torc/bitstream/Bitstream.hpp

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// Torc - Copyright 2011 University of Southern California.  All Rights Reserved.
// $HeadURL: https://torc-isi.svn.sourceforge.net/svnroot/torc-isi/branches/staging/0.9/src/torc/bitstream/Bitstream.hpp $
// $Id: Bitstream.hpp 10 2011-10-12 18:40:16Z nsteiner $

// This program is free software: you can redistribute it and/or modify it under the terms of the 
// GNU General Public License as published by the Free Software Foundation, either version 3 of the 
// License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 
// the GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License along with this program.  If 
// not, see <http://www.gnu.org/licenses/>.

/// \file
/// \brief Header for the Bitstream class.

#ifndef TORC_BITSTREAM_BITSTREAM_HPP
#define TORC_BITSTREAM_BITSTREAM_HPP

#include "torc/common/Endian.hpp"
#include "torc/bitstream/DeviceInfo.hpp"
#include "torc/common/Devices.hpp"
#include "torc/common/EncapsulatedInteger.hpp"
#include <istream>
#include <ostream>
#include <string>
#include <map>

/// \todo remove <iostream>
#include <iostream>

namespace torc {
namespace bitstream {

namespace bitstream { class BitstreamUnitTest; }

    /// \brief Xilinx bitstream base class.
    class Bitstream {
        friend class torc::bitstream::bitstream::BitstreamUnitTest;
/// \todo Bitstream access needs to be changed from public back to protected.
//  protected: changed to run tests
        public:
        typedef std::string string; ///< Imported type name.
        typedef boost::uint8_t uint8_t; ///< Imported type name.
        typedef boost::uint16_t uint16_t; ///< Imported type name.
        typedef boost::uint32_t uint32_t; ///< Imported type name.
        typedef torc::common::EDevice EDevice; ///< Imported type name.

