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completely rework the parsing structure because I now realize how frames work

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This commit is contained in:
Joel Wetzell
2023-09-10 23:40:06 -05:00
parent 7a1366303f
commit 17224d9319
9 changed files with 261 additions and 132 deletions
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parsers/common/index.js
+8 -2
View File
@@ -1,6 +1,6 @@
const Parser = require('binary-parser').Parser;
const PSN_PACKET_HEADER_PARSER = new Parser()
const ChunkParser = new Parser()
.uint16le('id')
.uint16le('data_len', {
formatter: (item) => {
@@ -15,6 +15,11 @@ const PSN_PACKET_HEADER_PARSER = new Parser()
return binary.charAt(0) === '1';
},
})
.buffer('chunk_data', {
length: 'data_len',
});
const HeaderParser = new Parser()
.uint64le('packet_timestamp')
.uint8('version_high')
.uint8('version_low')
@@ -23,5 +28,6 @@ const PSN_PACKET_HEADER_PARSER = new Parser()
.seek(4);
module.exports = {
PSN_PACKET_HEADER_PARSER,
ChunkParser,
HeaderParser,
};
parsers/data/index.js
+4 -26
View File
@@ -1,7 +1,6 @@
const { PSN_PACKET_HEADER_PARSER } = require('../common');
const Parser = require('binary-parser').Parser;
const PSN_DATA_TRACKER_FIELD_PARSER = new Parser()
const DataTrackerFieldParser = new Parser()
.uint16le('id')
.uint16le('data_len', {
formatter: (item) => {
@@ -48,30 +47,9 @@ const PSN_DATA_TRACKER_PARSER = new Parser()
length: 'data_len',
});
const PSN_DATA_TRACKER_LIST_PARSER = 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';
},
})
.array('trackers', { type: PSN_DATA_TRACKER_PARSER, lengthInBytes: 'data_len' });
const PSN_DATA_CHUNK_DATA_PARSER = new Parser()
.nest('packet_header', { type: PSN_PACKET_HEADER_PARSER })
.nest('tracker_list', { type: PSN_DATA_TRACKER_LIST_PARSER });
const DataTrackerListParser = new Parser().array('trackers', { type: PSN_DATA_TRACKER_PARSER, readUntil: 'eof' });
module.exports = {
PSN_DATA_CHUNK_DATA_PARSER,
PSN_DATA_TRACKER_FIELD_PARSER,
PSN_DATA_TRACKER_LIST_PARSER,
PSN_DATA_TRACKER_PARSER,
DataTrackerFieldParser,
DataTrackerListParser,
};
parsers/index.js
+1 -10
View File
@@ -1,6 +1,3 @@
const { PSN_DATA_CHUNK_DATA_PARSER } = require('./data');
const { PSN_INFO_CHUNK_DATA_PARSER } = require('./info');
const Parser = require('binary-parser').Parser;
const PSN_PACKET_PARSER = new Parser()
@@ -18,12 +15,6 @@ const PSN_PACKET_PARSER = new Parser()
return binary.charAt(0) === '1';
},
})
.choice('chunk_data', {
tag: 'id',
choices: {
0x6755: PSN_DATA_CHUNK_DATA_PARSER,
0x6756: PSN_INFO_CHUNK_DATA_PARSER,
},
});
.buffer('chunk_data', { readUntil: 'eof' });
module.exports = (buffer) => PSN_PACKET_PARSER.parse(buffer);
parsers/info/index.js
+4 -44
View File
@@ -1,24 +1,5 @@
const { PSN_PACKET_HEADER_PARSER } = require('../common');
const Parser = require('binary-parser').Parser;
const PSN_INFO_SYSTEM_NAME_PARSER = 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('system_name', { length: 'data_len' });
const PSN_INFO_TRACKER_NAME_PARSER = new Parser()
.uint16le('id')
.uint16le('data_len', {
@@ -55,32 +36,11 @@ const PSN_INFO_TRACKER_PARSER = new Parser()
type: PSN_INFO_TRACKER_NAME_PARSER,
});
const PSN_INFO_TRACKER_LIST_PARSER = 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';
},
})
.array('trackers', { type: PSN_INFO_TRACKER_PARSER, lengthInBytes: 'data_len' });
const InfoSystemNameParser = new Parser().string('system_name', { greedy: true });
const PSN_INFO_CHUNK_DATA_PARSER = new Parser()
.nest('packet_header', { type: PSN_PACKET_HEADER_PARSER })
.nest('system_name', { type: PSN_INFO_SYSTEM_NAME_PARSER })
.nest('tracker_list', { type: PSN_INFO_TRACKER_LIST_PARSER });
const InfoTrackerListParser = new Parser().array('trackers', { type: PSN_INFO_TRACKER_PARSER, readUntil: 'eof' });
module.exports = {
PSN_INFO_SYSTEM_NAME_PARSER,
PSN_INFO_TRACKER_NAME_PARSER,
PSN_INFO_TRACKER_PARSER,
PSN_INFO_TRACKER_LIST_PARSER,
PSN_INFO_CHUNK_DATA_PARSER,
InfoSystemNameParser,
InfoTrackerListParser,
};