Kernel: Add a File object and a getter for it from an Archive object.

src/core/hle/kernel/archive.cpp

@@ -3,9 +3,11 @@
 // Refer to the license.txt file included.
 
 #include "common/common_types.h"
+#include "common/file_util.h"
 #include "common/math_util.h"
 
 #include "core/file_sys/archive.h"
+#include "core/file_sys/archive_sdmc.h"
 #include "core/hle/service/service.h"
 #include "core/hle/kernel/archive.h"
 
@@ -108,6 +110,83 @@ public:
     }
 };
 
+class File : public Object {
+public:
+    std::string GetTypeName() const { return "File"; }
+    std::string GetName() const { return path; }
+
+    static Kernel::HandleType GetStaticHandleType() { return HandleType::File; }
+    Kernel::HandleType GetHandleType() const { return HandleType::File; }
+
+    std::string path; ///< Path of the file
+    std::unique_ptr<FileSys::File> backend; ///< File backend interface
+
+    /**
+     * Synchronize kernel object
+     * @param wait Boolean wait set if current thread should wait as a result of sync operation
+     * @return Result of operation, 0 on success, otherwise error code
+     */
+    Result SyncRequest(bool* wait) {
+        u32* cmd_buff = Service::GetCommandBuffer();
+        FileCommand cmd = static_cast<FileCommand>(cmd_buff[0]);
+        switch (cmd) {
+
+        // Read from file...
+        case FileCommand::Read:
+        {
+            u64 offset = cmd_buff[1] | ((u64) cmd_buff[2]) << 32;
+            u32 length  = cmd_buff[3];
+            u32 address = cmd_buff[5];
+            DEBUG_LOG(KERNEL, "Read %s %s: offset=0x%x length=%d address=0x%x",
+                      GetTypeName().c_str(), GetName().c_str(), offset, length, address);
+            cmd_buff[2] = backend->Read(offset, length, Memory::GetPointer(address));
+            break;
+        }
+
+        // Write to file...
+        case FileCommand::Write:
+        {
+            u64 offset  = cmd_buff[1] | ((u64) cmd_buff[2]) << 32;
+            u32 length  = cmd_buff[3];
+            u32 flush   = cmd_buff[4];
+            u32 address = cmd_buff[6];
+            DEBUG_LOG(KERNEL, "Write %s %s: offset=0x%x length=%d address=0x%x, flush=0x%x",
+                      GetTypeName().c_str(), GetName().c_str(), offset, length, address, flush);
+            cmd_buff[2] = backend->Write(offset, length, flush, Memory::GetPointer(address));
+            break;
+        }
+
+        case FileCommand::GetSize:
+        {
+            DEBUG_LOG(KERNEL, "GetSize %s %s", GetTypeName().c_str(), GetName().c_str());
+            u64 size = backend->GetSize();
+            cmd_buff[2] = (u32)size;
+            cmd_buff[3] = size >> 32;
+            break;
+        }
+
+        // Unknown command...
+        default:
+            ERROR_LOG(KERNEL, "Unknown command=0x%08X!", cmd);
+            cmd_buff[1] = -1; // TODO(Link Mauve): use the correct error code for that.
+            return -1;
+        }
+        cmd_buff[1] = 0; // No error
+        return 0;
+    }
+
+    /**
+     * Wait for kernel object to synchronize
+     * @param wait Boolean wait set if current thread should wait as a result of sync operation
+     * @return Result of operation, 0 on success, otherwise error code
+     */
+    Result WaitSynchronization(bool* wait) {
+        // TODO(bunnei): ImplementMe
+        ERROR_LOG(OSHLE, "(UNIMPLEMENTED)");
+        return 0;
+    }
+};
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 std::map<FileSys::Archive::IdCode, Handle> g_archive_map; ///< Map of file archives by IdCode
@@ -171,9 +250,39 @@ Handle CreateArchive(FileSys::Archive* backend, const std::string& name) {
     return handle;
 }
 
+/**
+ * Open a File from an Archive
+ * @param archive_handle Handle to an open Archive object
+ * @param path Path to the File inside of the Archive
+ * @param mode Mode under which to open the File
+ * @return Opened File object
+ */
+Handle OpenFileFromArchive(Handle archive_handle, const std::string& path, const FileSys::Mode mode) {
+    File* file = new File;
+    Handle handle = Kernel::g_object_pool.Create(file);
+
+    Archive* archive = Kernel::g_object_pool.GetFast<Archive>(archive_handle);
+    file->path = path;
+    file->backend = archive->backend->OpenFile(path, mode);
+
+    return handle;
+}
+
 /// Initialize archives
 void ArchiveInit() {
     g_archive_map.clear();
+
+    // TODO(Link Mauve): Add the other archive types (see here for the known types:
+    // http://3dbrew.org/wiki/FS:OpenArchive#Archive_idcodes).  Currently the only half-finished
+    // archive type is SDMC, so it is the only one getting exposed.
+
+    // TODO(Link Mauve): don't assume the path separator is '/'.
+    std::string sdmc_directory = FileUtil::GetCurrentDir() + "/userdata/sdmc";
+    auto archive = new FileSys::Archive_SDMC(sdmc_directory);
+    if (archive->Initialize())
+        CreateArchive(archive, "SDMC");
+    else
+        ERROR_LOG(KERNEL, "Can't instantiate SDMC archive with path %s", sdmc_directory.c_str());
 }
 
 /// Shutdown archives

src/core/hle/kernel/archive.h

@@ -29,6 +29,15 @@ Handle OpenArchive(FileSys::Archive::IdCode id_code);
  */
 Handle CreateArchive(FileSys::Archive* backend, const std::string& name);
 
+/**
+ * Open a File from an Archive
+ * @param archive_handle Handle to an open Archive object
+ * @param path Path to the File inside of the Archive
+ * @param mode Mode under which to open the File
+ * @return Opened File object
+ */
+Handle OpenFileFromArchive(Handle handle, const std::string& name, const FileSys::Mode mode);
+
 /// Initialize archives
 void ArchiveInit();