Ten skrypt nie powinien być instalowany bezpośrednio. Jest to biblioteka dla innych skyptów do włączenia dyrektywą meta // @require https://update.greasyfork.org/scripts/436749/1013324/wasm_patcher.js
// ==UserScript==
// @name Wasm Patcher
// @version 0.1
// @description WebAssemblyのbufferにパッチを当てる
// @author nekocell
// @namespace https://greasyfork.org/ja/users/762895-nekocell
// ==/UserScript==
class BufferReader {
constructor(buffer) {
this._buffer = buffer.slice(0);
this._pos = 0;
}
get finished() {
return this._pos >= this._buffer.length;
}
get length() {
return this._buffer.length;
}
reset() {
this._pos = 0;
}
readU8() {
return this._buffer[this._pos++];
}
readU32() {
return this.readU8() |
(this.readU8() << 8) |
(this.readU8() << 16) |
(this.readU8() << 24);
}
readVarU32() {
let result = 0;
let shift = 0;
let currentByte;
do {
currentByte = this.readU8();
result |= (currentByte & 0x7F) << shift;
shift += 7;
} while (currentByte & 0x80);
return result;
}
readBytes(count) {
const bytes = []
for (let i = 0; i < count; i++) {
bytes.push(this.readU8());
}
return bytes;
}
readBytesToEnd() {
const bytes = []
while (!this.finished) {
bytes.push(this.readU8());
}
return bytes;
}
}
class BufferBuilder {
constructor() {
this._buffer = new Uint8Array(100);
this._pos = 0;
}
get length() {
return this._pos;
}
_resizeBuffer() {
if (this._pos >= this._buffer.length - 1) {
let tmp = this._buffer;
this._buffer = new Uint8Array(this._buffer.length * 2);
this._buffer.set(tmp);
}
}
pushU8(val) {
this._resizeBuffer();
this._buffer[this._pos++] = val;
}
pushU32(val) {
this.pushU8(val & 0x000000ff);
this.pushU8((val & 0x0000ff00) >> 8);
this.pushU8((val & 0x00ff0000) >> 16);
this.pushU8((val & 0xff000000) >> 24);
}
pushVarU32(val) {
let byte = 0;
let value = val;
if (val == 0) {
this.pushU8(0);
return;
}
while (value > 0) {
byte = value & 0x7F;
value >>= 7;
if (value !== 0) {
byte |= 0x80;
}
this.pushU8(byte);
}
}
pushBytes(bytes) {
for (let i = 0; i < bytes.length; i++) {
this.pushU8(bytes[i]);
}
}
build() {
return this._buffer.slice(0, this._pos);
}
}
const Section = Object.freeze({
Custom: 0x00,
Type: 0x01,
Import: 0x02,
Function: 0x03,
Table: 0x04,
Memory: 0x05,
Global: 0x06,
Export: 0x07,
Start: 0x08,
Element: 0x09,
Code: 0x0A,
Data: 0x0B,
DataCount: 0x0C,
});
const ValueType = Object.freeze({
i32: 0x7F,
i64: 0x7E,
f32: 0x7D,
f64: 0x7C
});
const SignatureType = Object.freeze({
func: 0x60
});
const ExternalKind = Object.freeze({
Function: 0x00,
Table: 0x01,
Memory: 0x02,
Global: 0x03
});
const OP = Object.freeze({
unreachable: 0x00,
nop: 0x01,
block: 0x02,
loop: 0x02,
if: [0x04, 0x40],
else: 0x05,
end: 0x0B,
return: 0x0F,
drop: 0x1A,
local: {
get: 0x20,
set: 0x21,
},
global: {
get: 0x23,
set: 0x24,
},
i32: {
load: 0x28,
store: 0x36,
const: 0x41,
eq: 0x46,
add: 0x6A,
sub: 0x6B,
mul: 0x6C,
},
i64: {
load: 0x29,
store: 0x37,
const: 0x41,
},
f32: {
load: 0x2A,
store: 0x38,
const: 0x43,
mul: 0x94,
},
f64: {
load: 0x2B,
store: 0x39,
const: 0x44,
},
});
const VAR = Object.freeze({
u32: (val) => {
const result = [];
let value = val;
if (val === 0) {
return [0];
}
while (value > 0) {
const byte = value & 0x7F;
value >>= 7;
if (value !== 0) {
byte |= 0x80;
}
result.push(byte);
}
return result;
},
s32: (value) => {
const result = [];
while (true) {
const byte = value & 0x7f;
value >>= 7;
if ((value === 0 && (byte & 0x40) === 0) ||
