下面列出了java.io.DataInput#readUnsignedByte ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
@Override
public void readData(DataInput din) throws IOException {
m_Reference = din.readShort();
// read lengths
int wc = din.readUnsignedShort();
int bc = din.readUnsignedByte();
// read values
if (m_NonWordDataHandler == null) {
m_Registers = new Register[wc];
ProcessImageFactory pimf = ModbusCoupler.getReference().getProcessImageFactory();
for (int i = 0; i < wc; i++) {
m_Registers[i] = pimf.createRegister(din.readByte(), din.readByte());
}
} else {
m_NonWordDataHandler.readData(din, m_Reference, wc);
}
}
/**
* Decodes a built DateTimeZone from the given stream, as encoded by
* writeTo.
*
* @param in input stream to read encoded DateTimeZone from.
* @param id time zone id to assign
*/
public static DateTimeZone readFrom(DataInput in, String id) throws IOException {
switch (in.readUnsignedByte()) {
case 'F':
DateTimeZone fixed = new FixedDateTimeZone
(id, in.readUTF(), (int)readMillis(in), (int)readMillis(in));
if (fixed.equals(DateTimeZone.UTC)) {
fixed = DateTimeZone.UTC;
}
return fixed;
case 'C':
return CachedDateTimeZone.forZone(PrecalculatedZone.readFrom(in, id));
case 'P':
return PrecalculatedZone.readFrom(in, id);
default:
throw new IOException("Invalid encoding");
}
}
static long readDiskRegionID(DataInput dis) throws IOException {
int bytesToRead = dis.readUnsignedByte();
if (bytesToRead <= DiskStoreImpl.MAX_RESERVED_DRID
&& bytesToRead >= DiskStoreImpl.MIN_RESERVED_DRID) {
long result = dis.readByte(); // we want to sign extend this first byte
bytesToRead--;
while (bytesToRead > 0) {
result <<= 8;
result |= dis.readUnsignedByte(); // no sign extension
bytesToRead--;
}
return result;
} else {
return bytesToRead;
}
}
/**
* Decodes a built DateTimeZone from the given stream, as encoded by
* writeTo.
*
* @param in input stream to read encoded DateTimeZone from.
* @param id time zone id to assign
*/
public static DateTimeZone readFrom(DataInput in, String id) throws IOException {
switch (in.readUnsignedByte()) {
case 'F':
DateTimeZone fixed = new FixedDateTimeZone
(id, in.readUTF(), (int)readMillis(in), (int)readMillis(in));
if (fixed.equals(DateTimeZone.UTC)) {
fixed = DateTimeZone.UTC;
}
return fixed;
case 'C':
return CachedDateTimeZone.forZone(PrecalculatedZone.readFrom(in, id));
case 'P':
return PrecalculatedZone.readFrom(in, id);
default:
throw new IOException("Invalid encoding");
}
}
/**
* Reads encoding generated by writeMillis.
*/
static long readMillis(DataInput in) throws IOException {
int v = in.readUnsignedByte();
switch (v >> 6) {
case 0: default:
// Form 00 (6 bits effective precision)
v = (v << (32 - 6)) >> (32 - 6);
return v * (30 * 60000L);
case 1:
// Form 01 (30 bits effective precision)
v = (v << (32 - 6)) >> (32 - 30);
v |= (in.readUnsignedByte()) << 16;
v |= (in.readUnsignedByte()) << 8;
v |= (in.readUnsignedByte());
return v * 60000L;
case 2:
// Form 10 (38 bits effective precision)
long w = (((long)v) << (64 - 6)) >> (64 - 38);
w |= (in.readUnsignedByte()) << 24;
w |= (in.readUnsignedByte()) << 16;
w |= (in.readUnsignedByte()) << 8;
w |= (in.readUnsignedByte());
return w * 1000L;
case 3:
// Form 11 (64 bits effective precision)
return in.readLong();
}
}
static PrecalculatedZone readFrom(DataInput in, String id) throws IOException {
// Read string pool.