        /// \brief Write a uint8_t to the stream.
        void write(std::ostream& inStream, uint8_t inVal) {
            uint8_t actual = inVal;
            inStream.write((char*) &actual, sizeof(actual));
        }
        /// \brief Write a uint16_t to the stream.
        void write(std::ostream& inStream, uint16_t inVal) {
            uint16_t actual = htons(inVal);
            inStream.write((char*) &actual, sizeof(actual));
        }
        /// \brief Write a uint32_t to the stream.
        void write(std::ostream& inStream, uint32_t inVal) {
            uint32_t actual = htonl(inVal);
            inStream.write((char*) &actual, sizeof(actual));
        }
        /// \brief Write a Xilinx-style header string to the stream.
        void writeHeaderString(std::ostream& inStream, const string& inString) {
            // write the string length
            uint16_t length = inString.length() + 1;
            write(inStream, uint16_t(length));
            inStream.write(inString.c_str(), length);
        }
        /// \brief Look for the expected uint8_t in the stream and return true if it matches.
        static bool expect(std::istream& inStream, uint8_t inExpected) {
            // read the actual data from the stream
            uint8_t actual = 0;
            inStream.read((char*) &actual, sizeof(actual));
            // return equality
            return inExpected == actual;
        }
        /// \brief Look for the expected uint16_t in the stream and return true if it matches.
        static bool expect(std::istream& inStream, uint16_t inExpected) {
            // read the actual data from the stream
            uint16_t actual = 0;
            inStream.read((char*) &actual, sizeof(actual));
            // return equality
            return inExpected == ntohs(actual);
        }
        /// \brief Look for the expected uint32_t in the stream and return true if it matches.
        static bool expect(std::istream& inStream, uint32_t inExpected) {
            // read the actual data from the stream
            uint32_t actual = 0;
            inStream.read((char*) &actual, sizeof(actual));
            // return equality
            return inExpected == ntohl(actual);
        }
//      /// \brief Look for the expected string in the stream and return true if it matches.
//      static bool expect(std::istream& inStream, const string& inExpected) {
//          // look for the length;
//          if(!expect(inStream, (uint16_t) inExpected.size())) return false;
//          // create a buffer to use
//          int adjustedLength = inExpected.size() + 1;
//          char* buffer = new char[adjustedLength];
//          // read the actual data from the stream
//          inStream.read(buffer, adjustedLength);
//          return buffer == inExpected;
//      }
        /// \brief Read and return a bitstream header string.
        static void readHeaderString(std::istream& inStream, string& outString) {
            // read the string length
            uint16_t length = 0;
            inStream.read((char*) &length, sizeof(length));
            length = ntohs(length);
            if(length > 0) {
                // create a buffer
                char* buffer = new char[length];
                // read the null-terminated string
                inStream.read(buffer, length);
                // copy the data into the string
                outString.assign(buffer, length - 1);
                delete[] buffer;
            } else {
                outString.clear();
            }
        }
        /// \brief Read a bitstream header, and return its fields.
        static bool readHeader(std::istream& inStream, string& outDesignName, 
            string& outDeviceName, string& outDesignDate, string& outDesignTime, 
            uint32_t& outBitstreamLength, uint32_t& outHeaderLength) {
            // assume success unless we find otherwise
            bool success = true;
            // read the magic length
            success &= expect(inStream, uint16_t(0x0009));
            // read the magic bytes
            success &= expect(inStream, uint32_t(0x0ff00ff0));
            success &= expect(inStream, uint32_t(0x0ff00ff0));
            success &= expect(inStream, uint8_t(0x00));
            // read the mysterious 0x0001
            success &= expect(inStream, uint16_t(0x0001));
            // read the 'a' byte
            success &= expect(inStream, uint8_t('a'));
            // read the design name length
            readHeaderString(inStream, outDesignName);
            // read the 'b' byte
            success &= expect(inStream, uint8_t('b'));
            // read the device name length
            readHeaderString(inStream, outDeviceName);
            // read the 'c' byte
            success &= expect(inStream, uint8_t('c'));
            // read the design date length
            readHeaderString(inStream, outDesignDate);
            // read the 'd' byte
            success &= expect(inStream, uint8_t('d'));
            // read the design time length
            readHeaderString(inStream, outDesignTime);
            // read the 'e' byte
            success &= expect(inStream, uint8_t('e'));
            // read the inStream length
            inStream.read((char*) &outBitstreamLength, sizeof(outBitstreamLength));
            outBitstreamLength = ntohl(outBitstreamLength);
            // determine the header length
            outHeaderLength = 34 + outDesignName.length() + outDeviceName.length() 
                + outDesignDate.length() + outDesignTime.length();
            // return the result
            return success;
        }
        /// \brief Clean up the header date and time by replacing embedded spaces with zeros.
        void cleanDateAndTime(void) {
            // some versions of the tools leave spaces inside the date and time fields
            size_t pos = 0;
            while((pos = mDesignDate.find(' ', pos)) != string::npos) mDesignDate[pos] = '0';
            pos = 0;
            while((pos = mDesignTime.find(' ', pos)) != string::npos) mDesignTime[pos] = '0';
        }
    // inner class
        struct Subfield {
            /// \brief The subfield bit mask.
            uint32_t mMask;
            /// \brief The subfield LSB position.
            uint32_t mShift;
            /// \brief The subfield name documented in bitgen.
            const char* mBitgenName;
            /// \brief The subfield name documented in the configuration guide.
            const char* mConfigGuideName;
            /// \brief The default subfield value.
            uint32_t mDefault;
            /// \brief The allowable subfield values.
            const char** mValues;
        };
        /// \brief Insert 32 bit subfield settings into an output stream.
        static void writeSubfieldSettings(std::ostream& inStream, uint32_t inWord, 
            const Subfield* inSubfields);
        /// \brief Insert 16 bit subfield settings into an output stream.
        static void writeSubfieldSettings(std::ostream& inStream, uint16_t inWord, 
            const Subfield* inSubfields);
