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https://github.com/soukoku/ntwain.git
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Moved TWAIN type reading/writing under one class.
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soukoku
249
NTwain/Data/TypeExtensions.cs
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249
NTwain/Data/TypeExtensions.cs
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Runtime.InteropServices;
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namespace NTwain.Data
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{
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/// <summary>
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/// Contains extensions for reading/writing TWAIN types from/to pointer.
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/// </summary>
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public static class TypeExtensions
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{
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static readonly IDictionary<ItemType, int> __sizes = new Dictionary<ItemType, int>
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{
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{ItemType.Int8, 1},
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{ItemType.UInt8, 1},
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{ItemType.Int16, 2},
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{ItemType.UInt8, 2},
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{ItemType.Bool, 2},
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{ItemType.Int32, 4},
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{ItemType.UInt32, 4},
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{ItemType.Fix32, 4},
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{ItemType.Frame, 16},
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{ItemType.String32, TwainConst.String32},
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{ItemType.String64, TwainConst.String64},
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{ItemType.String128, TwainConst.String128},
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{ItemType.String255, TwainConst.String255},
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// TODO: find out if it should be fixed 4 bytes or intptr size
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{ItemType.Handle, IntPtr.Size},
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};
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/// <summary>
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/// Gets the byte size of the item type.
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/// </summary>
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/// <param name="type"></param>
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/// <returns></returns>
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public static int GetItemTypeSize(this ItemType type)
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{
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if (__sizes.ContainsKey(type))
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{
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return __sizes[type];
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}
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return 0;
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}
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/// <summary>
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/// Reads a TWAIN value.
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/// </summary>
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/// <param name="baseAddress">The base address.</param>
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/// <param name="offset">The offset.</param>
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/// <param name="type">The TWAIN type.</param>
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/// <returns></returns>
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1045:DoNotPassTypesByReference", MessageId = "1#")]
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public static object ReadValue(this IntPtr baseAddress, ref int offset, ItemType type)
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{
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object val = null;
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switch (type)
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{
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case ItemType.Int8:
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val = (sbyte)Marshal.ReadByte(baseAddress, offset);
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break;
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case ItemType.UInt8:
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val = Marshal.ReadByte(baseAddress, offset);
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break;
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case ItemType.Bool:
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case ItemType.UInt16:
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val = (ushort)Marshal.ReadInt16(baseAddress, offset);
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break;
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case ItemType.Int16:
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val = Marshal.ReadInt16(baseAddress, offset);
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break;
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case ItemType.UInt32:
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val = (uint)Marshal.ReadInt32(baseAddress, offset);
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break;
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case ItemType.Int32:
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val = Marshal.ReadInt32(baseAddress, offset);
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break;
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case ItemType.Fix32:
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TWFix32 f32 = new TWFix32();
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f32.Whole = Marshal.ReadInt16(baseAddress, offset);
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f32.Fraction = (ushort)Marshal.ReadInt16(baseAddress, offset + 2);
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val = f32;
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break;
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case ItemType.Frame:
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TWFrame frame = new TWFrame();
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frame.Left = (TWFix32)ReadValue(baseAddress, ref offset, ItemType.Fix32);
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frame.Top = (TWFix32)ReadValue(baseAddress, ref offset, ItemType.Fix32);
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frame.Right = (TWFix32)ReadValue(baseAddress, ref offset, ItemType.Fix32);
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frame.Bottom = (TWFix32)ReadValue(baseAddress, ref offset, ItemType.Fix32);
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return frame; // no need to update offset again after reading fix32
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case ItemType.String128:
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case ItemType.String255:
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case ItemType.String32:
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case ItemType.String64:
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val = Marshal.PtrToStringAnsi(new IntPtr(baseAddress.ToInt64() + offset));
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break;
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case ItemType.Handle:
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val = Marshal.ReadIntPtr(baseAddress, offset);
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break;
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}
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offset += GetItemTypeSize(type);
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return val;
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}
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#region writes
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/// <summary>
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/// Writes a TWAIN value.