(value === -1 && (byte & 0x40) !== 0)
) {
result.push(byte);
return result;
}
result.push(byte | 0x80);
}
},
f32: (value) => {
const f32ary = new Float32Array([value]);
const f32bytes = new Uint8Array(f32ary.buffer);
return [...f32bytes];
},
f64: (value) => {
const f64ary = new Float64Array([value]);
const f64bytes = new Uint8Array(f64ary.buffer);
return [...f64bytes];
}
});
class WasmIndex {
constructor(index) {
this._index = index;
}
}
class WasmPatcher {
constructor(wasmBuffer) {
this._oldWasm = new BufferReader(new Uint8Array(wasmBuffer));
this._newWasm = new BufferBuilder();
this._importFunctionCount = 0;
this._importGlobalCount = 0;
this._aobPatchEntries = [];
this._aobPatchFinished = false;
this._addFunctionEntries = [];
this._addGlobalVariableEntries = [];
}
_string2bytes(string) {
let bytes = [];
for (let i = 0; i < string.length; i++) {
let code = string.charCodeAt(i);
bytes.push(code);
}
return bytes;
}
_string2type(string) {
switch (string) {
case 's32':
case 'u32':
case 'i32': return ValueType.i32;
case 's64':
case 'u64':
case 'i64': return ValueType.i64;
case 'f32': return ValueType.f32;
case 'f64': return ValueType.f64;
default: throw new Error("Invalid string");
}
}
_createInstantiationTimeInitializer(typeString, value) {
switch (typeString) {
case 'u32': return [OP.i32.const, ...VAR.u32(value), OP.end];
case 's32': return [OP.i32.const, ...VAR.s32(value), OP.end];
//case 'i64': return ValueType.i64;
case 'f32': return [OP.f32.const, ...VAR.f32(value), OP.end];
case 'f64': return [OP.f64.const, ...VAR.f64(value), OP.end];
default: throw new Error("Invalid string");
}
}
_parseTypeSection() {
const sectionLen = this._oldWasm.readVarU32();
const sectionBody = this._oldWasm.readBytes(sectionLen);
const oldSection = new BufferReader(sectionBody);
const newSection = new BufferBuilder();
//TODO 既存のTypeIndexと紐付け なかったらついか
// がいいけどめんどいから 追加だけ
const addFunctionEntries = this._addFunctionEntries;
const oldTypeCount = oldSection.readVarU32();
const newTypeCount = oldTypeCount + addFunctionEntries.length;
newSection.pushVarU32(newTypeCount);
for (let i = 0; i < oldTypeCount; ++i) {
const form = oldSection.readU8();
const paramCount = oldSection.readVarU32();
let params = [];
for (let j = 0; j < paramCount; ++j) {
const param = oldSection.readU8();
params.push(param);
}
const returnCount = oldSection.readU8();
let returnType;
newSection.pushU8(form);
newSection.pushVarU32(paramCount);
newSection.pushBytes(params);
newSection.pushU8(returnCount);
if (returnCount === 1) {
returnType = oldSection.readU8();
newSection.pushU8(returnType);
}
}
for (let i = 0; i < addFunctionEntries.length; ++i) {
const entry = addFunctionEntries[i];
const form = SignatureType.func;
const params = entry.params;
newSection.pushU8(form);
newSection.pushVarU32(params.length);
newSection.pushBytes(params);
let returnType = entry.return;
if (returnType) {
newSection.pushU8(1);
newSection.pushU8(returnType);
}
else {
newSection.pushU8(0);
}
entry._typeIndex = i + oldTypeCount;
}
this._newWasm.pushVarU32(newSection.length);
this._newWasm.pushBytes(newSection.build());
}
_parseImportSection() {
const sectionLen = this._oldWasm.readVarU32();
const sectionBody = this._oldWasm.readBytes(sectionLen);
const oldSection = new BufferReader(sectionBody);
const newSection = new BufferBuilder();
const addFunctionEntries = this._addFunctionEntries;
