162 } catch (DataFormatException e) {
163 String s = e.getMessage();
164 throw new ZipException(s != null ? s : "Invalid ZLIB data format");
165 }
166 }
167
168 /**
169 * Returns 0 after EOF has been reached, otherwise always return 1.
170 * <p>
171 * Programs should not count on this method to return the actual number
172 * of bytes that could be read without blocking.
173 *
174 * @return 1 before EOF and 0 after EOF.
175 * @exception IOException if an I/O error occurs.
176 *
177 */
178 public int available() throws IOException {
179 ensureOpen();
180 if (reachEOF) {
181 return 0;
182 } else {
183 return 1;
184 }
185 }
186
187 private byte[] b = new byte[512];
188
189 /**
190 * Skips specified number of bytes of uncompressed data.
191 * @param n the number of bytes to skip
192 * @return the actual number of bytes skipped.
193 * @exception IOException if an I/O error has occurred
194 * @exception IllegalArgumentException if {@code n < 0}
195 */
196 public long skip(long n) throws IOException {
197 if (n < 0) {
198 throw new IllegalArgumentException("negative skip length");
199 }
200 ensureOpen();
201 int max = (int)Math.min(n, Integer.MAX_VALUE);
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162 } catch (DataFormatException e) {
163 String s = e.getMessage();
164 throw new ZipException(s != null ? s : "Invalid ZLIB data format");
165 }
166 }
167
168 /**
169 * Returns 0 after EOF has been reached, otherwise always return 1.
170 * <p>
171 * Programs should not count on this method to return the actual number
172 * of bytes that could be read without blocking.
173 *
174 * @return 1 before EOF and 0 after EOF.
175 * @exception IOException if an I/O error occurs.
176 *
177 */
178 public int available() throws IOException {
179 ensureOpen();
180 if (reachEOF) {
181 return 0;
182 } else if (inf.finished()) {
183 // the end of the compressed data stream has been reached
184 reachEOF = true;
185 return 0;
186 } else {
187 return 1;
188 }
189 }
190
191 private byte[] b = new byte[512];
192
193 /**
194 * Skips specified number of bytes of uncompressed data.
195 * @param n the number of bytes to skip
196 * @return the actual number of bytes skipped.
197 * @exception IOException if an I/O error has occurred
198 * @exception IllegalArgumentException if {@code n < 0}
199 */
200 public long skip(long n) throws IOException {
201 if (n < 0) {
202 throw new IllegalArgumentException("negative skip length");
203 }
204 ensureOpen();
205 int max = (int)Math.min(n, Integer.MAX_VALUE);
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