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using System.Collections.Generic;

using System.IO;

using System.Xml;

namespace ScribdMpubToEpubConverter

{

public static class DecryptionKeyListParser

{

public static void Parse(string file_path, ref Dictionary<string, string> DecryptionKeys)

{

using var reader = XmlReader.Create(File.OpenRead(file_path));

while (reader.Read())

{

if (reader.NodeType != XmlNodeType.Element)

continue;

if (reader.Name != "string")

continue;

// Make sure to filter out the IS_MIGRATED option

var name = reader.GetAttribute("name");

if (!name.StartsWith("KEY_"))

{

Helper.Information("Skipping XML entry, as it is not a key: " + name);

continue;

}

// Try to read the value

if (!reader.Read())

continue;

if (reader.NodeType != XmlNodeType.Text)

continue;

// Sanity check, as the key length should be 32 bytes.

var value = reader.Value.Trim();

if (value.Length != 32)

{

Helper.Warning("Skipping decryption key with incorrect value length: " + name);

continue;

}

DecryptionKeys.Add(name.Remove(0, "KEY_".Length), value);

}

Helper.Debug("Decryption key entries: " + DecryptionKeys.Count);

}

}

}