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PORandom Bytes added to an end of a buffer
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copied!<p>I was making a re-creation of some System.IO functions from that class. When I setup a buffer and allocate n number of bytes it'll read bytes to that and then add random bytes to the end of that buffer.</p> <p>For example:</p> <p>My Main:</p> <pre><code>int main(int argc, char *args[]) { SetConsoleTitle(TEXT("Stream Test.")); cout<<"Press any Key to begin reading."; cin.get(); const char* data = File::ReadAllBytes(args[1]); Stream* stream = new Stream(data); char* magic = new char[8]; stream->Read(magic, 0, 8); magic[8] = '\0'; cout<<magic<<endl<<endl; delete[]data; cout<<"Press any key to quit."; cin.get(); return 0; } </code></pre> <p>and here is my System::IO namespace + stream class:</p> <pre><code>namespace System { namespace IO { class File { public: static char* ReadAllBytes(const char *name) { ifstream fl(name, ifstream::in|ifstream::binary); fl.seekg( 0, ifstream::end ); size_t len = fl.tellg(); char* ret = new char[len+1]; ret[len] = '\0'; fl.seekg(0); fl.read(ret, len); fl.close(); return ret; } //not sure of this use yet. static size_t fileSize(const char* filename) { ifstream in(filename, ifstream::in | ifstream::binary); in.seekg(0, ifstream::end); return in.tellg(); } }; class Stream { public: const char *_buffer; __int64 _origin; __int64 _position; __int64 _length; __int64 _capacity; bool _expandable; bool _writable; bool _exposable; bool _isOpen; static const int MemStreamMaxLength = 2147483647; Stream() { InitializeInstanceFields(); } Stream(const char *buffer) { _buffer = buffer; _length = strlen(_buffer); _capacity = _length; _position = 0; _origin = 0; _expandable = false; _writable = true; _exposable = true; _isOpen = true; } int ReadByte() { if (_position >= _length) return -1; return _buffer[_position++]; } void Read(char* &buffer, int offset, int length) { if((_position + offset + length) <= _length) { memcpy( buffer, _buffer + (_position + offset), length ); _position += length; } } private: void InitializeInstanceFields() { _origin = 0; _position = 0; _length = 0; _capacity = 0; _expandable = false; _writable = false; _exposable = false; _isOpen = false; } }; } } </code></pre> <p>This is what ends up happening: <img src="https://i.stack.imgur.com/pGoT9.png" alt="What happens"></p> <p>Can anyone explain why this happens, how I can fix, or anything else? I'm new to C++ so any explanations would help. Also please don't criticize my scripting, I know it may be bad, outdated, deprecated, etc. but I'm open to learning and any helping advice goes for the better. :)</p>

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