ByteArray ByteArray::fromFile(const std::wstring& fileName, int start, int size)
{
ByteArray ret;
FILE* input = openFile(fileName,OpenFileMode::ReadBinary);
if (input == NULL)
return ret;
fseek(input,0,SEEK_END);
int fileSize = ftell(input);
if (start >= fileSize)
{
fclose(input);
return ret;
}
if (size == -1 || start+size > fileSize)
size = fileSize-start;
fseek(input,start,SEEK_SET);
ret.grow(size);
ret.size_ = size;
fread(ret.data(),1,size,input);
fclose(input);
return ret;
}
ByteArray ByteArray::mid(int start, int length)
{
ByteArray ret;
if (length < 0)
length = size_-start;
if (start >= size_)
return ret;
ret.grow(length);
ret.size_ = length;
memcpy(ret.data_,&data_[start],length);
return ret;
}