From c00ed8f4ffc4e6fca6337aecaa1acd390c71a584 Mon Sep 17 00:00:00 2001
From: Zach Hilman <zachhilman@gmail.com>
Date: Sun, 28 Apr 2019 18:42:05 -0400
Subject: [PATCH] vfs: Add function to extract ZIP file into virtual filesystem

---
 src/core/file_sys/vfs_libzip.cpp | 83 ++++++++++++++++++++++++++++++++
 src/core/file_sys/vfs_libzip.h   | 13 +++++
 2 files changed, 96 insertions(+)
 create mode 100644 src/core/file_sys/vfs_libzip.cpp
 create mode 100644 src/core/file_sys/vfs_libzip.h

diff --git a/src/core/file_sys/vfs_libzip.cpp b/src/core/file_sys/vfs_libzip.cpp
new file mode 100644
index 0000000000..64f19a0eae
--- /dev/null
+++ b/src/core/file_sys/vfs_libzip.cpp
@@ -0,0 +1,83 @@
+// Copyright 2019 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <string>
+#include <zip.h>
+#include "common/logging/backend.h"
+#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs_libzip.h"
+#include "core/file_sys/vfs_vector.h"
+
+namespace FileSys {
+
+VirtualDir ExtractZIP(VirtualFile file) {
+    zip_error_t error{};
+
+    const auto data = file->ReadAllBytes();
+    const auto src = zip_source_buffer_create(data.data(), data.size(), 0, &error);
+    if (src == nullptr)
+        return nullptr;
+
+    const auto zip = zip_open_from_source(src, 0, &error);
+    if (zip == nullptr)
+        return nullptr;
+
+    std::shared_ptr<VectorVfsDirectory> out = std::make_shared<VectorVfsDirectory>();
+
+    const auto num_entries = zip_get_num_entries(zip, 0);
+    if (num_entries == -1)
+        return nullptr;
+
+    zip_stat_t stat{};
+    zip_stat_init(&stat);
+
+    for (std::size_t i = 0; i < num_entries; ++i) {
+        const auto stat_res = zip_stat_index(zip, i, 0, &stat);
+        if (stat_res == -1)
+            return nullptr;
+
+        const std::string name(stat.name);
+        if (name.empty())
+            continue;
+
+        if (name[name.size() - 1] != '/') {
+            const auto file = zip_fopen_index(zip, i, 0);
+
+            std::vector<u8> buf(stat.size);
+            if (zip_fread(file, buf.data(), buf.size()) != buf.size())
+                return nullptr;
+
+            zip_fclose(file);
+
+            const auto parts = FileUtil::SplitPathComponents(stat.name);
+            const auto new_file = std::make_shared<VectorVfsFile>(buf, parts.back());
+
+            std::shared_ptr<VectorVfsDirectory> dtrv = out;
+            for (std::size_t j = 0; j < parts.size() - 1; ++j) {
+                if (dtrv == nullptr)
+                    return nullptr;
+                const auto subdir = dtrv->GetSubdirectory(parts[j]);
+                if (subdir == nullptr) {
+                    const auto temp = std::make_shared<VectorVfsDirectory>(
+                        std::vector<VirtualFile>{}, std::vector<VirtualDir>{}, parts[j]);
+                    dtrv->AddDirectory(temp);
+                    dtrv = temp;
+                } else {
+                    dtrv = std::dynamic_pointer_cast<VectorVfsDirectory>(subdir);
+                }
+            }
+
+            if (dtrv == nullptr)
+                return nullptr;
+            dtrv->AddFile(new_file);
+        }
+    }
+
+    zip_source_close(src);
+    zip_close(zip);
+
+    return out;
+}
+
+} // namespace FileSys
diff --git a/src/core/file_sys/vfs_libzip.h b/src/core/file_sys/vfs_libzip.h
new file mode 100644
index 0000000000..f68af576a6
--- /dev/null
+++ b/src/core/file_sys/vfs_libzip.h
@@ -0,0 +1,13 @@
+// Copyright 2019 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/file_sys/vfs_types.h"
+
+namespace FileSys {
+
+VirtualDir ExtractZIP(VirtualFile zip);
+
+} // namespace FileSys