emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/ManifestInputStream.java
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25 package org.apidesign.bck2brwsr.emul.lang;
27 import java.io.FilterInputStream;
28 import java.io.IOException;
29 import java.io.InputStream;
32 * A fast buffered input stream for parsing manifest files.
34 * Taken from java.util.jar.Manifest.FastInputStream and modified to be
35 * independent of other Manifest functionality.
37 public abstract class ManifestInputStream extends FilterInputStream {
39 private int count = 0;
42 protected ManifestInputStream(InputStream in) {
46 protected ManifestInputStream(InputStream in, int size) {
51 public int read() throws IOException {
58 return buf[pos++] & 0xff;
61 public int read(byte[] b, int off, int len) throws IOException {
62 int avail = count - pos;
64 if (len >= buf.length) {
65 return in.read(b, off, len);
76 System.arraycopy(buf, pos, b, off, len);
82 * Reads 'len' bytes from the input stream, or until an end-of-line
83 * is reached. Returns the number of bytes read.
85 public int readLine(byte[] b, int off, int len) throws IOException {
86 byte[] tbuf = this.buf;
89 int avail = count - pos;
102 int maxpos = tpos + n;
103 while (tpos < maxpos && tbuf[tpos++] != '\n') {
107 System.arraycopy(tbuf, pos, b, off, n);
111 if (tbuf[tpos - 1] == '\n') {
118 public byte peek() throws IOException {
123 return -1; // nothing left in buffer
128 public int readLine(byte[] b) throws IOException {
129 return readLine(b, 0, b.length);
132 public long skip(long n) throws IOException {
136 long avail = count - pos;
147 public int available() throws IOException {
148 return (count - pos) + in.available();
151 public void close() throws IOException {
159 private void fill() throws IOException {
161 int n = in.read(buf, 0, buf.length);
167 protected abstract String putValue(String key, String value);
169 public void readAttributes(byte[] lbuf) throws IOException {
170 ManifestInputStream is = this;
174 byte[] lastline = null;
176 while ((len = is.readLine(lbuf)) != -1) {
177 boolean lineContinued = false;
178 if (lbuf[--len] != '\n') {
179 throw new IOException("line too long");
181 if (len > 0 && lbuf[len - 1] == '\r') {
188 if (lbuf[0] == ' ') {
190 throw new IOException("misplaced continuation line");
192 lineContinued = true;
193 byte[] buf = new byte[lastline.length + len - 1];
194 System.arraycopy(lastline, 0, buf, 0, lastline.length);
195 System.arraycopy(lbuf, 1, buf, lastline.length, len - 1);
196 if (is.peek() == ' ') {
200 value = new String(buf, 0, buf.length, "UTF8");
203 while (lbuf[i++] != ':') {
205 throw new IOException("invalid header field");
208 if (lbuf[i++] != ' ') {
209 throw new IOException("invalid header field");
211 name = new String(lbuf, 0, 0, i - 2);
212 if (is.peek() == ' ') {
213 lastline = new byte[len - i];
214 System.arraycopy(lbuf, i, lastline, 0, len - i);
217 value = new String(lbuf, i, len - i, "UTF8");
220 if ((putValue(name, value) != null) && (!lineContinued)) {
221 throw new IOException("Duplicate name in Manifest: " + name + ".\n" + "Ensure that the manifest does not " + "have duplicate entries, and\n" + "that blank lines separate " + "individual sections in both your\n" + "manifest and in the META-INF/MANIFEST.MF " + "entry in the jar file.");
223 } catch (IllegalArgumentException e) {
224 throw new IOException("invalid header field name: " + name);