fix(bufferutils): remove pushdata re-exports

Remove these exports:

* `bufferutils.pushDataSize`
* `bufferutils.readPushDataInt`
* `bufferutils.writePushDataInt`

They are not needed and are already removed upstream.

While this changes the public API, none of our projects use these
functions.

Issue: BG-16466

package.json

@@ -19,7 +19,7 @@
   "scripts": {
     "coverage-report": "nyc report --reporter=lcov",
     "coverage-html": "nyc report --reporter=html",
-    "coverage": "BITGO_UTXO_LIB_TEST_EXPECTED_COUNT=3535 nyc --check-coverage --branches 90 --functions 90 mocha --recursive",
+    "coverage": "BITGO_UTXO_LIB_TEST_EXPECTED_COUNT=3496 nyc --check-coverage --branches 90 --functions 90 mocha --recursive",
     "integration": "mocha test/integration/",
     "standard": "standard",
     "test": "npm run standard && npm run coverage",

src/bufferutils.js

@@ -1,4 +1,3 @@
-var pushdata = require('pushdata-bitcoin')
 var varuint = require('varuint-bitcoin')
 
 // https://github.com/feross/buffer/blob/master/index.js#L1127
@@ -52,14 +51,11 @@ function writeVarInt (buffer, number, offset) {
 }
 
 module.exports = {
-  pushDataSize: pushdata.encodingLength,
-  readPushDataInt: pushdata.decode,
   readUInt64LE: readUInt64LE,
   readInt64LE: readInt64LE,
   readVarInt: readVarInt,
   varIntBuffer: varuint.encode,
   varIntSize: varuint.encodingLength,
-  writePushDataInt: pushdata.encode,
   writeUInt64LE: writeUInt64LE,
   writeVarInt: writeVarInt
 }

test/bufferutils.js

@@ -6,45 +6,6 @@ var bufferutils = require('../src/bufferutils')
 var fixtures = require('./fixtures/bufferutils.json')
 
 describe('bufferutils', function () {
-  describe('pushDataSize', function () {
-    fixtures.valid.forEach(function (f) {
-      it('determines the pushDataSize of ' + f.dec + ' correctly', function () {
-        if (!f.hexPD) return
-
-        var size = bufferutils.pushDataSize(f.dec)
-
-        assert.strictEqual(size, f.hexPD.length / 2)
-      })
-    })
-  })
-
-  describe('readPushDataInt', function () {
-    fixtures.valid.forEach(function (f) {
-      if (!f.hexPD) return
-
-      it('decodes ' + f.hexPD + ' correctly', function () {
-        var buffer = Buffer.from(f.hexPD, 'hex')
-        var d = bufferutils.readPushDataInt(buffer, 0)
-        var fopcode = parseInt(f.hexPD.substr(0, 2), 16)
-
-        assert.strictEqual(d.opcode, fopcode)
-        assert.strictEqual(d.number, f.dec)
-        assert.strictEqual(d.size, buffer.length)
-      })
-    })
-
-    fixtures.invalid.readPushDataInt.forEach(function (f) {
-      if (!f.hexPD) return
-
-      it('decodes ' + f.hexPD + ' as null', function () {
-        var buffer = Buffer.from(f.hexPD, 'hex')
-
-        var n = bufferutils.readPushDataInt(buffer, 0)
-        assert.strictEqual(n, null)
-      })
-    })
-  })
-
   describe('readInt64LE', function () {
     fixtures.negative.forEach(function (f) {
       it('decodes ' + f.hex64 + ' correctly', function () {
@@ -119,19 +80,6 @@ describe('bufferutils', function () {
     })
   })
 
-  describe('writePushDataInt', function () {
-    fixtures.valid.forEach(function (f) {
-      if (!f.hexPD) return
-
-      it('encodes ' + f.dec + ' correctly', function () {
-        var buffer = Buffer.alloc(5, 0)
-
-        var n = bufferutils.writePushDataInt(buffer, f.dec, 0)
-        assert.strictEqual(buffer.slice(0, n).toString('hex'), f.hexPD)
-      })
-    })
-  })
-
   describe('writeUInt64LE', function () {
     fixtures.valid.forEach(function (f) {
       it('encodes ' + f.dec + ' correctly', function () {

test/fixtures/bufferutils.json

@@ -98,20 +98,6 @@
         "hexVI": "ff0100000000000020",
         "dec": 9007199254740993
       }
-    ],
-    "readPushDataInt": [
-      {
-        "description": "OP_PUSHDATA1, no size",
-        "hexPD": "4c"
-      },
-      {
-        "description": "OP_PUSHDATA2, no size",
-        "hexPD": "4d"
-      },
-      {
-        "description": "OP_PUSHDATA4, no size",
-        "hexPD": "4e"
-      }
     ]
   },
   "negative": [