4jcraft/Minecraft.World/IO/Streams/ByteArrayOutputStream.cpp

#include "../../Platform/stdafx.h"

#include "ByteArrayOutputStream.h"

// Creates a new byte array output stream. The buffer capacity is initially 32
// bytes, though its size increases if necessary.
ByteArrayOutputStream::ByteArrayOutputStream() {
    count = 0;
    buf = byteArray(32);
}

// Creates a new byte array output stream, with a buffer capacity of the
// specified size, in bytes. Parameters: size - the initial size.
ByteArrayOutputStream::ByteArrayOutputStream(unsigned int size) {
    count = 0;
    buf = byteArray(size);
}

ByteArrayOutputStream::~ByteArrayOutputStream() {
    if (buf.data != nullptr) delete[] buf.data;
}

// Writes the specified byte to this byte array output stream.
// Parameters:
// b - the byte to be written.
void ByteArrayOutputStream::write(unsigned int b) {
    // If we will fill the buffer we need to make it bigger
    if (count + 1 >= buf.length) buf.resize(buf.length * 2);

    buf[count] = (uint8_t)b;
    count++;
}

// Writes b.length bytes from the specified byte array to this output stream.
// The general contract for write(b) is that it should have exactly the same
// effect as the call write(b, 0, b.length).
void ByteArrayOutputStream::write(byteArray b) { write(b, 0, b.length); }

// Writes len bytes from the specified byte array starting at offset off to this
// byte array output stream. Parameters: b - the data. off - the start offset in
// the data. len - the number of bytes to write.
void ByteArrayOutputStream::write(byteArray b, unsigned int offset,
                                  unsigned int length) {
    assert(b.length >= offset + length);

    // If we will fill the buffer we need to make it bigger
    if (count + length >= buf.length)
        buf.resize(std::max(count + length + 1, buf.length * 2));

    XMemCpy(&buf[count], &b[offset], length);
    // std::copy( b->data+offset, b->data+offset+length, buf->data + count ); //
    // Or this instead?

    count += length;
}

// Closing a ByteArrayOutputStream has no effect.
// The methods in this class can be called after the stream has been closed
// without generating an IOException.
void ByteArrayOutputStream::close() {}

// Creates a newly allocated byte array. Its size is the current size of this
// output stream and the valid contents of the buffer have been copied into it.
// Returns:
// the current contents of this output stream, as a byte array.
byteArray ByteArrayOutputStream::toByteArray() {
    byteArray out(count);
    memcpy(out.data, buf.data, count);
    return out;
}