| package org.apache.kerby.util; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * @author Julius Davies |
| * @author 23-Dec-2007 |
| */ |
| public class ReadLine { |
| |
| final InputStream in; |
| final byte[] bytes = new byte[8192]; |
| int pos = 0; |
| int avail = 0; |
| |
| public ReadLine(InputStream in) { |
| this.in = in; |
| } |
| |
| public String next() throws IOException { |
| return next(1); |
| } |
| |
| public String next(int lines) throws IOException { |
| if (lines < 1) { |
| lines = 1; |
| } |
| StringBuffer buf = new StringBuffer(128 * lines); |
| if (avail <= 0 || pos >= avail) { |
| pos = 0; |
| avail = in.read(bytes); |
| } |
| while (avail >= 0) { |
| while (pos < avail) { |
| char c = (char) bytes[pos++]; |
| switch (c) { |
| case '\n': |
| case '\r': |
| lines--; |
| if (lines < 1 && buf.length() > 0) { |
| return buf.toString(); |
| } |
| break; |
| default: |
| buf.append(c); |
| break; |
| } |
| } |
| pos = 0; |
| avail = in.read(bytes); |
| } |
| return buf.length() > 0 ? buf.toString() : null; |
| } |
| |
| public byte[] nextAsBytes() throws IOException { |
| return nextAsBytes(1); |
| } |
| |
| public byte[] nextAsBytes(int lines) throws IOException { |
| if (lines < 1) { |
| lines = 1; |
| } |
| byte[] buf = new byte[8192]; |
| int bufPos = 0; |
| if (avail <= 0 || pos >= avail) { |
| pos = 0; |
| avail = in.read(bytes); |
| } |
| while (avail >= 0) { |
| while (pos < avail) { |
| byte b = bytes[pos++]; |
| switch (b) { |
| case '\n': |
| case '\r': |
| lines--; |
| if (lines == 0 && bufPos > 0) { |
| return buf; |
| } |
| break; |
| default: |
| if (bufPos >= buf.length) { |
| byte[] moreBuff = new byte[buf.length * 2]; |
| System.arraycopy(buf, 0, moreBuff, 0, buf.length); |
| buf = moreBuff; |
| } |
| buf[bufPos++] = b; |
| break; |
| } |
| } |
| pos = 0; |
| avail = in.read(bytes); |
| } |
| return bufPos > 0 ? buf : null; |
| } |
| |
| } |