/** Returns the cache entry with the specified key if it exists, null otherwise. */
@Override
public synchronized Entry get(String key) {
CacheHeader entry = mEntries.get(key); // 获取摘要
// if the entry does not exist, return.
if (entry == null) {
return null;
}
File file = getFileForKey(key); // 获取文件
CountingInputStream cis = null;
try {
cis = new CountingInputStream(new FileInputStream(file));
CacheHeader.readHeader(cis); // eat header文件的具体内容在摘要之后，所有先读取摘要，将当前读取位置移动到摘要之后
byte[] data = streamToBytes(cis, (int) (file.length() - cis.bytesRead)); // 当前位置移动到摘要之后，读取缓存内容
return entry.toCacheEntry(data); // 根据读取的缓存内容，结合缓存摘要，生成Cache.Entry对象
} catch (IOException e) {
VolleyLog.d("%s: %s", file.getAbsolutePath(), e.toString());
remove(key); // 发生异常则删除异常缓存
return null;
} finally {
if (cis != null) {
try {
cis.close();
} catch (IOException ioe) {
return null;
}
}
}
}
/** Returns the cache entry with the specified key if it exists, null otherwise. */
@Override
public synchronized Entry get(String key) {
CacheHeader entry = mEntries.get(key);
// if the entry does not exist, return.
if (entry == null) {
return null;
}
File file = getFileForKey(key);
CountingInputStream cis = null;
try {
cis = new CountingInputStream(new BufferedInputStream(new FileInputStream(file)));
CacheHeader.readHeader(cis); // eat header
byte[] data = streamToBytes(cis, (int) (file.length() - cis.bytesRead));
return entry.toCacheEntry(data);
} catch (IOException e) {
VolleyLog.d("%s: %s", file.getAbsolutePath(), e.toString());
remove(key);
return null;
} finally {
if (cis != null) {
try {
cis.close();
} catch (IOException ioe) {
return null;
}
}
}
}
/** Test that constructor offsets work */
@Test
public void testConstructor() throws Exception {
CountingInputStream cis;
cis = new CountingInputStream(NULL_INPUTSTREAM, 5l);
assertEquals(5l, cis.getPos());
cis.close();
cis = new CountingInputStream(NULL_INPUTSTREAM, 500000000000l);
assertEquals(500000000000l, cis.getPos());
cis.close();
}
public static void compareMapFiles(MapLoader expectedSavegame, MapLoader actualSavegame)
throws IOException, MapLoadException, ClassNotFoundException {
System.out.println(
"Comparing expected '"
+ expectedSavegame
+ "' with actual '"
+ actualSavegame
+ "' (uncompressed!)");
try (InputStream expectedStream =
RemakeMapLoader.getMapInputStream(expectedSavegame.getListedMap());
CountingInputStream actualStream =
new CountingInputStream(
RemakeMapLoader.getMapInputStream(actualSavegame.getListedMap()))) {
MapFileHeader expectedHeader = MapFileHeader.readFromStream(expectedStream);
MatchConstants.init(new NetworkTimer(true), 0L);
MatchConstants.deserialize(new ObjectInputStream(expectedStream));
int expectedTime = MatchConstants.clock().getTime();
ExtendedRandom expectedRandom = MatchConstants.random();
MatchConstants.clearState();
MapFileHeader actualHeader = MapFileHeader.readFromStream(actualStream);
MatchConstants.init(new NetworkTimer(true), 1L);
MatchConstants.deserialize(new ObjectInputStream(actualStream));
int actualTime = MatchConstants.clock().getTime();
ExtendedRandom actualRandom = MatchConstants.random();
MatchConstants.clearState();
assertEquals(expectedHeader.getBaseMapId(), actualHeader.getBaseMapId());
assertEquals(expectedTime, actualTime);
// Test the random behavior a bit to have a high probability of equality. An equals method
// does not exist for Random.