int poolSize = in.readUnsignedShort();
String[] pool = new String[poolSize];
for (int i=0; i<poolSize; i++) {
pool[i] = in.readUTF();
}
int size = in.readInt();
long[] transitions = new long[size];
int[] wallOffsets = new int[size];
int[] standardOffsets = new int[size];
String[] nameKeys = new String[size];
for (int i=0; i<size; i++) {
transitions[i] = readMillis(in);
wallOffsets[i] = (int)readMillis(in);
standardOffsets[i] = (int)readMillis(in);
try {
int index;
if (poolSize < 256) {
index = in.readUnsignedByte();
} else {
index = in.readUnsignedShort();
}
nameKeys[i] = pool[index];
} catch (ArrayIndexOutOfBoundsException e) {
throw new IOException("Invalid encoding");
}
}
DSTZone tailZone = null;
if (in.readBoolean()) {
tailZone = DSTZone.readFrom(in, id);
}
return new PrecalculatedZone
(id, transitions, wallOffsets, standardOffsets, nameKeys, tailZone);
}
/**
* Reads encoding generated by writeMillis.
*/
static long readMillis(DataInput in) throws IOException {
int v = in.readUnsignedByte();
switch (v >> 6) {
case 0: default:
// Form 00 (6 bits effective precision)
v = (v << (32 - 6)) >> (32 - 6);
return v * (30 * 60000L);
case 1:
// Form 01 (30 bits effective precision)
v = (v << (32 - 6)) >> (32 - 30);
v |= (in.readUnsignedByte()) << 16;
v |= (in.readUnsignedByte()) << 8;
v |= (in.readUnsignedByte());
return v * 60000L;
case 2:
// Form 10 (38 bits effective precision)
long w = (((long)v) << (64 - 6)) >> (64 - 38);
w |= (in.readUnsignedByte()) << 24;
w |= (in.readUnsignedByte()) << 16;
w |= (in.readUnsignedByte()) << 8;
w |= (in.readUnsignedByte());
return w * 1000L;
case 3:
// Form 11 (64 bits effective precision)
return in.readLong();
}
}
/**
* Reads encoding generated by writeMillis.
*/
static long readMillis(DataInput in) throws IOException {
int v = in.readUnsignedByte();
switch (v >> 6) {
case 0: default:
// Form 00 (6 bits effective precision)
v = (v << (32 - 6)) >> (32 - 6);
return v * (30 * 60000L);
case 1:
// Form 01 (30 bits effective precision)
v = (v << (32 - 6)) >> (32 - 30);
v |= (in.readUnsignedByte()) << 16;
v |= (in.readUnsignedByte()) << 8;
v |= (in.readUnsignedByte());
return v * 60000L;
case 2:
// Form 10 (38 bits effective precision)
long w = (((long)v) << (64 - 6)) >> (64 - 38);
w |= (in.readUnsignedByte()) << 24;
w |= (in.readUnsignedByte()) << 16;
w |= (in.readUnsignedByte()) << 8;
w |= (in.readUnsignedByte());
return w * 1000L;
case 3:
// Form 11 (64 bits effective precision)
return in.readLong();
}
}
static OfYear readFrom(DataInput in) throws IOException {
return new OfYear((char)in.readUnsignedByte(),
(int)in.readUnsignedByte(),
(int)in.readByte(),
(int)in.readUnsignedByte(),
in.readBoolean(),
(int)readMillis(in));
}
static PrecalculatedZone readFrom(DataInput in, String id) throws IOException {
// Read string pool.
int poolSize = in.readUnsignedShort();
String[] pool = new String[poolSize];
for (int i=0; i<poolSize; i++) {
pool[i] = in.readUTF();
}
int size = in.readInt();
long[] transitions = new long[size];
int[] wallOffsets = new int[size];
int[] standardOffsets = new int[size];
String[] nameKeys = new String[size];
for (int i=0; i<size; i++) {
transitions[i] = readMillis(in);
wallOffsets[i] = (int)readMillis(in);
standardOffsets[i] = (int)readMillis(in);
try {
int index;
if (poolSize < 256) {
index = in.readUnsignedByte();
} else {
index = in.readUnsignedShort();
}
nameKeys[i] = pool[index];
} catch (ArrayIndexOutOfBoundsException e) {
throw new IOException("Invalid encoding");
}
}
DSTZone tailZone = null;
if (in.readBoolean()) {
tailZone = DSTZone.readFrom(in, id);
}
return new PrecalculatedZone
(id, transitions, wallOffsets, standardOffsets, nameKeys, tailZone);
}
static PrecalculatedZone readFrom(DataInput in, String id) throws IOException {
// Read string pool.
