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using ByteStream.Utils.Unsafe;

using System;

using System.Runtime.CompilerServices;

using System.Runtime.InteropServices;

using System.Text;

namespace ByteStream

{

public unsafe static class StringHelper

{

private const int StrBufSize = 1024;

/// <summary>

/// Reads a string as a double-byte character set. Each character requires 2 bytes.

/// </summary>

/// <param name="data">The source array.</param>

/// <param name="offset">The offset at which to read.</param>

/// <param name="stringLength">The total length of the string to read.</param>

public static string ReadUTF16(byte[] data, int offset, int stringLength)

{

if (stringLength < 1)

return string.Empty;

if (data == null)

throw new ArgumentNullException(nameof(data));

fixed (byte* ptr = &data[offset])

{

return new string((char*)ptr, 0, stringLength);

}

}

/// <summary>

/// Reads a string as a double-byte character set. Each character requires 2 bytes.

/// </summary>

/// <param name="data">The source memory.</param>

/// <param name="offset">The offset at which to read.</param>

/// <param name="stringLength">The total length of the string to read.</param>

public static string ReadUTF16(IntPtr data, int offset, int stringLength)

{

if (stringLength < 1)

return string.Empty;

if (data == IntPtr.Zero)

throw new ArgumentNullException(nameof(data));

return new string((char*)data, offset, stringLength);

}

/// <summary>

/// Reads a string in ANSI encoding. Each character requires 1 byte.

/// </summary>

/// <param name="bin">The source array.</param>

/// <param name="offset">The offset at which to read.</param>

/// <param name="stringLength">The total length of the string to read.</param>

public static string ReadANSI(byte[] data, int offset, int stringLength)

{

if (stringLength < 1)

return string.Empty;

if (data == null)

throw new ArgumentNullException(nameof(data));

fixed (byte* ptr = data)

{

return new string((sbyte*)ptr, offset, stringLength);

}

}

/// <summary>

/// Reads a string in ANSI encoding. Each character requires 1 byte.

/// </summary>

/// <param name="data">The source memory.</param>

/// <param name="offset">The offset at which to read.</param>

/// <param name="stringLength">The total length of the string to read.</param>

public static string ReadANSI(IntPtr data, int offset, int stringLength)

{

if (stringLength < 1)

return string.Empty;

if (data == IntPtr.Zero)

throw new ArgumentNullException(nameof(data));

return new string((sbyte*)data, offset, stringLength);

}

/// <summary>

/// Writes a string as a double-byte character set. Each character requires 2 bytes.

/// </summary>

/// <param name="dest">The destination byte array.</param>

/// <param name="offset">The current write offset.</param>

/// <param name="value">The value to write to the destination.</param>

public static int WriteUTF16(byte[] dest, int offset, string value)

{

if (dest == null)

throw new ArgumentNullException(nameof(dest));

int length = value.Length * sizeof(char);

fixed (byte* ptr = &dest[offset])

fixed (char* str = value)

{

Buffer.MemoryCopy(str, ptr, length, length);

}

return length;

}

/// <summary>

/// Writes a string as a double-byte character set. Each character requires 2 bytes.

/// Does NOT include the length.

/// </summary>

/// <param name="dest">The destination memory.</param>

/// <param name="offset">The current write offset.</param>

/// <param name="value">The value to write to the destination.</param>

public static int WriteUTF16(IntPtr dest, int offset, string value)

{

if (dest == IntPtr.Zero)

throw new ArgumentNullException(nameof(dest));

for (int i = 0; i < value.Length; i++)

*((char*)dest + offset + i) = value[i];

return value.Length * sizeof(char);

}

/// <summary>

/// Writes a string in ANSI encoding. Each character requires 1 byte.

/// </summary>

/// <param name="dest">The destination byte array.</param>

/// <param name="offset">The current write offset.</param>

/// <param name="value">The value to write to the destination.</param>

public static int WriteANSI(byte[] dest, int offset, string value)

{

if (dest == null)

throw new ArgumentNullException(nameof(dest));

for (int i = 0; i < value.Length; i++)

dest[offset + i] = (byte)value[i];

return value.Length;

}

/// <summary>

/// Writes a string in ANSI encoding. Each character requires 1 byte.

/// Does NOT include the length.

/// </summary>

/// <param name="dest">The destination memory.</param>

/// <param name="offset">The current write offset.</param>

/// <param name="value">The value to write to the destination.</param>

public static int WriteANSI(IntPtr dest, int offset, string value)

{

if (dest == IntPtr.Zero)

throw new ArgumentNullException(nameof(dest));

for (int i = 0; i < value.Length; i++)

*((byte*)dest + offset + i) = (byte)value[i];

return value.Length;

}

/// <summary>

/// Writes a string to the supplied buffer.

/// </summary>

public static int WriteString(byte[] data, int offset, string value, Encoding encoding)

{

if (data == null)

throw new ArgumentNullException(nameof(data));

if ((uint)offset > data.Length)

throw new ArgumentOutOfRangeException(nameof(offset));

return encoding.GetBytes(value, 0, value.Length, data, offset);

}

/// <summary>

/// Writes a string to the supplied buffer.

/// </summary>

/// <param name="dataLength">The length of the supplied buffer.</param>

public static int WriteString(IntPtr data, int offset, int dataLength, string value, Encoding encoding)

{

if (data == IntPtr.Zero)

throw new ArgumentNullException(nameof(data));

if ((uint)offset > dataLength)

throw new ArgumentOutOfRangeException("Offset must be smaller than dataLength");

fixed (char* str = value)

{

return encoding.GetBytes(str, value.Length, ((byte*)data) + offset, dataLength);

}

}

/// <summary>

/// Reads a string from the supplied buffer.

/// </summary>

/// <param name="byteCount">The total length in bytes of the endcoded string.</param>

public static string ReadString(byte[] data, int offset, int byteCount, Encoding encoding)

{

if (byteCount <= 0)

return string.Empty;

if ((uint)offset + byteCount > data.Length)

throw new ArgumentOutOfRangeException("ByteCount + Offset is larger than data length.");

fixed (byte* ptr = data)

{

return ReadString((IntPtr)ptr, offset, byteCount, encoding);

}

}

/// <summary>

/// Reads a string from the supplied buffer.

/// </summary>

/// <param name="byteCount">The total length in bytes of the endcoded string.</param>

public static string ReadString(IntPtr data, int offset, int byteCount, Encoding encoding)

{

return new string((sbyte*)data, offset, byteCount, encoding);

}

}

}