From 41e9051f2d809c42c3dfecc2eb11ad544cbd27b7 Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Mon, 19 Sep 2022 02:39:03 -0400
Subject: You break it, you fix it!

The GUI is now working again, with scanning built-in.
---
 qdeduper/filescanner.cpp | 75 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 qdeduper/filescanner.cpp

(limited to 'qdeduper/filescanner.cpp')

diff --git a/qdeduper/filescanner.cpp b/qdeduper/filescanner.cpp
new file mode 100644
index 0000000..e7e45fc
--- /dev/null
+++ b/qdeduper/filescanner.cpp
@@ -0,0 +1,75 @@
+#include "filescanner.hpp"
+
+#include <cstring>
+#include <algorithm>
+#include <fstream>
+
+using std::size_t;
+
+FileScanner::FileScanner() : QObject(nullptr), maxmnlen(0)
+{
+
+}
+
+void FileScanner::add_magic_number(const std::string &m)
+{
+    mn.push_back(m);
+    if (m.length() > maxmnlen)
+        maxmnlen = m.length();
+}
+
+void FileScanner::add_path(const fs::path &p, bool recurse)
+{
+    paths.emplace_back(p, recurse);
+}
+
+template <class T>
+void dirit_foreach(T iter, std::function<void(const fs::directory_entry& p)> f)
+{
+    std::for_each(fs::begin(iter), fs::end(iter), f);
+}
+
+void FileScanner::scan()
+{
+    size_t fcnt = 0;
+    auto opt = std::filesystem::directory_options::skip_permission_denied;
+    auto count_files = [&fcnt](const fs::directory_entry& e){
+        if (e.is_regular_file()) ++fcnt;
+    };
+    auto scan_file = [&fcnt, this](const fs::directory_entry &e) {
+        if (!e.is_regular_file()) return;
+        std::fstream fst(e.path(), std::ios::binary | std::ios::in);
+        std::string buf(maxmnlen, '\0');
+        fst.read(buf.data(), maxmnlen);
+        buf.resize(fst.gcount());
+        for (auto &magic : mn)
+            if (!memcmp(magic.data(), buf.data(), magic.length()))
+            {
+                ret.push_back(e.path());
+                break;
+            }
+        Q_EMIT file_scanned(e.path(), ++fcnt);
+    };
+    auto for_all_paths = [opt, this](std::function<void(const fs::directory_entry&)> f) {
+        for (auto &pe : paths)
+        {
+            fs::path p;
+            bool recurse;
+            std::tie(p, recurse) = pe;
+            if (recurse)
+                dirit_foreach(fs::recursive_directory_iterator(p, opt), f);
+            else
+                dirit_foreach(fs::directory_iterator(p, opt), f);
+        }
+    };
+    for_all_paths(count_files);
+    Q_EMIT scan_done_prep(fcnt);
+
+    fcnt = 0;
+    for_all_paths(scan_file);
+}
+
+std::vector<fs::path> FileScanner::file_list()
+{
+    return ret;
+}
-- 
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