int poolSize = in.readUnsignedShort();
String[] pool = new String[poolSize];
for (int i=0; i<poolSize; i++) {
pool[i] = in.readUTF();
}
int size = in.readInt();
long[] transitions = new long[size];
int[] wallOffsets = new int[size];
int[] standardOffsets = new int[size];
String[] nameKeys = new String[size];
for (int i=0; i<size; i++) {
transitions[i] = readMillis(in);
wallOffsets[i] = (int)readMillis(in);
standardOffsets[i] = (int)readMillis(in);
try {
int index;
if (poolSize < 256) {
index = in.readUnsignedByte();
} else {
index = in.readUnsignedShort();
}
nameKeys[i] = pool[index];
} catch (ArrayIndexOutOfBoundsException e) {
throw new IOException("Invalid encoding");
}
}
DSTZone tailZone = null;
if (in.readBoolean()) {
tailZone = DSTZone.readFrom(in, id);
}
return new PrecalculatedZone
(id, transitions, wallOffsets, standardOffsets, nameKeys, tailZone);
}
static OfYear readFrom(DataInput in) throws IOException {
return new OfYear((char)in.readUnsignedByte(),
(int)in.readUnsignedByte(),
(int)in.readByte(),
(int)in.readUnsignedByte(),
in.readBoolean(),
(int)readMillis(in));
}
static PrecalculatedZone readFrom(DataInput in, String id) throws IOException {
// Read string pool.
int poolSize = in.readUnsignedShort();
String[] pool = new String[poolSize];
for (int i=0; i<poolSize; i++) {
pool[i] = in.readUTF();
}
int size = in.readInt();
long[] transitions = new long[size];
int[] wallOffsets = new int[size];
int[] standardOffsets = new int[size];
String[] nameKeys = new String[size];
for (int i=0; i<size; i++) {
transitions[i] = readMillis(in);
wallOffsets[i] = (int)readMillis(in);
standardOffsets[i] = (int)readMillis(in);
try {
int index;
if (poolSize < 256) {
index = in.readUnsignedByte();
} else {
index = in.readUnsignedShort();
}
nameKeys[i] = pool[index];
} catch (ArrayIndexOutOfBoundsException e) {
throw new IOException("Invalid encoding");
}
}
DSTZone tailZone = null;
if (in.readBoolean()) {
tailZone = DSTZone.readFrom(in, id);
}
return new PrecalculatedZone
(id, transitions, wallOffsets, standardOffsets, nameKeys, tailZone);
}
MethodParameters(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool) throws IOException {
super(Const.ATTR_METHOD_PARAMETERS, name_index, length, constant_pool);
final int parameters_count = input.readUnsignedByte();
parameters = new MethodParameter[parameters_count];
for (int i = 0; i < parameters_count; i++) {
parameters[i] = new MethodParameter(input);
}
}
/**
* Reads encoding generated by writeMillis.
*/
static long readMillis(DataInput in) throws IOException {
int v = in.readUnsignedByte();
switch (v >> 6) {
case 0: default:
// Form 00 (6 bits effective precision)
v = (v << (32 - 6)) >> (32 - 6);
return v * (30 * 60000L);
case 1:
// Form 01 (30 bits effective precision)
v = (v << (32 - 6)) >> (32 - 30);
v |= (in.readUnsignedByte()) << 16;
v |= (in.readUnsignedByte()) << 8;
v |= (in.readUnsignedByte());
return v * 60000L;
case 2:
// Form 10 (38 bits effective precision)
long w = (((long)v) << (64 - 6)) >> (64 - 38);
w |= (in.readUnsignedByte()) << 24;
w |= (in.readUnsignedByte()) << 16;
w |= (in.readUnsignedByte()) << 8;
w |= (in.readUnsignedByte());
return w * 1000L;
case 3:
// Form 11 (64 bits effective precision)
return in.readLong();
}
}
/**
* Reads encoding generated by writeMillis.
