import java.io.IOException;
import java.io.InputStream;
+import be.nikiroo.utils.StringUtils;
+
/**
* This {@link InputStream} will change some of its content by replacing it with
* something else.
* @author niki
*/
public class ReplaceInputStream extends BufferedInputStream {
+ /**
+ * 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;
* the {@link String} to replace with
*/
public ReplaceInputStream(InputStream in, String from, String to) {
- this(in, StreamUtils.bytes(from), StreamUtils.bytes(to));
+ this(in, StringUtils.getBytes(from), StringUtils.getBytes(to));
}
/**
* the values to replace with
*/
public ReplaceInputStream(InputStream in, String[] froms, String[] tos) {
- this(in, StreamUtils.bytes(froms), StreamUtils.bytes(tos));
+ this(in, StreamUtils.getBytes(froms), StreamUtils.getBytes(tos));
}
/**
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);
}
- source = new byte[4096];
+ // 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;
}
"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 < len - maxToSize) {
boolean replaced = false;