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switch ( indexSize )
{
case 1:
index = unsigned long( *(unsigned char*)pIndexData[i * indexSize] ); break;
case 2:
index = unsigned long( *(unsigned short*)pIndexData[i * indexSize] ); break;
case 4:
index = unsigned long( *(unsigned long*)pIndexData[i * indexSize] ); break;
case 8:
index = unsigned long( *(unsigned long long*)pIndexData[i * indexSize] ); break;
// 因为保证最大的索引大小是8,所以没有启用错误处理模块
}