// ***************************************************************** -*- C++ -*-
/*
 * Copyright (C) 2004-2008 Andreas Huggel <ahuggel@gmx.net>
 *
 * This program is part of the Exiv2 distribution.
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
 */
/*
  File:      value.cpp
  Version:   $Rev$
  Author(s): Andreas Huggel (ahu) <ahuggel@gmx.net>
  History:   26-Jan-04, ahu: created
             11-Feb-04, ahu: isolated as a component
             31-Jul-04, brad: added Time, Date and String values
 */
// *****************************************************************************
#include "rcsid.hpp"
EXIV2_RCSID("@(#) $Id$")

// *****************************************************************************
// included header files
#include "value.hpp"
#include "types.hpp"
#include "error.hpp"

// + standard includes
#include <iostream>
#include <iomanip>
#include <sstream>
#include <cassert>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <ctype.h>

// *****************************************************************************
// class member definitions
namespace Exiv2 {

    Value::Value(TypeId typeId)
        : ok_(true), type_(typeId)
    {
    }

    Value& Value::operator=(const Value& rhs)
    {
        if (this == &rhs) return *this;
        type_ = rhs.type_;
        ok_ = rhs.ok_;
        return *this;
    }

    Value::AutoPtr Value::create(TypeId typeId)
    {
        AutoPtr value;
        switch (typeId) {
        case invalidTypeId:
            value = AutoPtr(new DataValue(invalidTypeId));
            break;
        case unsignedByte:
            value = AutoPtr(new DataValue(unsignedByte));
            break;
        case asciiString:
            value = AutoPtr(new AsciiValue);
            break;
        case unsignedShort:
            value = AutoPtr(new ValueType<uint16_t>);
            break;
        case unsignedLong:
            value = AutoPtr(new ValueType<uint32_t>);
            break;
        case unsignedRational:
            value = AutoPtr(new ValueType<URational>);
            break;
        case signedByte:
            value = AutoPtr(new DataValue(signedByte));
            break;
        case undefined:
            value = AutoPtr(new DataValue);
            break;
        case signedShort:
            value = AutoPtr(new ValueType<int16_t>);
            break;
        case signedLong:
            value = AutoPtr(new ValueType<int32_t>);
            break;
        case signedRational:
            value = AutoPtr(new ValueType<Rational>);
            break;
        case string:
            value = AutoPtr(new StringValue);
            break;
        case date:
            value = AutoPtr(new DateValue);
            break;
        case time:
            value = AutoPtr(new TimeValue);
            break;
        case comment:
            value = AutoPtr(new CommentValue);
            break;
        case xmpText:
            value = AutoPtr(new XmpTextValue);
            break;
        case xmpBag:
        case xmpSeq:
        case xmpAlt:
            value = AutoPtr(new XmpArrayValue(typeId));
            break;
        case langAlt:
            value = AutoPtr(new LangAltValue);
            break;
        default:
            value = AutoPtr(new DataValue(typeId));
            break;
        }
        return value;
    } // Value::create

    int Value::setDataArea(const byte* /*buf*/, long /*len*/)
    {
        return -1;
    }

    std::string Value::toString() const
    {
        std::ostringstream os;
        write(os);
        ok_ = !os.fail();
        return os.str();
    }

    std::string Value::toString(long /*n*/) const
    {
        return toString();
    }

    int DataValue::read(const byte* buf, long len, ByteOrder /*byteOrder*/)
    {
        // byteOrder not needed
        value_.assign(buf, buf + len);
        return 0;
    }

    int DataValue::read(const std::string& buf)
    {
        std::istringstream is(buf);
        int tmp;
        value_.clear();
        while (!(is.eof())) {
            is >> tmp;
            if (is.fail()) return 1;
            value_.push_back(static_cast<byte>(tmp));
        }
        return 0;
    }

    long DataValue::copy(byte* buf, ByteOrder /*byteOrder*/) const
    {
        // byteOrder not needed
        return static_cast<long>(
            std::copy(value_.begin(), value_.end(), buf) - buf
            );
    }

    long DataValue::size() const
    {
        return static_cast<long>(value_.size());
    }