const importCount = oldSection.readVarU32();
newSection.pushVarU32(importCount);
for (let i = 0; i < importCount; ++i) {
const moduleNameLen = oldSection.readVarU32();
const moduleName = oldSection.readBytes(moduleNameLen);
const exportNameLen = oldSection.readVarU32();
const exportName = oldSection.readBytes(exportNameLen);
newSection.pushVarU32(moduleNameLen);
newSection.pushBytes(moduleName);
newSection.pushVarU32(exportNameLen);
newSection.pushBytes(exportName);
const kind = oldSection.readU8();
newSection.pushU8(kind);
switch (kind) {
case ExternalKind.Function:
this._importFunctionCount++;
const typeIndex = oldSection.readVarU32();
newSection.pushVarU32(typeIndex);
break;
case ExternalKind.Table:
const elementType = oldSection.readU8();
const resizableFlags = oldSection.readU8();
const resizableMinimum = oldSection.readVarU32();
newSection.pushU8(elementType);
newSection.pushU8(resizableFlags);
newSection.pushVarU32(resizableMinimum);
if (resizableFlags) {
const resizableMaximum = oldSection.readVarU32();
newSection.pushVarU32(resizableMaximum);
}
break;
case ExternalKind.Memory:
const limitsFlags = oldSection.readU8();
const limitsMinimum = oldSection.readVarU32();
newSection.pushU8(limitsFlags);
newSection.pushVarU32(limitsMinimum);
if (limitsFlags) {
const limitsMaximum = oldSection.readVarU32();
newSection.pushVarU32(limitsMinimum);
}
break;
case ExternalKind.Global:
this._importGlobalCount++;
const variableType = oldSection.readU8();
const variableMutability = oldSection.readU8();
newSection.pushU8(variableType);
newSection.pushU8(variableMutability);
break;
default:
throw new Error("Invalid Import kind");
}
}
this._newWasm.pushVarU32(newSection.length);
this._newWasm.pushBytes(newSection.build());
}
_readInstantiationTimeInitializer(reader, builder) {
let byte;
while ((byte = reader.readU8()) !== OP.end) {
builder.pushU8(byte);
switch (byte) {
case OP.i32.const:
case OP.i64.const: {
const value = reader.readVarU32();
builder.pushVarU32(value);
break;
}
case OP.f32.const: {
const valueBytes = reader.readBytes(4);
builder.pushVarU32(valueBytes);
break;
}
case OP.f64.const: {
const valueBytes = reader.readBytes(8);
builder.pushVarU32(valueBytes);
break;
}
case OP.global.get: {
const index = reader.readVarU32();
builder.pushVarU32(index);
break;
}
default:
throw new Error("Invalid byte");
}
}
builder.pushU8(OP.end);
}
_parseGlobalSection() {
const sectionLen = this._oldWasm.readVarU32();
const sectionBody = this._oldWasm.readBytes(sectionLen);
const oldSection = new BufferReader(sectionBody);
const newSection = new BufferBuilder();
const addGlobalVariableEntries = this._addGlobalVariableEntries;
const oldGlobalCount = oldSection.readVarU32();
const newGlobalCount = oldGlobalCount + addGlobalVariableEntries.length;
newSection.pushVarU32(newGlobalCount);
for (let i = 0; i < oldGlobalCount; ++i) {
const contentType = oldSection.readU8();
const mutability = oldSection.readU8();
newSection.pushU8(contentType);
newSection.pushU8(mutability);
this._readInstantiationTimeInitializer(oldSection, newSection);
}
const newGlobalBaseIndex = this._importGlobalCount + oldGlobalCount;
for (let i = 0; i < addGlobalVariableEntries.length; ++i) {
const entry = addGlobalVariableEntries[i];
const contentType = entry.type;
const mutability = entry.mutability;
const initializer = entry.initializer;
newSection.pushU8(contentType);
newSection.pushU8(mutability);
