ICSharpCode.SharpZipLib.Zip.ZipInputStream - Coverage Report

# Summary

Class: | ICSharpCode.SharpZipLib.Zip.ZipInputStream
Assembly: | ICSharpCode.SharpZipLib
File(s): | C:\Users\Neil\Documents\Visual Studio 2015\Projects\icsharpcode\SZL_master\ICSharpCode.SharpZipLib\Zip\ZipInputStream.cs
Covered lines: | 162
Uncovered lines: | 44
Coverable lines: | 206
Total lines: | 610
Line coverage: | 78.6%
Branch coverage: | 67.3%

# Metrics

Method | Cyclomatic Complexity | Sequence Coverage | Branch Coverage
--- | --- | --- | ---
.ctor(...) | 1 | 100 | 100
.ctor(...) | 1 | 0 | 0
GetNextEntry() | 24 | 91.38 | 75.56
ReadDataDescriptor() | 3 | 75 | 60
CompleteCloseEntry(...) | 6 | 90.91 | 81.82
CloseEntry() | 10 | 47.83 | 42.11
ReadByte() | 2 | 75 | 66.67
ReadingNotAvailable(...) | 1 | 0 | 0
ReadingNotSupported(...) | 1 | 0 | 0
InitialRead(...) | 11 | 84 | 80.95
Read(...) | 5 | 100 | 100
BodyRead(...) | 22 | 82.86 | 69.23
Close() | 1 | 100 | 100

# File(s)

## C:\Users\Neil\Documents\Visual Studio 2015\Projects\icsharpcode\SZL_master\ICSharpCode.SharpZipLib\Zip\ZipInputStream.cs

| # | Line |  | Line coverage
--- | --- | --- | --- | ---
|  | `1` |  | `using System;`
|  | `2` |  | `using System.IO;`
|  | `3` |  | `using ICSharpCode.SharpZipLib.Checksum;`
|  | `4` |  | `using ICSharpCode.SharpZipLib.Encryption;`
|  | `5` |  | `using ICSharpCode.SharpZipLib.Zip.Compression;`
|  | `6` |  | `using ICSharpCode.SharpZipLib.Zip.Compression.Streams;`
|  | `7` |  | ``
|  | `8` |  | `namespace ICSharpCode.SharpZipLib.Zip`
|  | `9` |  | `{`
|  | `10` |  | `/// <summary>`
|  | `11` |  | `/// This is an InflaterInputStream that reads the files baseInputStream an zip archive`
|  | `12` |  | `/// one after another. It has a special method to get the zip entry of`
|  | `13` |  | `/// the next file. The zip entry contains information about the file name`
|  | `14` |  | `/// size, compressed size, Crc, etc.`
|  | `15` |  | `/// It includes support for Stored and Deflated entries.`
|  | `16` |  | `/// <br/>`
|  | `17` |  | `/// <br/>Author of the original java version : Jochen Hoenicke`
|  | `18` |  | `/// </summary>`
|  | `19` |  | `///`
|  | `20` |  | `/// <example> This sample shows how to read a zip file`
|  | `21` |  | `/// <code lang="C#">`
|  | `22` |  | `/// using System;`
|  | `23` |  | `/// using System.Text;`
|  | `24` |  | `/// using System.IO;`
|  | `25` |  | `///`
|  | `26` |  | `/// using ICSharpCode.SharpZipLib.Zip;`
|  | `27` |  | `///`
|  | `28` |  | `/// class MainClass`
|  | `29` |  | `/// {`
|  | `30` |  | `/// public static void Main(string[] args)`
|  | `31` |  | `/// {`
|  | `32` |  | `/// using ( ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]))) {`
|  | `33` |  | `///`
|  | `34` |  | `/// ZipEntry theEntry;`
|  | `35` |  | `/// const int size = 2048;`
|  | `36` |  | `/// byte[] data = new byte[2048];`
|  | `37` |  | `///`
|  | `38` |  | `/// while ((theEntry = s.GetNextEntry()) != null) {`
|  | `39` |  | `/// if ( entry.IsFile ) {`
|  | `40` |  | `/// Console.Write("Show contents (y/n) ?");`
|  | `41` |  | `/// if (Console.ReadLine() == "y") {`
|  | `42` |  | `/// while (true) {`
|  | `43` |  | `/// size = s.Read(data, 0, data.Length);`
|  | `44` |  | `/// if (size > 0) {`
|  | `45` |  | `/// Console.Write(new ASCIIEncoding().GetString(data, 0, size));`
|  | `46` |  | `/// } else {`
|  | `47` |  | `/// break;`
|  | `48` |  | `/// }`
|  | `49` |  | `/// }`
|  | `50` |  | `/// }`
|  | `51` |  | `/// }`
|  | `52` |  | `/// }`
|  | `53` |  | `/// }`