    DataValue* DataValue::clone_() const
    {
        return new DataValue(*this);
    }

    std::ostream& DataValue::write(std::ostream& os) const
    {
        std::vector<byte>::size_type end = value_.size();
        for (std::vector<byte>::size_type i = 0; i != end; ++i) {
            os << static_cast<int>(value_[i]) << " ";
        }
        return os;
    }

    std::string DataValue::toString(long n) const
    {
        std::ostringstream os;
        os << static_cast<int>(value_[n]);
        ok_ = !os.fail();
        return os.str();
    }

    long DataValue::toLong(long n) const
    {
        ok_ = true;
        return value_[n];
    }

    float DataValue::toFloat(long n) const
    {
        ok_ = true;
        return value_[n];
    }

    Rational DataValue::toRational(long n) const
    {
        ok_ = true;
        return Rational(value_[n], 1);
    }

    StringValueBase& StringValueBase::operator=(const StringValueBase& rhs)
    {
        if (this == &rhs) return *this;
        Value::operator=(rhs);
        value_ = rhs.value_;
        return *this;
    }

    int StringValueBase::read(const std::string& buf)
    {
        value_ = buf;
        return 0;
    }

    int StringValueBase::read(const byte* buf, long len, ByteOrder /*byteOrder*/)
    {
        // byteOrder not needed
        if (buf) value_ = std::string(reinterpret_cast<const char*>(buf), len);
        return 0;
    }

    long StringValueBase::copy(byte* buf, ByteOrder /*byteOrder*/) const
    {
        // byteOrder not needed
        assert(buf != 0);
        return static_cast<long>(
            value_.copy(reinterpret_cast<char*>(buf), value_.size())
            );
    }

    long StringValueBase::size() const
    {
        return static_cast<long>(value_.size());
    }

    std::ostream& StringValueBase::write(std::ostream& os) const
    {
        return os << value_;
    }

    long StringValueBase::toLong(long n) const
    {
        ok_ = true;
        return value_[n];
    }

    float StringValueBase::toFloat(long n) const
    {
        ok_ = true;
        return value_[n];
    }

    Rational StringValueBase::toRational(long n) const
    {
        ok_ = true;
        return Rational(value_[n], 1);
    }

    StringValue* StringValue::clone_() const
    {
        return new StringValue(*this);
    }

    int AsciiValue::read(const std::string& buf)
    {
        value_ = buf;
        if (value_.size() > 0 && value_[value_.size()-1] != '\0') value_ += '\0';
        return 0;
    }

    AsciiValue* AsciiValue::clone_() const
    {
        return new AsciiValue(*this);
    }

    std::ostream& AsciiValue::write(std::ostream& os) const
    {
        // Strip all trailing '\0's (if any)
        std::string::size_type pos = value_.find_last_not_of('\0');
        return os << value_.substr(0, pos + 1);
    }

    CommentValue::CharsetTable::CharsetTable(CharsetId charsetId,
                                             const char* name,
                                             const char* code)
        : charsetId_(charsetId), name_(name), code_(code)
    {
    }

    //! Lookup list of supported IFD type information
    const CommentValue::CharsetTable CommentValue::CharsetInfo::charsetTable_[] = {
        CharsetTable(ascii,            "Ascii",            "ASCII\0\0\0"),
        CharsetTable(jis,              "Jis",              "JIS\0\0\0\0\0"),
        CharsetTable(unicode,          "Unicode",          "UNICODE\0"),
        CharsetTable(undefined,        "Undefined",        "\0\0\0\0\0\0\0\0"),
        CharsetTable(invalidCharsetId, "InvalidCharsetId", "\0\0\0\0\0\0\0\0"),
        CharsetTable(lastCharsetId,    "InvalidCharsetId", "\0\0\0\0\0\0\0\0")
    };

    const char* CommentValue::CharsetInfo::name(CharsetId charsetId)
    {
        return charsetTable_[ charsetId < lastCharsetId ? charsetId : undefined ].name_;
    }

    const char* CommentValue::CharsetInfo::code(CharsetId charsetId)
    {
        return charsetTable_[ charsetId < lastCharsetId ? charsetId : undefined ].code_;
    }

    CommentValue::CharsetId CommentValue::CharsetInfo::charsetIdByName(
        const std::string& name)
    {
        int i = 0;
        for (;    charsetTable_[i].charsetId_ != lastCharsetId
               && charsetTable_[i].name_ != name; ++i) {}
        return charsetTable_[i].charsetId_ == lastCharsetId ?
               invalidCharsetId : charsetTable_[i].charsetId_;
    }

