organization

src/decoders/chunk.js

@@ -0,0 +1,20 @@
+const { Parser } = require('binary-parser');
+
+module.exports = new Parser()
+  .uint16le('id')
+  .uint16le('data_len', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return Number.parseInt(binary.substring(1), 2);
+    },
+  })
+  .seek(-2)
+  .uint16le('has_subchunks', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return binary.charAt(0) === '1';
+    },
+  })
+  .buffer('chunk_data', {
+    length: 'data_len',
+  });

src/decoders/data/data-tracker-field-chunk.js

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+const Parser = require('binary-parser').Parser;
+
+module.exports = new Parser()
+  .uint16le('id')
+  .uint16le('data_len', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return Number.parseInt(binary.substring(1), 2);
+    },
+  })
+  .seek(-2)
+  .uint16le('has_subchunks', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return binary.charAt(0) === '1';
+    },
+  })
+  .choice('data', {
+    tag: 'id',
+    choices: {
+      0x0000: new Parser().floatle('x').floatle('y').floatle('z'),
+      0x0001: new Parser().floatle('x').floatle('y').floatle('z'),
+      0x0002: new Parser().floatle('x').floatle('y').floatle('z'),
+      0x0003: new Parser().floatle('validity'),
+      0x0004: new Parser().floatle('x').floatle('y').floatle('z'),
+      0x0005: new Parser().floatle('x').floatle('y').floatle('z'),
+      0x0006: new Parser().uint64le('tracker_timestamp'),
+    },
+  });

src/decoders/data/data-tracker-list-chunk.js

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+const Parser = require('binary-parser').Parser;
+
+const dataTrackerParser = new Parser()
+  .uint16le('id')
+  .uint16le('data_len', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return Number.parseInt(binary.substring(1), 2);
+    },
+  })
+  .seek(-2)
+  .uint16le('has_subchunks', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return binary.charAt(0) === '1';
+    },
+  })
+  .buffer('data', {
+    length: 'data_len',
+  });
+
+module.exports = new Parser().array('trackers', { type: dataTrackerParser, readUntil: 'eof' });

src/decoders/data/index.js

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+const TrackerListChunk = require('./data-tracker-list-chunk');
+const TrackerFieldChunk = require('./data-tracker-field-chunk');
+
+module.exports = {
+  TrackerFieldChunk,
+  TrackerListChunk,
+};

src/decoders/index.js

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+const Chunk = require('./chunk');
+const PacketHeaderChunk = require('./packet-header-chunk');
+const Packet = require('./packet');
+const Info = require('./info');
+const Data = require('./data');
+
+module.exports = {
+  Chunk,
+  PacketHeaderChunk,
+  Packet,
+  Info: {
+    ...Info,
+  },
+  Data: {
+    ...Data,
+  },
+};

src/decoders/info/index.js

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+const SystemNameChunk = require('./info-system-name-chunk');
+const TrackerListChunk = require('./info-tracker-list-chunk');
+
+module.exports = {
+  SystemNameChunk,
+  TrackerListChunk,
+};

src/decoders/info/info-system-name-chunk.js

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+const Parser = require('binary-parser').Parser;
+
+module.exports = new Parser().string('system_name', { greedy: true });

src/decoders/info/info-tracker-list-chunk.js

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+const Parser = require('binary-parser').Parser;
+
+const infoTrackerNameParser = new Parser()
+  .uint16le('id')
+  .uint16le('data_len', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return Number.parseInt(binary.substring(1), 2);
+    },
+  })
+  .seek(-2)
+  .uint16le('has_subchunks', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return binary.charAt(0) === '1';
+    },
+  })
+  .string('tracker_name', { length: 'data_len' });
+
+const infoTrackerParser = new Parser()
+  .uint16le('id')
+  .uint16le('data_len', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return Number.parseInt(binary.substring(1), 2);
+    },
+  })
+  .seek(-2)
+  .uint16le('has_subchunks', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return binary.charAt(0) === '1';
+    },
+  })
+  .nest('tracker_name', {
+    type: infoTrackerNameParser,
+  });
+
+module.exports = new Parser().array('trackers', { type: infoTrackerParser, readUntil: 'eof' });

src/decoders/packet-header-chunk.js

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+const Parser = require('binary-parser').Parser;
+
+module.exports = new Parser()
+  .uint64le('packet_timestamp')
+  .uint8('version_high')
+  .uint8('version_low')
+  .uint8('frame_id')
+  .uint8('frame_packet_count')
+  .seek(4);

src/decoders/packet.js

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+const Parser = require('binary-parser').Parser;
+
+module.exports = new Parser()
+  .uint16le('id')
+  .uint16le('data_len', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return Number.parseInt(binary.substring(1), 2);
+    },
+  })
+  .seek(-2)
+  .uint16le('has_subchunks', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return binary.charAt(0) === '1';
+    },
+  })
+  .buffer('chunk_data', { readUntil: 'eof' });