|  | `54` |  | `/// }`
|  | `55` |  | `/// }`
|  | `56` |  | `/// </code>`
|  | `57` |  | `/// </example>`
|  | `58` |  | `public class ZipInputStream : InflaterInputStream`
|  | `59` |  | `{`
|  | `60` |  | `#region Instance Fields`
|  | `61` |  | ``
|  | `62` |  | `/// <summary>`
|  | `63` |  | `/// Delegate for reading bytes from a stream.`
|  | `64` |  | `/// </summary>`
|  | `65` |  | `delegate int ReadDataHandler(byte[] b, int offset, int length);`
|  | `66` |  | ``
|  | `67` |  | `/// <summary>`
|  | `68` |  | `/// The current reader this instance.`
|  | `69` |  | `/// </summary>`
|  | `70` |  | `ReadDataHandler internalReader;`
|  | `71` |  | ``
| 57 | `72` |  | `Crc32 crc = new Crc32();`
|  | `73` |  | `ZipEntry entry;`
|  | `74` |  | ``
|  | `75` |  | `long size;`
|  | `76` |  | `int method;`
|  | `77` |  | `int flags;`
|  | `78` |  | `string password;`
|  | `79` |  | `#endregion`
|  | `80` |  | ``
|  | `81` |  | `#region Constructors`
|  | `82` |  | `/// <summary>`
|  | `83` |  | `/// Creates a new Zip input stream, for reading a zip archive.`
|  | `84` |  | `/// </summary>`
|  | `85` |  | `/// <param name="baseInputStream">The underlying <see cref="Stream"/> providing data.</param>`
|  | `86` |  | `public ZipInputStream(Stream baseInputStream)`
| 57 | `87` |  | `: base(baseInputStream, new Inflater(true))`
|  | `88` |  | `{`
| 57 | `89` |  | `internalReader = new ReadDataHandler(ReadingNotAvailable);`
| 57 | `90` |  | `}`
|  | `91` |  | ``
|  | `92` |  | `/// <summary>`
|  | `93` |  | `/// Creates a new Zip input stream, for reading a zip archive.`
|  | `94` |  | `/// </summary>`
|  | `95` |  | `/// <param name="baseInputStream">The underlying <see cref="Stream"/> providing data.</param>`
|  | `96` |  | `/// <param name="bufferSize">Size of the buffer.</param>`
|  | `97` |  | `public ZipInputStream(Stream baseInputStream, int bufferSize)`
| 0 | `98` |  | `: base(baseInputStream, new Inflater(true), bufferSize)`
|  | `99` |  | `{`
| 0 | `100` |  | `internalReader = new ReadDataHandler(ReadingNotAvailable);`
| 0 | `101` |  | `}`
|  | `102` |  | `#endregion`
|  | `103` |  | ``
|  | `104` |  | `/// <summary>`
|  | `105` |  | `/// Optional password used for encryption when non-null`
|  | `106` |  | `/// </summary>`
|  | `107` |  | `/// <value>A password for all encrypted <see cref="ZipEntry">entries </see> in this <see cref="ZipInputStream"/></va`
|  | `108` |  | `public string Password {`
|  | `109` |  | `get {`
| 0 | `110` |  | `return password;`
|  | `111` |  | `}`
|  | `112` |  | `set {`
| 23 | `113` |  | `password = value;`
| 23 | `114` |  | `}`
|  | `115` |  | `}`
|  | `116` |  | ``
|  | `117` |  | ``
|  | `118` |  | `/// <summary>`
|  | `119` |  | `/// Gets a value indicating if there is a current entry and it can be decompressed`
|  | `120` |  | `/// </summary>`
|  | `121` |  | `/// <remarks>`
|  | `122` |  | `/// The entry can only be decompressed if the library supports the zip features required to extract it.`
|  | `123` |  | `/// See the <see cref="ZipEntry.Version">ZipEntry Version</see> property for more details.`
|  | `124` |  | `/// </remarks>`
|  | `125` |  | `public bool CanDecompressEntry {`
|  | `126` |  | `get {`
| 70 | `127` |  | `return (entry != null) && entry.CanDecompress;`
|  | `128` |  | `}`
|  | `129` |  | `}`
|  | `130` |  | ``
|  | `131` |  | `/// <summary>`
|  | `132` |  | `/// Advances to the next entry in the archive`
|  | `133` |  | `/// </summary>`
|  | `134` |  | `/// <returns>`
