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author | Greg Hysen <greg.hysen@gmail.com> | 2018-11-21 05:24:45 +0800 |
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committer | Greg Hysen <greg.hysen@gmail.com> | 2018-11-29 08:38:11 +0800 |
commit | aed8b083b587e7b420ac6129b04004dea95c3f3a (patch) | |
tree | f6eacabc4061d6f616b85886a5f02d3149e16537 /packages/utils/src/abi_encoder/calldata/raw_calldata.ts | |
parent | e6ab6f38bacdec90c960ff1db4781d161b1f4103 (diff) | |
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Split Calldata into multiple files - 1 class per file
Diffstat (limited to 'packages/utils/src/abi_encoder/calldata/raw_calldata.ts')
-rw-r--r-- | packages/utils/src/abi_encoder/calldata/raw_calldata.ts | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/packages/utils/src/abi_encoder/calldata/raw_calldata.ts b/packages/utils/src/abi_encoder/calldata/raw_calldata.ts new file mode 100644 index 000000000..8b946ee4b --- /dev/null +++ b/packages/utils/src/abi_encoder/calldata/raw_calldata.ts @@ -0,0 +1,82 @@ +import * as ethUtil from 'ethereumjs-util'; + +import * as Constants from '../constants'; +import { Queue } from '../utils/queue'; + +export class RawCalldata { + private static readonly _INITIAL_OFFSET = 0; + private readonly _value: Buffer; + private readonly _selector: string; + private readonly _scopes: Queue<number>; + private _offset: number; // tracks current offset into raw calldata; used for parsing + + constructor(value: string | Buffer, hasSelectorPrefix: boolean = true) { + if (typeof value === 'string' && !value.startsWith('0x')) { + throw new Error(`Expected raw calldata to start with '0x'`); + } + const valueBuf = ethUtil.toBuffer(value); + if (hasSelectorPrefix) { + this._selector = ethUtil.bufferToHex( + valueBuf.slice(Constants.HEX_SELECTOR_BYTE_OFFSET_IN_CALLDATA, Constants.HEX_SELECTOR_LENGTH_IN_BYTES), + ); + this._value = valueBuf.slice(Constants.HEX_SELECTOR_LENGTH_IN_BYTES); // disregard selector + } else { + this._selector = '0x'; + this._value = valueBuf; + } + + this._scopes = new Queue<number>(); + this._scopes.push(RawCalldata._INITIAL_OFFSET); + this._offset = RawCalldata._INITIAL_OFFSET; + } + + public popBytes(lengthInBytes: number): Buffer { + const value = this._value.slice(this._offset, this._offset + lengthInBytes); + this.setOffset(this._offset + lengthInBytes); + return value; + } + + public popWord(): Buffer { + const wordInBytes = 32; + return this.popBytes(wordInBytes); + } + + public popWords(length: number): Buffer { + const wordInBytes = 32; + return this.popBytes(length * wordInBytes); + } + + public readBytes(from: number, to: number): Buffer { + const value = this._value.slice(from, to); + return value; + } + + public setOffset(offsetInBytes: number): void { + this._offset = offsetInBytes; + } + + public startScope(): void { + this._scopes.pushFront(this._offset); + } + + public endScope(): void { + this._scopes.pop(); + } + + public getOffset(): number { + return this._offset; + } + + public toAbsoluteOffset(relativeOffset: number): number { + const scopeOffset = this._scopes.peek(); + if (scopeOffset === undefined) { + throw new Error(`Tried to access undefined scope.`); + } + const absoluteOffset = relativeOffset + scopeOffset; + return absoluteOffset; + } + + public getSelector(): string { + return this._selector; + } +}
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