How to use bitsyntax - 10 common examples
To help you get started, we’ve selected a few bitsyntax examples, based on popular ways it is used in public projects.
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retrohacker / presentation / 2 / producer / producer / node_modules / amqplib / lib / frame.js View on Github 
FRAME_HEADER = constants.FRAME_HEADER,
FRAME_BODY = constants.FRAME_BODY,
FRAME_END = constants.FRAME_END;
var bodyCons =
Bits.builder(FRAME_BODY,
'channel:16, size:32, payload:size/binary',
FRAME_END);
// %%% TESTME possibly better to cons the first bit and write the
// second directly, in the absence of IO lists
module.exports.makeBodyFrame = function(channel, payload) {
return bodyCons({channel: channel, size: payload.length, payload: payload});
};
var frameHeaderPattern = Bits.matcher('type:8', 'channel:16',
'size:32', 'rest/binary');
function parseFrame(bin, max) {
var fh = frameHeaderPattern(bin);
if (fh) {
var size = fh.size, rest = fh.rest;
if (size > max) {
throw new Error('Frame size exceeds frame max');
}
else if (rest.length > size) {
if (rest[size] !== FRAME_END)
throw new Error('Invalid frame');
return {
type: fh.type,
channel: fh.channel,FRAME_HEADER = constants.FRAME_HEADER,
FRAME_BODY = constants.FRAME_BODY,
FRAME_END = constants.FRAME_END;
var bodyCons =
Bits.builder(FRAME_BODY,
'channel:16, size:32, payload:size/binary',
FRAME_END);
// %%% TESTME possibly better to cons the first bit and write the
// second directly, in the absence of IO lists
module.exports.makeBodyFrame = function(channel, payload) {
return bodyCons({channel: channel, size: payload.length, payload: payload});
};
var frameHeaderPattern = Bits.matcher('type:8', 'channel:16',
'size:32', 'rest/binary');
function parseFrame(bin, max) {
var fh = frameHeaderPattern(bin);
if (fh) {
var size = fh.size, rest = fh.rest;
if (size > max) {
throw new Error('Frame size exceeds frame max');
}
else if (rest.length > size) {
if (rest[size] !== FRAME_END)
throw new Error('Invalid frame');
return {
type: fh.type,
channel: fh.channel,octet short long size octets octet
In general I want to know those first three things straight away, so I
can discard frames early.
*/
// framing constants
var FRAME_METHOD = constants.FRAME_METHOD,
FRAME_HEARTBEAT = constants.FRAME_HEARTBEAT,
FRAME_HEADER = constants.FRAME_HEADER,
FRAME_BODY = constants.FRAME_BODY,
FRAME_END = constants.FRAME_END;
var bodyCons =
Bits.builder(FRAME_BODY,
'channel:16, size:32, payload:size/binary',
FRAME_END);
// %%% TESTME possibly better to cons the first bit and write the
// second directly, in the absence of IO lists
module.exports.makeBodyFrame = function(channel, payload) {
return bodyCons({channel: channel, size: payload.length, payload: payload});
};
var frameHeaderPattern = Bits.matcher('type:8', 'channel:16',
'size:32', 'rest/binary');
function parseFrame(bin, max) {
var fh = frameHeaderPattern(bin);
if (fh) {
var size = fh.size, rest = fh.rest;octet short long size octets octet
In general I want to know those first three things straight away, so I
can discard frames early.