    CommentValue::CharsetId CommentValue::CharsetInfo::charsetIdByCode(
        const std::string& code)
    {
        int i = 0;
        for (;    charsetTable_[i].charsetId_ != lastCharsetId
               && std::string(charsetTable_[i].code_, 8) != code; ++i) {}
        return charsetTable_[i].charsetId_ == lastCharsetId ?
               invalidCharsetId : charsetTable_[i].charsetId_;
    }

    CommentValue::CommentValue(const std::string& comment)
        : StringValueBase(Exiv2::undefined)
    {
        read(comment);
    }

    int CommentValue::read(const std::string& comment)
    {
        std::string c = comment;
        CharsetId charsetId = undefined;
        if (comment.length() > 8 && comment.substr(0, 8) == "charset=") {
            std::string::size_type pos = comment.find_first_of(' ');
            std::string name = comment.substr(8, pos-8);
            // Strip quotes (so you can also specify the charset without quotes)
            if (name[0] == '"') name = name.substr(1);
            if (name[name.length()-1] == '"') name = name.substr(0, name.length()-1);
            charsetId = CharsetInfo::charsetIdByName(name);
            if (charsetId == invalidCharsetId) {
#ifndef SUPPRESS_WARNINGS
                std::cerr << "Warning: " << Error(28, name) << "\n";
#endif
                return 1;
            }
            c.clear();
            if (pos != std::string::npos) c = comment.substr(pos+1);
        }
        const std::string code(CharsetInfo::code(charsetId), 8);
        return StringValueBase::read(code + c);
    }

    std::ostream& CommentValue::write(std::ostream& os) const
    {
        CharsetId charsetId = this->charsetId();
        if (charsetId != undefined) {
            os << "charset=\"" << CharsetInfo::name(charsetId) << "\" ";
        }
        return os << comment();
    }

    std::string CommentValue::comment() const
    {
        if (value_.length() >= 8) return value_.substr(8);
        return "";
    }

    CommentValue::CharsetId CommentValue::charsetId() const
    {
        CharsetId charsetId = undefined;
        if (value_.length() >= 8) {
            const std::string code = value_.substr(0, 8);
            charsetId = CharsetInfo::charsetIdByCode(code);
        }
        return charsetId;
    }

    CommentValue* CommentValue::clone_() const
    {
        return new CommentValue(*this);
    }

    XmpValue::XmpValue(TypeId typeId)
        : Value(typeId),
          xmpArrayType_(xaNone),
          xmpStruct_(xsNone)
    {
    }

    XmpValue& XmpValue::operator=(const XmpValue& rhs)
    {
        if (this == &rhs) return *this;
        xmpArrayType_ = rhs.xmpArrayType_;
        xmpStruct_ = rhs.xmpStruct_;
        return *this;
    }

    void XmpValue::setXmpArrayType(XmpArrayType xmpArrayType)
    {
        xmpArrayType_ = xmpArrayType;
    }

    void XmpValue::setXmpStruct(XmpStruct xmpStruct)
    {
        xmpStruct_ = xmpStruct;
    }

    XmpValue::XmpArrayType XmpValue::xmpArrayType() const
    {
        return xmpArrayType_;
    }

    XmpValue::XmpArrayType XmpValue::xmpArrayType(TypeId typeId)
    {
        XmpArrayType xa = xaNone;
        switch (typeId) {
        case xmpAlt: xa = xaAlt; break;
        case xmpBag: xa = xaBag; break;
        case xmpSeq: xa = xaSeq; break;
        default: break;
        }
        return xa;
    }

    XmpValue::XmpStruct XmpValue::xmpStruct() const
    {
        return xmpStruct_;
    }

    long XmpValue::copy(byte* buf,
                        ByteOrder /*byteOrder*/) const
    {
        std::ostringstream os;
        write(os);
        std::string s = os.str();
		std::memcpy(buf, &s[0], s.size());
        return static_cast<long>(s.size());
    }

    int XmpValue::read(const byte* buf,
                       long len,
                       ByteOrder /*byteOrder*/)
    {
        std::string s(reinterpret_cast<const char*>(buf), len);
        return read(s);
    }

    long XmpValue::size() const
    {
        std::ostringstream os;
        write(os);
        return static_cast<long>(os.str().size());
    }

