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pack_unpack.dart
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pack_unpack.dart
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import 'dart:typed_data';
import 'dependencies/buffer_isoos/buffer.dart';
import 'dependencies/buffer_terrier/raw_reader.dart';
import 'dependencies/buffer_terrier/raw_writer.dart';
import 'utils/buffer.dart';
// C# example https://stackoverflow.com/questions/28225303/equivalent-in-c-sharp-of-pythons-struct-pack-unpack/28418846#28418846
// java example https://stackoverflow.com/questions/29879009/how-to-convert-python-struct-unpack-to-java
/// binary data pack and unpack
///
///
/// conversão Python to Dart
/// type Python | type dart
/// deque "Double-ended queue" | Queue
/// https://docs.python.org/3/library/struct.html#format-characters
/// Format | C Type | Python type | Standard size | code
/// h | short | integer | 2 104
/// i | int | integer | 4 105
/// c | char | bytes of length 1 | 1 99
/// b | signed char | integer | 1 98
/// q | long long | integer | 8 113
/// Q | unsigned long long | integer | 8 81
///
/// pega valores não-byte (por exemplo, inteiros, strings, etc.)
/// e os converte em bytes usando o formato especificado
List<int> pack(String fmt, List<int> vals) {
//[105, 104, 99, 98, 113, 81]
//['i', 'h', 'c', 'b', 'q', 'Q']
final formats = fmt.codeUnits;
if (vals.length != formats.length) {
throw Exception(
'pack expected ${formats.length} items for packing (got ${formats.length})');
}
final bytes = <int>[];
for (var i = 0; i < formats.length; i++) {
var f = formats[i];
var val = vals[i];
// c
if (f == 99) {
//assert(val >= 0 && val < 256);
bytes.add(val);
}
// b
else if (f == 98) {
//assert(val >= 0 && val < 256);
bytes.add(val);
}
//Int16 short 2 bytes h
else if (f == 104) {
//assert(val >= -32768 && val <= 32767);
if (val < 0) val = 0x10000 + val;
int a = (val >> 8) & 0x00FF;
int b = val & 0x00FF;
//checar ordem
bytes.add(a);
bytes.add(b);
} //Int32 int 4 bytes i
else if (f == 105) {
//assert(val >= -2147483648 && val <= 2147483647);
if (val < 0) val = 0x100000000 + val;
int a = (val >> 24) & 0x000000FF;
int b = (val >> 16) & 0x000000FF;
int c = (val >> 8) & 0x000000FF;
int d = val & 0x000000FF;
//checar ordem
bytes.add(a);
bytes.add(b);
bytes.add(c);
bytes.add(d);
} else {
throw Exception('format unknow');
}
}
return bytes;
}
/// using isoos ByteDataWriter
List<int> pack2(String fmt, List<int> vals) {
//[105, 104, 99, 98, 113, 81]
//['i', 'h', 'c', 'b', 'q', 'Q']
final formats = fmt.codeUnits;
if (vals.length != formats.length) {
throw Exception(
'pack expected ${formats.length} items for packing (got ${formats.length})');
}
var buffer = ByteDataWriter();
for (var i = 0; i < formats.length; i++) {
var f = formats[i];
var val = vals[i];
// c
if (f == 99) {
//assert(val >= 0 && val < 256);
buffer.writeInt8(val);
}
// b
else if (f == 98) {
//assert(val >= 0 && val < 256);
buffer.writeInt8(val);
}
//Int16 short 2 bytes h
else if (f == 104) {
buffer.writeInt16(val);
} //Int32 int 4 bytes i
else if (f == 105) {
buffer.writeInt32(val);
} else {
throw Exception('format unknow');
}
}
return buffer.toBytes();
}
/// using terrier RawWriter
List<int> pack3(String fmt, List<int> vals) {
//[105, 104, 99, 98, 113, 81]
//['i', 'h', 'c', 'b', 'q', 'Q']
final formats = fmt.codeUnits;
if (vals.length != formats.length) {
throw Exception(
'pack expected ${formats.length} items for packing (got ${formats.length})');
}
var buffer = RawWriter();
for (var i = 0; i < formats.length; i++) {
var f = formats[i];
var val = vals[i];
// c
if (f == 99) {
//assert(val >= 0 && val < 256);
buffer.writeInt8(val);
}
// b
else if (f == 98) {
//assert(val >= 0 && val < 256);
buffer.writeInt8(val);
}
//Int16 short 2 bytes h
else if (f == 104) {
buffer.writeInt16(val);
} //Int32 int 4 bytes i
else if (f == 105) {
buffer.writeInt32(val);
} else {
throw Exception('format unknow');
}
}
return buffer.toUint8List();
}
// Character code constants.
