/**
* Convenience method for reading a binary file and base64-encoding it.
*
* @param filename Filename for reading binary data
* @return base64-encoded string or null if unsuccessful
* @since 2.1
*/
public static String encodeFromFile(String filename) {
String encodedData = null;
Base64.InputStream bis = null;
try {
// Set up some useful variables
java.io.File file = new java.io.File(filename);
byte[] buffer = new byte[(int) (file.length() * 1.4)];
int length = 0;
int numBytes = 0;
// Open a stream
bis =
new Base64.InputStream(
new java.io.BufferedInputStream(new java.io.FileInputStream(file)), Base64.ENCODE);
// Read until done
while ((numBytes = bis.read(buffer, length, 4096)) >= 0) length += numBytes;
// Save in a variable to return
encodedData = new String(buffer, 0, length, Base64.PREFERRED_ENCODING);
} // end try
catch (java.io.IOException e) {
System.err.println("Error encoding from file " + filename);
} // end catch: IOException
finally {
try {
bis.close();
} catch (Exception e) {
}
} // end finally
return encodedData;
} // end encodeFromFile
/**
* Convenience method for reading a base64-encoded file and decoding it.
*
* @param filename Filename for reading encoded data
* @return decoded byte array or null if unsuccessful
* @since 2.1
*/
public static byte[] decodeFromFile(String filename) {
byte[] decodedData = null;
Base64.InputStream bis = null;
try {
// Set up some useful variables
java.io.File file = new java.io.File(filename);
byte[] buffer = null;
int length = 0;
int numBytes = 0;
// Check for size of file
if (file.length() > Integer.MAX_VALUE) {
System.err.println(
"File is too big for this convenience method (" + file.length() + " bytes).");
return null;
} // end if: file too big for int index
buffer = new byte[(int) file.length()];
// Open a stream
bis =
new Base64.InputStream(
new java.io.BufferedInputStream(new java.io.FileInputStream(file)), Base64.DECODE);
// Read until done
while ((numBytes = bis.read(buffer, length, 4096)) >= 0) length += numBytes;
// Save in a variable to return
decodedData = new byte[length];
System.arraycopy(buffer, 0, decodedData, 0, length);
} // end try
catch (java.io.IOException e) {
System.err.println("Error decoding from file " + filename);
} // end catch: IOException
finally {
try {
bis.close();
} catch (Exception e) {
}
} // end finally
return decodedData;
} // end decodeFromFile
private void runStreamTest(int length) throws Exception {
byte[] data = createData(length);
ByteArrayOutputStream out_bytes = new ByteArrayOutputStream();
OutputStream out = new Base64.OutputStream(out_bytes);
out.write(data);
out.close();
byte[] encoded = out_bytes.toByteArray();
byte[] decoded = Base64.decode(encoded, 0, encoded.length);
assertTrue(Arrays.equals(data, decoded));
Base64.InputStream in = new Base64.InputStream(new ByteArrayInputStream(encoded));
out_bytes = new ByteArrayOutputStream();
byte[] buffer = new byte[3];
for (int n = in.read(buffer); n > 0; n = in.read(buffer)) {
out_bytes.write(buffer, 0, n);
}
out_bytes.close();
in.close();
decoded = out_bytes.toByteArray();
assertTrue(Arrays.equals(data, decoded));
}