|  | `135` |  | `/// The next <see cref="ZipEntry">entry</see> in the archive or null if there are no more entries.`
|  | `136` |  | `/// </returns>`
|  | `137` |  | `/// <remarks>`
|  | `138` |  | `/// If the previous entry is still open <see cref="CloseEntry">CloseEntry</see> is called.`
|  | `139` |  | `/// </remarks>`
|  | `140` |  | `/// <exception cref="InvalidOperationException">`
|  | `141` |  | `/// Input stream is closed`
|  | `142` |  | `/// </exception>`
|  | `143` |  | `/// <exception cref="ZipException">`
|  | `144` |  | `/// Password is not set, password is invalid, compression method is invalid,`
|  | `145` |  | `/// version required to extract is not supported`
|  | `146` |  | `/// </exception>`
|  | `147` |  | `public ZipEntry GetNextEntry()`
|  | `148` |  | `{`
| 87 | `149` |  | `if (crc == null) {`
| 0 | `150` |  | `throw new InvalidOperationException("Closed.");`
|  | `151` |  | `}`
|  | `152` |  | ``
| 87 | `153` |  | `if (entry != null) {`
| 14 | `154` |  | `CloseEntry();`
|  | `155` |  | `}`
|  | `156` |  | ``
| 87 | `157` |  | `int header = inputBuffer.ReadLeInt();`
|  | `158` |  | ``
| 87 | `159` |  | `if (header == ZipConstants.CentralHeaderSignature ||`
| 87 | `160` |  | `header == ZipConstants.EndOfCentralDirectorySignature ||`
| 87 | `161` |  | `header == ZipConstants.CentralHeaderDigitalSignature ||`
| 87 | `162` |  | `header == ZipConstants.ArchiveExtraDataSignature ||`
| 87 | `163` |  | `header == ZipConstants.Zip64CentralFileHeaderSignature) {`
|  | `164` |  | `// No more individual entries exist`
| 6 | `165` |  | `Close();`
| 6 | `166` |  | `return null;`
|  | `167` |  | `}`
|  | `168` |  | ``
|  | `169` |  | `// -jr- 07-Dec-2003 Ignore spanning temporary signatures if found`
|  | `170` |  | `// Spanning signature is same as descriptor signature and is untested as yet.`
| 81 | `171` |  | `if ((header == ZipConstants.SpanningTempSignature) || (header == ZipConstants.SpanningSignature)) {`
| 0 | `172` |  | `header = inputBuffer.ReadLeInt();`
|  | `173` |  | `}`
|  | `174` |  | ``
| 81 | `175` |  | `if (header != ZipConstants.LocalHeaderSignature) {`
| 0 | `176` |  | `throw new ZipException("Wrong Local header signature: 0x" + String.Format("{0:X}", header));`
|  | `177` |  | `}`
|  | `178` |  | ``
| 81 | `179` |  | `var versionRequiredToExtract = (short)inputBuffer.ReadLeShort();`
|  | `180` |  | ``
| 81 | `181` |  | `flags = inputBuffer.ReadLeShort();`
| 81 | `182` |  | `method = inputBuffer.ReadLeShort();`
| 81 | `183` |  | `var dostime = (uint)inputBuffer.ReadLeInt();`
| 81 | `184` |  | `int crc2 = inputBuffer.ReadLeInt();`
| 81 | `185` |  | `csize = inputBuffer.ReadLeInt();`
| 81 | `186` |  | `size = inputBuffer.ReadLeInt();`
| 81 | `187` |  | `int nameLen = inputBuffer.ReadLeShort();`
| 81 | `188` |  | `int extraLen = inputBuffer.ReadLeShort();`
|  | `189` |  | ``
| 81 | `190` |  | `bool isCrypted = (flags & 1) == 1;`
|  | `191` |  | ``
| 81 | `192` |  | `byte[] buffer = new byte[nameLen];`
| 81 | `193` |  | `inputBuffer.ReadRawBuffer(buffer);`
|  | `194` |  | ``
| 81 | `195` |  | `string name = ZipConstants.ConvertToStringExt(flags, buffer);`
|  | `196` |  | ``
| 81 | `197` |  | `entry = new ZipEntry(name, versionRequiredToExtract);`
| 81 | `198` |  | `entry.Flags = flags;`
|  | `199` |  | ``
| 81 | `200` |  | `entry.CompressionMethod = (CompressionMethod)method;`
|  | `201` |  | ``
| 81 | `202` |  | `if ((flags & 8) == 0) {`
| 44 | `203` |  | `entry.Crc = crc2 & 0xFFFFFFFFL;`
| 44 | `204` |  | `entry.Size = size & 0xFFFFFFFFL;`
