在做通讯相关的数据操作时常常须要用到 byte[] byte 数组替换操作.比方协义转换相关的
如今提供了几种替换的方法
///
/// 二进制数据 操作
///
public class HexUtility
{
///
/// 二进制替换,假设没有替换则返回原数组对像的复本.
///
/// 源数据
/// 须要替换的数据
/// 将要替换成为的数据
public static byte[] Replace(byte[] sourceByteArray, byte[] oldValue, byte[] newValue)
{
//创建新数据多出1字节
int newArrayLen = (int)((newValue.Length / (double)oldValue.Length) * sourceByteArray.Length) + 1;
//得到数组长度
newArrayLen = Math.Max(newArrayLen, sourceByteArray.Length);
//新的最后结果数组
byte[] newByteArray = new byte[newArrayLen];
//新数组的当前索引
int curIndex = 0;
//開始结束
int start = -1;
int end = -1;
//当前查找到的索引
int oldCurindex = 0;
//替换数据替换
for (int x = 0; x < sourceByteArray.Length; x++)
{
//查找要替换的数据
if (sourceByteArray[x] == oldValue[oldCurindex])
{
if (oldCurindex == 0)
{
start = x;
}
if (oldCurindex == oldValue.Length - 1)
{
end = x;
oldCurindex = 0;
}
else
{
oldCurindex++;
}
}
else
{
oldCurindex = 0;
newByteArray[curIndex] = sourceByteArray[x];
curIndex++;
}
//数据查找完毕
if (start != -1 && end != -1)
{
//复制替换数据
Buffer.BlockCopy(newValue, 0, newByteArray, curIndex, newValue.Length);
//计算新数组的偏移量
curIndex += newValue.Length;
//又一次设置须要复制索引的索引
start = end = -1;
}
}
//处理返回结果
byte[] result = null;
if (curIndex != 0)
{
result = new byte[curIndex];
Buffer.BlockCopy(newByteArray, 0, result, 0, result.Length);
}
else
{
result = new byte[sourceByteArray.Length];
Buffer.BlockCopy(sourceByteArray, 0, result, 0, result.Length);
}
return result;
}
///
/// 二进制替换,假设没有替换则返回原数组对像的复本.
///
/// 源数据
/// 须要替换的数据集合
public static byte[] Replace(byte[] sourceByteArray, List replaces)
{
//创建新数据多出1字节
int newArrayLen = (int)((replaces.Sum(p => p.newValue.Length) / (double)replaces.Sum(p => p.oldValue.Length)) * sourceByteArray.Length) + 1;
//得到数组长度
newArrayLen = Math.Max(newArrayLen, sourceByteArray.Length);
//新的最后结果数组
byte[] newByteArray = new byte[newArrayLen];
//新数组的当前索引
int curIndex = 0;
bool find = false;
//替换数据替换
for (int x = 0; x < sourceByteArray.Length; x++)
{
foreach (HexReplaceEntity rep in replaces)
{
//查找要替换的数据
if (sourceByteArray[x] == rep.oldValue[rep.oldCurindex])
{
if (rep.oldCurindex == 0)
{
rep.start = x;
}
if (rep.oldCurindex == rep.oldValue.Length - 1)
{
rep.end = x;
rep.oldCurindex = 0;
}
else
{
rep.oldCurindex++;
}
}
else
{
rep.oldCurindex = 0;
newByteArray[curIndex] = sourceByteArray[x];
find = false;
}
//数据查找完毕
if (rep.start != -1 && rep.end != -1)
{
find = true;
if (rep.newValue.Length >= rep.oldValue.Length)
{
//复制替换数据
Buffer.BlockCopy(rep.newValue, 0, newByteArray, curIndex, rep.newValue.Length);
//计算新数组的偏移量
curIndex += rep.newValue.Length;
}
else
//由大字节替换为少字节时出现了问题
{
curIndex -= rep.end - rep.start;
//复制替换数据
Buffer.BlockCopy(rep.newValue, 0, newByteArray, curIndex, rep.newValue.Length);
//计算新数组的偏移量
curIndex += rep.newValue.Length;
}
//又一次设置须要复制索引的索引
rep.start = rep.end = -1;
break;
}
}
if (!find)
{
curIndex++;
}
}
//处理返回结果
byte[] result = null;
if (curIndex != 0)
{
result = new byte[curIndex];
Buffer.BlockCopy(newByteArray, 0, result, 0, result.Length);
}
else
{
result = new byte[sourceByteArray.Length];
Buffer.BlockCopy(sourceByteArray, 0, result, 0, result.Length);
}
return result;
}
}
///
/// 替换数据实体
///
public class HexReplaceEntity
{
///
/// 须要替换的原始值
///
public byte[] oldValue { get; set; }
///
/// 新值
///
public byte[] newValue { get; set; }
///
/// 默认開始结束标记
///
internal int start = -1;
///
/// 默认開始结束标记
///
internal int end = -1;
//当前查找到的索引
internal int oldCurindex = 0;
}