const int _b = 0x62, _c = 0x63, _h = 0x68, _i = 0x69, _q = 0x71;
const _formatSize = {
_h: 2,
_i: 4,
_c: 1,
_b: 1,
_q: 8,
};
/// Format C Type Python type Standard size
/// h short integer 2
/// i int integer 4
/// c char bytes of length 1 1
/// b signed char integer 1
/// q long long integer 8
/// from lrhn https://github.com/dart-lang/sdk/issues/50708
Uint8List packlrhn(String format, List<int> values) {
if (format.length != values.length) {
throw ArgumentError.value(values, "values",
"Expected ${format.length} values for format: $format");
}
var bufferSize = 0;
for (var i = 0; i < format.length; i++) {
bufferSize += _formatSize[format.codeUnitAt(i)] ??
(throw FormatException("Unknown format", format, i));
}
var buffer = ByteData(bufferSize);
var cursor = 0;
for (var i = 0; i < format.length; i++) {
var f = format.codeUnitAt(i);
var value = values[i];
switch (f) {
case _c:
buffer.setUint8(cursor++, value);
break;
case _b:
buffer.setInt8(cursor++, value);
break;
case _i:
buffer.setInt32(cursor, value);
cursor += 4;
break;
case _h:
buffer.setInt16(cursor, value);
cursor += 2;
break;
case _q: //writeInt64
buffer.setInt64(cursor, value);
cursor += 8;
break;
default:
assert(false, "unreachable");
}
}
assert(cursor == buffer.lengthInBytes); //length
return Uint8List.sublistView(buffer);
}
/// Format C Type Python type Standard size
/// h short integer 2
/// i int integer 4
/// c char bytes of length 1 1
/// b signed char integer 1
/// q long long integer 8
/// Q unsigned long long integer 8
List<int> unpack(String fmt, List<int> bytes, [int offset = 0]) {
var decodedNum = <int>[];
var buffer = Buffer();
if (offset == 0) {
buffer.append(bytes);
} else if (offset > 0) {
var bits = bytes.sublist(offset);
buffer.append(bits);
} else {
throw Exception('offset < 0');
}
//[105, 104, 99, 98, 113, 81]
//['i', 'h', 'c', 'b', 'q', 'Q']
final formats = fmt.codeUnits;
for (var i = 0; i < formats.length; i++) {
var f = formats[i];
// c
if (f == 99) {
decodedNum.add(buffer.readByte());
}
// b
else if (f == 98) {
decodedNum.add(buffer.readByte());
}
//Int16 short 2 bytes h
else if (f == 104) {
decodedNum.add(buffer.readInt16());
} //Int32 int 4 bytes i
else if (f == 105) {
decodedNum.add(buffer.readInt32());
} else {
throw Exception('format unknow');
}
}
return decodedNum;
}
/// Format | C Type | Python type | Standard size
/// h | short | integer | 2
/// i | int | integer | 4
/// c | char | bytes of length 1 | 1
/// b | signed char | integer | 1
/// q | long long | integer | 8
/// Q | unsigned long long | integer | 8
/// esta é a versão mais lenta
List<int> unpack2(String fmt, List<int> bytes, [int offset = 0]) {
var decodedNum = <int>[];
var buffer = ByteDataReader();
if (offset == 0) {
buffer.add(bytes);
} else if (offset > 0) {
var bits = bytes.sublist(offset);
buffer.add(bits);
} else {
throw Exception('offset < 0');
}
//[105, 104, 99, 98, 113, 81]
//['i', 'h', 'c', 'b', 'q', 'Q']
final formats = fmt.codeUnits;
for (var i = 0; i < formats.length; i++) {
var f = formats[i];
// c
if (f == 99) {
decodedNum.add(buffer.readByte());
