Decode binary ledger header data

packages/ripple-binary-codec/src/index.js

@@ -6,7 +6,24 @@ const {quality,
                 signingClaimData,
                 multiSigningData,
                 binaryToJSON,
-                serializeObject}} = coreTypes;
+                serializeObject,
+                BinaryParser}} = coreTypes;
+
+function decodeLedgerData(binary) {
+  assert(typeof binary === 'string', 'binary must be a hex string');
+  const parser = new BinaryParser(binary)
+  return {
+    ledger_index:          parser.readUInt32(),
+    total_coins:           parser.readType(coreTypes.UInt64).valueOf().toString(),
+    parent_hash:           parser.readType(coreTypes.Hash256).toHex(),
+    transaction_hash:      parser.readType(coreTypes.Hash256).toHex(),
+    account_hash:          parser.readType(coreTypes.Hash256).toHex(),
+    parent_close_time:     parser.readUInt32(),
+    close_time:            parser.readUInt32(),
+    close_time_resolution: parser.readUInt8(),
+    close_flags:           parser.readUInt8()
+  }
+}
 
 function decode(binary) {
   assert(typeof binary === 'string', 'binary must be a hex string');
@@ -51,5 +68,6 @@ module.exports = {
   encodeForSigningClaim,
   encodeForMultisigning,
   encodeQuality,
-  decodeQuality
+  decodeQuality,
+  decodeLedgerData
 };

packages/ripple-binary-codec/test/binary-json-test.js

@@ -1,6 +1,6 @@
 const assert = require('assert');
 const fixtures = require('./fixtures/codec-fixtures.json');
-const {decode, encode} = require('../src');
+const {decode, encode, decodeLedgerData} = require('../src');
 
 function json(object) {
   return JSON.stringify(object);
@@ -24,4 +24,14 @@ describe('ripple-binary-codec', function() {
   }
   makeSuite('transactions', fixtures.transactions);
   makeSuite('accountState', fixtures.accountState);
+
+  describe('ledgerData', function() {
+    fixtures.ledgerData.forEach((t, test_n) => {
+      it(`ledgerData[${test_n}] can decode ${t.binary} to ${json(t.json)}`,
+      () => {
+        const decoded = decodeLedgerData(t.binary);
+        assert.deepEqual(t.json, decoded);
+      });
+    });
+  })
 });

packages/ripple-binary-codec/test/fixtures/codec-fixtures.json

@@ -4448,5 +4448,19 @@
       "Flags": 0,
       "Sequence": 62
     }
+  }],
+  "ledgerData": [{
+    "binary": "01E91435016340767BF1C4A3EACEB081770D8ADE216C85445DD6FB002C6B5A2930F2DECE006DA18150CB18F6DD33F6F0990754C962A7CCE62F332FF9C13939B03B864117F0BDA86B6E9B4F873B5C3E520634D343EF5D9D9A4246643D64DAD278BA95DC0EAC6EB5350CF970D521276CDE21276CE60A00",
+    "json": {
+      "account_hash": "3B5C3E520634D343EF5D9D9A4246643D64DAD278BA95DC0EAC6EB5350CF970D5",
+      "close_flags": 0,
+      "close_time": 556231910,
+      "close_time_resolution": 10,
+      "ledger_index": 32052277,
+      "parent_close_time": 556231902,
+      "parent_hash": "EACEB081770D8ADE216C85445DD6FB002C6B5A2930F2DECE006DA18150CB18F6",
+      "total_coins": "99994494362043555",
+      "transaction_hash": "DD33F6F0990754C962A7CCE62F332FF9C13939B03B864117F0BDA86B6E9B4F87"
+    }
   }]
 }