bootloader/src/blfwk/SourceFile.h

/*
 * Copyright (c) 2013-14, Freescale Semiconductor, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * o Redistributions of source code must retain the above copyright notice, this list
 *   of conditions and the following disclaimer.
 *
 * o Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 *
 * o Neither the name of Freescale Semiconductor, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#if !defined(_SourceFile_h_)
#define _SourceFile_h_

#include <string>
#include <iostream>
#include <fstream>
#include "smart_ptr.h"
#include "DataSource.h"
#include "DataTarget.h"
#include "StringMatcher.h"
#include "OptionContext.h"

namespace blfwk
{
/*!
 * \brief Abstract base class for a source file containing executable code.
 *
 * The purpose of this class cluster is to provide a common interface for
 * accessing the contents of different file formats. This is accomplished
 * through several small sets of methods along with the DataSource and
 * DataTarget classes.
 *
 * The primary interface for creating instances of SourceFile is the static
 * SourceFile::openFile() function. It will create the correct subclass of
 * SourceFile by inspecting the file to determine its type.
 */
class SourceFile
{
public:
    // \brief Factory function that creates the correct subclass of SourceFile.
    static SourceFile *openFile(const std::string &path);

    //! Set of supported executable image file formats.
    enum source_file_t
    {
        kBinarySourceFile,   //!< \see blfwk::BinarySourceFile
        kELFSourceFile,      //!< \see blfwk::ELFSourceFile
        kIntelHexSourceFile, //!< \see blfwk::IntelHexSourceFile
        kSBSourceFile,       //!< \see blfwk::SBSourceFile
        kSRecordSourceFile   //!< \see blfwk::SRecordSourceFile
    };

public:
    //! \brief Default constructor.
    SourceFile(const std::string &path, source_file_t filetype);

    //! \brief Destructor.
    virtual ~SourceFile();

    //! \brief Set the option context.
    //!
    //! The source file will take ownership of the @a context and delete it
    //! when the source file is itself deleted.
    inline void setOptions(OptionContext *context) { m_options = context; }
    //! \brief Return the option context.
    inline const OptionContext *getOptions() const { return m_options; }
    //! \brief Return the file type.
    inline source_file_t getFileType() const { return m_filetype; }
    //! \brief Returns the path to the file.
    inline const std::string &getPath() const { return m_path; }
    //! \brief Get the size in bytes of the file.
    unsigned getSize() const { return m_size; }
    //! \name Opening and closing
    //@{
    //! \brief Opens the file.
    virtual void open();

    //! \brief Closes the file.
    virtual void close();

    //! \brief Returns whether the file is already open.
    virtual bool isOpen() const { return (bool)m_stream && const_cast<std::ifstream *>(m_stream.get())->is_open(); }
    //@}

    //! \name Format capabilities
    //@{
    virtual bool supportsNamedSections() const = 0;
    virtual bool supportsNamedSymbols() const = 0;
    //@}

    //! \name Data source creation
    //@{
    //! \brief Creates a data source from the entire file.
    virtual DataSource *createDataSource() = 0;

    //! \brief Creates a data source out of one or more sections of the file.
    //!
    //! The \a selector object is used to perform the section name comparison.
    //! If the file does not support named sections, or if there is not a
    //! section with the given name, this method may return NULL.
    virtual DataSource *createDataSource(StringMatcher &matcher) { return NULL; }
    //! \brief Creates a data source out of one section of the file.
    virtual DataSource *createDataSource(const std::string &section);
    //@}

    //! \name Entry point
    //@{
    //! \brief Returns true if an entry point was set in the file.
    virtual bool hasEntryPoint() = 0;

    //! \brief Returns the entry point address.
    virtual uint32_t getEntryPointAddress() { return 0; }
    //@}

    //! \name Data target creation
    //@{
    virtual DataTarget *createDataTargetForSection(const std::string &section) { return NULL; }
    virtual DataTarget *createDataTargetForSymbol(const std::string &symbol) { return NULL; }
    virtual DataTarget *createDataTargetForEntryPoint();
    //@}

    //! \name Symbols
    //@{
    //! \brief Returns whether a symbol exists in the source file.
    virtual bool hasSymbol(const std::string &name) { return false; }
    //! \brief Returns the value of a symbol.
    virtual uint32_t getSymbolValue(const std::string &name) { return 0; }
    //! \brief Returns the size of a symbol.
    virtual unsigned getSymbolSize(const std::string &name) { return 0; }
    //@}

protected:
    std::string m_path;                 //!< Path to the file.
    smart_ptr<std::ifstream> m_stream;  //!< File stream, or NULL if file is closed.
    smart_ptr<OptionContext> m_options; //!< Table of option values.
    source_file_t m_filetype;           //!< Image file type.
    unsigned m_size;                    //!< The size in bytes of the file.

    //! \brief Internal access to the input stream object.
    inline std::ifstream *getStream() { return m_stream; }
};

/*!
 * \brief Binary data file.
 */
class BinarySourceFile : public SourceFile
{
public:
    //! \brief Default constructor.
    BinarySourceFile(const std::string &path, source_file_t sourceFileType = kBinarySourceFile);

    //! \name Format capabilities
    //@{
    virtual bool supportsNamedSections() const { return false; }
    virtual bool supportsNamedSymbols() const { return false; }
    //@}

    //! \name Data source creation
    //@{
    //! \brief Creates an unmapped data source from the entire file.
    virtual DataSource *createDataSource();
    //@}

    //! \name Entry point
    //@{
    //! \brief Initialize entry point and stack pointer from assumed vetcor table
    //! at the beginning of the file.
    void guessEntryPointAndStackPointer();

    //! \brief Returns true if an entry point was set in the file.
    virtual bool hasEntryPoint() { return m_entry_point != 0xffffffff; }
    //! \brief Returns the entry point address.
    virtual uint32_t getEntryPointAddress() { return m_entry_point; }
    //! \brief Returns the stack pointer.
    uint32_t getStackPointer() { return m_stack_pointer; }
    //@}

protected:
    uint32_t m_entry_point;
    uint32_t m_stack_pointer;
};

}; // namespace blfwk

#endif // _SourceFile_h_