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/// </summary>
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/// <param name="baseAddr">The base addr.</param>
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/// <param name="offset">The offset.</param>
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/// <param name="type">The TWAIN type.</param>
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/// <param name="value">The value.</param>
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily")]
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public static void WriteValue(this IntPtr baseAddr, ref int offset, ItemType type, object value)
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{
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switch (type)
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{
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case ItemType.Int8:
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case ItemType.UInt8:
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Marshal.WriteByte(baseAddr, offset, Convert.ToByte(value, CultureInfo.InvariantCulture));// (byte)value);
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break;
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case ItemType.Bool:
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case ItemType.Int16:
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case ItemType.UInt16:
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Marshal.WriteInt16(baseAddr, offset, Convert.ToInt16(value, CultureInfo.InvariantCulture));//(short)value);
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break;
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case ItemType.UInt32:
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case ItemType.Int32:
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Marshal.WriteInt32(baseAddr, offset, Convert.ToInt32(value, CultureInfo.InvariantCulture));//(int)value);
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break;
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case ItemType.Fix32:
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TWFix32 f32 = (TWFix32)value;
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Marshal.WriteInt16(baseAddr, offset, f32.Whole);
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if (f32.Fraction > Int16.MaxValue)
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{
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Marshal.WriteInt16(baseAddr, offset + 2, (Int16)(f32.Fraction - 32768));
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}
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else
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{
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Marshal.WriteInt16(baseAddr, offset + 2, (Int16)f32.Fraction);
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}
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break;
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case ItemType.Frame:
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TWFrame frame = (TWFrame)value;
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WriteValue(baseAddr, ref offset, ItemType.Fix32, frame.Left);
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WriteValue(baseAddr, ref offset, ItemType.Fix32, frame.Top);
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WriteValue(baseAddr, ref offset, ItemType.Fix32, frame.Right);
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WriteValue(baseAddr, ref offset, ItemType.Fix32, frame.Bottom);
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return; // no need to update offset for this
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//case ItemType.String1024:
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// WriteString(baseAddr, offset, value as string, 1024);
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// break;
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case ItemType.String128:
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WriteString(baseAddr, offset, (string)value, 128);
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break;
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case ItemType.String255:
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WriteString(baseAddr, offset, (string)value, 255);
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break;
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case ItemType.String32:
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WriteString(baseAddr, offset, (string)value, 32);
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break;
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case ItemType.String64:
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WriteString(baseAddr, offset, (string)value, 64);
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break;
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//case ItemType.Unicode512:
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// WriteUString(baseAddr, offset, value as string, 512);
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// break;
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}
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offset += TypeExtensions.GetItemTypeSize(type);
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}
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/// <summary>
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/// Writes string value. THIS MAY BE WRONG.
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/// </summary>
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/// <param name="baseAddr"></param>
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/// <param name="offset"></param>
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/// <param name="item"></param>
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/// <param name="maxLength"></param>
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static void WriteString(IntPtr baseAddr, int offset, string item, int maxLength)
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{
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if (string.IsNullOrEmpty(item))
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{
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// write zero
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Marshal.WriteByte(baseAddr, offset, 0);
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}
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else
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{
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for (int i = 0; i < maxLength; i++)
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{
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if (i == item.Length)
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{
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// string end reached, so write \0 and quit
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Marshal.WriteByte(baseAddr, offset, 0);
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return;
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}
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else
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{
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Marshal.WriteByte(baseAddr, offset, (byte)item[i]);
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offset++;
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}
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}
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// when ended normally also write \0
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Marshal.WriteByte(baseAddr, offset, 0);
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}
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}
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///// <summary>
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///// Writes unicode string value.
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///// </summary>
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///// <param name="baseAddr"></param>
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///// <param name="offset"></param>
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///// <param name="item"></param>
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///// <param name="maxLength"></param>
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//[EnvironmentPermissionAttribute(SecurityAction.LinkDemand)]
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//private void WriteUString(IntPtr baseAddr, int offset, string item, int maxLength)
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//{
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// if (string.IsNullOrEmpty(item))
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// {
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// // write zero
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// Marshal.WriteInt16(baseAddr, offset, (char)0);
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// }
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// else
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// {
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// // use 2 bytes per char
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// for (int i = 0; i < maxLength; i++)
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// {
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// if (i == item.Length)
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// {
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// // string end reached, so write \0 and quit
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// Marshal.WriteInt16(baseAddr, offset, (char)0);
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// return;
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// }
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// else
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// {
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// Marshal.WriteInt16(baseAddr, offset, item[i]);
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// offset += 2;
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// }
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// }
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// // when ended normally also write \0
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// Marshal.WriteByte(baseAddr, offset, 0);
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// }
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//}
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#endregion
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}
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}
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