diff --git a/examples/src/test/java/org/apache/wink/client/MockHttpServer.java b/examples/src/test/java/org/apache/wink/client/MockHttpServer.java
index 305a9f87cc8..cbf153db5cb 100644
--- a/examples/src/test/java/org/apache/wink/client/MockHttpServer.java
+++ b/examples/src/test/java/org/apache/wink/client/MockHttpServer.java
@@ -41,8 +41,6 @@
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.Response.Status;
 
-import org.apache.pdfbox.io.IOUtils;
-
 /**
  * Copied from
  * http://svn.apache.org/repos/asf/wink/trunk/wink-component-test-support/src/main/java/org/apache/wink/client/MockHttpServer.java
@@ -335,8 +333,7 @@ private void processRegularContent(InputStream is) throws IOException {
                 return;
             }
             int contentLen = Integer.parseInt(contentLength);
-            byte[] bytes = new byte[contentLen];
-            IOUtils.populateBuffer(is, bytes);
+            byte[] bytes = is.readNBytes(contentLen);
             requestContent.write(bytes);
         }
 
diff --git a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/SecurityHandler.java b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/SecurityHandler.java
index 9d4a02068cf..2a99e65f02e 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/SecurityHandler.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/SecurityHandler.java
@@ -406,7 +406,7 @@ private boolean prepareAESInitializationVector(boolean decrypt, byte[] iv, Input
         if (decrypt)
         {
             // read IV from stream
-            int ivSize = (int) IOUtils.populateBuffer(data, iv);
+            int ivSize = data.readNBytes(iv, 0, iv.length);
             if (ivSize == 0)
             {
                 return false;
@@ -515,10 +515,11 @@ public void decryptStream(COSStream stream, long objNum, long genNum) throws IOE
             // PDFBOX-3229 check case where metadata is not encrypted despite /EncryptMetadata missing
             try (InputStream is = stream.createRawInputStream())
             {
-                buf = new byte[10];
-                long isResult = IOUtils.populateBuffer(is, buf);
+                int nBytes = 10;
+                buf = is.readNBytes(nBytes);
+                int isResult = buf.length;
 
-                if (Long.compare(isResult, buf.length) != 0)
+                if (buf.length != nBytes)
                 {
                     LOG.debug("Tried reading " + buf.length + " bytes but only " + isResult + " bytes read");
                 }
diff --git a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/SampledImageReader.java b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/SampledImageReader.java
index 9563100f78b..c08e6f65aff 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/SampledImageReader.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/SampledImageReader.java
@@ -35,7 +35,6 @@
 import org.apache.pdfbox.cos.COSArray;
 import org.apache.pdfbox.cos.COSNumber;
 import org.apache.pdfbox.filter.DecodeOptions;
-import org.apache.pdfbox.io.IOUtils;
 import org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace;
 import org.apache.pdfbox.pdmodel.graphics.color.PDDeviceGray;
 import org.apache.pdfbox.pdmodel.graphics.color.PDIndexed;
@@ -98,7 +97,7 @@ public static BufferedImage getStencilImage(PDImage pdImage, Paint paint) throws
             for (int y = 0; y < height; y++)
             {
                 int x = 0;
-                int readLen = (int) IOUtils.populateBuffer(iis, buff);
+                int readLen = iis.readNBytes(buff, 0, buff.length);
                 for (int r = 0; r < rowLen && r < readLen; r++)
                 {
                     int byteValue = buff[r];
@@ -421,7 +420,7 @@ private static BufferedImage from1Bit(PDImage pdImage, Rectangle clipped, final
             final byte[] buff = new byte[stride];
             for (int y = 0; y < starty + scanHeight; y++)
             {
-                int read = (int) IOUtils.populateBuffer(iis, buff);
+                int read = iis.readNBytes(buff, 0, buff.length);
                 if (y >= starty && y % currentSubsampling == 0)
                 {
                     int x = startx;
@@ -498,8 +497,8 @@ private static BufferedImage from8bit(PDImage pdImage, WritableRaster raster, Re
             if (startx == 0 && starty == 0 && scanWidth == width && scanHeight == height && currentSubsampling == 1)
             {
                 // we just need to copy all sample data, then convert to RGB image.
-                long inputResult = IOUtils.populateBuffer(input, bank);
-                if (Long.compare(inputResult, (long) width * height * numComponents) != 0)
+                int inputResult = input.readNBytes(bank, 0, bank.length);
+                if (inputResult != (long) width * height * numComponents)
                 {
                     LOG.debug("Tried reading " + (long) width * height * numComponents + " bytes but only " + inputResult + " bytes read");
                 }
@@ -515,7 +514,7 @@ private static BufferedImage from8bit(PDImage pdImage, WritableRaster raster, Re
             int i = 0;
             for (int y = 0; y < starty + scanHeight; ++y)
             {
-                long inputResult = IOUtils.populateBuffer(input, tempBytes);
+                int inputResult = input.readNBytes(tempBytes, 0, tempBytes.length);
 
                 if (Long.compare(inputResult, tempBytes.length) != 0)
                 {