jp2-to-image/build/JPEG2000NodeConverter.js

A library for converting JPEG 2000 (JP2) images to another format

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
            return ar;
        };
        return ownKeys(o);
    };
    return function (mod) {
        if (mod && mod.__esModule) return mod;
        var result = {};
        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
        __setModuleDefault(result, mod);
        return result;
    };
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.JPEG2000NodeConverter = void 0;
const child_process_1 = require("child_process");
const fs = __importStar(require("fs-extra"));
const path = __importStar(require("path"));
class JPEG2000NodeConverter {
    constructor() {
        const platform = process.platform;
        let binFileName = 'convert'; // base path
        if (platform === 'win32')
            binFileName = 'convert-win.exe';
        else if (platform === 'darwin')
            binFileName = 'convert-mac';
        else if (platform === 'linux')
            binFileName = 'convert-linux';
        else
            throw new Error(`Unsupported platform: ${platform}`);
        this.binPath = path.resolve(__dirname, 'bin', binFileName);
        if (platform !== 'win32') {
            fs.ensureFileSync(this.binPath);
            fs.chmodSync(this.binPath, 0o755);
        }
    }
    /**
     * Handles the conversion process
     * @param inputBuffer The input image buffer
     * @param format Target format
     * @returns Converted image as a buffer
     */
    async convertImage(inputBuffer, format = 'png') {
        try {
            const convertedBuffer = await this._executeJar(inputBuffer, format);
            return convertedBuffer;
        }
        catch (error) {
            console.error(`Error converting to ${format}:`, error);
            throw error;
        }
    }
    /**
     * Executes the conversion binary, sending the image via stdin and receiving the result via stdout.
     *
     * @param inputBuffer The input image as a Buffer
     * @param format The desired output format (e.g., "jpg", "png", "jp2")
     * @returns The converted image as a Buffer
     */
    _executeJar(inputBuffer, format) {
        return new Promise((resolve, reject) => {
            const process = (0, child_process_1.spawn)(this.binPath, [format]);
            const outputBuffer = [];
            let errorOutput = '';
            // Capture stdout as Buffer
            process.stdout.on('data', data => outputBuffer.push(data));
            // Capture stderr
            process.stderr.on('data', data => (errorOutput += data.toString()));
            process.on('close', code => {
                if (code !== 0) {
                    reject(new Error(`Process failed with code ${code}: ${errorOutput}`));
                }
                else {
                    resolve(Buffer.concat(outputBuffer)); // Combine all received chunks
                }
            });
            // Write image buffer to process and close stdin
            process.stdin.write(inputBuffer);
            process.stdin.end();
        });
    }
}
exports.JPEG2000NodeConverter = JPEG2000NodeConverter;
//# sourceMappingURL=JPEG2000NodeConverter.js.map