SabreTools/SabreTools.Serialization/Hashfile.Deserializer.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using SabreTools.Core;

namespace SabreTools.Serialization
{
    /// <summary>
    /// Deserializer for hashfile variants
    /// </summary>
    public partial class Hashfile
    {
        /// <summary>
        /// Deserializes a hashfile variant to the defined type
        /// </summary>
        /// <param name="path">Path to the file to deserialize</param>
        /// <param name="hash">Hash corresponding to the hashfile variant</param>
        /// <returns>Deserialized data on success, null on failure</returns>
        public static Models.Hashfile.Hashfile? Deserialize(string path, Hash hash)
        {
            using var stream = PathProcessor.OpenStream(path);
            return Deserialize(stream, hash);
        }

        /// <summary>
        /// Deserializes a hashfile variant in a stream to the defined type
        /// </summary>
        /// <param name="stream">Stream to deserialize</param>
        /// <param name="hash">Hash corresponding to the hashfile variant</param>
        /// <returns>Deserialized data on success, null on failure</returns>
        public static Models.Hashfile.Hashfile? Deserialize(Stream? stream, Hash hash)
        {
            // If the stream is null
            if (stream == null)
                return default;

            // Setup the reader and output
            var reader = new StreamReader(stream);
            var dat = new Models.Hashfile.Hashfile();
            var additional = new List<string>();

            // Loop through the rows and parse out values
            var hashes = new List<object>();
            while (!reader.EndOfStream)
            {
                // Read and split the line
                string? line = reader.ReadLine();
                string[]? lineParts = line?.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
                if (lineParts == null)
                    continue;

                // Parse the line into a hash
                switch (hash)
                {
                    case Hash.CRC:
                        var sfv = new Models.Hashfile.SFV
                        {
                            File = string.Join(" ", lineParts[..^1]),
                            Hash = string.Join(" ", lineParts[^1]),
                        };
                        hashes.Add(sfv);
                        break;
                    case Hash.MD5:
                        var md5 = new Models.Hashfile.MD5
                        {
                            Hash = lineParts[0],
                            File = string.Join(" ", lineParts[1..]),
                        };
                        hashes.Add(md5);
                        break;
                    case Hash.SHA1:
                        var sha1 = new Models.Hashfile.SHA1
                        {
                            Hash = lineParts[0],
                            File = string.Join(" ", lineParts[1..]),
                        };
                        hashes.Add(sha1);
                        break;
                    case Hash.SHA256:
                        var sha256 = new Models.Hashfile.SHA256
                        {
                            Hash = lineParts[0],
                            File = string.Join(" ", lineParts[1..]),
                        };
                        hashes.Add(sha256);
                        break;
                    case Hash.SHA384:
                        var sha384 = new Models.Hashfile.SHA384
                        {
                            Hash = lineParts[0],
                            File = string.Join(" ", lineParts[1..]),
                        };
                        hashes.Add(sha384);
                        break;
                    case Hash.SHA512:
                        var sha512 = new Models.Hashfile.SHA512
                        {
                            Hash = lineParts[0],
                            File = string.Join(" ", lineParts[1..]),
                        };
                        hashes.Add(sha512);
                        break;
                    case Hash.SpamSum:
                        var spamSum = new Models.Hashfile.SpamSum
                        {
                            Hash = lineParts[0],
                            File = string.Join(" ", lineParts[1..]),
                        };
                        hashes.Add(spamSum);
                        break;
                }
            }

            // Assign the hashes to the hashfile and return
            switch (hash)
            {
                case Hash.CRC:
                    dat.SFV = hashes.Cast<Models.Hashfile.SFV>().ToArray();
                    break;
                case Hash.MD5:
                    dat.MD5 = hashes.Cast<Models.Hashfile.MD5>().ToArray();
                    break;
                case Hash.SHA1:
                    dat.SHA1 = hashes.Cast<Models.Hashfile.SHA1>().ToArray();
                    break;
                case Hash.SHA256:
                    dat.SHA256 = hashes.Cast<Models.Hashfile.SHA256>().ToArray();
                    break;
                case Hash.SHA384:
                    dat.SHA384 = hashes.Cast<Models.Hashfile.SHA384>().ToArray();
                    break;
                case Hash.SHA512:
                    dat.SHA512 = hashes.Cast<Models.Hashfile.SHA512>().ToArray();
                    break;
                case Hash.SpamSum:
                    dat.SpamSum = hashes.Cast<Models.Hashfile.SpamSum>().ToArray();
                    break;
            }
            dat.ADDITIONAL_ELEMENTS = additional.ToArray();
            return dat;
        }
    }
}