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COSC_3P95_Assignment_2
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bit of code cleanup

main
Brett 2023-11-14 12:37:54 -05:00
parent 4c52ea7ed4
commit d5b3ef5ac2
1 changed files with 37 additions and 28 deletions
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63
src/shared/FileHeader.java
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@ -51,38 +51,36 @@ public class FileHeader {
public void write(DataOutputStream writer) {
try {
DataInputStream reader = new DataInputStream(new BufferedInputStream(Files.newInputStream(Paths.get(full_path))));
DataInputStream fileReader = new DataInputStream(new BufferedInputStream(Files.newInputStream(Paths.get(full_path))));
writer.writeByte(COMMAND.WRITE.type);
writer.writeUTF(relative_path);
StreamingXXHash64 streamHash = XX_HASH_FACTORY.newStreamingHash64(SEED);
while (reader.available() > 0) {
while (fileReader.available() > 0) {
// read / write files in chunks
int read = Integer.min(reader.available(), READER_SIZE);
byte[] bytes = new byte[read];
byte[] readBytes = new byte[Integer.min(fileReader.available(), READER_SIZE)];
int amount = reader.read(bytes);
if (amount <= 0)
int totalRead = fileReader.read(readBytes);
if (totalRead <= 0)
break;
// create a checksum for this chunk + update the overall checksum
streamHash.update(bytes, 0, amount);
long hash = HASH_64.hash(bytes, 0, amount, SEED);
streamHash.update(readBytes, 0, totalRead);
long hash = HASH_64.hash(readBytes, 0, totalRead, SEED);
// apply compression
int maxCompressedLength = COMPRESSOR.maxCompressedLength(bytes.length);
byte[] compressed = new byte[maxCompressedLength];
int compressedLength = COMPRESSOR.compress(bytes, 0, bytes.length, compressed, 0, maxCompressedLength);
int maxCompressedLength = COMPRESSOR.maxCompressedLength(readBytes.length);
byte[] compressedBytes = new byte[maxCompressedLength];
int compressedLength = COMPRESSOR.compress(readBytes, 0, readBytes.length, compressedBytes, 0, maxCompressedLength);
System.out.println("Writing " + compressedLength + " bytes");
writer.writeInt(amount);
writer.writeInt(totalRead);
writer.writeInt(compressedLength);
writer.writeLong(hash);
writer.write(compressed, 0, compressedLength);
writer.write(compressedBytes, 0, compressedLength);
writer.flush();
}
reader.close();
fileReader.close();
writer.writeInt(0);
writer.writeLong(streamHash.getValue());
writer.flush();
@ -93,30 +91,30 @@ public class FileHeader {
public static void receive(DataInputStream reader) {
try {
String userFile = reader.readUTF();
String[] pathParts = userFile.split("/");
String userDirectory = userFile.replace(pathParts[pathParts.length-1], "");
File ld = new File(System.getProperty("user.dir") + "/write/" + userDirectory);
if (!ld.exists())
if(!ld.mkdirs())
System.out.println("Failed to create directory");
String path = System.getProperty("user.dir") + "/write/" + userFile;
String path = createPath(reader.readUTF());
System.out.println("Writing to file: " + path);
DataOutputStream writer = new DataOutputStream(new BufferedOutputStream(Files.newOutputStream(Paths.get(path))));
int uncompressed_size = 0;
StreamingXXHash64 computedStreamHash = XX_HASH_FACTORY.newStreamingHash64(SEED);
while ((uncompressed_size = reader.readInt()) > 0) {
while (true) {
int uncompressed_size = reader.readInt();
if (uncompressed_size <= 0)
break;
int compressed_size = reader.readInt();
long hash = reader.readLong();
byte[] data = new byte[compressed_size];
int amount = reader.read(data, 0, compressed_size);
assert(amount == compressed_size);
byte[] restored = new byte[uncompressed_size];
int len = DECOMPRESSOR.decompress(data, 0, restored, 0, uncompressed_size);
assert(len == uncompressed_size);
long computedHash = HASH_64.hash(restored, 0, uncompressed_size, SEED);
computedStreamHash.update(restored, 0, uncompressed_size);
@ -135,4 +133,15 @@ public class FileHeader {
}
}
private static String createPath(String userFile) {
String[] pathParts = userFile.split("/");
String userDirectory = userFile.replace(pathParts[pathParts.length - 1], "");
File ld = new File(System.getProperty("user.dir") + "/write/" + userDirectory);
if (!ld.exists() && !ld.mkdirs())
System.out.println("Failed to create directory");
return System.getProperty("user.dir") + "/write/" + userFile;
}
}