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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/gnu/java/net/protocol/core/CoreInputStream.java | |
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Diffstat (limited to 'libjava/gnu/java/net/protocol/core/CoreInputStream.java')
-rw-r--r-- | libjava/gnu/java/net/protocol/core/CoreInputStream.java | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/libjava/gnu/java/net/protocol/core/CoreInputStream.java b/libjava/gnu/java/net/protocol/core/CoreInputStream.java new file mode 100644 index 000000000..421bb1c47 --- /dev/null +++ b/libjava/gnu/java/net/protocol/core/CoreInputStream.java @@ -0,0 +1,90 @@ +// Handler.java - URLStreamHandler for core protocol. + +/* Copyright (C) 2001 Free Software Foundation + + This file is part of libgcj. + +This software is copyrighted work licensed under the terms of the +Libgcj License. Please consult the file "LIBGCJ_LICENSE" for +details. */ + +package gnu.java.net.protocol.core; + +import gnu.gcj.Core; +import gnu.gcj.RawData; +import java.io.InputStream; +import java.io.IOException; + +public class CoreInputStream extends InputStream +{ + /* A pointer to the object in memory. */ + protected RawData ptr; + + /* Position of the next byte in core to be read. */ + protected int pos; + + /* The currently marked position in the stream. */ + protected int mark; + + /* The index in core one greater than the last valid character. */ + protected int count; + + private native int unsafeGetByte (long offset); + private native int copyIntoByteArray (byte[] dest, int offset, int numBytes); + + public CoreInputStream (Core core) + { + ptr = core.ptr; + count = core.length; + } + + public synchronized int available() + { + return count - pos; + } + + public synchronized void mark(int readAheadLimit) + { + // readAheadLimit is ignored per Java Class Lib. book, p.220. + mark = pos; + } + + public boolean markSupported() + { + return true; + } + + public synchronized int read() + { + if (pos < count) + return ((int) unsafeGetByte(pos++)) & 0xFF; + return -1; + } + + public synchronized int read(byte[] b, int off, int len) + { + if (pos >= count) + return -1; + + int numBytes = Math.min(count - pos, len); + copyIntoByteArray (b, off, numBytes); + pos += numBytes; + return numBytes; + } + + public synchronized void reset() + { + pos = mark; + } + + public synchronized long skip(long n) + { + // Even though the var numBytes is a long, in reality it can never + // be larger than an int since the result of subtracting 2 positive + // ints will always fit in an int. Since we have to return a long + // anyway, numBytes might as well just be a long. + long numBytes = Math.min ((long) (count - pos), n < 0 ? 0L : n); + pos += numBytes; + return numBytes; + } +} |