X-Git-Url: http://git.nikiroo.be/?a=blobdiff_plain;f=src%2Fbe%2Fnikiroo%2Futils%2Fstreams%2FReplaceInputStream.java;h=9f733504117c314768603669b73cde0f7aa2ab40;hb=4a464a06db3158e31c64aa798ddce9df1ec7f5f5;hp=5eac0b448fef0262b9f2ded53a4c199a2c41d0b7;hpb=8e76f6ab13a8a4a651f2518b6c91d5e6424c7922;p=nikiroo-utils.git

diff --git a/src/be/nikiroo/utils/streams/ReplaceInputStream.java b/src/be/nikiroo/utils/streams/ReplaceInputStream.java
index 5eac0b4..9f73350 100644
--- a/src/be/nikiroo/utils/streams/ReplaceInputStream.java
+++ b/src/be/nikiroo/utils/streams/ReplaceInputStream.java
@@ -2,17 +2,29 @@ package be.nikiroo.utils.streams;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.UnsupportedEncodingException;
+
+import be.nikiroo.utils.StringUtils;
 
 /**
- * This {@link InputStream} will replace some of its content by replacing it
- * with something else.
+ * This {@link InputStream} will change some of its content by replacing it with
+ * something else.
  * 
  * @author niki
  */
 public class ReplaceInputStream extends BufferedInputStream {
-	private byte[] from;
-	private byte[] to;
+	/**
+	 * The minimum size of the internal buffer (could be more if at least one of
+	 * the 'FROM' bytes arrays is > 2048 bytes — in that case the
+	 * buffer will be twice the largest size of the 'FROM' bytes arrays).
+	 * <p>
+	 * This is a different buffer than the one from the inherited class.
+	 */
+	static private final int MIN_BUFFER_SIZE = 4096;
+
+	private byte[][] froms;
+	private byte[][] tos;
+	private int maxFromSize;
+	private int maxToSize;
 
 	private byte[] source;
 	private int spos;
@@ -30,7 +42,7 @@ public class ReplaceInputStream extends BufferedInputStream {
 	 *            the {@link String} to replace with
 	 */
 	public ReplaceInputStream(InputStream in, String from, String to) {
-		this(in, bytes(from), bytes(to));
+		this(in, StringUtils.getBytes(from), StringUtils.getBytes(to));
 	}
 
 	/**
@@ -45,57 +57,106 @@ public class ReplaceInputStream extends BufferedInputStream {
 	 *            the value to replace with
 	 */
 	public ReplaceInputStream(InputStream in, byte[] from, byte[] to) {
+		this(in, new byte[][] { from }, new byte[][] { to });
+	}
+
+	/**
+	 * Create a {@link ReplaceInputStream} that will replace all <tt>froms</tt>
+	 * with <tt>tos</tt>.
+	 * <p>
+	 * Note that they will be replaced in order, and that for each <tt>from</tt>
+	 * a <tt>to</tt> must correspond.
+	 * 
+	 * @param in
+	 *            the under-laying {@link InputStream}
+	 * @param froms
+	 *            the values to replace
+	 * @param tos
+	 *            the values to replace with
+	 */
+	public ReplaceInputStream(InputStream in, String[] froms, String[] tos) {
+		this(in, StreamUtils.getBytes(froms), StreamUtils.getBytes(tos));
+	}
+
+	/**
+	 * Create a {@link ReplaceInputStream} that will replace all <tt>froms</tt>
+	 * with <tt>tos</tt>.
+	 * <p>
+	 * Note that they will be replaced in order, and that for each <tt>from</tt>
+	 * a <tt>to</tt> must correspond.
+	 * 
+	 * @param in
+	 *            the under-laying {@link InputStream}
+	 * @param froms
+	 *            the values to replace
+	 * @param tos
+	 *            the values to replace with
+	 */
+	public ReplaceInputStream(InputStream in, byte[][] froms, byte[][] tos) {
 		super(in);
-		this.from = from;
-		this.to = to;
 
-		source = new byte[4096];
+		if (froms.length != tos.length) {
+			throw new IllegalArgumentException(
+					"For replacing, each FROM must have a corresponding TO");
+		}
+
+		this.froms = froms;
+		this.tos = tos;
+
+		maxFromSize = 0;
+		for (int i = 0; i < froms.length; i++) {
+			maxFromSize = Math.max(maxFromSize, froms[i].length);
+		}
+
+		maxToSize = 0;
+		for (int i = 0; i < tos.length; i++) {
+			maxToSize = Math.max(maxToSize, tos[i].length);
+		}
+
+		// We need at least maxFromSize so we can iterate and replace
+		source = new byte[Math.max(2 * maxFromSize, MIN_BUFFER_SIZE)];
 		spos = 0;
 		slen = 0;
 	}
 
 	@Override
-	protected int read(InputStream in, byte[] buffer) throws IOException {
-		if (buffer.length < to.length || source.length < to.length * 2) {
+	protected int read(InputStream in, byte[] buffer, int off, int len)
+			throws IOException {
+		if (len < maxToSize || source.length < maxToSize * 2) {
 			throw new IOException(
-					"An underlaying buffer is too small for this replace value");
+					"An underlaying buffer is too small for these replace values");
 		}
 
-		if (spos >= slen) {
+		// We need at least one byte of data to process
+		if (available() < Math.max(maxFromSize, 1) && !eof) {
 			spos = 0;
 			slen = in.read(source);
 		}
 
-		// Note: very simple, not efficient implementation, sorry.
+		// Note: very simple, not efficient implementation; sorry.
 		int count = 0;
-		while (spos < slen && count < buffer.length - to.length) {
-			if (from.length > 0 && startsWith(from, source, spos, slen)) {
-				System.arraycopy(to, 0, buffer, spos, to.length);
-				count += to.length;
-				spos += from.length;
-			} else {
-				buffer[count++] = source[spos++];
+		while (spos < slen && count < len - maxToSize) {
+			boolean replaced = false;
+			for (int i = 0; i < froms.length; i++) {
+				if (froms[i] != null && froms[i].length > 0
+						&& StreamUtils.startsWith(froms[i], source, spos, slen)) {
+					if (tos[i] != null && tos[i].length > 0) {
+						System.arraycopy(tos[i], 0, buffer, off + count,
+								tos[i].length);
+						count += tos[i].length;
+					}
+					
+					spos += froms[i].length;
+					replaced = true;
+					break;
+				}
+			}
+
+			if (!replaced) {
+				buffer[off + count++] = source[spos++];
 			}
 		}
 
 		return count;
 	}
-
-	/**
-	 * Return the bytes array representation of the given {@link String} in
-	 * UTF-8.
-	 * 
-	 * @param str
-	 *            the string to transform into bytes
-	 * @return the content in bytes
-	 */
-	static private byte[] bytes(String str) {
-		try {
-			return str.getBytes("UTF-8");
-		} catch (UnsupportedEncodingException e) {
-			// All conforming JVM must support UTF-8
-			e.printStackTrace();
-			return null;
-		}
-	}
 }