}
// b
else if (f == 98) {
decodedNum.add(buffer.readByte());
}
//Int16 short 2 bytes h
else if (f == 104) {
decodedNum.add(buffer.readInt16());
} //Int32 int 4 bytes i
else if (f == 105) {
decodedNum.add(buffer.readInt32());
} else {
throw Exception('format unknow');
}
}
return decodedNum;
}
/// o mais rapido nos benchmarks usando terrier RawReader
List<int> unpack3(String fmt, List<int> bytes, [int offset = 0]) {
var decodedNum = <int>[];
RawReader buffer;
if (offset == 0) {
buffer = RawReader.withBytes(bytes);
} else if (offset > 0) {
var bits = bytes.sublist(offset);
buffer = RawReader.withBytes(bits);
} else {
throw Exception('offset < 0');
}
//[105, 104, 99, 98, 113, 81]
//['i', 'h', 'c', 'b', 'q', 'Q']
final formats = fmt.codeUnits;
for (var i = 0; i < formats.length; i++) {
var f = formats[i];
// c
if (f == 99) {
decodedNum.add(buffer.readByte());
}
// b
else if (f == 98) {
decodedNum.add(buffer.readByte());
}
//Int16 short 2 bytes h
else if (f == 104) {
decodedNum.add(buffer.readInt16());
} //Int32 int 4 bytes i
else if (f == 105) {
decodedNum.add(buffer.readInt32());
} else {
throw Exception('format unknow');
}
}
return decodedNum;
}
/// write char 1 byte
List<int> c_pack(int val) {
// return pack('c', [val]);
return [val];
}
/// read Byte
List<int> c_unpack(List<int> bytes, [int offset = 0]) {
//return unpack('c', bytes, offset);
if (offset != 0) {
return [bytes.first];
}
return [bytes.sublist(offset).first];
}
/// write Int32
/// pega valores não-byte (por exemplo, inteiros)
/// e os converte em bytes usando o formato "i" int de 4 bytes (Int32)
/// Minimum value of Int32: -2147483648
/// Maximum value of Int32: 2147483647
// List<int> i_pack(int val) {
// //return pack('i', [val]);
// var bytes = <int>[];
// //assert(val >= -2147483648 && val <= 2147483647);
// if (val < 0) val = 0x100000000 + val;
// int a = (val >> 24) & 0x000000FF;
// int b = (val >> 16) & 0x000000FF;
// int c = (val >> 8) & 0x000000FF;
// int d = val & 0x000000FF;
// //checar ordem
// bytes.add(a);
// bytes.add(b);
// bytes.add(c);
// bytes.add(d);
// return bytes;
// }
// /// read Int32
// /// Minimum value of Int32: -2147483648
// /// Maximum value of Int32: 2147483647
// List<int> i_unpack(List<int> bytes, [int offset = 0]) {
// //return unpack('i', bytes, offset);
// var buffer = Buffer();
// if (offset == 0) {
// buffer.append(bytes);
// } else if (offset > 0) {
// var bits = bytes.sublist(offset);
// buffer.append(bits);
// } else {
// throw Exception('offset < 0');
// }
// return [buffer.readInt32()];
// }
List<int> i_pack(
int val, [
Endian endian = Endian.big,
]) {
//return pack('i', [val]);
// ByteData data = ByteData(4);
// data.setInt32(0, val, endian);
// return data.buffer.asUint8List();
final result = Uint8List(4)..buffer.asByteData().setInt32(0, val, endian);
return result; //[...result]; //<int>[]..addAll(result);
}
List<int> i_unpack(List<int> bytes, [int offset = 0]) {
//return unpack2('i', bytes, offset);
// final data = ByteData.view(Uint8List.fromList(bytes).buffer);