newSection.pushBytes(initializer);
entry.globalIndex._index = newGlobalBaseIndex + i;
}
this._newWasm.pushVarU32(newSection.length);
this._newWasm.pushBytes(newSection.build());
}
_parseFunctionSection() {
const sectionLen = this._oldWasm.readVarU32();
const sectionBody = this._oldWasm.readBytes(sectionLen);
const oldSection = new BufferReader(sectionBody);
const newSection = new BufferBuilder();
const addFunctionEntries = this._addFunctionEntries;
const oldFuncCount = oldSection.readVarU32();
const newFuncCount = oldFuncCount + addFunctionEntries.length;
newSection.pushVarU32(newFuncCount);
for (let i = 0; i < oldFuncCount; ++i) {
const typeIndex = oldSection.readVarU32();
newSection.pushVarU32(typeIndex);
}
const newFuncBaseIndex = this._importFunctionCount + oldFuncCount;
for (let i = 0; i < addFunctionEntries.length; ++i) {
const entry = addFunctionEntries[i];
const typeIndex = entry._typeIndex;
newSection.pushVarU32(typeIndex);
entry.functionIndex._index = newFuncBaseIndex + i;
}
this._newWasm.pushVarU32(newSection.length);
this._newWasm.pushBytes(newSection.build());
}
_parseExportSection() {
const sectionLen = this._oldWasm.readVarU32();
const sectionBody = this._oldWasm.readBytes(sectionLen);
const oldSection = new BufferReader(sectionBody);
const newSection = new BufferBuilder();
const addFunctionEntries = this._addFunctionEntries;
const addFunctionExportEntries = addFunctionEntries.filter(entry => {
return entry?.exportName instanceof Array
});
const addGlobalVariableEntries = this._addGlobalVariableEntries;
const addGlobalVariableExportEntries = addGlobalVariableEntries.filter(entry => {
return entry?.exportName instanceof Array
})
const oldExportCount = oldSection.readVarU32();
const newExportCount = oldExportCount +
addFunctionExportEntries.length +
addGlobalVariableExportEntries.length;
newSection.pushVarU32(newExportCount);
for (let i = 0; i < oldExportCount; ++i) {
const fieldNameLen = oldSection.readVarU32();
const fieldName = oldSection.readBytes(fieldNameLen);
const kind = oldSection.readU8();
const index = oldSection.readVarU32();
newSection.pushVarU32(fieldNameLen);
newSection.pushBytes(fieldName);
newSection.pushU8(kind);
newSection.pushVarU32(index);
}
for (let i = 0; i < addFunctionExportEntries.length; ++i) {
const entry = addFunctionExportEntries[i];
const fieldNameLen = entry.exportName.length;
const fieldName = entry.exportName;
const kind = ExternalKind.Function;
const index = entry.functionIndex._index;
newSection.pushVarU32(fieldNameLen);
newSection.pushBytes(fieldName);
newSection.pushU8(kind);
newSection.pushVarU32(index);
}
for (let i = 0; i < addGlobalVariableExportEntries.length; ++i) {
const entry = addGlobalVariableExportEntries[i];
const fieldNameLen = entry.exportName.length;
const fieldName = entry.exportName;
const kind = ExternalKind.Global;
const index = entry.globalIndex._index;
newSection.pushVarU32(fieldNameLen);
newSection.pushBytes(fieldName);
newSection.pushU8(kind);
newSection.pushVarU32(index);
}
this._newWasm.pushVarU32(newSection.length);
this._newWasm.pushBytes(newSection.build());
}
_expandCodes(codes) {
return codes.map(code => {
let newCode = [];
code.forEach(c => {
if (c instanceof WasmIndex) {
newCode.push(...VAR.u32(c._index));
} else {
newCode.push(c);
}
});
return newCode;
});
}
_expandCode(code) {
let newCode = [];
code.forEach(part => {
console.log(part)