| 44 | `205` |  | `entry.CompressedSize = csize & 0xFFFFFFFFL;`
|  | `206` |  | ``
| 44 | `207` |  | `entry.CryptoCheckValue = (byte)((crc2 >> 24) & 0xff);`
|  | `208` |  | ``
| 44 | `209` |  | `} else {`
|  | `210` |  | ``
|  | `211` |  | `// This allows for GNU, WinZip and possibly other archives, the PKZIP spec`
|  | `212` |  | `// says these values are zero under these circumstances.`
| 37 | `213` |  | `if (crc2 != 0) {`
| 12 | `214` |  | `entry.Crc = crc2 & 0xFFFFFFFFL;`
|  | `215` |  | `}`
|  | `216` |  | ``
| 37 | `217` |  | `if (size != 0) {`
| 37 | `218` |  | `entry.Size = size & 0xFFFFFFFFL;`
|  | `219` |  | `}`
|  | `220` |  | ``
| 37 | `221` |  | `if (csize != 0) {`
| 37 | `222` |  | `entry.CompressedSize = csize & 0xFFFFFFFFL;`
|  | `223` |  | `}`
|  | `224` |  | ``
| 37 | `225` |  | `entry.CryptoCheckValue = (byte)((dostime >> 8) & 0xff);`
|  | `226` |  | `}`
|  | `227` |  | ``
| 81 | `228` |  | `entry.DosTime = dostime;`
|  | `229` |  | ``
|  | `230` |  | `// If local header requires Zip64 is true then the extended header should contain`
|  | `231` |  | `// both values.`
|  | `232` |  | ``
|  | `233` |  | `// Handle extra data if present. This can set/alter some fields of the entry.`
| 81 | `234` |  | `if (extraLen > 0) {`
| 78 | `235` |  | `byte[] extra = new byte[extraLen];`
| 78 | `236` |  | `inputBuffer.ReadRawBuffer(extra);`
| 78 | `237` |  | `entry.ExtraData = extra;`
|  | `238` |  | `}`
|  | `239` |  | ``
| 81 | `240` |  | `entry.ProcessExtraData(true);`
| 81 | `241` |  | `if (entry.CompressedSize >= 0) {`
| 57 | `242` |  | `csize = entry.CompressedSize;`
|  | `243` |  | `}`
|  | `244` |  | ``
| 81 | `245` |  | `if (entry.Size >= 0) {`
| 57 | `246` |  | `size = entry.Size;`
|  | `247` |  | `}`
|  | `248` |  | ``
| 81 | `249` |  | `if (method == (int)CompressionMethod.Stored && (!isCrypted && csize != size || (isCrypted && csize - ZipConstants.`
| 0 | `250` |  | `throw new ZipException("Stored, but compressed != uncompressed");`
|  | `251` |  | `}`
|  | `252` |  | ``
|  | `253` |  | `// Determine how to handle reading of data if this is attempted.`
| 81 | `254` |  | `if (entry.IsCompressionMethodSupported()) {`
| 81 | `255` |  | `internalReader = new ReadDataHandler(InitialRead);`
| 81 | `256` |  | `} else {`
| 0 | `257` |  | `internalReader = new ReadDataHandler(ReadingNotSupported);`
|  | `258` |  | `}`
|  | `259` |  | ``
| 81 | `260` |  | `return entry;`
|  | `261` |  | `}`
|  | `262` |  | ``
|  | `263` |  | `/// <summary>`
|  | `264` |  | `/// Read data descriptor at the end of compressed data.`
|  | `265` |  | `/// </summary>`
|  | `266` |  | `void ReadDataDescriptor()`
|  | `267` |  | `{`
| 5 | `268` |  | `if (inputBuffer.ReadLeInt() != ZipConstants.DataDescriptorSignature) {`
| 0 | `269` |  | `throw new ZipException("Data descriptor signature not found");`
|  | `270` |  | `}`
|  | `271` |  | ``
| 5 | `272` |  | `entry.Crc = inputBuffer.ReadLeInt() & 0xFFFFFFFFL;`
|  | `273` |  | ``
| 5 | `274` |  | `if (entry.LocalHeaderRequiresZip64) {`
| 5 | `275` |  | `csize = inputBuffer.ReadLeLong();`
| 5 | `276` |  | `size = inputBuffer.ReadLeLong();`
| 5 | `277` |  | `} else {`
| 0 | `278` |  | `csize = inputBuffer.ReadLeInt();`
| 0 | `279` |  | `size = inputBuffer.ReadLeInt();`
|  | `280` |  | `}`
| 5 | `281` |  | `entry.CompressedSize = csize;`
| 5 | `282` |  | `entry.Size = size;`
| 5 | `283` |  | `}`
|  | `284` |  | ``
|  | `285` |  | `/// <summary>`
|  | `286` |  | `/// Complete cleanup as the final part of closing.`
|  | `287` |  | `/// </summary>`
