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// Copyright 2009-2022 Josh Close
// This file is a part of CsvHelper and is dual licensed under MS-PL and Apache 2.0.
// See LICENSE.txt for details or visit http://www.opensource.org/licenses/ms-pl.html for MS-PL and http://opensource.org/licenses/Apache-2.0 for Apache 2.0.
// https://github.com/JoshClose/CsvHelper
using System;
using System.Text;
using CsvHelper.Configuration;
namespace CsvHelper.TypeConversion
{
/// <summary>
/// Converts a <see cref="T:Byte[]"/> to and from a <see cref="string"/>.
/// </summary>
public class ByteArrayConverter : DefaultTypeConverter
{
private readonly ByteArrayConverterOptions options;
private readonly string HexStringPrefix;
private readonly byte ByteLength;
/// <summary>
/// Creates a new ByteArrayConverter using the given <see cref="ByteArrayConverterOptions"/>.
/// </summary>
/// <param name="options">The options.</param>
public ByteArrayConverter(ByteArrayConverterOptions options = ByteArrayConverterOptions.Hexadecimal | ByteArrayConverterOptions.HexInclude0x)
{
// Defaults to the literal format used by C# for whole numbers, and SQL Server for binary data.
this.options = options;
ValidateOptions();
HexStringPrefix = (options & ByteArrayConverterOptions.HexDashes) == ByteArrayConverterOptions.HexDashes ? "-" : string.Empty;
ByteLength = (options & ByteArrayConverterOptions.HexDashes) == ByteArrayConverterOptions.HexDashes ? (byte)3 : (byte)2;
}
/// <summary>
/// Converts the object to a string.
/// </summary>
/// <param name="value">The object to convert to a string.</param>
/// <param name="row">The <see cref="IWriterRow"/> for the current record.</param>
/// <param name="memberMapData">The <see cref="MemberMapData"/> for the member being written.</param>
/// <returns>The string representation of the object.</returns>
public override string? ConvertToString(object? value, IWriterRow row, MemberMapData memberMapData)
{
if (value is byte[] byteArray)
{
return (options & ByteArrayConverterOptions.Base64) == ByteArrayConverterOptions.Base64
? Convert.ToBase64String(byteArray)
: ByteArrayToHexString(byteArray);
}
return base.ConvertToString(value, row, memberMapData);
}
/// <summary>
/// Converts the string to an object.
/// </summary>
/// <param name="text">The string to convert to an object.</param>
/// <param name="row">The <see cref="IReaderRow"/> for the current record.</param>
/// <param name="memberMapData">The <see cref="MemberMapData"/> for the member being created.</param>
/// <returns>The object created from the string.</returns>
public override object? ConvertFromString(string? text, IReaderRow row, MemberMapData memberMapData)
{
if (text != null)
{
return (options & ByteArrayConverterOptions.Base64) == ByteArrayConverterOptions.Base64
? Convert.FromBase64String(text)
: HexStringToByteArray(text);
}
return base.ConvertFromString(text, row, memberMapData);
}
private string ByteArrayToHexString(byte[] byteArray)
{
var hexString = new StringBuilder();
if ((options & ByteArrayConverterOptions.HexInclude0x) == ByteArrayConverterOptions.HexInclude0x)
{
hexString.Append("0x");
}
if (byteArray.Length >= 1)
{
hexString.Append(byteArray[0].ToString("X2"));
}
for (var i = 1; i < byteArray.Length; i++)
{
hexString.Append(HexStringPrefix + byteArray[i].ToString("X2"));
}
return hexString.ToString();
}
private byte[] HexStringToByteArray(string hex)
{
var has0x = hex.StartsWith("0x");
var length = has0x
? (hex.Length - 1) / ByteLength
: hex.Length + 1 / ByteLength;
var byteArray = new byte[length];
var has0xOffset = has0x ? 1 : 0;
for (var stringIndex = has0xOffset * 2; stringIndex < hex.Length; stringIndex += ByteLength)
{
byteArray[(stringIndex - has0xOffset) / ByteLength] = Convert.ToByte(hex.Substring(stringIndex, 2), 16);
}
return byteArray;
}
private void ValidateOptions()
{
if ((options & ByteArrayConverterOptions.Base64) == ByteArrayConverterOptions.Base64)
{
if ((options & (ByteArrayConverterOptions.HexInclude0x | ByteArrayConverterOptions.HexDashes | ByteArrayConverterOptions.Hexadecimal)) != ByteArrayConverterOptions.None)
{
throw new ConfigurationException($"{nameof(ByteArrayConverter)} must be configured exclusively with HexDecimal options, or exclusively with Base64 options. Was {options.ToString()}")
{
Data = { { "options", options } }
};
}
}
}
}
}
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