public static unsafe void ReadFrom(this HGlobalCache <byte> hGCache, Stream stream)
{
int offset = 0;
Loop:
if (offset >= hGCache.Capacity)
{
hGCache.Expand(1218);
}
int readCount = stream.Read(hGCache.Context,
offset,
hGCache.Capacity - offset);
//int readCount = VersionDifferences.ReadBytes(
// stream,
// hGCache.GetPointer() + offset,
// hGCache.Capacity - offset);
offset += readCount;
if (offset == hGCache.Capacity)
{
goto Loop;
}
hGCache.Count = offset;
}
public static async Task ReadFromAsync(this HGlobalCache <byte> hGCache, Stream stream)
{
int offset = 0;
Loop:
if (offset >= hGCache.Capacity)
{
hGCache.Expand(1218);
}
int readCount = await stream.ReadAsync(
hGCache.Context,
offset,
hGCache.Capacity - offset);
offset += readCount;
if (offset == hGCache.Capacity)
{
goto Loop;
}
hGCache.Count = offset;
}
public static unsafe void ReadFrom(this HGlobalCache <char> hGCache, TextReader textReader)
{
int offset = 0;
Loop:
if (offset >= hGCache.Capacity)
{
hGCache.Expand(1218);
}
int readCount = textReader.Read(hGCache.Context,
offset,
hGCache.Capacity - offset);
//int readCount = VersionDifferences.ReadChars(
// textReader,
// hGCache.GetPointer() + offset,
// hGCache.Capacity - offset);
offset += readCount;
if (offset == hGCache.Capacity)
{
goto Loop;
}
hGCache.Count = offset;
}
/// <summary>
/// 将 source 的内容缓存到 HGlobalCache 中。
/// </summary>
/// <param name="hGCache">HGlobalCache</param>
/// <param name="source">source</param>
/// <param name="encoding">编码</param>
/// <returns>返回缓冲的长度</returns>
public static void ReadFrom(this HGlobalCache <char> hGCache, ReadOnlySpan <byte> source, Encoding encoding)
{
var maxCharsCount = encoding.GetMaxCharCount(source.Length);
if (maxCharsCount >= hGCache.Capacity)
{
hGCache.Expand(maxCharsCount);
}
hGCache.Count = encoding.GetChars(source, hGCache);
}
/// <summary>
/// 使用指定哈希算法类型计算字节缓存的哈希值。以十六进制字符串返回。
/// </summary>
/// <typeparam name="THashAlgorithm">哈希算法类型</typeparam>
/// <param name="hGCache">字节缓存</param>
/// <returns>返回 Hash 值的十六进制字符串</returns>
public static string ComputeHash <THashAlgorithm>(this HGlobalCache <byte> hGCache) where THashAlgorithm : HashAlgorithm
{
const int byte_len = 2;
#if NETCOREAPP && !NETCOREAPP2_0
var bytes = ((Span <byte>)hGCache).Slice(hGCache.Count);
var instance = THashAlgorithmInstances <THashAlgorithm> .Instance;
if (hGCache.Capacity - hGCache.Count < instance.HashSize)
{
hGCache.Expand(instance.HashSize);
}
if (instance.TryComputeHash(hGCache, bytes, out var written))
{
bytes = bytes.Slice(0, written);
}
else
{
bytes = instance.ComputeHash(hGCache.Context, 0, hGCache.Count);
}
#else
var bytes = THashAlgorithmInstances <THashAlgorithm> .Instance.ComputeHash(hGCache.Context, 0, hGCache.Count);
#endif
var str = StringHelper.MakeString(bytes.Length * byte_len);
fixed(char *pStr = str)
{
var pStr2 = pStr;
foreach (var item in bytes)
{
NumberHelper.Hex.ToString(item, byte_len, pStr2);
pStr2 += byte_len;
}
}
return(str);
}
/// <summary>
/// 将 source 的内容缓存到 HGlobalCache 中。
/// </summary>
/// <param name="hGCache">HGlobalCache</param>
/// <param name="source">source</param>
/// <param name="encoding">编码</param>
/// <returns>返回缓冲的长度</returns>
public static void ReadFrom(this HGlobalCache <char> hGCache, HGlobalCache <byte> source, Encoding encoding)
{
if (source.Count <= 0)
{
return;
}