|  | `288` |  | `/// <param name="testCrc">True if the crc value should be tested</param>`
|  | `289` |  | `void CompleteCloseEntry(bool testCrc)`
|  | `290` |  | `{`
| 32 | `291` |  | `StopDecrypting();`
|  | `292` |  | ``
| 32 | `293` |  | `if ((flags & 8) != 0) {`
| 5 | `294` |  | `ReadDataDescriptor();`
|  | `295` |  | `}`
|  | `296` |  | ``
| 32 | `297` |  | `size = 0;`
|  | `298` |  | ``
| 32 | `299` |  | `if (testCrc &&`
| 32 | `300` |  | `((crc.Value & 0xFFFFFFFFL) != entry.Crc) && (entry.Crc != -1)) {`
| 0 | `301` |  | `throw new ZipException("CRC mismatch");`
|  | `302` |  | `}`
|  | `303` |  | ``
| 32 | `304` |  | `crc.Reset();`
|  | `305` |  | ``
| 32 | `306` |  | `if (method == (int)CompressionMethod.Deflated) {`
| 25 | `307` |  | `inf.Reset();`
|  | `308` |  | `}`
| 32 | `309` |  | `entry = null;`
| 32 | `310` |  | `}`
|  | `311` |  | ``
|  | `312` |  | `/// <summary>`
|  | `313` |  | `/// Closes the current zip entry and moves to the next one.`
|  | `314` |  | `/// </summary>`
|  | `315` |  | `/// <exception cref="InvalidOperationException">`
|  | `316` |  | `/// The stream is closed`
|  | `317` |  | `/// </exception>`
|  | `318` |  | `/// <exception cref="ZipException">`
|  | `319` |  | `/// The Zip stream ends early`
|  | `320` |  | `/// </exception>`
|  | `321` |  | `public void CloseEntry()`
|  | `322` |  | `{`
| 14 | `323` |  | `if (crc == null) {`
| 0 | `324` |  | `throw new InvalidOperationException("Closed");`
|  | `325` |  | `}`
|  | `326` |  | ``
| 14 | `327` |  | `if (entry == null) {`
| 0 | `328` |  | `return;`
|  | `329` |  | `}`
|  | `330` |  | ``
| 14 | `331` |  | `if (method == (int)CompressionMethod.Deflated) {`
| 9 | `332` |  | `if ((flags & 8) != 0) {`
|  | `333` |  | `// We don't know how much we must skip, read until end.`
| 0 | `334` |  | `byte[] tmp = new byte[4096];`
|  | `335` |  | ``
|  | `336` |  | `// Read will close this entry`
| 0 | `337` |  | `while (Read(tmp, 0, tmp.Length) > 0) {`
|  | `338` |  | `}`
| 0 | `339` |  | `return;`
|  | `340` |  | `}`
|  | `341` |  | ``
| 9 | `342` |  | `csize -= inf.TotalIn;`
| 9 | `343` |  | `inputBuffer.Available += inf.RemainingInput;`
|  | `344` |  | `}`
|  | `345` |  | ``
| 14 | `346` |  | `if ((inputBuffer.Available > csize) && (csize >= 0)) {`
| 14 | `347` |  | `inputBuffer.Available = (int)((long)inputBuffer.Available - csize);`
| 14 | `348` |  | `} else {`
| 0 | `349` |  | `csize -= inputBuffer.Available;`
| 0 | `350` |  | `inputBuffer.Available = 0;`
| 0 | `351` |  | `while (csize != 0) {`
| 0 | `352` |  | `long skipped = Skip(csize);`
|  | `353` |  | ``
| 0 | `354` |  | `if (skipped <= 0) {`
| 0 | `355` |  | `throw new ZipException("Zip archive ends early.");`
|  | `356` |  | `}`
|  | `357` |  | ``
| 0 | `358` |  | `csize -= skipped;`
|  | `359` |  | `}`
|  | `360` |  | `}`
|  | `361` |  | ``
| 14 | `362` |  | `CompleteCloseEntry(false);`
| 14 | `363` |  | `}`
|  | `364` |  | ``
|  | `365` |  | `/// <summary>`
|  | `366` |  | `/// Returns 1 if there is an entry available`
|  | `367` |  | `/// Otherwise returns 0.`
|  | `368` |  | `/// </summary>`
|  | `369` |  | `public override int Available {`
|  | `370` |  | `get {`
| 0 | `371` |  | `return entry != null ? 1 : 0;`
|  | `372` |  | `}`
|  | `373` |  | `}`
|  | `374` |  | ``
|  | `375` |  | `/// <summary>`
|  | `376` |  | `/// Returns the current size that can be read from the current entry if available`
|  | `377` |  | `/// </summary>`
|  | `378` |  | `/// <exception cref="ZipException">Thrown if the entry size is not known.</exception>`