assertEquals(expectedRandom.nextInt(), actualRandom.nextInt());
assertEquals(expectedRandom.nextInt(), actualRandom.nextInt());
assertEquals(expectedRandom.nextInt(), actualRandom.nextInt());
int e, a;
while (((e = expectedStream.read()) != -1) & ((a = actualStream.read()) != -1)) {
assertEquals("difference at (uncompressed) byte " + actualStream.getByteCounter(), e, a);
}
assertEquals("files have different lengths (uncompressed)", e, a);
}
}
/** Test that single byte reads have the desired effect on counting */
@Test
public void testSingleByteReads() throws Exception {
ByteArrayInputStream bais = new ByteArrayInputStream(TEST_ARRAY);
CountingInputStream cis = new CountingInputStream(bais);
assertEquals((long) 0, cis.getPos());
for (long i = 0; i < TEST_ARRAY.length; i++) {
assertEquals(i, cis.getPos());
int b = cis.read();
assertEquals((byte) b, TEST_ARRAY[(int) i]);
assertEquals(i + 1, cis.getPos());
}
assertEquals(TEST_ARRAY.length, cis.getPos());
assertEquals(-1, cis.read());
assertEquals(TEST_ARRAY.length, cis.getPos());
}
/** Test that two byte reads have the desired effect on counting */
@Test
public void testTwoByteReads() throws Exception {
ByteArrayInputStream bais = new ByteArrayInputStream(TEST_ARRAY);
CountingInputStream cis = new CountingInputStream(bais);
assertEquals((long) 0, cis.getPos());
for (long i = 0; i < TEST_ARRAY.length / 2; i++) {
assertEquals(i * 2, cis.getPos());
final byte[] read = new byte[2];
final int rtr = cis.read(read);
assertEquals(rtr, read.length);
assertEquals(read[0], TEST_ARRAY[(int) i * 2]);
assertEquals(read[1], TEST_ARRAY[(int) (i * 2) + 1]);
assertEquals("offset after read i=" + i + "; ", (i * 2) + read.length, cis.getPos());
}
assertEquals(TEST_ARRAY.length, cis.getPos());
assertEquals(-1, cis.read());
assertEquals(TEST_ARRAY.length, cis.getPos());
}
private void validate() throws IOException {
long compressedSize = inCounted.getSize();
// Validate Compressed Size and Uncompressed Size if they were
// present in Block Header.
if ((compressedSizeInHeader != -1 && compressedSizeInHeader != compressedSize)
|| (uncompressedSizeInHeader != -1 && uncompressedSizeInHeader != uncompressedSize))
throw new CorruptedInputException();
// Block Padding bytes must be zeros.
while ((compressedSize++ & 3) != 0)
if (inData.readUnsignedByte() != 0x00) throw new CorruptedInputException();
// Validate the integrity check.
byte[] storedCheck = new byte[check.getSize()];
inData.readFully(storedCheck);
if (!Arrays.equals(check.finish(), storedCheck))
throw new CorruptedInputException("Integrity check (" + check.getName() + ") does not match");
}
@Override
public int read(byte[] buf, int off, int len) throws IOException {
if (endReached) return -1;
int ret = filterChain.read(buf, off, len);
if (ret > 0) {
check.update(buf, off, ret);
uncompressedSize += ret;
// Catch invalid values.
long compressedSize = inCounted.getSize();
if (compressedSize < 0
|| compressedSize > compressedSizeLimit
|| uncompressedSize < 0
|| (uncompressedSizeInHeader != -1 && uncompressedSize > uncompressedSizeInHeader))
throw new CorruptedInputException();
// Check the Block integrity as soon as possible:
// - The filter chain shouldn't return less than requested
// unless it hit the end of the input.
// - If the uncompressed size is known, we know when there
// shouldn't be more data coming. We still need to read
// one byte to let the filter chain catch errors and to
// let it read end of payload marker(s).
if (ret < len || uncompressedSize == uncompressedSizeInHeader) {
if (filterChain.read() != -1) throw new CorruptedInputException();
validate();
endReached = true;
}
} else if (ret == -1) {
validate();
endReached = true;
}
return ret;
}
public int getProgress() {
return in.getByteCount();
}
public long getUnpaddedSize() {
return headerSize + inCounted.getSize() + check.getSize();
}