/// <summary>
/// 备份原始方法头
/// </summary>
protected virtual void BackupHeader()
{
byte *pTarget = (byte *)_targetPtr.ToPointer();
_backupArray = new byte[_headSize];
for (int i = 0; i < _headSize; i++)
{
if (_proxyPtr != null)
{
_proxyPtr[i] = pTarget[i];
}
_backupArray[i] = pTarget[i];
}
if (_proxyPtr != null)
{
int index = 0;
if (LDasm.CheckShortCall(_proxyPtr, s_jmpBuff.Length, out index))
{
if (!NativeAPI.IsAndroidARM())
{
// 目标地址 = 偏移 + 5 + 指令地址
int oldOffsetAddr = *((int *)(_proxyPtr + index + 1));
long targetAddr = oldOffsetAddr + 5 + (long)_targetPtr + index;
// 因为指令地址发生了改变，所以要重新计算偏移 公式: 偏移 = 目标地址 - 指令地址 - 5
int newOffsetAddr = (int)(targetAddr - ((long)_proxyPtr + index) - 5);
*((int *)(_proxyPtr + index + 1)) = newOffsetAddr;
}
}
}
}
/// <summary>
/// 备份原始方法头
/// </summary>
protected virtual void BackupHeader()
{
byte *pTarget = (byte *)_targetPtr.ToPointer();
_backupArray = new byte[_headSize];
for (int i = 0; i < _headSize; i++)
{
if (_proxyPtr != null)
{
_proxyPtr[i] = pTarget[i];
}
_backupArray[i] = pTarget[i];
}
if (_proxyPtr != null)
{
int index = 0;
if (LDasm.CheckShortCall(_proxyPtr, s_jmpBuff.Length, out index))
{
if (IntPtr.Size == 8)
{
// 目标地址 = 偏移 + 5 + 指令地址
int oldOffsetAddr = *((int *)(_proxyPtr + index + 1));
long targetAddr = oldOffsetAddr + 5 + (long)_targetPtr + index;
fixed(byte *p = &s_jmpBuff[s_addrOffset])
{
IntPtr *ptr = (IntPtr *)p;
*ptr = (IntPtr)targetAddr;
}
// 原来的跳转指令长度为5，现在为 14所以把_headsize 拓宽
_headSize = _headSize - 5 + 14;
for (int i = index; i < 14 + index; i++)
{
_proxyPtr[i] = s_jmpBuff[i - index];
}
}
else
{
// 目标地址 = 偏移 + 5 + 指令地址
int oldOffsetAddr = *((int *)(_proxyPtr + index + 1));
long targetAddr = oldOffsetAddr + 5 + (long)_targetPtr + index;
// 因为指令地址发生了改变，所以要重新计算偏移 公式: 偏移 = 目标地址 - 指令地址 - 5
int newOffsetAddr = (int)(targetAddr - ((long)_proxyPtr + index) - 5);
*((int *)(_proxyPtr + index + 1)) = newOffsetAddr;
}
}
}
}