|  | `379` |  | `/// <exception cref="InvalidOperationException">Thrown if no entry is currently available.</exception>`
|  | `380` |  | `public override long Length {`
|  | `381` |  | `get {`
| 0 | `382` |  | `if (entry != null) {`
| 0 | `383` |  | `if (entry.Size >= 0) {`
| 0 | `384` |  | `return entry.Size;`
|  | `385` |  | `} else {`
| 0 | `386` |  | `throw new ZipException("Length not available for the current entry");`
|  | `387` |  | `}`
|  | `388` |  | `} else {`
| 0 | `389` |  | `throw new InvalidOperationException("No current entry");`
|  | `390` |  | `}`
|  | `391` |  | `}`
|  | `392` |  | ``
|  | `393` |  | `}`
|  | `394` |  | ``
|  | `395` |  | `/// <summary>`
|  | `396` |  | `/// Reads a byte from the current zip entry.`
|  | `397` |  | `/// </summary>`
|  | `398` |  | `/// <returns>`
|  | `399` |  | `/// The byte or -1 if end of stream is reached.`
|  | `400` |  | `/// </returns>`
|  | `401` |  | `public override int ReadByte()`
|  | `402` |  | `{`
| 12 | `403` |  | `byte[] b = new byte[1];`
| 12 | `404` |  | `if (Read(b, 0, 1) <= 0) {`
| 0 | `405` |  | `return -1;`
|  | `406` |  | `}`
| 12 | `407` |  | `return b[0] & 0xff;`
|  | `408` |  | `}`
|  | `409` |  | ``
|  | `410` |  | `/// <summary>`
|  | `411` |  | `/// Handle attempts to read by throwing an <see cref="InvalidOperationException"/>.`
|  | `412` |  | `/// </summary>`
|  | `413` |  | `/// <param name="destination">The destination array to store data in.</param>`
|  | `414` |  | `/// <param name="offset">The offset at which data read should be stored.</param>`
|  | `415` |  | `/// <param name="count">The maximum number of bytes to read.</param>`
|  | `416` |  | `/// <returns>Returns the number of bytes actually read.</returns>`
|  | `417` |  | `int ReadingNotAvailable(byte[] destination, int offset, int count)`
|  | `418` |  | `{`
| 0 | `419` |  | `throw new InvalidOperationException("Unable to read from this stream");`
|  | `420` |  | `}`
|  | `421` |  | ``
|  | `422` |  | `/// <summary>`
|  | `423` |  | `/// Handle attempts to read from this entry by throwing an exception`
|  | `424` |  | `/// </summary>`
|  | `425` |  | `int ReadingNotSupported(byte[] destination, int offset, int count)`
|  | `426` |  | `{`
| 0 | `427` |  | `throw new ZipException("The compression method for this entry is not supported");`
|  | `428` |  | `}`
|  | `429` |  | ``
|  | `430` |  | `/// <summary>`
|  | `431` |  | `/// Perform the initial read on an entry which may include`
|  | `432` |  | `/// reading encryption headers and setting up inflation.`
|  | `433` |  | `/// </summary>`
|  | `434` |  | `/// <param name="destination">The destination to fill with data read.</param>`
|  | `435` |  | `/// <param name="offset">The offset to start reading at.</param>`
|  | `436` |  | `/// <param name="count">The maximum number of bytes to read.</param>`
|  | `437` |  | `/// <returns>The actual number of bytes read.</returns>`
|  | `438` |  | `int InitialRead(byte[] destination, int offset, int count)`
|  | `439` |  | `{`
| 70 | `440` |  | `if (!CanDecompressEntry) {`
| 0 | `441` |  | `throw new ZipException("Library cannot extract this entry. Version required is (" + entry.Version + ")");`
|  | `442` |  | `}`
|  | `443` |  | ``
|  | `444` |  | `// Handle encryption if required.`
| 70 | `445` |  | `if (entry.IsCrypted) {`
| 24 | `446` |  | `if (password == null) {`
| 0 | `447` |  | `throw new ZipException("No password set.");`
|  | `448` |  | `}`
|  | `449` |  | ``
|  | `450` |  | `// Generate and set crypto transform...`
