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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/classpath/gnu/java/net/protocol/ftp/CompressedInputStream.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/net/protocol/ftp/CompressedInputStream.java')
-rw-r--r-- | libjava/classpath/gnu/java/net/protocol/ftp/CompressedInputStream.java | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/net/protocol/ftp/CompressedInputStream.java b/libjava/classpath/gnu/java/net/protocol/ftp/CompressedInputStream.java new file mode 100644 index 000000000..638d780e6 --- /dev/null +++ b/libjava/classpath/gnu/java/net/protocol/ftp/CompressedInputStream.java @@ -0,0 +1,214 @@ +/* CompressedInputStream.java -- + Copyright (C) 2003, 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.net.protocol.ftp; + +import java.io.IOException; +import java.io.InputStream; +import java.net.ProtocolException; + +/** + * A DTP input stream that implements the FTP compressed transfer mode. + * + * @author Chris Burdess (dog@gnu.org) + */ +class CompressedInputStream + extends DTPInputStream +{ + + static final int EOF = 64; + + static final int RAW = 0x00; + static final int COMPRESSED = 0x80; + static final int FILLER = 0xc0; + + int descriptor; + int max = -1; + int count = -1; + + int state = RAW; // RAW | STATE | FILLER + int rep; // the compressed byte + int n = 0; // the number of compressed or raw bytes + + CompressedInputStream(DTP dtp, InputStream in) + { + super(dtp, in); + } + + public int read() + throws IOException + { + if (transferComplete) + { + return -1; + } + if (count == -1) + { + readHeader(); + } + if (max < 1) + { + close(); + return -1; + } + if (n > 0 && (state == COMPRESSED || state == FILLER)) + { + n--; + return rep; + } + int c = in.read(); + if (c == -1) + { + close(); + } + count++; + if (count >= max) + { + count = -1; + if (descriptor == EOF) + { + close(); + } + } + if (c == -1) + { + return c; + } + while (n == 0) // read code header + { + state = (c & 0xc0); + n = (c & 0x3f); + c = in.read(); + if (c == -1) + { + return -1; + } + } + switch (state) + { + case RAW: + break; + case COMPRESSED: + case FILLER: + rep = c; + break; + default: + throw new ProtocolException("Illegal state: " + state); + } + n--; + return c; + } + + public int read(byte[] buf) + throws IOException + { + return read(buf, 0, buf.length); + } + + public int read(byte[] buf, int off, int len) + throws IOException + { + if (transferComplete) + { + return -1; + } + if (count == -1) + { + readHeader(); + } + if (max < 1) + { + close(); + return -1; + } + // TODO improve performance + for (int i = off; i < len; i++) + { + int c = read(); + if (c == -1) + { + close(); + return i; + } + buf[i] = (byte) c; + } + return len; + /* + int l = in.read (buf, off, len); + if (l==-1) + { + close (); + } + count += l; + if (count>=max) + { + count = -1; + if (descriptor==EOF) + { + close (); + } + } + return l; + */ + } + + /** + * Reads the block header. + */ + void readHeader() + throws IOException + { + descriptor = in.read(); + int max_hi = in.read(); + int max_lo = in.read(); + max = (max_hi << 8) | max_lo; + count = 0; + } + + /** + * Reads the code header. + */ + void readCodeHeader() + throws IOException + { + int code = in.read(); + state = (code & 0xc0); + n = (code & 0x3f); + } + +} |