90 lines
2.7 KiB
C#
90 lines
2.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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using System.Windows.Forms;
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namespace FontPreview
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{
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/// <summary>
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/// 字体清单缓存：首次扫描后落盘，后续启动直接读缓存秒显，
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/// 后台再按 文件路径/大小/修改时间 做增量对比，未变化的不重新解析。
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/// </summary>
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public class FontCache
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{
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public struct Stamp
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{
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public long Size;
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public long Mtime;
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}
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public string RootDir;
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public List<FontItem> Items = new List<FontItem>();
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public Dictionary<string, Stamp> Stamps = new Dictionary<string, Stamp>(StringComparer.OrdinalIgnoreCase);
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private static string CachePath => Path.Combine(Path.GetDirectoryName(Application.ExecutablePath), "fontcache.txt");
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public static bool TryLoad(string rootDir, out FontCache cache)
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{
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cache = null;
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try
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{
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if (!File.Exists(CachePath)) return false;
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string[] lines = File.ReadAllLines(CachePath, Encoding.UTF8);
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if (lines.Length < 2 || lines[0] != "#FontCache v1") return false;
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string rd = null;
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for (int i = 0; i < lines.Length; i++)
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{
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if (lines[i].StartsWith("rootdir=")) { rd = lines[i].Substring(8).Trim(); break; }
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}
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if (rd == null || !string.Equals(rd, rootDir.Trim(), StringComparison.OrdinalIgnoreCase)) return false;
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FontCache c = new FontCache();
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c.RootDir = rootDir;
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for (int i = 0; i < lines.Length; i++)
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{
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string l = lines[i];
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if (string.IsNullOrEmpty(l) || l[0] == '#' || l.StartsWith("rootdir=")) continue;
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string[] p = l.Split('\t');
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if (p.Length < 6) continue;
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FontItem it = new FontItem { Cat = p[0], Path = p[1], Name = p[2], DisplayName = p[3] };
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c.Items.Add(it);
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long size, mt;
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if (long.TryParse(p[4], out size) && long.TryParse(p[5], out mt))
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{
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c.Stamps[it.Path] = new Stamp { Size = size, Mtime = mt };
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}
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}
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if (c.Items.Count == 0) return false;
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cache = c;
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return true;
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}
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catch { return false; }
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}
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public static void Save(FontCache c)
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{
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try
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{
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StringBuilder sb = new StringBuilder();
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sb.AppendLine("#FontCache v1");
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sb.AppendLine("rootdir=" + c.RootDir);
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foreach (FontItem it in c.Items)
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{
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Stamp st;
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c.Stamps.TryGetValue(it.Path, out st);
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string dn = (it.DisplayName ?? "").Replace("\t", " ");
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sb.Append(it.Cat).Append('\t').Append(it.Path).Append('\t')
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.Append(it.Name).Append('\t').Append(dn).Append('\t')
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.Append(st.Size).Append('\t').Append(st.Mtime).Append('\n');
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}
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string tmp = CachePath + ".tmp";
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File.WriteAllText(tmp, sb.ToString(), new UTF8Encoding(false));
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if (File.Exists(CachePath)) { File.Copy(tmp, CachePath, true); File.Delete(tmp); }
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else { File.Move(tmp, CachePath); }
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}
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catch { }
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}
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}
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}
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