| 24 | `451` |  | `var managed = new PkzipClassicManaged();`
| 24 | `452` |  | `byte[] key = PkzipClassic.GenerateKeys(ZipConstants.ConvertToArray(password));`
|  | `453` |  | ``
| 24 | `454` |  | `inputBuffer.CryptoTransform = managed.CreateDecryptor(key, null);`
|  | `455` |  | ``
| 24 | `456` |  | `byte[] cryptbuffer = new byte[ZipConstants.CryptoHeaderSize];`
| 24 | `457` |  | `inputBuffer.ReadClearTextBuffer(cryptbuffer, 0, ZipConstants.CryptoHeaderSize);`
|  | `458` |  | ``
| 24 | `459` |  | `if (cryptbuffer[ZipConstants.CryptoHeaderSize - 1] != entry.CryptoCheckValue) {`
| 0 | `460` |  | `throw new ZipException("Invalid password");`
|  | `461` |  | `}`
|  | `462` |  | ``
| 24 | `463` |  | `if (csize >= ZipConstants.CryptoHeaderSize) {`
| 13 | `464` |  | `csize -= ZipConstants.CryptoHeaderSize;`
| 24 | `465` |  | `} else if ((entry.Flags & (int)GeneralBitFlags.Descriptor) == 0) {`
| 0 | `466` |  | `throw new ZipException(string.Format("Entry compressed size {0} too small for encryption", csize));`
|  | `467` |  | `}`
|  | `468` |  | `} else {`
| 46 | `469` |  | `inputBuffer.CryptoTransform = null;`
|  | `470` |  | `}`
|  | `471` |  | ``
| 70 | `472` |  | `if ((csize > 0) || ((flags & (int)GeneralBitFlags.Descriptor) != 0)) {`
| 69 | `473` |  | `if ((method == (int)CompressionMethod.Deflated) && (inputBuffer.Available > 0)) {`
| 66 | `474` |  | `inputBuffer.SetInflaterInput(inf);`
|  | `475` |  | `}`
|  | `476` |  | ``
| 69 | `477` |  | `internalReader = new ReadDataHandler(BodyRead);`
| 69 | `478` |  | `return BodyRead(destination, offset, count);`
|  | `479` |  | `} else {`
| 1 | `480` |  | `internalReader = new ReadDataHandler(ReadingNotAvailable);`
| 1 | `481` |  | `return 0;`
|  | `482` |  | `}`
|  | `483` |  | `}`
|  | `484` |  | ``
|  | `485` |  | `/// <summary>`
|  | `486` |  | `/// Read a block of bytes from the stream.`
|  | `487` |  | `/// </summary>`
|  | `488` |  | `/// <param name="buffer">The destination for the bytes.</param>`
|  | `489` |  | `/// <param name="offset">The index to start storing data.</param>`
|  | `490` |  | `/// <param name="count">The number of bytes to attempt to read.</param>`
|  | `491` |  | `/// <returns>Returns the number of bytes read.</returns>`
|  | `492` |  | `/// <remarks>Zero bytes read means end of stream.</remarks>`
|  | `493` |  | `public override int Read(byte[] buffer, int offset, int count)`
|  | `494` |  | `{`
| 148 | `495` |  | `if (buffer == null) {`
| 1 | `496` |  | `throw new ArgumentNullException(nameof(buffer));`
|  | `497` |  | `}`
|  | `498` |  | ``
| 147 | `499` |  | `if (offset < 0) {`
| 1 | `500` |  | `throw new ArgumentOutOfRangeException(nameof(offset), "Cannot be negative");`
|  | `501` |  | `}`
|  | `502` |  | ``
| 146 | `503` |  | `if (count < 0) {`
| 1 | `504` |  | `throw new ArgumentOutOfRangeException(nameof(count), "Cannot be negative");`
|  | `505` |  | `}`
|  | `506` |  | ``
| 145 | `507` |  | `if ((buffer.Length - offset) < count) {`
| 3 | `508` |  | `throw new ArgumentException("Invalid offset/count combination");`
|  | `509` |  | `}`
|  | `510` |  | ``
| 142 | `511` |  | `return internalReader(buffer, offset, count);`
|  | `512` |  | `}`
|  | `513` |  | ``
|  | `514` |  | `/// <summary>`
|  | `515` |  | `/// Reads a block of bytes from the current zip entry.`
|  | `516` |  | `/// </summary>`
|  | `517` |  | `/// <returns>`
|  | `518` |  | `/// The number of bytes read (this may be less than the length requested, even before the end of stream), or 0 on en`
