dolphin-tool/dist/src/dolphin-tool/dolphinToolHeader.js

🐬 dolphin-tool binaries and wrapper for Node.js.

import fs from 'node:fs';
import util from 'node:util';
import DolphinToolBin from './dolphinToolBin.js';
import { CompressionMethodGcz, CompressionMethodWiaRvz } from './common.js';
/**
 * Parses information found in file headers.
 */
export default {
    /**
     * Have `dolphin-tool` parse the file header.
     */
    async header(options, attempt = 1) {
        const output = await DolphinToolBin.run([
            'header',
            '-i', options.inputFilename,
            '-j',
            '-b',
            '-c',
            '-l',
        ], options);
        // Try to detect failures, and then retry them automatically
        if (!output.trim() && attempt <= 3) {
            await new Promise((resolve) => {
                setTimeout(resolve, Math.random() * (2 ** (attempt - 1) * 20));
            });
            return this.header(options, attempt + 1);
        }
        const object = JSON.parse(output);
        let compressionMethod = CompressionMethodWiaRvz.NONE;
        if (typeof object.compression_method === 'string') {
            if (object.compression_method.toLowerCase() === 'none') {
                compressionMethod = CompressionMethodWiaRvz.NONE;
            }
            else if (object.compression_method.toLowerCase() === 'zstd'
                || object.compression_method.toLowerCase() === 'zstandard') {
                compressionMethod = CompressionMethodWiaRvz.ZSTD;
            }
            else if (object.compression_method.toLowerCase() === 'deflate') {
                compressionMethod = CompressionMethodGcz.DEFLATE;
            }
            else if (object.compression_method.toLowerCase() === 'bzip2') {
                compressionMethod = CompressionMethodWiaRvz.BZIP2;
            }
            else if (object.compression_method.toLowerCase() === 'lzma') {
                compressionMethod = CompressionMethodWiaRvz.LZMA;
            }
            else if (object.compression_method.toLowerCase() === 'lzma2') {
                compressionMethod = CompressionMethodWiaRvz.LZMA2;
            }
        }
        return {
            blockSize: object.block_size,
            compressionLevel: object.compression_level,
            compressionMethod,
            country: object.country,
            gameId: object.game_id,
            internalName: object.internal_name,
            region: object.region,
            revision: object.revision,
        };
    },
    /**
     * Read the file header
     */
    async uncompressedSize(inputFilename) {
        // WIA, RVZ?
        const chunks = [];
        for await (const chunk of fs.createReadStream(inputFilename, { start: 0, end: 0x24 + 8 })) {
            chunks.push(chunk);
        }
        const contents = Buffer.concat(chunks);
        if (contents.subarray(0, 4).equals(Buffer.from('01C00BB1', 'hex'))) {
            // GCZ
            // @see https://github.com/dolphin-emu/dolphin/blob/1f5e100a0e6dd4f9ab3784fd6373d452054d08bf/Source/Core/DiscIO/CompressedBlob.h#L38
            return contents.subarray(0x10, 0x10 + 8).readBigUInt64LE();
        }
        if (contents.subarray(0, 4).equals(Buffer.from('RVZ\u0001'))) {
            // RVZ
            // @see https://github.com/dolphin-emu/dolphin/blob/f93781d91a90a937973534298b67b789f6a0db0a/docs/WiaAndRvz.md#wia_file_head_t
            return contents.subarray(0x24, 0x24 + 8).readBigUInt64BE();
        }
        if (contents.subarray(0, 4).equals(Buffer.from('WIA\u0001'))) {
            // WIA
            // @see https://github.com/dolphin-emu/dolphin/blob/f93781d91a90a937973534298b67b789f6a0db0a/docs/WiaAndRvz.md#wia_file_head_t
            return contents.subarray(0x24, 0x24 + 8).readBigUInt64BE();
        }
        // ISO
        const stat = await util.promisify(fs.stat)(inputFilename);
        return BigInt(stat.size);
    },
};
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