1 files changed, 255 insertions, 0 deletions

diff --git a/src/core/file_sys/archive_backend.h b/src/core/file_sys/archive_backend.h
new file mode 100644
index 000000000..0558698f6
--- /dev/null
+++ b/src/core/file_sys/archive_backend.h
@@ -0,0 +1,255 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+
+#include "common/common_types.h"
+#include "common/string_util.h"
+#include "common/bit_field.h"
+
+#include "core/file_sys/file.h"
+#include "core/file_sys/directory.h"
+
+#include "core/mem_map.h"
+#include "core/hle/kernel/kernel.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+// Path string type
+enum LowPathType : u32 {
+    Invalid = 0,
+    Empty   = 1,
+    Binary  = 2,
+    Char    = 3,
+    Wchar   = 4
+};
+
+union Mode {
+    u32 hex;
+    BitField<0, 1, u32> read_flag;
+    BitField<1, 1, u32> write_flag;
+    BitField<2, 1, u32> create_flag;
+};
+
+class Path {
+public:
+
+    Path():
+        type(Invalid)
+    {
+    }
+
+    Path(LowPathType type, u32 size, u32 pointer):
+        type(type)
+    {
+        switch (type) {
+            case Binary:
+            {
+                u8* data = Memory::GetPointer(pointer);
+                binary = std::vector<u8>(data, data + size);
+                break;
+            }
+            case Char:
+            {
+                const char* data = reinterpret_cast<const char*>(Memory::GetPointer(pointer));
+                string = std::string(data, size - 1); // Data is always null-terminated.
+                break;
+            }
+            case Wchar:
+            {
+                const char16_t* data = reinterpret_cast<const char16_t*>(Memory::GetPointer(pointer));
+                u16str = std::u16string(data, size/2 - 1); // Data is always null-terminated.
+                break;
+            }
+            default:
+                break;
+        }
+    }
+
+    LowPathType GetType() const {
+        return type;
+    }
+
+    /**
+     * Gets the string representation of the path for debugging
+     * @return String representation of the path for debugging
+     */
+    const std::string DebugStr() const {
+        switch (GetType()) {
+        case Invalid:
+            return "[Invalid]";
+        case Empty:
+            return "[Empty]";
+        case Binary:
+        {
+            std::stringstream res;
+            res << "[Binary: ";
+            for (unsigned byte : binary)
+                res << std::hex << std::setw(2) << std::setfill('0') << byte;
+            res << ']';
+            return res.str();
+        }
+        case Char:
+            return "[Char: " + AsString() + ']';
+        case Wchar:
+            return "[Wchar: " + AsString() + ']';
+        default:
+            // TODO(yuriks): Add assert
+            LOG_ERROR(Service_FS, "LowPathType cannot be converted to string!");
+            return {};
+        }
+    }
+
+    const std::string AsString() const {
+        switch (GetType()) {
+            case Char:
+                return string;
+            case Wchar:
+                return Common::UTF16ToUTF8(u16str);
+            case Empty:
+                return {};
+            default:
+                // TODO(yuriks): Add assert
+                LOG_ERROR(Service_FS, "LowPathType cannot be converted to string!");
+                return {};
+        }
+    }
+
+    const std::u16string AsU16Str() const {
+        switch (GetType()) {
+            case Char:
+                return Common::UTF8ToUTF16(string);
+            case Wchar:
+                return u16str;
+            case Empty:
+                return {};
+            default:
+                // TODO(yuriks): Add assert
+                LOG_ERROR(Service_FS, "LowPathType cannot be converted to u16string!");
+                return {};
+        }
+    }
+
+    const std::vector<u8> AsBinary() const {
+        switch (GetType()) {
+            case Binary:
+                return binary;
+            case Char:
+                return std::vector<u8>(string.begin(), string.end());
+            case Wchar:
+                return std::vector<u8>(u16str.begin(), u16str.end());
+            case Empty:
+                return {};
+            default:
+                // TODO(yuriks): Add assert
+                LOG_ERROR(Service_FS, "LowPathType cannot be converted to binary!");
+                return {};
+        }
+    }
+
+private:
+    LowPathType type;
+    std::vector<u8> binary;
+    std::string string;
+    std::u16string u16str;
+};
+
+class ArchiveBackend : NonCopyable {
+public:
+    virtual ~ArchiveBackend() { }
+
+    /**
+     * Get a descriptive name for the archive (e.g. "RomFS", "SaveData", etc.)
+     */
+    virtual std::string GetName() const = 0;
+
+    /**
+     * Open a file specified by its path, using the specified mode
+     * @param path Path relative to the archive
+     * @param mode Mode to open the file with
+     * @return Opened file, or nullptr
+     */
+    virtual std::unique_ptr<File> OpenFile(const Path& path, const Mode mode) const = 0;
+
+    /**
+     * Delete a file specified by its path
+     * @param path Path relative to the archive
+     * @return Whether the file could be deleted
+     */
+    virtual bool DeleteFile(const FileSys::Path& path) const = 0;
+
+    /**
+     * Rename a File specified by its path
+     * @param src_path Source path relative to the archive
+     * @param dest_path Destination path relative to the archive
+     * @return Whether rename succeeded
+     */
+    virtual bool RenameFile(const FileSys::Path& src_path, const FileSys::Path& dest_path) const = 0;
+
+    /**
+     * Delete a directory specified by its path
+     * @param path Path relative to the archive
+     * @return Whether the directory could be deleted
+     */
+    virtual bool DeleteDirectory(const FileSys::Path& path) const = 0;
+
+    /**
+     * Create a directory specified by its path
+     * @param path Path relative to the archive
+     * @return Whether the directory could be created
+     */
+    virtual bool CreateDirectory(const Path& path) const = 0;
+
+    /**
+     * Rename a Directory specified by its path
+     * @param src_path Source path relative to the archive
+     * @param dest_path Destination path relative to the archive
+     * @return Whether rename succeeded
+     */
+    virtual bool RenameDirectory(const FileSys::Path& src_path, const FileSys::Path& dest_path) const = 0;
+
+    /**
+     * Open a directory specified by its path
+     * @param path Path relative to the archive
+     * @return Opened directory, or nullptr
+     */
+    virtual std::unique_ptr<Directory> OpenDirectory(const Path& path) const = 0;
+
+    /**
+     * Read data from the archive
+     * @param offset Offset in bytes to start reading data from
+     * @param length Length in bytes of data to read from archive
+     * @param buffer Buffer to read data into
+     * @return Number of bytes read
+     */
+    virtual size_t Read(const u64 offset, const u32 length, u8* buffer) const = 0;
+
+    /**
+     * Write data to the archive
+     * @param offset Offset in bytes to start writing data to
+     * @param length Length in bytes of data to write to archive
+     * @param buffer Buffer to write data from
+     * @param flush  The flush parameters (0 == do not flush)
+     * @return Number of bytes written
+     */
+    virtual size_t Write(const u64 offset, const u32 length, const u32 flush, u8* buffer) = 0;
+
+    /**
+     * Get the size of the archive in bytes
+     * @return Size of the archive in bytes
+     */
+    virtual size_t GetSize() const = 0;
+
+    /**
+     * Set the size of the archive in bytes
+     */
+    virtual void SetSize(const u64 size) = 0;
+};
+
+} // namespace FileSys