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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.fromFile = exports.FileTokenizer = void 0;
const AbstractTokenizer_1 = require("./AbstractTokenizer");
const peek_readable_1 = require("peek-readable");
const fs = require("./FsPromise");
class FileTokenizer extends AbstractTokenizer_1.AbstractTokenizer {
constructor(fd, fileInfo) {
super(fileInfo);
this.fd = fd;
}
/**
* Read buffer from file
* @param uint8Array - Uint8Array to write result to
* @param options - Read behaviour options
* @returns Promise number of bytes read
*/
async readBuffer(uint8Array, options) {
const normOptions = this.normalizeOptions(uint8Array, options);
this.position = normOptions.position;
const res = await fs.read(this.fd, uint8Array, normOptions.offset, normOptions.length, normOptions.position);
this.position += res.bytesRead;
if (res.bytesRead < normOptions.length && (!options || !options.mayBeLess)) {
throw new peek_readable_1.EndOfStreamError();
}
return res.bytesRead;
}
/**
* Peek buffer from file
* @param uint8Array - Uint8Array (or Buffer) to write data to
* @param options - Read behaviour options
* @returns Promise number of bytes read
*/
async peekBuffer(uint8Array, options) {
const normOptions = this.normalizeOptions(uint8Array, options);
const res = await fs.read(this.fd, uint8Array, normOptions.offset, normOptions.length, normOptions.position);
if ((!normOptions.mayBeLess) && res.bytesRead < normOptions.length) {
throw new peek_readable_1.EndOfStreamError();
}
return res.bytesRead;
}
async close() {
return fs.close(this.fd);
}
}
exports.FileTokenizer = FileTokenizer;
async function fromFile(sourceFilePath) {
const stat = await fs.stat(sourceFilePath);
if (!stat.isFile) {
throw new Error(`File not a file: ${sourceFilePath}`);
}
const fd = await fs.open(sourceFilePath, 'r');
return new FileTokenizer(fd, { path: sourceFilePath, size: stat.size });
}
exports.fromFile = fromFile;