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Improved signature lookup #851

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Improved signature lookup #851

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39 changes: 23 additions & 16 deletions src/ICSharpCode.SharpZipLib/Zip/ZipFormat.cs
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
using ICSharpCode.SharpZipLib.Core;
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using ICSharpCode.SharpZipLib.Core;

namespace ICSharpCode.SharpZipLib.Zip
{
Expand Down Expand Up @@ -47,7 +47,7 @@ internal static class ZipFormat
{
// Write the local file header
// TODO: ZipFormat.WriteLocalHeader is not yet used and needs checking for ZipFile and ZipOuptutStream usage
internal static int WriteLocalHeader(Stream stream, ZipEntry entry, out EntryPatchData patchData,
internal static int WriteLocalHeader(Stream stream, ZipEntry entry, out EntryPatchData patchData,
bool headerInfoAvailable, bool patchEntryHeader, long streamOffset, StringCodec stringCodec)
{
patchData = new EntryPatchData();
Expand Down Expand Up @@ -76,7 +76,7 @@ internal static int WriteLocalHeader(Stream stream, ZipEntry entry, out EntryPat
{
if (patchEntryHeader)
patchData.CrcPatchOffset = streamOffset + stream.Position;

stream.WriteLEInt(0); // Crc

if (patchEntryHeader)
Expand Down Expand Up @@ -178,21 +178,28 @@ internal static long LocateBlockWithSignature(Stream stream, int signature, long

long giveUpMarker = Math.Max(pos - maximumVariableData, 0);

// TODO: This loop could be optimized for speed.
// cache part of stream which should be searched for signature
byte[] cache = new byte[(int)(pos - giveUpMarker) + 4];
stream.Seek(giveUpMarker, SeekOrigin.Begin);
stream.Read(cache, 0, cache.Length);
MemoryStream cacheStream = new MemoryStream(cache);

do
{
if (pos < giveUpMarker)
{
return -1;
}
stream.Seek(pos--, SeekOrigin.Begin);
} while (stream.ReadLEInt() != signature);
cacheStream.Seek(pos - giveUpMarker, SeekOrigin.Begin);
pos--;
} while (cacheStream.ReadLEInt() != signature);
stream.Seek(pos + 5, SeekOrigin.Begin);

return stream.Position;
}

/// <inheritdoc cref="WriteZip64EndOfCentralDirectory"/>
public static async Task WriteZip64EndOfCentralDirectoryAsync(Stream stream, long noOfEntries,
public static async Task WriteZip64EndOfCentralDirectoryAsync(Stream stream, long noOfEntries,
long sizeEntries, long centralDirOffset, CancellationToken cancellationToken)
{
await stream.WriteProcToStreamAsync(s => WriteZip64EndOfCentralDirectory(s, noOfEntries, sizeEntries, centralDirOffset), cancellationToken).ConfigureAwait(false);
Expand Down Expand Up @@ -234,11 +241,11 @@ internal static void WriteZip64EndOfCentralDirectory(Stream stream, long noOfEnt
}

/// <inheritdoc cref="WriteEndOfCentralDirectory"/>
public static async Task WriteEndOfCentralDirectoryAsync(Stream stream, long noOfEntries, long sizeEntries,
long start, byte[] comment, CancellationToken cancellationToken)
=> await stream.WriteProcToStreamAsync(s
public static async Task WriteEndOfCentralDirectoryAsync(Stream stream, long noOfEntries, long sizeEntries,
long start, byte[] comment, CancellationToken cancellationToken)
=> await stream.WriteProcToStreamAsync(s
=> WriteEndOfCentralDirectory(s, noOfEntries, sizeEntries, start, comment), cancellationToken).ConfigureAwait(false);

/// <summary>
/// Write the required records to end the central directory.
/// </summary>
Expand All @@ -251,8 +258,8 @@ public static async Task WriteEndOfCentralDirectoryAsync(Stream stream, long no
internal static void WriteEndOfCentralDirectory(Stream stream, long noOfEntries, long sizeEntries, long start, byte[] comment)
{
if (noOfEntries >= 0xffff ||
start >= 0xffffffff ||
sizeEntries >= 0xffffffff)
start >= 0xffffffff ||
sizeEntries >= 0xffffffff)
{
WriteZip64EndOfCentralDirectory(stream, noOfEntries, sizeEntries, start);
}
Expand Down Expand Up @@ -459,7 +466,7 @@ internal static int WriteEndEntry(Stream stream, ZipEntry entry, StringCodec str
byte[] extra = ed.GetEntryData();

byte[] entryComment = !(entry.Comment is null)
? stringCodec.ZipOutputEncoding.GetBytes(entry.Comment)
? stringCodec.ZipOutputEncoding.GetBytes(entry.Comment)
: Empty.Array<byte>();

if (entryComment.Length > 0xffff)
Expand Down Expand Up @@ -533,11 +540,11 @@ internal static void AddExtraDataAES(ZipEntry entry, ZipExtraData extraData)
extraData.AddNewEntry(0x9901);
}

internal static async Task PatchLocalHeaderAsync(Stream stream, ZipEntry entry,
internal static async Task PatchLocalHeaderAsync(Stream stream, ZipEntry entry,
EntryPatchData patchData, CancellationToken ct)
{
var initialPos = stream.Position;

// Update CRC
stream.Seek(patchData.CrcPatchOffset, SeekOrigin.Begin);
await stream.WriteLEIntAsync((int)entry.Crc, ct).ConfigureAwait(false);
Expand Down
8 changes: 4 additions & 4 deletions test/ICSharpCode.SharpZipLib.Tests/Zip/ZipEncryptionHandling.cs
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Original file line number Diff line number Diff line change
@@ -1,9 +1,9 @@
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Tests.TestSupport;
using ICSharpCode.SharpZipLib.Zip;
using NUnit.Framework;
using System;
using System.IO;
using System.Text;
using ICSharpCode.SharpZipLib.Tests.TestSupport;
using System.Threading.Tasks;
using Does = ICSharpCode.SharpZipLib.Tests.TestSupport.Does;

Expand Down Expand Up @@ -117,7 +117,7 @@ public void ZipFileAesRead()
{
var password = "password";

using (var ms = new SingleByteReadingStream())
using (var ms = new MemoryStream() /* SingleByteReadingStream */)
{
WriteEncryptedZipToStream(ms, password, 256);
ms.Seek(0, SeekOrigin.Begin);
Expand Down Expand Up @@ -537,7 +537,7 @@ public void WriteEncryptedZipToStream(Stream stream, int entryCount, string pass
zs.SetLevel(9); // 0-9, 9 being the highest level of compression
zs.Password = password; // optional. Null is the same as not setting. Required if using AES.

for (int i = 0; i < entryCount; i++)
for (int i = 0; i < entryCount; i++)
{
AddEncrypedEntryToStream(zs, $"test-{i}", keySize, compressionMethod);
}
Expand Down