if (part instanceof WasmIndex) {
newCode.push(...VAR.u32(part._index));
}
else {
newCode.push(part);
}
})
return newCode;
}
_aobScan(data, scan) {
let scanIndex = 0;
for (let i = 0; i < data.length;) {
const val = data[i];
const scanNow = scan[scanIndex];
const scanMode = scanNow.mode;
let scanVal;
switch (scanMode) {
case 'insert':
case 'replace_start':
case 'replace_end':
scanIndex++;
break;
case 'skip':
scanIndex++;
i++;
break;
case 'value':
scanVal = scanNow.value;
if (val === scanVal) {
scanIndex++;
}
else {
scanIndex = 0;
}
i++;
break;
}
if (scanIndex === scan.length) {
return i - 1;
}
}
return -1;
}
_applyAobPatch(oldBody) {
let body = oldBody;
let newBody = null;
let alldone = true;
this._aobPatchEntries.forEach(entry => {
if (entry.done) return;
alldone = false;
const scan = entry.scan;
const matchIndex = this._aobScan(body, scan);
if (matchIndex === -1) return;
const oldBodyReader = new BufferReader(body);
const newBodyBuilder = new BufferBuilder();
const totalMatches = entry.totalMatches;
const matchEndIndex = matchIndex;
const matchFirstIndex = matchEndIndex - totalMatches + 1;
const beforeMatchBytes = oldBodyReader.readBytes(matchFirstIndex);
const matchBytes = oldBodyReader.readBytes(matchEndIndex - matchFirstIndex + 1);
const afterMatchBytes = oldBodyReader.readBytesToEnd();
const matchBytesReader = new BufferReader(matchBytes);
const codes = entry.codes;
let codesIndex = 0;
let startReplace = false;
newBodyBuilder.pushBytes(beforeMatchBytes);
scan.forEach(now => {
switch (now.mode) {
case 'skip':
case 'value': {
const val = matchBytesReader.readU8();
if (!startReplace) {
newBodyBuilder.pushU8(val);
}
} break;
case 'insert':
newBodyBuilder.pushBytes(codes[codesIndex++]);
break;
case 'replace_start':
newBodyBuilder.pushBytes(codes[codesIndex++]);
startReplace = true;
break;
case 'replace_end':
startReplace = false;
break;
}
});
newBodyBuilder.pushBytes(afterMatchBytes);
body = newBodyBuilder.build();
newBody = newBodyBuilder.build();
entry.onsuccess();
entry.done = true;
});
this._aobPatchFinished = alldone;
return newBody;
}
_parseCodeSection() {
const sectionLen = this._oldWasm.readVarU32();
const sectionBody = this._oldWasm.readBytes(sectionLen);
const oldSection = new BufferReader(sectionBody);
const newSection = new BufferBuilder();
const addFunctionEntries = this._addFunctionEntries;
const oldCodeCount = oldSection.readVarU32();
const newCodeCount = oldCodeCount + addFunctionEntries.length;
newSection.pushVarU32(newCodeCount);
this._aobPatchEntries.forEach(entry => {
entry.codes = this._expandCodes(entry.codes);
});
for (let i = 0; i < oldCodeCount; ++i) {
const oldFuncLen = oldSection.readVarU32();
const oldFunc = oldSection.readBytes(oldFuncLen);
const oldFuncData = new BufferReader(oldFunc);
const headerBuilder = new BufferBuilder();
const localCount = oldFuncData.readVarU32();
headerBuilder.pushVarU32(localCount);
for (let i = 0; i < localCount; ++i) {
const count = oldFuncData.readVarU32();
const varsType = oldFuncData.readU8();
headerBuilder.pushVarU32(count);
headerBuilder.pushVarU32(varsType);
}
const header = headerBuilder.build();
const oldBody = oldFuncData.readBytesToEnd();
if (this._aobPatchFinished) {
newSection.pushVarU32(oldFuncLen);
newSection.pushBytes(oldFunc);
continue;
}
const newBody = this._applyAobPatch(oldBody);
if (!newBody) {
newSection.pushVarU32(oldFuncLen);