    XmpTextValue::XmpTextValue()
        : XmpValue(xmpText)
    {
    }

    XmpTextValue::XmpTextValue(const std::string& buf)
        : XmpValue(xmpText)
    {
        read(buf);
    }

    int XmpTextValue::read(const std::string& buf)
    {
        // support a type=Alt,Bag,Seq,Struct indicator
        std::string b = buf;
        std::string type;
        if (buf.length() > 5 && buf.substr(0, 5) == "type=") {
            std::string::size_type pos = buf.find_first_of(' ');
            type = buf.substr(5, pos-5);
            // Strip quotes (so you can also specify the type without quotes)
            if (type[0] == '"') type = type.substr(1);
            if (type[type.length()-1] == '"') type = type.substr(0, type.length()-1);
            b.clear();
            if (pos != std::string::npos) b = buf.substr(pos+1);
        }
        if (!type.empty()) {
            if (type == "Alt") {
                setXmpArrayType(XmpValue::xaAlt);
            }
            else if (type == "Bag") {
                setXmpArrayType(XmpValue::xaBag);
            }
            else if (type == "Seq") {
                setXmpArrayType(XmpValue::xaSeq);
            }
            else if (type == "Struct") {
                setXmpStruct();
            }
            else {
                throw Error(48, type);
            }
        }
        value_ = b;
        return 0;
    }

    XmpTextValue::AutoPtr XmpTextValue::clone() const
    {
        return AutoPtr(clone_());
    }

    long XmpTextValue::size() const
    {
        return static_cast<long>(value_.size());
    }

    long XmpTextValue::count() const
    {
        return size();
    }

    std::ostream& XmpTextValue::write(std::ostream& os) const
    {
        bool del = false;
        if (xmpArrayType() != XmpValue::xaNone) {
            switch (xmpArrayType()) {
            case XmpValue::xaAlt: os << "type=\"Alt\""; break;
            case XmpValue::xaBag: os << "type=\"Bag\""; break;
            case XmpValue::xaSeq: os << "type=\"Seq\""; break;
            case XmpValue::xaNone: break; // just to suppress the warning
            }
            del = true;
        }
        else if (xmpStruct() != XmpValue::xsNone) {
            switch (xmpStruct()) {
            case XmpValue::xsStruct: os << "type=\"Struct\""; break;
            case XmpValue::xsNone: break; // just to suppress the warning
            }
            del = true;
        }
        if (del && !value_.empty()) os << " ";
        return os << value_;
    }

    long XmpTextValue::toLong(long /*n*/) const
    {
        return parseLong(value_, ok_);
    }

    float XmpTextValue::toFloat(long /*n*/) const
    {
        return parseFloat(value_, ok_);
    }

    Rational XmpTextValue::toRational(long /*n*/) const
    {
        return parseRational(value_, ok_);
    }

    XmpTextValue* XmpTextValue::clone_() const
    {
        return new XmpTextValue(*this);
    }

    XmpArrayValue::XmpArrayValue(TypeId typeId)
        : XmpValue(typeId)
    {
        setXmpArrayType(xmpArrayType(typeId));
    }

    int XmpArrayValue::read(const std::string& buf)
    {
        value_.push_back(buf);
        return 0;
    }

    XmpArrayValue::AutoPtr XmpArrayValue::clone() const
    {
        return AutoPtr(clone_());
    }

    long XmpArrayValue::count() const
    {
        return static_cast<long>(value_.size());
    }

    std::ostream& XmpArrayValue::write(std::ostream& os) const
    {
        for (std::vector<std::string>::const_iterator i = value_.begin();
             i != value_.end(); ++i) {
            if (i != value_.begin()) os << ", ";
            os << *i;
        }
        return os;
    }

    std::string XmpArrayValue::toString(long n) const 
    {
        ok_ = true;
        return value_[n]; 
    }

    long XmpArrayValue::toLong(long n) const
    {
        return parseLong(value_[n], ok_);
    }

    float XmpArrayValue::toFloat(long n) const
    {
        return parseFloat(value_[n], ok_);
    }

    Rational XmpArrayValue::toRational(long n) const
    {
        return parseRational(value_[n], ok_);
    }

    XmpArrayValue* XmpArrayValue::clone_() const
    {
        return new XmpArrayValue(*this);
    }

    LangAltValue::LangAltValue()
        : XmpValue(langAlt)
    {
    }

    LangAltValue::LangAltValue(const std::string& buf)
        : XmpValue(langAlt)
    {
        read(buf);
    }

    int LangAltValue::read(const std::string& buf)
    {
        std::string b = buf;
        std::string lang = "x-default";
        if (buf.length() > 5 && buf.substr(0, 5) == "lang=") {
            std::string::size_type pos = buf.find_first_of(' ');
            lang = buf.substr(5, pos-5);
            // Strip quotes (so you can also specify the language without quotes)
            if (lang[0] == '"') lang = lang.substr(1);
            if (lang[lang.length()-1] == '"') lang = lang.substr(0, lang.length()-1);
            b.clear();
            if (pos != std::string::npos) b = buf.substr(pos+1);
        }
        value_[lang] = b;
        return 0;
    }

