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Added Write method to set string into memory

pull/60/head
David Hall 2019-06-07 10:58:30 -06:00
parent eaa0dd74d3
commit 1c25f88529
1 changed files with 24 additions and 1 deletions
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25
Core/Extensions/StringHelper.cs
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@ -1,6 +1,7 @@
using System;
using System.Runtime.InteropServices;
using System.Security;
using Vanara.InteropServices;
namespace Vanara.Extensions
{
@ -127,7 +128,7 @@ namespace Vanara.Extensions
var ret = new byte[enc.GetByteCount(value) + (nullTerm ? chSz : 0)];
enc.GetBytes(value, 0, value.Length, ret, 0);
if (nullTerm)
enc.GetBytes(new[] {'\0'}, 0, 1, ret, ret.Length - chSz);
enc.GetBytes(new[] { '\0' }, 0, 1, ret, ret.Length - chSz);
return ret;
}
@ -206,6 +207,28 @@ namespace Vanara.Extensions
return s != null;
}
/// <summary>Writes the specified string to a pointer to allocated memory.</summary>
/// <param name="value">The string value.</param>
/// <param name="ptr">The pointer to the allocated memory.</param>
/// <param name="byteCnt">The resulting number of bytes written.</param>
/// <param name="nullTerm">if set to <c>true</c> include a null terminator at the end of the string in the count if <paramref name="value"/> does not equal <c>null</c>.</param>
/// <param name="charSet">The character set of the string.</param>
/// <param name="allocatedBytes">If known, the total number of bytes allocated to the native memory in <paramref name="ptr"/>.</param>
public static void Write(string value, IntPtr ptr, out int byteCnt, bool nullTerm = true, CharSet charSet = CharSet.Auto, long allocatedBytes = long.MaxValue)
{
if (value is null)
{
byteCnt = 0;
return;
}
if (ptr == IntPtr.Zero) throw new ArgumentNullException(nameof(ptr));
var bytes = GetBytes(value, nullTerm, charSet);
if (bytes.Length > allocatedBytes)
throw new ArgumentOutOfRangeException(nameof(allocatedBytes));
byteCnt = bytes.Length;
Marshal.Copy(bytes, 0, ptr, byteCnt);
}
private static bool IsValue(IntPtr ptr) => ptr.ToInt64() >> 16 == 0;
}
}