*/
static long readMillis(DataInput in) throws IOException {
int v = in.readUnsignedByte();
switch (v >> 6) {
case 0: default:
// Form 00 (6 bits effective precision)
v = (v << (32 - 6)) >> (32 - 6);
return v * (30 * 60000L);
case 1:
// Form 01 (30 bits effective precision)
v = (v << (32 - 6)) >> (32 - 30);
v |= (in.readUnsignedByte()) << 16;
v |= (in.readUnsignedByte()) << 8;
v |= (in.readUnsignedByte());
return v * 60000L;
case 2:
// Form 10 (38 bits effective precision)
long w = (((long)v) << (64 - 6)) >> (64 - 38);
w |= (in.readUnsignedByte()) << 24;
w |= (in.readUnsignedByte()) << 16;
w |= (in.readUnsignedByte()) << 8;
w |= (in.readUnsignedByte());
return w * 1000L;
case 3:
// Form 11 (64 bits effective precision)
return in.readLong();
}
}
static PrecalculatedZone readFrom(DataInput in, String id) throws IOException {
// Read string pool.
int poolSize = in.readUnsignedShort();
String[] pool = new String[poolSize];
for (int i=0; i<poolSize; i++) {
pool[i] = in.readUTF();
}
int size = in.readInt();
long[] transitions = new long[size];
int[] wallOffsets = new int[size];
int[] standardOffsets = new int[size];
String[] nameKeys = new String[size];
for (int i=0; i<size; i++) {
transitions[i] = readMillis(in);
wallOffsets[i] = (int)readMillis(in);
standardOffsets[i] = (int)readMillis(in);
try {
int index;
if (poolSize < 256) {
index = in.readUnsignedByte();
} else {
index = in.readUnsignedShort();
}
nameKeys[i] = pool[index];
} catch (ArrayIndexOutOfBoundsException e) {
throw new IOException("Invalid encoding");
}
}
DSTZone tailZone = null;
if (in.readBoolean()) {
tailZone = DSTZone.readFrom(in, id);
}
return new PrecalculatedZone
(id, transitions, wallOffsets, standardOffsets, nameKeys, tailZone);
}
/**
* Reads encoding generated by writeMillis.
*/
static long readMillis(DataInput in) throws IOException {
int v = in.readUnsignedByte();
switch (v >> 6) {
case 0: default:
// Form 00 (6 bits effective precision)
v = (v << (32 - 6)) >> (32 - 6);
return v * (30 * 60000L);
case 1:
// Form 01 (30 bits effective precision)
v = (v << (32 - 6)) >> (32 - 30);
v |= (in.readUnsignedByte()) << 16;
v |= (in.readUnsignedByte()) << 8;
v |= (in.readUnsignedByte());
return v * 60000L;
case 2:
// Form 10 (38 bits effective precision)
long w = (((long)v) << (64 - 6)) >> (64 - 38);
w |= (in.readUnsignedByte()) << 24;
w |= (in.readUnsignedByte()) << 16;
w |= (in.readUnsignedByte()) << 8;
w |= (in.readUnsignedByte());
return w * 1000L;
case 3:
// Form 11 (64 bits effective precision)
return in.readLong();
}
}
private void read(DataInput din) throws java.io.IOException {
u1TargetType = din.readUnsignedByte();
switch (u1TargetType) {
//
// https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.20-400
//
case 0x00:
// type parameter declaration of generic class or interface => type_parameter_target
case 0x01:
// type parameter declaration of generic method or constructor => type_parameter_target
u1TypeParameterIndex = din.readUnsignedByte();
break;
case 0x10:
// type in extends or implements clause of class declaration (including the direct superclass
// or direct superinterface of an anonymous class declaration), or in extends clause of interface declaration
// => supertype_target
u2SupertypeIndex = din.readUnsignedShort();
break;
case 0x11:
// type in bound of type parameter declaration of generic class or interface
// => type_parameter_bound_target
case 0x12:
// type in bound of type parameter declaration of generic method or constructor
// => type_parameter_bound_target
u1TypeParameterIndex = din.readUnsignedByte();
u1TypeBoundIndex = din.readUnsignedByte();
break;
case 0x13:
// type in field declaration => empty_target
case 0x14:
// return type of method, or type of newly constructed object => empty_target
case 0x15:
