public static unsafe SafeHeapBlockHandle Utf16ToUtf8(char *start, char *end)
{
if (start >= end)
{
throw new ArgumentException();
}
var charCount = new IntPtr(end - start).ToInt64();
if (charCount >= Int32.MaxValue)
{
throw new ArgumentException("Size limited to Int32 size.");
}
var encoder = Encoding.UTF8.GetEncoder();
var byteCount = encoder.GetByteCount(start, (int)charCount, true);
var newBlock = HeapAllocStatic.Alloc(byteCount);
var result = encoder.GetBytes(start, (int)charCount, (byte *)newBlock.Pointer.ToPointer(),
byteCount, true);
if (result != byteCount)
{
throw new Exception("Error converting string from UTF16 to UTF8.");
}
return(newBlock);
}
public static unsafe SafeHeapBlockHandle Utf8ToUtf16(byte *start, byte *end)
{
if (start >= end)
{
throw new ArgumentException();
}
var length = new IntPtr(end - start).ToInt64();
if (length >= Int32.MaxValue)
{
throw new ArgumentException("Size limited to Int32 size.");
}
var byteLength = (int)length;
var decoder = Encoding.UTF8.GetDecoder();
var charCount = decoder.GetCharCount(start, byteLength, true);
var newBlock = HeapAllocStatic.Alloc(charCount * sizeof(char));
var result = decoder.GetChars(start, byteLength, (char *)newBlock.Pointer.ToPointer(),
charCount, true);
if (result != charCount)
{
throw new Exception("Error converting UTF8 string to UTF16 string.");
}
return(newBlock);
}
private static SafeHeapBlockHandle ReadFileWorker(SlimFileInfo fileInfo, int trailingByteCount)
{
using (
var fileHandle = NativeMethods.CreateFile(fileInfo.FullPathName.FullName, NativeAccessFlags.GenericRead, FileShare.Read, IntPtr.Zero,
FileMode.Open, 0, IntPtr.Zero)) {
if (fileHandle.IsInvalid)
{
throw new Win32Exception();
}
// Note: We are limited to 2GB files by design.
var len = (int)fileInfo.Length;
var heap = HeapAllocStatic.Alloc(len + trailingByteCount);
var bytesRead = new int[1];
if (!NativeMethods.ReadFile(fileHandle, heap.Pointer, len, bytesRead, null))
{
throw new Win32Exception();
}
if (bytesRead[0] != len)
{
throw new Exception("File read operation didn't read the whole file");
}
return(heap);
}
}
private static SafeHeapBlockHandle ReadFileWorker(SlimFileInfo fileInfo, int trailingByteCount)
{
using (
var fileHandle = NativeMethods.CreateFile(fileInfo.FullPath.Value, NativeAccessFlags.GenericRead, FileShare.Read, IntPtr.Zero,
FileMode.Open, 0, IntPtr.Zero)) {
if (fileHandle.IsInvalid)
{
throw new Win32Exception();
}
// Note: We are limited to 2GB files by design.
int maxLen = Int32.MaxValue - trailingByteCount;
if (fileInfo.Length >= maxLen)
{
Logger.LogWarning("File too big, truncated to {0} bytes", maxLen);
}
var len = (int)Math.Min(maxLen, fileInfo.Length);
var heap = HeapAllocStatic.Alloc(len + trailingByteCount);
var bytesRead = new int[1];
if (!NativeMethods.ReadFile(fileHandle, heap.Pointer, len, bytesRead, null))
{
throw new Win32Exception();
}
if (bytesRead[0] != len)
{
throw new Exception("File read operation didn't read the whole file");
}
return(heap);
}
}
public unsafe void AsciiSearchForVariousPatternsWorks(
long blockByteLength,
string pattern,
NativeMethods.SearchOptions searchOptions,
int patternOccurrenceCount,
int iterationCount)
{
Trace.WriteLine(
string.Format(
"Searching {0} time(s) for pattern \"{1}\" with {2} occurrence(s) in a memory block of {3:n0} bytes.",
iterationCount, pattern, patternOccurrenceCount, blockByteLength));
Assert.IsTrue(iterationCount >= 1);
using (var textBlock = HeapAllocStatic.Alloc(blockByteLength)) {
FillWithNonNulCharacters(textBlock);
SetSearchMatches(textBlock, pattern, patternOccurrenceCount);
using (var search = new AsciiStringSearchStrStr(pattern, searchOptions)) {
var sw = Stopwatch.StartNew();
var matchCount = PerformSearch(textBlock, search, iterationCount);
sw.Stop();
Assert.AreEqual(patternOccurrenceCount, matchCount);
Trace.WriteLine(string.Format(" StrStr: Found {0:n0} occurrence(s) {1} times in {2}s ({3:n0} KB/s.)",
matchCount, iterationCount, sw.Elapsed.TotalSeconds,
ComputeThroughput(sw, blockByteLength, iterationCount)));
}
using (var search = new AsciiStringSearchBoyerMoore(pattern, searchOptions)) {
var sw = Stopwatch.StartNew();
var matchCount = PerformSearch(textBlock, search, iterationCount);
sw.Stop();
Assert.AreEqual(patternOccurrenceCount, matchCount);
Trace.WriteLine(string.Format(" Boyer-Moore: Found {0:n0} occurrence(s) {1} times in {2} s ({3:n0} KB/s.)",
matchCount, iterationCount, sw.Elapsed.TotalSeconds,
ComputeThroughput(sw, blockByteLength, iterationCount)));
}
using (var search = new AsciiStringSearchBndm32(pattern, searchOptions)) {
var sw = Stopwatch.StartNew();
var matchCount = PerformSearch(textBlock, search, iterationCount);
sw.Stop();
Assert.AreEqual(patternOccurrenceCount, matchCount);
Trace.WriteLine(string.Format(" BNDM-32: Found {0:n0} occurrence(s) {1} times in {2} s ({3:n0} KB/s.)",
matchCount, iterationCount, sw.Elapsed.TotalSeconds,
ComputeThroughput(sw, blockByteLength, iterationCount)));
}
using (var search = new AsciiStringSearchBndm64(pattern, searchOptions)) {
var sw = Stopwatch.StartNew();
var matchCount = PerformSearch(textBlock, search, iterationCount);
sw.Stop();
Assert.AreEqual(patternOccurrenceCount, matchCount);
Trace.WriteLine(string.Format(" BNDM-64: Found {0:n0} occurrence(s) {1} times in {2} s ({3:n0} KB/s.)",
matchCount, iterationCount, sw.Elapsed.TotalSeconds,
ComputeThroughput(sw, blockByteLength, iterationCount)));
}
}
}
public void HeapAllocWorks()
{
var block = HeapAllocStatic.Alloc(1024);
block.Close();
}
