/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 2000-2002,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Reader for UCS-2 and UCS-4 encodings.
* (i.e., encodings from ISO-10646-UCS-(2|4)).
*
* @xerces.internal
*
* @author Neil Graham, IBM
*
*/
//
// Constants
//
/** Default byte buffer size (8192, larger than that of ASCIIReader
* since it's reasonable to surmise that the average UCS-4-encoded
* file should be 4 times as large as the average ASCII-encoded file).
*/
//
// Data
//
/** Input stream. */
/** Byte buffer. */
protected byte[] fBuffer;
// what kind of data we're dealing with
protected short fEncoding;
//
// Constructors
//
/**
* Constructs an ASCII reader from the specified input stream
* using the default buffer size. The Endian-ness and whether this is
* UCS-2 or UCS-4 needs also to be known in advance.
*
* @param inputStream The input stream.
* @param encoding One of UCS2LE, UCS2BE, UCS4LE or UCS4BE.
*/
} // <init>(InputStream, short)
/**
* Constructs an ASCII reader from the specified input stream
* and buffer size. The Endian-ness and whether this is
* UCS-2 or UCS-4 needs also to be known in advance.
*
* @param inputStream The input stream.
* @param size The initial buffer size.
* @param encoding One of UCS2LE, UCS2BE, UCS4LE or UCS4BE.
*/
}
} // <init>(InputStream,int,short)
//
// Reader methods
//
/**
* Read a single character. This method will block until a character is
* available, an I/O error occurs, or the end of the stream is reached.
*
* <p> Subclasses that intend to support efficient single-character input
* should override this method.
*
* @return The character read, as an integer in the range 0 to 127
* (<tt>0x00-0x7f</tt>), or -1 if the end of the stream has
* been reached
*
* @exception IOException If an I/O error occurs
*/
if (b0 == 0xff)
return -1;
if (b1 == 0xff)
return -1;
if(fEncoding >=4) {
if (b2 == 0xff)
return -1;
if (b3 == 0xff)
return -1;
System.err.println("b0 is " + (b0 & 0xff) + " b1 " + (b1 & 0xff) + " b2 " + (b2 & 0xff) + " b3 " + (b3 & 0xff));
else
} else { // UCS-2
else
}
} // read():int
/**
* Read characters into a portion of an array. This method will block
* until some input is available, an I/O error occurs, or the end of the
* stream is reached.
*
* @param ch Destination buffer
* @param offset Offset at which to start storing characters
* @param length Maximum number of characters to read
*
* @return The number of characters read, or -1 if the end of the
* stream has been reached
*
* @exception IOException If an I/O error occurs
*/
}
// try and make count be a multiple of the number of bytes we're looking for
// this looks ugly, but it avoids an if at any rate...
for(int i=0; i<numToRead; i++) {
for (int j = i;j<numToRead; j++)
break;
} else {
}
}
} else {
if(numToRead != 0) {
count++;
} else {
}
}
}
// now count is a multiple of the right number of bytes
int curPos = 0;
for (int i = 0; i < numChars; i++) {
if(fEncoding >=4) {
else
} else { // UCS-2
else
}
}
return numChars;
} // read(char[],int,int)
/**
* Skip characters. This method will block until some characters are
* available, an I/O error occurs, or the end of the stream is reached.
*
* @param n The number of characters to skip
*
* @return The number of characters actually skipped
*
* @exception IOException If an I/O error occurs
*/
// charWidth will represent the number of bits to move
// n leftward to get num of bytes to skip, and then move the result rightward
// to get num of chars effectively skipped.
// The trick with &'ing, as with elsewhere in this dcode, is
// intended to avoid an expensive use of / that might not be optimized
// away.
} // skip(long):long
/**
* Tell whether this stream is ready to be read.
*
* @return True if the next read() is guaranteed not to block for input,
* false otherwise. Note that returning false does not guarantee that the
* next read will block.
*
* @exception IOException If an I/O error occurs
*/
return false;
} // ready()
/**
* Tell whether this stream supports the mark() operation.
*/
public boolean markSupported() {
return fInputStream.markSupported();
} // markSupported()
/**
* Mark the present position in the stream. Subsequent calls to reset()
* will attempt to reposition the stream to this point. Not all
* character-input streams support the mark() operation.
*
* @param readAheadLimit Limit on the number of characters that may be
* read while still preserving the mark. After
* reading this many characters, attempting to
* reset the stream may fail.
*
* @exception IOException If the stream does not support mark(),
* or if some other I/O error occurs
*/
} // mark(int)
/**
* Reset the stream. If the stream has been marked, then attempt to
* reposition it at the mark. If the stream has not been marked, then
* attempt to reset it in some way appropriate to the particular stream,
* for example by repositioning it to its starting point. Not all
* character-input streams support the reset() operation, and some support
* reset() without supporting mark().
*
* @exception IOException If the stream has not been marked,
* or if the mark has been invalidated,
* or if the stream does not support reset(),
* or if some other I/O error occurs
*/
} // reset()
/**
* Close the stream. Once a stream has been closed, further read(),
* ready(), mark(), or reset() invocations will throw an IOException.
* Closing a previously-closed stream, however, has no effect.
*
* @exception IOException If an I/O error occurs
*/
} // close()
} // class UCSReader