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diff --git a/deps/libchdr/deps/zstd-1.5.5/contrib/gen_html/gen_html.cpp b/deps/libchdr/deps/zstd-1.5.5/contrib/gen_html/gen_html.cpp
new file mode 100644
index 00000000..1da5879a
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/contrib/gen_html/gen_html.cpp
@@ -0,0 +1,224 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ */
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <vector>
+using namespace std;
+
+
+/* trim string at the beginning and at the end */
+void trim(string& s, string characters)
+{
+    size_t p = s.find_first_not_of(characters);
+    s.erase(0, p);
+
+    p = s.find_last_not_of(characters);
+    if (string::npos != p)
+       s.erase(p+1);
+}
+
+
+/* trim C++ style comments */
+void trim_comments(string &s)
+{
+    size_t spos, epos;
+
+    spos = s.find("/*");
+    epos = s.find("*/");
+    s = s.substr(spos+3, epos-(spos+3));
+}
+
+
+/* get lines until a given terminator */
+vector<string> get_lines(vector<string>& input, int& linenum, string terminator)
+{
+    vector<string> out;
+    string line;
+    size_t epos;
+
+    while ((size_t)linenum < input.size()) {
+        line = input[linenum];
+
+        if (terminator.empty() && line.empty()) { linenum--; break; }
+
+        epos = line.find(terminator);
+        if (!terminator.empty() && epos!=string::npos) {
+            out.push_back(line);
+            break;
+        }
+        out.push_back(line);
+        linenum++;
+    }
+    return out;
+}
+
+
+/* print line with ZSTDLIB_API removed and C++ comments not bold */
+void print_line(stringstream &sout, string line)
+{
+    size_t spos;
+
+    if (line.substr(0,12) == "ZSTDLIB_API ") line = line.substr(12);
+    spos = line.find("/*");
+    if (spos!=string::npos) {
+        sout << line.substr(0, spos);
+        sout << "</b>" << line.substr(spos) << "<b>" << endl;
+    } else {
+      //  fprintf(stderr, "lines=%s\n", line.c_str());
+        sout << line << endl;
+    }
+}
+
+
+int main(int argc, char *argv[]) {
+    char exclam;
+    int linenum, chapter = 1;
+    vector<string> input, lines, comments, chapters;
+    string line, version;
+    size_t spos, l;
+    stringstream sout;
+    ifstream istream;
+    ofstream ostream;
+
+    if (argc < 4) {
+        cout << "usage: " << argv[0] << " [zstd_version] [input_file] [output_html]" << endl;
+        return 1;
+    }
+
+    version = "zstd " + string(argv[1]) + " Manual";
+
+    istream.open(argv[2], ifstream::in);
+    if (!istream.is_open()) {
+        cout << "Error opening file " << argv[2] << endl;
+        return 1;
+    }
+
+    ostream.open(argv[3], ifstream::out);
+    if (!ostream.is_open()) {
+        cout << "Error opening file " << argv[3] << endl;
+        return 1;
+   }
+
+    while (getline(istream, line)) {
+        input.push_back(line);
+    }
+
+    for (linenum=0; (size_t)linenum < input.size(); linenum++) {
+        line = input[linenum];
+
+        /* typedefs are detected and included even if uncommented */
+        if (line.substr(0,7) == "typedef" && line.find("{")!=string::npos) {
+            lines = get_lines(input, linenum, "}");
+            sout << "<pre><b>";
+            for (l=0; l<lines.size(); l++) {
+                print_line(sout, lines[l]);
+            }
+            sout << "</b></pre><BR>" << endl;
+            continue;
+        }
+
+        /* comments of type /**< and /*!< are detected and only function declaration is highlighted (bold) */
+        if ((line.find("/**<")!=string::npos || line.find("/*!<")!=string::npos) && line.find("*/")!=string::npos) {
+            sout << "<pre><b>";
+            print_line(sout, line);
+            sout << "</b></pre><BR>" << endl;
+            continue;
+        }
+
+        spos = line.find("/**=");
+        if (spos==string::npos) {
+            spos = line.find("/*!");
+            if (spos==string::npos)
