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219 changes: 10 additions & 209 deletions README.md
Original file line number Diff line number Diff line change
@@ -1,212 +1,13 @@
# SYNOPSIS
[![NPM Package](https://img.shields.io/npm/v/wasm-json-toolkit.svg?style=flat-square)](https://www.npmjs.org/package/wasm-json-toolkit)
[![Build Status](https://img.shields.io/travis/ewasm/wasm-json-toolkit.svg?branch=master&style=flat-square)](https://travis-ci.org/ewasm/wasm-json-toolkit)
[![Coverage Status](https://img.shields.io/coveralls/ewasm/wasm-json-toolkit.svg?style=flat-square)](https://coveralls.io/r/ewasm/wasm-json-toolkit)
# wasm-json-toolkit

[![js-standard-style](https://cdn.rawgit.com/feross/standard/master/badge.svg)](https://github.com/feross/standard)
This repo is forked from [ewasm/wasm-json-toolkit](https://github.com/ewasm/wasm-json-toolkit),
with the following improvements:

A small toolkit for converting wasm binaries into json and back.
## Dev Log

# INSTALL
`npm install wasm-json-toolkit`

# USAGE
```javascript
const fs = require('fs')
const wasm2json = require('wasm-json-toolkit').wasm2json

const wasm = fs.readFileSync('./test.wasm')
const json = wasm2json(wasm)

console.log(JSON.stringify(json, null, 2))
```

# CLI
Install `-g` global for cli usage.

`wasm2json [FILE]` given a file containing a wasm module produces a json representation
`json2wasm [FILE]` given a file containing a json representation produces a wasm module

# API
# wasm2json

converts a wasm binary into a json representation

**Parameters**

- `Buffer` - The Webassembly Binary
- `filter` - `Set` containing the name of sections to parse. If no filter is given all sections will be parsed

Returns **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)**

# json2wasm

converts a json representation to a wasm binary

**Parameters**

- `Object`

Returns **[Buffer](https://nodejs.org/api/buffer.html)**

# text2json

converts text to json. The only text accepted is a simple list of opcode name and immediates

**Parameters**

- `String`

**Examples**

```javascript
const codeStr = `
i64.const 1
i64.const 2
i64.add
`
const json = text2json(codeStr)
```

Returns **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)**

# iterator

[iterator.js:12-58](https://github.com/ewasm/wasm-json-toolkit/blob/e9fdd9498451b39b84c1167e78dc4aad03b055bd/iterator.js#L12-L58 "Source code on GitHub")

The Module Iterator allows for iteration over a webassembly module's sections.
A section is wrapped in a section class. A section class instance allows you
append entries to a given section

**Examples**

```javascript
const it = new Iterator(wasm)
for (const section of it) {
console.log(section.type)
const json = section.toJSON()
}
```

## wasm

[iterator.js:26-32](https://github.com/ewasm/wasm-json-toolkit/blob/e9fdd9498451b39b84c1167e78dc4aad03b055bd/iterator.js#L26-L32 "Source code on GitHub")

if the orignal wasm module was modified then this will return the modified
wasm module

## iterator

[iterator.js:38-52](https://github.com/ewasm/wasm-json-toolkit/blob/e9fdd9498451b39b84c1167e78dc4aad03b055bd/iterator.js#L38-L52 "Source code on GitHub")

Iterates through the module's sections
return {Iterator.<Section>}

# Section

[iterator.js:64-110](https://github.com/ewasm/wasm-json-toolkit/blob/e9fdd9498451b39b84c1167e78dc4aad03b055bd/iterator.js#L64-L110 "Source code on GitHub")

The section class is always internal created by the Module class. And return
through the Module's iternator


## toJSON

[iterator.js:83-85](https://github.com/ewasm/wasm-json-toolkit/blob/e9fdd9498451b39b84c1167e78dc4aad03b055bd/iterator.js#L83-L85 "Source code on GitHub")

Parses the section and return the JSON repesentation of it
returns {Object}

## appendEntries

[iterator.js:92-109](https://github.com/ewasm/wasm-json-toolkit/blob/e9fdd9498451b39b84c1167e78dc4aad03b055bd/iterator.js#L92-L109 "Source code on GitHub")

Appends an array of entries to this section. NOTE: this will modify the
parent wasm module.

