diff options
Diffstat (limited to 'libjava/java/util/zip/GZIPInputStream.java')
-rw-r--r-- | libjava/java/util/zip/GZIPInputStream.java | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/libjava/java/util/zip/GZIPInputStream.java b/libjava/java/util/zip/GZIPInputStream.java deleted file mode 100644 index bea5eb38b1d..00000000000 --- a/libjava/java/util/zip/GZIPInputStream.java +++ /dev/null @@ -1,154 +0,0 @@ -// GZIPInputStream.java - Input tiler for reading gzip file. - -/* Copyright (C) 1999 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 java.util.zip; - -import java.io.InputStream; -import java.io.IOException; - -/** - * @author Tom Tromey - * @date May 17, 1999 - */ - -/* Written using on-line Java Platform 1.2 API Specification - * and JCL book. - * Believed complete and correct. - */ - -public class GZIPInputStream extends InflaterInputStream -{ - public static final int GZIP_MAGIC = 0x8b1f; - - public void close () throws IOException - { - // Nothing to do here. - super.close(); - } - - public GZIPInputStream (InputStream istream) throws IOException - { - this (istream, 512); - } - - private final int eof_read () throws IOException - { - int r = in.read(); - if (r == -1) - throw new ZipException ("gzip header corrupted"); - return r & 0xff; - } - - public GZIPInputStream (InputStream istream, int readsize) - throws IOException - { - super (istream, new Inflater (true), readsize); - - // NOTE: header reading code taken from zlib's gzio.c. - - // Read the magic number. - int magic = eof_read () | (eof_read () << 8); - if (magic != GZIP_MAGIC) - throw new ZipException ("gzip header corrupted"); - - int method = eof_read (); - int flags = eof_read (); - // Test from zlib. - if (method != Z_DEFLATED || (flags & RESERVED) != 0) - throw new ZipException ("gzip header corrupted"); - - // Discard time, xflags, OS code. - for (int i = 0; i < 6; ++i) - eof_read (); - - // Skip the extra field. - if ((flags & EXTRA_FIELD) != 0) - { - int len = eof_read () | (eof_read () << 8); - while (len-- != 0) - eof_read (); - } - - if ((flags & ORIG_NAME) != 0) - { - while (true) - { - int c = eof_read (); - if (c == 0) - break; - } - } - - if ((flags & COMMENT) != 0) - { - while (true) - { - int c = eof_read (); - if (c == 0) - break; - } - } - - if ((flags & HEAD_CRC) != 0) - { - // FIXME: consider checking CRC of the header. - eof_read (); - eof_read (); - } - - crc = new CRC32 (); - } - - public int read (byte[] buf, int off, int len) throws IOException - { - if (eos) - return -1; - int r = super.read(buf, off, len); - if (r == -1) - { - eos = true; - int header_crc = read4 (); - if (crc.getValue() != header_crc) - throw new ZipException ("corrupted gzip file"); - // Read final `ISIZE' field. - // FIXME: should we check this length? - read4 (); - return -1; - } - crc.update(buf, off, r); - return r; - } - - private final int read4 () throws IOException - { - int byte0 = in.read(); - int byte1 = in.read(); - int byte2 = in.read(); - int byte3 = in.read(); - if (byte3 < 0) - throw new ZipException (".zip archive ended prematurely"); - return ((byte3 & 0xFF) << 24) + ((byte2 & 0xFF) << 16) - + ((byte1 & 0xFF) << 8) + (byte0 & 0xFF); - } - - // Checksum used by this input stream. - protected CRC32 crc; - - // Indicates whether end-of-stream has been reached. - protected boolean eos; - - // Some constants from zlib. - static final int Z_DEFLATED = 8; - static final int HEAD_CRC = 0x02; - static final int EXTRA_FIELD = 0x04; - static final int ORIG_NAME = 0x08; - static final int COMMENT = 0x10; - static final int RESERVED = 0xe0; -} |