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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_SHARED_IMPL_PPB_FILE_IO_SHARED_H_
#define PPAPI_SHARED_IMPL_PPB_FILE_IO_SHARED_H_
#include <deque>
#include "base/compiler_specific.h"
#include "ppapi/shared_impl/ppapi_shared_export.h"
#include "ppapi/shared_impl/resource.h"
#include "ppapi/shared_impl/tracked_callback.h"
#include "ppapi/thunk/ppb_file_io_api.h"
namespace ppapi {
namespace thunk {
class PPB_FileRef_API;
}
class PPAPI_SHARED_EXPORT PPB_FileIO_Shared : public Resource,
public thunk::PPB_FileIO_API {
public:
PPB_FileIO_Shared(PP_Instance instance);
PPB_FileIO_Shared(const HostResource& host_resource);
~PPB_FileIO_Shared();
// Resource overrides.
virtual thunk::PPB_FileIO_API* AsPPB_FileIO_API() OVERRIDE;
// PPB_FileIO_API implementation.
virtual int32_t Open(PP_Resource file_ref,
int32_t open_flags,
PP_CompletionCallback callback) OVERRIDE;
virtual int32_t Query(PP_FileInfo* info,
PP_CompletionCallback callback) OVERRIDE;
virtual int32_t Touch(PP_Time last_access_time,
PP_Time last_modified_time,
PP_CompletionCallback callback) OVERRIDE;
virtual int32_t Read(int64_t offset,
char* buffer,
int32_t bytes_to_read,
PP_CompletionCallback callback) OVERRIDE;
virtual int32_t Write(int64_t offset,
const char* buffer,
int32_t bytes_to_write,
PP_CompletionCallback callback) OVERRIDE;
virtual int32_t SetLength(int64_t length,
PP_CompletionCallback callback) OVERRIDE;
virtual int32_t Flush(PP_CompletionCallback callback) OVERRIDE;
// Callback handler for different types of operations.
void ExecuteGeneralCallback(int32_t pp_error);
void ExecuteOpenFileCallback(int32_t pp_error);
void ExecuteQueryCallback(int32_t pp_error, const PP_FileInfo& info);
void ExecuteReadCallback(int32_t pp_error, const char* data);
protected:
struct CallbackEntry {
CallbackEntry();
CallbackEntry(const CallbackEntry& entry);
~CallbackEntry();
scoped_refptr<TrackedCallback> callback;
// Pointer back to the caller's read buffer; only used by |Read()|, NULL
// for non-read operations. Not owned.
char* read_buffer;
// Pointer back to the caller's PP_FileInfo structure for Query operations.
// NULL for non-query operations. Not owned.
PP_FileInfo* info;
};
enum OperationType {
// There is no pending operation right now.
OPERATION_NONE,
// If there are pending reads, any other kind of async operation is not
// allowed.
OPERATION_READ,
// If there are pending writes, any other kind of async operation is not
// allowed.
OPERATION_WRITE,
// If there is a pending operation that is neither read nor write, no
// further async operation is allowed.
OPERATION_EXCLUSIVE
};
// Validated versions of the FileIO API. Subclasses in the proxy and impl
// implement these so the common error checking stays here.
virtual int32_t OpenValidated(PP_Resource file_ref_resource,
thunk::PPB_FileRef_API* file_ref_api,
int32_t open_flags,
PP_CompletionCallback callback) = 0;
virtual int32_t QueryValidated(PP_FileInfo* info,
PP_CompletionCallback callback) = 0;
virtual int32_t TouchValidated(PP_Time last_access_time,
PP_Time last_modified_time,
PP_CompletionCallback callback) = 0;
virtual int32_t ReadValidated(int64_t offset,
char* buffer,
int32_t bytes_to_read,
PP_CompletionCallback callback) = 0;
virtual int32_t WriteValidated(int64_t offset,
const char* buffer,
int32_t bytes_to_write,
PP_CompletionCallback callback) = 0;
virtual int32_t SetLengthValidated(int64_t length,
PP_CompletionCallback callback) = 0;
virtual int32_t FlushValidated(PP_CompletionCallback callback) = 0;
// Called for every "Validated" function.
//
// This verifies that the callback is valid and that no callback is already
// pending, or it is a read(write) request and currently the pending
// operations are reads(writes).
//
// Returns |PP_OK| to indicate that everything is valid or |PP_ERROR_...| if
// the call should be aborted and that code returned to the plugin.
int32_t CommonCallValidation(bool should_be_open,
OperationType new_op,
PP_CompletionCallback callback);
// Sets up a pending callback. This should only be called once it is certain
// that |PP_OK_COMPLETIONPENDING| will be returned.
//
// |read_buffer| is only used by read operations, |info| is used only by
// query operations.
void RegisterCallback(OperationType op,
PP_CompletionCallback callback,
char* read_buffer,
PP_FileInfo* info);
// Pops the oldest callback from the queue and runs it.
void RunAndRemoveFirstPendingCallback(int32_t result);
// The file system type specified in the Open() call. This will be
// PP_FILESYSTEMTYPE_INVALID before open was called. This value does not
// indicate that the open command actually succeeded.
PP_FileSystemType file_system_type_;
// Set to true when the file has been successfully opened.
bool file_open_;
std::deque<CallbackEntry> callbacks_;
OperationType pending_op_;
DISALLOW_COPY_AND_ASSIGN(PPB_FileIO_Shared);
};
} // namespace ppapi
#endif // PPAPI_SHARED_IMPL_PPB_FILE_IO_SHARED_H_
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