+                spos = line.find("/**");
+            if (spos==string::npos)
+                spos = line.find("/*-");
+            if (spos==string::npos)
+                spos = line.find("/*=");
+            if (spos==string::npos)
+                continue;
+            exclam = line[spos+2];
+        }
+        else exclam = '=';
+
+        comments = get_lines(input, linenum, "*/");
+        if (!comments.empty()) comments[0] = line.substr(spos+3);
+        if (!comments.empty()) comments[comments.size()-1] = comments[comments.size()-1].substr(0, comments[comments.size()-1].find("*/"));
+        for (l=0; l<comments.size(); l++) {
+            if (comments[l].find(" *")==0) comments[l] = comments[l].substr(2);
+            else if (comments[l].find("  *")==0) comments[l] = comments[l].substr(3);
+            trim(comments[l], "*-=");
+        }
+        while (!comments.empty() && comments[comments.size()-1].empty()) comments.pop_back(); // remove empty line at the end
+        while (!comments.empty() && comments[0].empty()) comments.erase(comments.begin()); // remove empty line at the start
+
+        /* comments of type /*! mean: this is a function declaration; switch comments with declarations */
+        if (exclam == '!') {
+            if (!comments.empty()) comments.erase(comments.begin()); /* remove first line like "ZSTD_XXX() :" */
+            linenum++;
+            lines = get_lines(input, linenum, "");
+
+            sout << "<pre><b>";
+            for (l=0; l<lines.size(); l++) {
+              //  fprintf(stderr, "line[%d]=%s\n", l, lines[l].c_str());
+                string fline = lines[l];
+                if (fline.substr(0, 12) == "ZSTDLIB_API " ||
+                    fline.substr(0, 12) == string(12, ' '))
+                  fline = fline.substr(12);
+                print_line(sout, fline);
+            }
+            sout << "</b><p>";
+            for (l=0; l<comments.size(); l++) {
+                print_line(sout, comments[l]);
+            }
+            sout << "</p></pre><BR>" << endl << endl;
+        } else if (exclam == '=') { /* comments of type /*= and /**= mean: use a <H3> header and show also all functions until first empty line */
+            trim(comments[0], " ");
+            sout << "<h3>" << comments[0] << "</h3><pre>";
+            for (l=1; l<comments.size(); l++) {
+                print_line(sout, comments[l]);
+            }
+            sout << "</pre><b><pre>";
+            lines = get_lines(input, ++linenum, "");
+            for (l=0; l<lines.size(); l++) {
+                print_line(sout, lines[l]);
+            }
+            sout << "</pre></b><BR>" << endl;
+        } else { /* comments of type /** and /*- mean: this is a comment; use a <H2> header for the first line */
+            if (comments.empty()) continue;
+
+            trim(comments[0], " ");
+            sout << "<a name=\"Chapter" << chapter << "\"></a><h2>" << comments[0] << "</h2><pre>";
+            chapters.push_back(comments[0]);
+            chapter++;
+
+            for (l=1; l<comments.size(); l++) {
+                print_line(sout, comments[l]);
+            }
+            if (comments.size() > 1)
+                sout << "<BR></pre>" << endl << endl;
+            else
+                sout << "</pre>" << endl << endl;
+        }
+    }
+
+    ostream << "<html>\n<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\">\n<title>" << version << "</title>\n</head>\n<body>" << endl;
+    ostream << "<h1>" << version << "</h1>\n";
+
+    ostream << "<hr>\n<a name=\"Contents\"></a><h2>Contents</h2>\n<ol>\n";
+    for (size_t i=0; i<chapters.size(); i++)
+        ostream << "<li><a href=\"#Chapter" << i+1 << "\">" << chapters[i].c_str() << "</a></li>\n";
+    ostream << "</ol>\n<hr>\n";
+
+    ostream << sout.str();
+    ostream << "</html>" << endl << "</body>" << endl;
+
+    return 0;
+}