use global offset for buffered chunks

index.js

@@ -14,33 +14,22 @@ function BinarySplit (matcher) {
   function write (buf, enc, done) {
     bufcount++
     var offset = 0
-
+    var lastMatch = 0
     if (buffered) {
       buf = bops.join([buffered, buf])
+      offset = buffered.length
       buffered = undefined
     }
 
-    while (buf) {
+    while (true) {
       var idx = firstMatch(buf, offset)
-      if (idx) {
-        var line = bops.subarray(buf, offset, idx)
-        if (idx === buf.length) {
-          buffered = line
-          buf = undefined
-          offset = idx
-        } else {
-          this.push(line)
-          offset = idx + matcher.length
-        }
-      } else if (idx === 0) {
-        buf = bops.subarray(buf, offset + matcher.length)
+      if (idx !== -1 && idx < buf.length) {
+        this.push(bops.subarray(buf, lastMatch, idx))
+        offset = idx + matcher.length
+        lastMatch = offset
       } else {
-        if (offset >= buf.length) {
-          buffered = undefined
-        } else {
-          buffered = buf
-        }
-        buf = undefined
+        buffered = bops.subarray(buf, lastMatch)
+        break
       }
     }
 
@@ -54,7 +43,7 @@ function BinarySplit (matcher) {
   }
 
   function firstMatch (buf, offset) {
-    if (offset >= buf.length) return false
+    if (offset >= buf.length) return -1
     for (var i = offset; i < buf.length; i++) {
       if (buf[i] === matcher[0]) {
         if (matcher.length > 1) {

test.js

@@ -65,3 +65,25 @@ test('matcher at index 0 check', function (t) {
   splitStream.write(new Buffer('\nhello\nmax'))
   splitStream.end()
 })
+
+test('chunked input', function (t) {
+  fs.createReadStream('test.json')
+  .pipe(split('\n'))
+  .pipe(split('i'))
+  .pipe(splitTest(':', function (err, items) {
+    if (err) throw err
+    t.equals(items.length, 4)
+    t.end()
+  }))
+})
+
+test('chunked input with long matcher', function (t) {
+  fs.createReadStream('test.json')
+  .pipe(split('\n'))
+  .pipe(splitTest('hello', function (err, items) {
+    if (err) throw err
+    t.equals(items.length, 2)
+    t.equals(items[0].toString(), '{"')
+    t.end()
+  }))
+})