// return [data.getInt32(offset)];
final result = Uint8List.fromList(bytes).buffer.asByteData().getInt32(offset);
return [result];
}
/// write Int16 short 2 bytes
/// Minimum value of Int16: -32768
/// Maximum value of Int16: 32767
List<int> h_pack(
int val, [
Endian endian = Endian.big,
]) {
//return pack('h', [val]);
// ByteData data = ByteData(2);
// data.setInt16(0, val, endian);
// return data.buffer.asUint8List();
final result = Uint8List(2)..buffer.asByteData().setInt16(0, val, endian);
return result;
//[...result]; //<int>[]..addAll(result);
}
/// read Int16 short 2 bytes
List<int> h_unpack(List<int> bytes, [int offset = 0]) {
//return unpack('h', bytes, offset);
final result = Uint8List.fromList(bytes).buffer.asByteData().getInt16(offset);
return [result];
}
/// write 2 Int32
List<int> ii_pack(
int val1,
int val2, [
Endian endian = Endian.big,
]) {
//return pack('ii', [val1, val2]);
final list = Uint8List(8);
final byteData = list.buffer.asByteData();
byteData.setInt32(0, val1, endian);
byteData.setInt32(4, val2, endian);
return list;
//[...list]; //<int>[]..addAll(result);
}
/// read 2 Int32
List<int> ii_unpack(List<int> bytes, [int offset = 0]) {
//return unpack3('ii', bytes, offset);
final list = Uint8List.fromList(bytes);
final byteData = list.buffer.asByteData();
return [byteData.getInt32(offset), byteData.getInt32(offset + 4)];
}
/// write Int32 Int16 | Int32 Int16 | Int32 Int16
List<int> ihihih_pack(
int val1, int val2, int val3, int val4, int val5, int val6,
[Endian endian = Endian.big]) {
//return pack('ihihih', [val1, val2, val3, val4, val5, val6]);
final list = Uint8List(18);
final byteData = list.buffer.asByteData();
byteData.setInt32(0, val1, endian);
byteData.setInt16(4, val2, endian);
byteData.setInt32(6, val3, endian);
byteData.setInt16(10, val4, endian);
byteData.setInt32(12, val5, endian);
byteData.setInt16(16, val6, endian);
return list;
// [...list]; //<int>[]..addAll(result);
}
/// read Int32 Int16 | Int32 Int16 | Int32 Int16
List<int> ihihih_unpack(List<int> bytes, [int offset = 0]) {
//return unpack('ihihih', bytes, offset);
final list = Uint8List.fromList(bytes);
final byteData = list.buffer.asByteData();
return [
byteData.getInt32(offset),
byteData.getInt16(offset + 4),
byteData.getInt32(offset + 6),
byteData.getInt16(offset + 10),
byteData.getInt32(offset + 12),
byteData.getInt16(offset + 16),
];
}
/// write one byte and Int32
List<int> ci_pack(int val1, int val2) {
return pack('ci', [val1, val2]);
}
/// read one byte and Int32
List<int> ci_unpack(List<int> bytes, [int offset = 0]) {
return unpack('ci', bytes, offset);
}
/// write one byte and Int16
List<int> bh_pack(int val1, int val2) {
return pack('bh', [val1, val2]);
}
/// read one byte and Int16
List<int> bh_unpack(List<int> bytes, [int offset = 0]) {
return unpack('bh', bytes, offset);
}
/// write 4 byte
List<int> cccc_pack(int val1, int val2, int val3, int val4) {
return pack('cccc', [val1, val2, val3, val4]);
}
/// read 4 byte
List<int> cccc_unpack(List<int> bytes, [int offset = 0]) {
return unpack('cccc', bytes, offset);
}