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// We use big-endian as DataOutputStream does
// (TODO: decide on an endianness!)
sclass ByteHead /*is DataOutput*/ {
settable bool readMode;
settable bool writeMode;
settable InputStream inputStream;
settable OutputStream outputStream;
*() {}
*(InputStream *inputStream) { readMode(true); }
*(OutputStream *outputStream) { writeMode(true); }
void write(byte[] data) ctex {
ensureWriteMode();
outputStream?.write(data);
}
void writeLong(long l) {
writeInt((int) (l >> 32));
writeInt((int) l);
}
void writeInt(int i) {
write(i >> 24);
write(i >> 16);
write(i >> 8);
write(i);
}
void writeShort(int i) {
write(i >> 8);
write(i);
}
void writeByte aka write(int i) ctex {
ensureWriteMode();
outputStream?.write(i);
}
void writeASCII(char c) {
write(toASCII(c));
}
void writeASCII(S s) {
write(toASCII(s));
}
long readLong() {
long i = readInt() << 32;
ret i | (readInt() & 0xFFFFFFFFL);
}
int readInt() {
int i = read() << 24;
i |= read() << 16;
i |= read() << 8;
ret (short) (i | read());
}
short readShort() {
int i = read() << 8;
ret (short) (i | read());
}
// -1 for EOF
int readByte aka read() ctex {
ensureReadMode();
ret inputStream.read();
}
void ensureReadMode {
if (!readMode) fail("Not in read mode");
}
void ensureWriteMode {
if (!writeMode) fail("Not in write mode");
}
// exchange = read or write depending on mode
void exchangeShort(IF0 getter, IVF1 setter) {
if (writeMode())
writeShort(getter!);
if (readMode())
setter.get(readShort());
}
void exchangeLong(IVar var) {
exchangeLong(var.getter(), var.setter());
}
void exchangeLong(IF0 getter, IVF1 setter) {
if (writeMode())
writeLong(getter!);
if (readMode())
setter.get(readLong());
}
void exchangeInt(int i) {
exchangeInt(-> i, j -> assertEquals(i, j));
}
void exchangeInt(IF0 getter, IVF1 setter) {
if (writeMode())
writeInt(getter!);
if (readMode())
setter.get(readInt());
}
void exchange(ByteIO writable) {
if (writable != null) writable.readWrite(this);
}
void exchangeAll(Iterable writables) {
if (writables != null)
for (writable : writables)
exchange(writable);
}
// write size in bytes of element first (as int),
// then the element itself.
// upon reading, size is actually ignored.
void exchangeWithSize(ByteIO writable) {
if (writeMode()) {
byte[] data = writable.saveToByteArray();
writeInt(l(data));
write(data);
}
if (readMode()) {
int n = readInt();
writable.readWrite(this);
}
}
void finish {}
}