|  | `519` |  | `/// </returns>`
|  | `520` |  | `/// <exception name="IOException">`
|  | `521` |  | `/// An i/o error occured.`
|  | `522` |  | `/// </exception>`
|  | `523` |  | `/// <exception cref="ZipException">`
|  | `524` |  | `/// The deflated stream is corrupted.`
|  | `525` |  | `/// </exception>`
|  | `526` |  | `/// <exception cref="InvalidOperationException">`
|  | `527` |  | `/// The stream is not open.`
|  | `528` |  | `/// </exception>`
|  | `529` |  | `int BodyRead(byte[] buffer, int offset, int count)`
|  | `530` |  | `{`
| 141 | `531` |  | `if (crc == null) {`
| 0 | `532` |  | `throw new InvalidOperationException("Closed");`
|  | `533` |  | `}`
|  | `534` |  | ``
| 141 | `535` |  | `if ((entry == null) || (count <= 0)) {`
| 46 | `536` |  | `return 0;`
|  | `537` |  | `}`
|  | `538` |  | ``
| 95 | `539` |  | `if (offset + count > buffer.Length) {`
| 0 | `540` |  | `throw new ArgumentException("Offset + count exceeds buffer size");`
|  | `541` |  | `}`
|  | `542` |  | ``
| 95 | `543` |  | `bool finished = false;`
|  | `544` |  | ``
| 95 | `545` |  | `switch (method) {`
|  | `546` |  | `case (int)CompressionMethod.Deflated:`
| 92 | `547` |  | `count = base.Read(buffer, offset, count);`
| 92 | `548` |  | `if (count <= 0) {`
| 16 | `549` |  | `if (!inf.IsFinished) {`
| 0 | `550` |  | `throw new ZipException("Inflater not finished!");`
|  | `551` |  | `}`
| 16 | `552` |  | `inputBuffer.Available = inf.RemainingInput;`
|  | `553` |  | ``
|  | `554` |  | `// A csize of -1 is from an unpatched local header`
| 16 | `555` |  | `if ((flags & 8) == 0 &&`
| 16 | `556` |  | `(inf.TotalIn != csize && csize != 0xFFFFFFFF && csize != -1 || inf.TotalOut != size)) {`
| 0 | `557` |  | `throw new ZipException("Size mismatch: " + csize + ";" + size + " <-> " + inf.TotalIn + ";" + inf.TotalOut`
|  | `558` |  | `}`
| 16 | `559` |  | `inf.Reset();`
| 16 | `560` |  | `finished = true;`
|  | `561` |  | `}`
| 16 | `562` |  | `break;`
|  | `563` |  | ``
|  | `564` |  | `case (int)CompressionMethod.Stored:`
| 3 | `565` |  | `if ((count > csize) && (csize >= 0)) {`
| 0 | `566` |  | `count = (int)csize;`
|  | `567` |  | `}`
|  | `568` |  | ``
| 3 | `569` |  | `if (count > 0) {`
| 3 | `570` |  | `count = inputBuffer.ReadClearTextBuffer(buffer, offset, count);`
| 3 | `571` |  | `if (count > 0) {`
| 3 | `572` |  | `csize -= count;`
| 3 | `573` |  | `size -= count;`
|  | `574` |  | `}`
|  | `575` |  | `}`
|  | `576` |  | ``
| 3 | `577` |  | `if (csize == 0) {`
| 2 | `578` |  | `finished = true;`
| 2 | `579` |  | `} else {`
| 1 | `580` |  | `if (count < 0) {`
| 0 | `581` |  | `throw new ZipException("EOF in stored block");`
|  | `582` |  | `}`
|  | `583` |  | `}`
|  | `584` |  | `break;`
|  | `585` |  | `}`
|  | `586` |  | ``
| 95 | `587` |  | `if (count > 0) {`
| 79 | `588` |  | `crc.Update(buffer, offset, count);`
|  | `589` |  | `}`
|  | `590` |  | ``
| 95 | `591` |  | `if (finished) {`
| 18 | `592` |  | `CompleteCloseEntry(true);`
|  | `593` |  | `}`
|  | `594` |  | ``
| 95 | `595` |  | `return count;`
|  | `596` |  | `}`
|  | `597` |  | ``
|  | `598` |  | `/// <summary>`
|  | `599` |  | `/// Closes the zip input stream`
|  | `600` |  | `/// </summary>`
|  | `601` |  | `public override void Close()`
|  | `602` |  | `{`
| 61 | `603` |  | `internalReader = new ReadDataHandler(ReadingNotAvailable);`
| 61 | `604` |  | `crc = null;`
| 61 | `605` |  | `entry = null;`
|  | `606` |  | ``
| 61 | `607` |  | `base.Close();`
| 61 | `608` |  | `}`
|  | `609` |  | `}`
|  | `610` |  | `}`