087b7e7abf
This code was not tested and breaks in Release builds, reverting to restore
functionality of the nightly. All in-game menus do not work and generating
a world crashes.
This reverts commit a9be52c41a.
118 lines
4.5 KiB
C++
118 lines
4.5 KiB
C++
#include "stdafx.h"
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#include "InputOutputStream.h"
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//Creates ByteArrayInputStream that uses buf as its buffer array. The initial value of pos is offset and
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//the initial value of count is the minimum of offset+length and buf.length. The buffer array is not copied.
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//The buffer's mark is set to the specified offset.
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//Parameters:
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//buf - the input buffer.
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//offset - the offset in the buffer of the first byte to read.
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//length - the maximum number of bytes to read from the buffer.
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ByteArrayInputStream::ByteArrayInputStream(byteArray buf, unsigned int offset, unsigned int length)
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: pos( offset ), count( min( offset+length, buf.length ) ), mark( offset )
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{
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this->buf = buf;
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}
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//Creates a ByteArrayInputStream so that it uses buf as its buffer array. The buffer array is not copied.
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//The initial value of pos is 0 and the initial value of count is the length of buf.
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//Parameters:
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//buf - the input buffer.
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ByteArrayInputStream::ByteArrayInputStream(byteArray buf)
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: pos( 0 ), count( buf.length ), mark( 0 )
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{
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this->buf = buf;
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}
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//Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255.
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//If no byte is available because the end of the stream has been reached, the value -1 is returned.
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//This read method cannot block.
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//Returns:
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//the next byte of data, or -1 if the end of the stream has been reached.
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int ByteArrayInputStream::read()
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{
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if( pos >= count )
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return -1;
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else
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return buf[pos++];
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}
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//Reads some number of bytes from the input stream and stores them into the buffer array b.
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//The number of bytes actually read is returned as an integer. This method blocks until input data is available,
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//end of file is detected, or an exception is thrown.
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//If the length of b is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte.
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//If no byte is available because the stream is at the end of the file, the value -1 is returned; otherwise,
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//at least one byte is read and stored into b.
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//
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//The first byte read is stored into element b[0], the next one into b[1], and so on. The number of bytes read is,
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//at most, equal to the length of b. Let k be the number of bytes actually read; these bytes will be stored in elements b[0] through b[k-1],
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//leaving elements b[k] through b[b.length-1] unaffected.
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//
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//The read(b) method for class InputStream has the same effect as:
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//
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// read(b, 0, b.length)
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//Parameters:
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//b - the buffer into which the data is read.
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//Returns:
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//the total number of bytes read into the buffer, or -1 is there is no more data because the end of the stream has been reached.
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int ByteArrayInputStream::read(byteArray b)
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{
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return read( b, 0, b.length );
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}
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//Reads up to len bytes of data into an array of bytes from this input stream. If pos equals count,
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//then -1 is returned to indicate end of file. Otherwise, the number k of bytes read is equal to the smaller of len and count-pos.
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//If k is positive, then bytes buf[pos] through buf[pos+k-1] are copied into b[off] through b[off+k-1] in the manner
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//performed by System.arraycopy. The value k is added into pos and k is returned.
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//This read method cannot block.
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//Parameters:
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//b - the buffer into which the data is read.
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//off - the start offset in the destination array b
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//len - the maximum number of bytes read.
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//Returns:
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//the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
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int ByteArrayInputStream::read(byteArray b, unsigned int offset, unsigned int length)
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{
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if( pos == count )
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return -1;
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int k = min( length, count-pos );
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XMemCpy( &b[offset], &buf[pos], k );
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//std::copy( buf->data+pos, buf->data+pos+k, b->data + offset ); // Or this instead?
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pos += k;
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return k;
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}
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//Closing a ByteArrayInputStream has no effect.
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//The methods in this class can be called after the stream has been closed without generating an IOException.
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void ByteArrayInputStream::close()
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{
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return;
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}
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//Skips n bytes of input from this input stream. Fewer bytes might be skipped if the end of the input stream is reached. The actual number k of bytes to be skipped is equal to the smaller of n and count-pos. The value k is added into pos and k is returned.
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//Overrides:
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//skip in class InputStream
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//Parameters:
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//n - the number of bytes to be skipped.
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//Returns:
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//the actual number of bytes skipped.
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int64_t ByteArrayInputStream::skip(int64_t n)
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{
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int newPos = pos + n;
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if(newPos > count) newPos = count;
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int k = newPos - pos;
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pos = newPos;
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return k;
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}
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ByteArrayInputStream::~ByteArrayInputStream()
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{
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if(buf.data != NULL) delete [] buf.data;
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} |