public class TeXInputStream extends InputStream
The class that encapsulates TeX specific features of stream reading.
Constructor and Description |
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TeXInputStream(InputStream in)
Creates a new instance.
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Modifier and Type | Method and Description |
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int |
available()
Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream
without blocking by the next invocation of a method for this input stream.
|
void |
close()
Sets the position of the underlying byte array stream to the beginning.
|
void |
mark(int readlimit)
Marks the current position in this input stream.
|
boolean |
markSupported()
Tests if this input stream supports the mark and reset methods.
|
int |
read()
Reads the next byte of data from the input stream.
|
int |
read(byte[] b)
Reads some number of bytes from the input stream and stores them into the buffer array
b . |
int |
read(byte[] b,
int off,
int len)
Reads up to
len bytes of data from the input stream into an array of bytes. |
void |
reset()
Repositions this stream to the position at the time the
mark method was last called on this input stream. |
long |
skip(long n)
Skips over and discards
n bytes of data from this input stream. |
public TeXInputStream(InputStream in)
Creates a new instance.
in
- The Java native InputStream
instance.public int read() throws IOException
Reads the next byte of data from the input stream. The value byte is returned as an int
in the range 0
to 255
.
If no byte is available because the end of the stream has been reached, the value -1
is returned.
This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.
read
in class InputStream
-1
if the end of the stream is reached.IOException
- if an I/O error occurs.public int read(byte[] b) throws IOException
Reads some number of bytes from the input stream and stores them into the buffer array b
. The number of bytes actually read
is returned as an integer. This method blocks until input data is available, end of file is detected, or an exception is thrown.
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.
If no byte is available because the stream is at the end of the file, the value -1
is returned;
otherwise, at least one byte is read and stored into b
.
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,
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]
, leaving elements b[k]
through b[b.length-1]
unaffected.
read
in class InputStream
b
- The buffer into which the data is read.-1
if there is no more data because the end of the stream has been reached.IOException
- if the first byte cannot be read for any reason other than the end of the file, if the input stream has been closed, or if some other I/O error occurs.public int read(byte[] b, int off, int len) throws IOException
Reads up to len
bytes of data from the input stream into an array of bytes. An attempt is made to read as many as len
bytes,
but a smaller number may be read. he number of bytes actually read is returned as an integer.
This method blocks until input data is available, end of file is detected, or an exception is thrown.
If len
is zero, then no bytes are read and 0
is returned; otherwise, there is an attempt to read at least one byte.
If no byte is available because the stream is at end of file, the value -1
is returned; otherwise, at least one byte is read
and stored into b
.
The first byte read is stored into element b[off]
, the next one into b[off+1]
, and so on.
The number of bytes read is, at most, equal to len
. Let k
be the number of bytes actually read;
these bytes will be stored in elements b[off]
through b[off+k-1]
, leaving elements
b[off+k]
through b[off+len-1]
unaffected.
In every case, elements b[0]
through b[off]
and elements b[off+len]
through b[b.length-1]
are unaffected.
read
in class InputStream
b
- The buffer into which the data is read.off
- The start offset in array b at which the data is written.len
- The maximum number of bytes to read.IOException
- if the first byte cannot be read for any reason other than end of file,
or if the input stream has been closed, or if some other I/O error occurs.public int available() throws IOException
Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.
available
in class InputStream
0
when it reaches the end of the input stream.IOException
- if an I/O error occurs.public boolean markSupported()
Tests if this input stream supports the mark and reset methods. Whether or not mark
and
reset
are supported is an invariant property of a particular input stream instance.
markSupported
in class InputStream
true
.public void mark(int readlimit)
Marks the current position in this input stream. A subsequent call to the reset
method repositions this stream
at the last marked position so that subsequent reads re-read the same bytes.
mark
in class InputStream
readlimit
- Tells this input stream to allow that many bytes to be read before the mark position gets invalidated.public void reset() throws IOException
Repositions this stream to the position at the time the mark
method was last called on this input stream.
reset
in class InputStream
IOException
public long skip(long n) throws IOException
Skips over and discards n
bytes of data from this input stream. The skip
method may, for a variety of reasons,
end up skipping over some smaller number of bytes, possibly 0
. This may result from any of a number of conditions;
reaching end of file before n
bytes have been skipped is only one possibility. If n
is negative, no bytes are skipped.
skip
in class InputStream
n
- The number of bytes to be skipped.IOException
- if the stream does not support seek, or if some other I/O error occurs.public void close() throws IOException
Sets the position of the underlying byte array stream to the beginning.
close
in interface Closeable
close
in interface AutoCloseable
close
in class InputStream
IOException
- if an I/O error occurs.Copyright © 2022 Aspose. All Rights Reserved.