newSection.pushBytes(oldFunc);
}
else {
const newFuncData = new BufferBuilder();
newFuncData.pushBytes(header);
newFuncData.pushBytes(newBody);
newSection.pushVarU32(newFuncData.length);
newSection.pushBytes(newFuncData.build());
}
}
for (let i = 0; i < addFunctionEntries.length; ++i) {
const entry = addFunctionEntries[i];
const headerBuilder = new BufferBuilder();
const localCount = entry.locals.length;
headerBuilder.pushVarU32(localCount);
for (let i = 0; i < localCount; ++i) {
const local = entry.locals[i];
headerBuilder.pushU32(1);
headerBuilder.pushU8(local);
}
const bodyBuilder = new BufferBuilder();
const code = this._expandCode(entry.code);
bodyBuilder.pushBytes(code);
const header = headerBuilder.build();
const body = bodyBuilder.build();
const funcData = new BufferBuilder();
funcData.pushBytes(header);
funcData.pushBytes(body);
newSection.pushVarU32(funcData.length);
newSection.pushBytes(funcData.build());
}
this._newWasm.pushVarU32(newSection.length);
this._newWasm.pushBytes(newSection.build());
}
_readSections() {
while (!this._oldWasm.finished) {
const sectionID = this._oldWasm.readU8();
this._newWasm.pushU8(sectionID);
switch (sectionID) {
case Section.Type:
this._parseTypeSection();
break;
case Section.Import:
this._parseImportSection();
break;
case Section.Function:
this._parseFunctionSection();
break;
case Section.Global:
this._parseGlobalSection();
break;
case Section.Export:
this._parseExportSection();
break;
case Section.Code:
this._parseCodeSection();
break;
default:
if (sectionID >= Section.Custom && sectionID <= Section.DataCount) {
const sectionLen = this._oldWasm.readVarU32();
const sectionBody = this._oldWasm.readBytes(sectionLen);
this._newWasm.pushVarU32(sectionLen);
this._newWasm.pushBytes(sectionBody);
}
else {
throw new Error("Invalid section");
}
break;
}
}
}
patch() {
const magic = this._oldWasm.readU32();
const version = this._oldWasm.readU32();
if (magic !== 0x6D736100) {
throw new Error("Invalid magic");
}
this._newWasm.pushU32(magic);
this._newWasm.pushU32(version);
this._readSections();
//Download(this._newWasm.build(), "a.wasm");
return this._newWasm.build();
}
_parseScanStr(scanStr) {
const scanAry = scanStr.split(' ');
let previousBracket = '';
let previousScan = '';
let totalMatches = 0;
let parsedScan = [];
const throwErr = function () {
throw new Error('Invalid entry(aobPatchEntry).scan');
};
scanAry.forEach(scan => {
switch (scan) {
case '?':
if (previousBracket === '[') {
throwErr();
}
parsedScan.push({
mode: 'skip'
});
totalMatches++;
break;
case '[':
if (previousBracket === '[') {
throwErr();
}
parsedScan.push({
mode: 'replace_start'
});
previousBracket = '[';
break;
case ']':
if (previousBracket === ']' || previousScan === '[') {
throwErr();
}
parsedScan.push({
mode: 'replace_end'
});
previousBracket = ']';
break;
case '|':
if (previousBracket === '[' || previousScan === '|') {
throwErr();
}
parsedScan.push({
mode: 'insert'
});
break;
default: {
let parsedVal = parseInt(scan, 16);
if (isNaN(parsedVal)) {
throwErr();
}
parsedScan.push({
mode: 'value',
value: parsedVal
});
totalMatches++;
} break;
}
previousScan = scan;
});
return {
scan: parsedScan,
totalMatches: totalMatches
};
}
aobPatchEntry(entry) {
const scanStr = entry.scan;
const parsed = this._parseScanStr(scanStr);
const needCodeCount = parsed.scan.filter(scanUnit => {
switch (scanUnit.mode) {
case 'insert':
case 'replace_start':
