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package org.sufficientlysecure.keychain.testsupport;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.Iterator;
/**
* Misc support functions. Would just use Guava / Apache Commons but
* avoiding extra dependencies.
*/
public class TestDataUtil {
public static byte[] readFully(InputStream input) {
ByteArrayOutputStream output = new ByteArrayOutputStream();
appendToOutput(input, output);
return output.toByteArray();
}
private static void appendToOutput(InputStream input, ByteArrayOutputStream output) {
byte[] buffer = new byte[8192];
int bytesRead;
try {
while ((bytesRead = input.read(buffer)) != -1) {
output.write(buffer, 0, bytesRead);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static byte[] readAllFully(Collection<String> inputResources) {
ByteArrayOutputStream output = new ByteArrayOutputStream();
for (String inputResource : inputResources) {
appendToOutput(getResourceAsStream(inputResource), output);
}
return output.toByteArray();
}
public static InputStream getResourceAsStream(String resourceName) {
return TestDataUtil.class.getResourceAsStream(resourceName);
}
/**
* Null-safe equivalent of {@code a.equals(b)}.
*/
public static boolean equals(Object a, Object b) {
return (a == null) ? (b == null) : a.equals(b);
}
public static <T> boolean iterEquals(Iterator<T> a, Iterator<T> b, EqualityChecker<T> comparator) {
while (a.hasNext()) {
T aObject = a.next();
if (!b.hasNext()) {
return false;
}
T bObject = b.next();
if (!comparator.areEquals(aObject, bObject)) {
return false;
}
}
if (b.hasNext()) {
return false;
}
return true;
}
public static <T> boolean iterEquals(Iterator<T> a, Iterator<T> b) {
return iterEquals(a, b, new EqualityChecker<T>() {
@Override
public boolean areEquals(T lhs, T rhs) {
return TestDataUtil.equals(lhs, rhs);
}
});
}
public static interface EqualityChecker<T> {
public boolean areEquals(T lhs, T rhs);
}
public static byte[] concatAll(byte[]... byteArrays) {
if (byteArrays.length == 1) {
return byteArrays[0];
} else if (byteArrays.length == 2) {
return concat(byteArrays[0], byteArrays[1]);
} else {
byte[] first = concat(byteArrays[0], byteArrays[1]);
byte[][] remainingArrays = new byte[byteArrays.length - 1][];
remainingArrays[0] = first;
System.arraycopy(byteArrays, 2, remainingArrays, 1, byteArrays.length - 2);
return concatAll(remainingArrays);
}
}
private static byte[] concat(byte[] a, byte[] b) {
int aLen = a.length;
int bLen = b.length;
byte[] c = new byte[aLen + bLen];
System.arraycopy(a, 0, c, 0, aLen);
System.arraycopy(b, 0, c, aLen, bLen);
return c;
}
}
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