var maxCharsCount = encoding.GetMaxCharCount(source.Count);
if (maxCharsCount >= hGCache.Capacity)
{
hGCache.Expand(maxCharsCount);
}
hGCache.Count = encoding.GetChars(
source.GetPointer(),
source.Count,
hGCache.GetPointer(),
hGCache.Capacity);
}
/// <summary>
/// 将 HGlobalCache 中的内容写入到 destination 中。
/// </summary>
/// <param name="hGCache">HGlobalCache</param>
/// <param name="destination">destination</param>
/// <param name="encoding">编码</param>
public static void WriteTo(this HGlobalCache <char> hGCache, HGlobalCache <byte> destination, Encoding encoding)
{
if (hGCache.Count <= 0)
{
return;
}
var maxBytesCount = encoding.GetMaxByteCount(hGCache.Count);
if (maxBytesCount > destination.Capacity)
{
destination.Expand(maxBytesCount - destination.Capacity);
}
destination.Count = encoding.GetBytes(
hGCache.GetPointer(),
hGCache.Count,
destination.GetPointer(),
destination.Capacity);
}
/// <summary>
/// 在字符缓存的后面拼接一个字符串。
/// </summary>
/// <param name="hGCache">字符缓存</param>
/// <param name="value">字符串</param>
/// <returns>返回当前字符缓存</returns>
public static HGlobalCache <char> Append(this HGlobalCache <char> hGCache, string value)
{
var length = value.Length;
if (hGCache.Capacity - hGCache.Count <= length)
{
hGCache.Expand(length + 2);
}
var pointer = hGCache.GetPointer() + hGCache.Count;
for (int i = 0; i < length; ++i)
{
pointer[i] = value[i];
}
hGCache.Count += length;
return(hGCache);
}
/// <summary>
/// 将 source 的内容缓存到 HGlobalCache 中。
/// </summary>
/// <param name="hGCache">HGlobalCache</param>
/// <param name="source">source</param>
/// <param name="encoding">编码</param>
/// <returns>返回缓冲的长度</returns>
public static void ReadFrom(this HGlobalCache <char> hGCache, ArraySegment <byte> source, Encoding encoding)
{
if (source.Count <= 0)
{
return;
}
var maxCharsCount = encoding.GetMaxCharCount(source.Count);
if (maxCharsCount >= hGCache.Capacity)
{
hGCache.Expand(maxCharsCount);
}
fixed(byte *pSource = &source.Array[source.Offset])
{
hGCache.Count = encoding.GetChars(
pSource,
source.Count,
hGCache.GetPointer(),
hGCache.Capacity);
}
}
public static async Task ReadFromAsync(this HGlobalCache <byte> hGCache, Stream stream)
{
int offset = 0;
Loop:
if (offset >= hGCache.Capacity)
{
hGCache.Expand(1218);
}
//IntPtr address;
//unsafe
//{
// address = (IntPtr)(hGCache.GetPointer() + offset);
//}
//int readCount = await VersionDifferences.ReadBytesAsync(
// stream,
// address,
// hGCache.Capacity - offset);
int readCount = await stream.ReadAsync(
hGCache.Context,
offset,
hGCache.Capacity - offset);
offset += readCount;
if (offset == hGCache.Capacity)
{
goto Loop;
}
hGCache.Count = offset;
}
/// <summary>
/// 异步将 Stream 的内容缓存到 HGlobalCache 中。
/// </summary>
/// <param name="hGCache">HGlobalCache</param>
/// <param name="stream">Stream</param>
/// <param name="encoding">编码</param>
/// <returns>返回缓冲的长度</returns>
public static async Task ReadFromAsync(this HGlobalCache <char> hGCache, Stream stream, Encoding encoding)
{
var hGBytes = BytesPool.Rent();
await hGBytes.ReadFromAsync(stream);
var maxCharsCount = encoding.GetMaxCharCount(hGBytes.Count);
if (maxCharsCount > hGCache.Capacity)
{
hGCache.Expand(maxCharsCount - hGCache.Capacity);
}
unsafe
{
hGCache.Count = encoding.GetChars(
hGBytes.GetPointer(),
hGBytes.Count,
hGCache.GetPointer(),
hGCache.Capacity);
}
BytesPool.Return(hGBytes);
}