*/
// framing constants
var FRAME_METHOD = constants.FRAME_METHOD,
FRAME_HEARTBEAT = constants.FRAME_HEARTBEAT,
FRAME_HEADER = constants.FRAME_HEADER,
FRAME_BODY = constants.FRAME_BODY,
FRAME_END = constants.FRAME_END;
var bodyCons =
Bits.builder(FRAME_BODY,
'channel:16, size:32, payload:size/binary',
FRAME_END);
// %%% TESTME possibly better to cons the first bit and write the
// second directly, in the absence of IO lists
module.exports.makeBodyFrame = function(channel, payload) {
return bodyCons({channel: channel, size: payload.length, payload: payload});
};
var frameHeaderPattern = Bits.matcher('type:8', 'channel:16',
'size:32', 'rest/binary');
function parseFrame(bin, max) {
var fh = frameHeaderPattern(bin);
if (fh) {
var size = fh.size, rest = fh.rest;it('bitsyntax parser 2', function() {
var buffer = new Buffer([0xA1, 0x3, 0x46, 0x4F, 0x4F]);
var parser = bitsyntax.parse('161:8, len:8, value:len/binary, rest/binary');
var matcher = bitsyntax.match(parser, buffer);
matcher.should.be.ok;
matcher.value.should.eql(new Buffer([0x46, 0x4F, 0x4F]));
});
it('should spit right version', function() {it('bitsyntax parser', function() {
var expected = new Buffer([0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80]);
var buffer = new Buffer([0x80, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80]);
var parser = bitsyntax.parse('128:8, value:8/binary, rest/binary');
var matcher = bitsyntax.match(parser, buffer);
matcher.should.be.ok;
matcher.value.should.eql(expected);
});
it('bitsyntax parser 2', function() {it('bitsyntax parser 2', function() {
var buffer = new Buffer([0xA1, 0x3, 0x46, 0x4F, 0x4F]);
var parser = bitsyntax.parse('161:8, len:8, value:len/binary, rest/binary');
var matcher = bitsyntax.match(parser, buffer);
matcher.should.be.ok;
matcher.value.should.eql(new Buffer([0x46, 0x4F, 0x4F]));
});
it('should spit right version', function() {payload: rest.slice(0, size),
rest: rest.slice(size + 1)
};
}
}
return false;
}
module.exports.parseFrame = parseFrame;
var headerPattern = Bits.matcher('class:16',
'_weight:16',
'size:64',
'flagsAndfields/binary');
var methodPattern = Bits.matcher('id:32, args/binary');
var HEARTBEAT = {channel: 0};
module.exports.decodeFrame = function(frame) {
var payload = frame.payload;
switch (frame.type) {
case FRAME_METHOD:
var idAndArgs = methodPattern(payload);
var id = idAndArgs.id;
var fields = decode(id, idAndArgs.args);
return {id: id, channel: frame.channel, fields: fields};
case FRAME_HEADER:
var parts = headerPattern(payload);
var id = parts['class'];
var fields = decode(id, parts.flagsAndfields);
return {id: id, channel: frame.channel,return {
type: fh.type,
channel: fh.channel,
size: size,
payload: rest.slice(0, size),
rest: rest.slice(size + 1)
};
}
}
return false;
}
module.exports.parseFrame = parseFrame;
var headerPattern = Bits.matcher('class:16',
'_weight:16',
'size:64',
'flagsAndfields/binary');
var methodPattern = Bits.matcher('id:32, args/binary');
var HEARTBEAT = {channel: 0};
module.exports.decodeFrame = function(frame) {
var payload = frame.payload;
switch (frame.type) {
case FRAME_METHOD:
var idAndArgs = methodPattern(payload);
var id = idAndArgs.id;
var fields = decode(id, idAndArgs.args);
return {id: id, channel: frame.channel, fields: fields};return {
type: fh.type,
channel: fh.channel,
size: size,
payload: rest.slice(0, size),
rest: rest.slice(size + 1)
};
}
}
return false;
}
module.exports.parseFrame = parseFrame;
var headerPattern = Bits.matcher('class:16',
'_weight:16',
'size:64',
'flagsAndfields/binary');
var methodPattern = Bits.matcher('id:32, args/binary');
var HEARTBEAT = {channel: 0};
module.exports.decodeFrame = function(frame) {
var payload = frame.payload;
switch (frame.type) {
case FRAME_METHOD:
var idAndArgs = methodPattern(payload);
var id = idAndArgs.id;
var fields = decode(id, idAndArgs.args);
return {id: id, channel: frame.channel, fields: fields};
