new: ReplaceOutputStream

[nikiroo-utils.git] / src / be / nikiroo / utils / streams / StreamUtils.java

diff --git a/src/be/nikiroo/utils/streams/StreamUtils.java b/src/be/nikiroo/utils/streams/StreamUtils.java
new file mode 100644 (file)
index 0000000..6b8251a
--- /dev/null
+++ b/src/be/nikiroo/utils/streams/StreamUtils.java
@@ -0,0 +1,70 @@
+package be.nikiroo.utils.streams;
+
+import java.io.UnsupportedEncodingException;
+
+/**
+ * Some non-public utilities used in the stream classes.
+ * 
+ * @author niki
+ */
+class StreamUtils {
+       /**
+        * Check if the buffer starts with the given search term (given as an array,
+        * a start position and an end position).
+        * <p>
+        * Note: the parameter <tt>stop</tt> is the <b>index</b> of the last
+        * position, <b>not</b> the length.
+        * <p>
+        * Note: the search term size <b>must</b> be smaller or equal the internal
+        * buffer size.
+        * 
+        * @param search
+        *            the term to search for
+        * @param buffer
+        *            the buffer to look into
+        * @param start
+        *            the offset at which to start the search
+        * @param stop
+        *            the maximum index of the data to check (this is <b>not</b> a
+        *            length, but an index)
+        * 
+        * @return TRUE if the search content is present at the given location and
+        *         does not exceed the <tt>len</tt> index
+        */
+       static public boolean startsWith(byte[] search, byte[] buffer, int start,
+                       int stop) {
+
+               // Check if there even is enough space for it
+               if (search.length > (stop - start)) {
+                       return false;
+               }
+
+               boolean same = true;
+               for (int i = 0; i < search.length; i++) {
+                       if (search[i] != buffer[start + i]) {
+                               same = false;
+                               break;
+                       }
+               }
+
+               return same;
+       }
+
+       /**
+        * 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 public byte[] bytes(String str) {
+               try {
+                       return str.getBytes("UTF-8");
+               } catch (UnsupportedEncodingException e) {
+                       // All conforming JVM must support UTF-8
+                       e.printStackTrace();
+                       return null;
+               }
+       }
+}