// receiver type of method or constructor => empty_target
break;
case 0x16:
// type in formal parameter declaration of method, constructor, or lambda expression => formal_parameter_target
u1FormalParameterIndex = din.readUnsignedByte();
break;
case 0x17:
// type in throws clause of method or constructor => throws_target
u2ThrowsTypeIndex = din.readUnsignedShort();
break;
//
// https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.20-410
//
case 0x40:
// type in local variable declaration => localvar_target
case 0x41:
// type in resource variable declaration => localvar_target
localvarTarget = new LocalvarTarget();
localvarTarget.readInfo(din);
break;
case 0x42:
// type in exception parameter declaration
u2ExceptionTableIndex = din.readUnsignedShort();
break;
case 0x43:
// type in instanceof expression => offset_target
case 0x44:
// type in new expression => offset_target
case 0x45:
// type in method reference expression using ::new => offset_target
case 0x46:
// type in method reference expression using ::Identifier => offset_target
u2Offset = din.readUnsignedShort();
break;
case 0x47:
// type in cast expression => type_argument_target
case 0x48:
// type argument for generic constructor in new expression or explicit constructor invocation statement => type_argument_target
case 0x49:
// type argument for generic method in method invocation expression => type_argument_target
case 0x4A:
// type argument for generic constructor in method reference expression using ::new => type_argument_target
case 0x4B:
// type argument for generic method in method reference expression using ::Identifier => type_argument_target
u2Offset = din.readUnsignedShort();
u1TypeArgumentIndex = din.readUnsignedByte();
break;
default:
throw new IllegalArgumentException("Unkown annotation target type: 0x"+Integer.toHexString(u1TargetType)+"");
}
targetPath = new TypePath();
targetPath.readInfo(din);
u2TypeIndex = din.readUnsignedShort();
u2NumElementValuePairs = din.readUnsignedShort();
elementValuePairs = new ElementValuePairInfo[u2NumElementValuePairs];
for (int i = 0; i < u2NumElementValuePairs; i++) {
elementValuePairs[i] = ElementValuePairInfo.create(din);
}
}
/**
* Decoding the variable-length integer. Suppose the value of the first byte
* is FB, and the following bytes are NB[*].
* <ul>
* <li>if (FB >= -32), return (long)FB;
* <li>if (FB in [-72, -33]), return (FB+52)<<8 + NB[0]&0xff;
* <li>if (FB in [-104, -73]), return (FB+88)<<16 + (NB[0]&0xff)<<8 +
* NB[1]&0xff;
* <li>if (FB in [-120, -105]), return (FB+112)<<24 + (NB[0]&0xff)<<16 +
* (NB[1]&0xff)<<8 + NB[2]&0xff;
* <li>if (FB in [-128, -121]), return interpret NB[FB+129] as a signed
* big-endian integer.
* </ul>
*
* @param in input stream
* @return the decoded long integer.
* @throws java.io.IOException if unable to read from in
*/
public static long readVLong(final DataInput in) throws IOException {
final int firstByte = in.readByte();
if (firstByte >= -32) {
return firstByte;
}
switch ((firstByte + 128) / 8) {
case 11:
case 10:
case 9:
case 8:
case 7:
return ((firstByte + 52) << 8) | in.readUnsignedByte();
case 6:
case 5:
case 4:
case 3:
return ((firstByte + 88) << 16) | in.readUnsignedShort();
case 2:
case 1:
return ((firstByte + 112) << 24) | (in.readUnsignedShort() << 8)
| in.readUnsignedByte();
case 0:
final int len = firstByte + 129;
switch (len) {
case 4:
return in.readInt();
case 5:
return (((long) in.readInt()) << 8) | in.readUnsignedByte();
case 6:
return (((long) in.readInt()) << 16) | in.readUnsignedShort();
case 7:
return (((long) in.readInt()) << 24) | (in.readUnsignedShort() << 8)
| in.readUnsignedByte();
case 8:
return in.readLong();
default:
throw new IOException("Corrupted VLong encoding");
}
default:
throw new RuntimeException("Internal error");
}
}