Stream stream)
{
var reader = zipfile.CreateReader(stream);
if (!reader.Expect(ZipConstants.ZipDirEntrySignature))
{
if (!reader.Expect(
ZipConstants.EndOfCentralDirectorySignature,
//ZipConstants.Zip64EndOfCentralDirectoryRecordSignature,
ZipConstants.ZipEntrySignature))
{
throw new ZipException("0x{0:X8}处签名错误！", stream.Position);
}
return null;
}
var entry = reader.ReadObject<ZipEntry>();
return entry;
}
internal static ZipEntry ReadEntry(ZipFile zipfile, Stream stream, Boolean first, Boolean embedFileData)
{
var reader = zipfile.CreateReader(stream);
// 读取文件头时忽略掉这些字段，这些都是DirEntry的字段
reader.Settings.IgnoreMembers = dirMembers;
// 有时候Zip文件以PK00开头
if (first && reader.Expect(ZipConstants.PackedToRemovableMedia)) reader.ReadBytes(4);
// 验证头部
if (!reader.Expect(ZipConstants.ZipEntrySignature))
{
if (!reader.Expect(ZipConstants.ZipDirEntrySignature, ZipConstants.EndOfCentralDirectorySignature))
throw new ZipException("0x{0:X8}处签名错误！", stream.Position);
return null;
}
var entry = reader.ReadObject<ZipEntry>();
if (entry.IsDirectory) return entry;
// 0长度的实体不要设置数据源
if (entry.CompressedSize > 0)
{
// 是否内嵌文件数据
entry.DataSource = embedFileData ? new ArrayDataSource(stream, (Int32)entry.CompressedSize) : new StreamDataSource(stream, stream.Position, 0);
entry.DataSource.IsCompressed = entry.CompressionMethod != CompressionMethod.Stored;
// 移到文件数据之后，可能是文件头
if (!embedFileData) stream.Seek(entry.CompressedSize, SeekOrigin.Current);
}
// 如果有扩展，则跳过
if (entry.BitField.Has(GeneralBitFlags.Descriptor))
{
//stream.Seek(20, SeekOrigin.Current);
// 在某些只读流中，可能无法回头设置校验和大小，此时可通过描述符在文件内容之后设置
entry.Crc = reader.ReadUInt32();
entry.CompressedSize = reader.ReadUInt32();
entry.UncompressedSize = reader.ReadUInt32();
}
return entry;
}
internal static ZipEntry ReadEntry(ZipFile zipfile, Stream stream, Boolean first, Boolean embedFileData)
{
var reader = zipfile.CreateReader(stream);
// 读取文件头时忽略掉这些字段，这些都是DirEntry的字段
//reader.Settings.IgnoreMembers = dirMembers;
var bn = (reader as Binary);
if (bn != null)
{
bn.IgnoreMembers = dirMembers;
}
// 有时候Zip文件以PK00开头
if (first)
{
if (reader.Read <UInt32>() != ZipConstants.PackedToRemovableMedia)
{
reader.Stream.Position -= 4;
}
}
// 验证头部
var v = reader.Read <UInt32>();
if (v != ZipConstants.ZipEntrySignature)
{
if (v != ZipConstants.ZipDirEntrySignature && v != ZipConstants.EndOfCentralDirectorySignature)
{
throw new ZipException("0x{0:X8}处签名错误！", stream.Position);
}
return(null);
}
reader.Stream.Position -= 4;
var entry = reader.Read <ZipEntry>();
if (entry.IsDirectory)
{
return(entry);
}
// 0长度的实体不要设置数据源
if (entry.CompressedSize > 0)
{
// 是否内嵌文件数据
entry.DataSource = embedFileData ? new ArrayDataSource(stream, (Int32)entry.CompressedSize) : new StreamDataSource(stream, stream.Position, 0);
entry.DataSource.IsCompressed = entry.CompressionMethod != CompressionMethod.Stored;
// 移到文件数据之后，可能是文件头
if (!embedFileData)
{
stream.Seek(entry.CompressedSize, SeekOrigin.Current);
}
}
// 如果有扩展，则跳过
if (entry.BitField.Has(GeneralBitFlags.Descriptor))
{
//stream.Seek(20, SeekOrigin.Current);
// 在某些只读流中，可能无法回头设置校验和大小，此时可通过描述符在文件内容之后设置
entry.Crc = reader.Read <UInt32>();
entry.CompressedSize = reader.Read <UInt32>();
entry.UncompressedSize = reader.Read <UInt32>();
}
return(entry);
}