return true;
default:
return false;
}
}).length;
const entryCode = entry.code;
const entryCodes = entry.codes;
let codes;
if ((entryCode && entryCodes) ||
(!entryCode && !entryCodes)) {
throw new Error("Invalid entry.code entry.codes parameter");
}
if (needCodeCount === 0) {
throw new Error("Invalid entry.code entry.codes parameter");
}
else if (needCodeCount === 1) {
if (!entryCode) throw new Error("Invalid entry.code");
codes = [];
codes.push(entryCode);
}
else {
if (!entryCodes) throw new Error("Invalid entry.codes");
codes = entryCodes;
}
codes = codes.map(code => {
let newCode = [];
code.forEach(c => {
if (c instanceof Array) {
newCode.push(...c);
} else {
newCode.push(c);
}
});
return newCode;
});
this._aobPatchEntries.push({
name: entry.name,
scan: parsed.scan,
totalMatches: parsed.totalMatches,
codes: codes,
onsuccess: entry.onsuccess,
done: false,
});
}
addFunctionEntry(entry) {
if (!entry.params ||
!entry.return ||
!entry.code ||
!(entry.params instanceof Array) ||
!(entry.code instanceof Array)
) {
throw new Error("Invalid entry");
}
if (!entry.locals) {
entry.locals = [];
}
const locals = entry.locals;
const fixedLocals = locals.map(local => {
switch (typeof local) {
case "number": return local;
case "string": return this._string2type(local);
default: throw new Error("Invalid locals");
}
});
entry.locals = fixedLocals;
const params = entry.params;
const fixedParams = params.map(params => {
switch (typeof params) {
case "number": return params;
case "string": return this._string2type(params);
default: throw new Error("Invalid locals");
}
});
entry.params = fixedParams;
entry.return = this._string2type(entry.return);
if (entry.exportName) {
entry.exportName = this._string2bytes(entry.exportName);
}
let newCode = [];
entry.code.forEach(part => {
console.log(part)
if (part instanceof Array) {
newCode.push(...part);
}
else {
newCode.push(part);
}
})
entry.code = newCode;
const index = new WasmIndex();
entry.functionIndex = index;
this._addFunctionEntries.push(entry);
return index;
}
addGlobalVariableEntry(entry) {
/*
if (!entry.type ||
!entry.value ||
!entry.mutability
) {
throw new Error("Invalid entry");
}
*/
entry.mutability = new Number(entry.mutability); // boolean to number
entry.initializer = this._createInstantiationTimeInitializer(entry.type, entry.value);
entry.type = this._string2type(entry.type);
const index = new WasmIndex();
entry.globalIndex = index;
if (entry.exportName) {
entry.exportName = this._string2bytes(entry.exportName);
}
this._addGlobalVariableEntries.push(entry);
return index;
}
}
// EXAMPLE CODE //
/*
const wasm = WebAssembly;
wasm.instantiateStreaming = async function (source, importObject) {
let bufferSource = null;
if (source instanceof Promise) {
const response = await source;
bufferSource = await response.arrayBuffer();
}
else if (source instanceof Response) {
bufferSource = await source.arrayBuffer();
}
const patcher = new WasmPatcher(bufferSource);
patcher.aobPatchEntry({
scan: '28 2 C8 F 21 13 41 1 21 14 20 13 20 14 | 6A 21 15',
code: [
OP.drop,
OP.i32.const, VAR.s32(-3)
],
onsuccess: () => console.log("decrease value")
});
patcher.addFunction({
params: ['i32', 'i32'],
locals: ['f32'],
code: [],
return: 'i32',
export: {
name: 'magic'
}
});
patcher.addGlobalVariable
const newBufferSource = patcher.patch();
return wasm.instantiate(newBufferSource, importObject);
};
*/