        /// \brief Initialize the maps between frame indexes and frame addresses.
        /// \detail This is generally only useful for internal purposes.
        /// \todo This function should be made pure virtual.
        virtual void initializeDeviceInfo(const std::string& inDeviceName) {}
        /// \brief Initialize the maps between frame indexes and frame addresses.
        /// \detail This is generally only useful for internal purposes.
        virtual void initializeFrameMaps(void) {}
        /// \brief Output static device information to a stream.
        /// \details This is used to generate the static column maps for bitstream frame mapping.
        virtual void writeDeviceInfo(std::ostream& inStream, const std::string& inDeviceName);
    // accessors
        /// \brief Assign static device information for the current bitstream.
        void setDeviceInfo(const DeviceInfo& rhs) { mDeviceInfo = rhs; }
        /// \brief Assign the device enumeration constant for the given device name.
        void setDevice(const std::string& inDeviceName) {
            mDevice = torc::common::Devices::getDeviceEnum(inDeviceName);
        }
    // members
        /// \brief Bitstream device enumeration.
        EDevice mDevice;
        /// \brief Header design name.
        string mDesignName;
        /// \brief Header device name.
        string mDeviceName;
        /// \brief Header design date.
        string mDesignDate;
        /// \brief Header design time.
        string mDesignTime;
        /// \brief Bitstream packet length in bytes.
        /// \details This is the length in bytes of all the bitstream packets, without the 
        ///     bitstream header.
        uint32_t mBitstreamByteLength;
        /// \brief Header length in bytes.
        /// \details This is the length of the header itself, as opposed to mBitstreamByteLength, 
        ///     which is the length of bitstream reported by the header.
        uint32_t mHeaderByteLength;
    // members for frame addressing
        /// \brief Column type widths.
        ColumnDefVector mColumnDefs;
        /// \brief Mapping from tile type names to column types.
        typedef std::map<std::string, uint32_t> TileTypeNameToColumnType;
        TileTypeNameToColumnType mTileTypeNameToColumnType;
        /// \brief Mapping from tile indexes to column types.
        typedef std::map<uint16_t, uint32_t> TileTypeIndexToColumnType;
        TileTypeIndexToColumnType mTileTypeIndexToColumnType;
        /// \brief Device information.
        DeviceInfo mDeviceInfo;
    public:
    // constructors
        /// \brief Basic constructor.
        Bitstream(void) : mDevice(torc::common::eDeviceInvalid), mBitstreamByteLength(0) {}
        /// \brief Virtual destructor.
        virtual ~Bitstream(void) {}
    // functions
        /// \brief Read the bitstream header and packets from a stream.
        virtual void read(std::istream& inStream, bool inCleanDateAndTime = true) {
            readHeader(inStream);
            readPackets(inStream);
            if(inCleanDateAndTime) cleanDateAndTime();
        }
        /// \brief Read the bitstream packets
        virtual void readPackets(std::istream& inStream) {}
        /// \brief Read the bitstream header.
        virtual void readHeader(std::istream& inStream) {
            readHeader(inStream, mDesignName, mDeviceName, mDesignDate, mDesignTime, 
                mBitstreamByteLength, mHeaderByteLength);
            setDevice(mDeviceName);
        }
        /// \brief Write the bitstream header and packets to a stream.
        virtual void write(std::ostream& inStream) {
            preflightPackets();
            updatePacketLength();
            writeHeader(inStream);
            writePackets(inStream);
        }
        /// \brief Preflight the packets.
        virtual void preflightPackets(void) {}
        /// \brief Update the header packet length.
        virtual void updatePacketLength(void) {}
        /// \brief Write the bitstream packets.
        virtual void writePackets(std::ostream& inStream) {}
        /// \brief Write the bitstream header to the stream.
        virtual void writeHeader(std::ostream& inStream) {
            // write the magic length
            write(inStream, uint16_t(0x0009));
            // write the magic bytes with null termination
            write(inStream, uint32_t(0x0ff00ff0));
            write(inStream, uint32_t(0x0ff00ff0));
            write(inStream, uint8_t(0x00));
            // write the mysterious 0x0001
            write(inStream, uint16_t(0x0001));
            // write the 'a' byte and the design name
            write(inStream, uint8_t('a'));
            writeHeaderString(inStream, mDesignName);
            // write the 'b' byte and the device name
            write(inStream, uint8_t('b'));
            writeHeaderString(inStream, mDeviceName);
            // write the 'c' byte and the design date
            write(inStream, uint8_t('c'));
            writeHeaderString(inStream, mDesignDate);
            // write the 'd' byte and the design time
            write(inStream, uint8_t('d'));
            writeHeaderString(inStream, mDesignTime);
            // write the 'e' byte and the design name
            write(inStream, uint8_t('e'));
            write(inStream, uint32_t(mBitstreamByteLength));
        }
    // inserters
        /// \brief Insert the bitstream header into an output stream.
        friend std::ostream& operator<< (std::ostream& os, const Bitstream& rhs);
    // accessors
        /// \brief Set the design name.
        void setDesignName(const string& inDesignName) { mDesignName = inDesignName; }
        /// \brief Set the device name.
        void setDeviceName(const string& inDeviceName) { mDeviceName = inDeviceName; }
        /// \brief Set the design date.
        void setDesignDate(const string& inDesignDate) { mDesignDate = inDesignDate; }
        /// \brief Set the design time.
        void setDesignTime(const string& inDesignTime) { mDesignTime = inDesignTime; }
        /// \brief Return the design name.
        const string& getDesignName(void) const { return mDesignName; }
        /// \brief Return the device name.
        const string& getDeviceName(void) const { return mDeviceName; }
        /// \brief Return the design date.
        const string& getDesignDate(void) const { return mDesignDate; }
        /// \brief Return the design time.
        const string& getDesignTime(void) const { return mDesignTime; }
        /// \brief Return the bitstream packet length in bytes.
        /// \details The length includes all packet data, but does not include the bitstream header.
        uint32_t getBitstreamByteLength(void) const { return mBitstreamByteLength; }
        /// \brief Return the bitstream header length in bytes.
        uint32_t getHeaderByteLength(void) const { return mHeaderByteLength; }
        /// \brief Return the frame length for the current device.
        virtual uint32_t getFrameLength(void) const { return 0; }
    };

} // namespace bitstream
} // namespace torc

#endif // TORC_BITSTREAM_BITSTREAM_HPP

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