**Parameters**

- `entries` **Arrayy&lt;[Buffer](https://nodejs.org/api/buffer.html)>**


## exammple json output

wast
```
(module
(func $addTwo (param i32 i32) (result i32)
(i32.add
(get_local 0)
(get_local 1)))
(export "addTwo" (func $addTwo)))
```

wasm
```
0x010661646454776f00000a09010700200020016a0b
```

json
```
[
{
"name": "preramble",
"magic": [0,97,115,109],
"version": [13,0,0,0]
},
{
"name": "type",
"entries": [
{
"form": "func",
"params": ["i32","i32"],
"return_type": "i32"
}
]
},
{
"name": "function",
"entries": [0]
},
{
"name": "export",
"entries": [
{
"field_str": "addTwo",
"kind": "Function",
"index": 0
}
]
},
{
"name": "code",
"entries": [
{
"locals": [],
"code": [
{
"name": "get_local",
"immediaties": "0"
},
{
"name": "get_local",
"immediaties": "1"
},
{
"return_type": "i32",
"name": "add"
},
{
"name": "end"
}
]
}
]
}
]
```

# LICENSE
[MPL-2.0][LICENSE]

[LICENSE]: https://tldrlegal.com/license/mozilla-public-license-2.0-(mpl-2)
* `2024-04-17` [`699dbbc`](https://github.com/permaweb/wasm-json-toolkit/commit/699dbbcaab406cc657b16e82a850e385de417f84)
Add 5 missing opcodes
* `2024-04-17` [`3cafd9f`](https://github.com/permaweb/wasm-json-toolkit/commit/3cafd9fd9289484ee9a049a139e36bbd79effcf6)
Support threaded and memory64 memory flags
* `2024-04-18` [`42f92e8`](https://github.com/permaweb/wasm-json-toolkit/commit/42f92e83dc01d748e9f79a7f6d237c05c077297d)
Support for "Data Count" sections (section index 12)
18 changes: 13 additions & 5 deletions json2wasm.js
Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,8 @@ const SECTION_IDS = _exports.SECTION_IDS = {
'start': 8,
'element': 9,
'code': 10,
'data': 11
'data': 11,
'data_count': 12,
}

const OPCODES = _exports.OPCODES = {
Expand Down Expand Up @@ -216,8 +217,13 @@ const OPCODES = _exports.OPCODES = {
'i32.reinterpret/f32': 0xbc,
'i64.reinterpret/f64': 0xbd,
'f32.reinterpret/i32': 0xbe,
'f64.reinterpret/i64': 0xbf
}
'f64.reinterpret/i64': 0xbf,
'i32.extend8_s': 0xc0,
'i32.extend16_s': 0xc1,
'i64.extend8_s': 0xc2,
'i64.extend16_s': 0xc3,
'i64.extend32_s': 0xc4
};

_exports.typeGenerators = {
'function': (json, stream) => {
Expand All @@ -240,8 +246,8 @@ _exports.typeGenerators = {
* @param {Stream} stream
*/
memory: (json, stream) => {
leb.unsigned.write(Number(json.maximum !== undefined), stream) // the flags
leb.unsigned.write(json.intial, stream)
leb.unsigned.write(json.flags, stream)
leb.unsigned.write(json.initial, stream)

if (json.maximum !== undefined) {
leb.unsigned.write(json.maximum, stream)
Expand Down Expand Up @@ -405,6 +411,8 @@ _exports.generateSection = function (json, stream = new Stream()) {
payload.write(json.payload)
} else if (name === 'start') {
leb.unsigned.write(json.index, payload)
} else if (name === 'data_count') {
leb.unsigned.write(json.count, payload)
} else {
leb.unsigned.write(json.entries.length, payload)
for (let entry of json.entries) {
Expand Down
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