    LangAltValue::AutoPtr LangAltValue::clone() const
    {
        return AutoPtr(clone_());
    }

    long LangAltValue::count() const
    {
        return static_cast<long>(value_.size());
    }

    std::ostream& LangAltValue::write(std::ostream& os) const
    {
        bool first = true;
        // Write the default entry first
        ValueType::const_iterator i = value_.find("x-default");
        if (i != value_.end()) {
            os << "lang=\"" << i->first << "\" " << i->second;
            first = false;
        }
        for (i = value_.begin(); i != value_.end(); ++i) {
            if (i->first == "x-default") continue;
            if (!first) os << ", ";
            os << "lang=\"" << i->first << "\" " << i->second;
            first = false;
        }
        return os;
    }

    std::string LangAltValue::toString(long /*n*/) const 
    {
        return toString("x-default");
    }

    std::string LangAltValue::toString(const std::string& qualifier) const 
    {
        ValueType::const_iterator i = value_.find(qualifier);
        if (i != value_.end()) {
            ok_ = true;
            return i->second;
        }
        ok_ = false;
        return "";
    }

    long LangAltValue::toLong(long /*n*/) const
    {
        ok_ = false;
        return 0;
    }

    float LangAltValue::toFloat(long /*n*/) const
    {
        ok_ = false;
        return 0.0;
    }

    Rational LangAltValue::toRational(long /*n*/) const
    {
        ok_ = false;
        return Rational(0, 0);
    }

    LangAltValue* LangAltValue::clone_() const
    {
        return new LangAltValue(*this);
    }

    DateValue::DateValue() 
        : Value(date)
    {
    }
    
    DateValue::DateValue(int year, int month, int day)
        : Value(date)
    {
        date_.year = year;
        date_.month = month;
        date_.day = day;
    }

    int DateValue::read(const byte* buf, long len, ByteOrder /*byteOrder*/)
    {
        // Hard coded to read Iptc style dates
        if (len != 8) {
#ifndef SUPPRESS_WARNINGS
            std::cerr << "Warning: " << Error(29) << "\n";
#endif
            return 1;
        }
        // Make the buffer a 0 terminated C-string for sscanf
        char b[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        std::memcpy(b, reinterpret_cast<const char*>(buf), 8);
        int scanned = sscanf(b, "%4d%2d%2d",
                             &date_.year, &date_.month, &date_.day);
        if (scanned != 3) {
#ifndef SUPPRESS_WARNINGS
            std::cerr << "Warning: " << Error(29) << "\n";
#endif
            return 1;
        }
        return 0;
    }

    int DateValue::read(const std::string& buf)
    {
        // Hard coded to read Iptc style dates
        if (buf.length() < 8) {
#ifndef SUPPRESS_WARNINGS
            std::cerr << "Warning: " << Error(29) << "\n";
#endif
            return 1;
        }
        int scanned = sscanf(buf.c_str(), "%4d-%d-%d",
                             &date_.year, &date_.month, &date_.day);
        if (scanned != 3) {
#ifndef SUPPRESS_WARNINGS
            std::cerr << "Warning: " << Error(29) << "\n";
#endif
            return 1;
        }
        return 0;
    }

    void DateValue::setDate(const Date& src)
    {
        date_.year = src.year;
        date_.month = src.month;
        date_.day = src.day;
    }

    long DateValue::copy(byte* buf, ByteOrder /*byteOrder*/) const
    {
        // sprintf wants to add the null terminator, so use oversized buffer
        char temp[9];

        int wrote = sprintf(temp, "%04d%02d%02d",
                            date_.year, date_.month, date_.day);
        assert(wrote == 8);
        std::memcpy(buf, temp, 8);
        return 8;
    }

    long DateValue::size() const
    {
        return 8;
    }

    DateValue* DateValue::clone_() const
    {
        return new DateValue(*this);
    }

    std::ostream& DateValue::write(std::ostream& os) const
    {
        return os << date_.year << '-' << std::right
               << std::setw(2) << std::setfill('0') << date_.month << '-'
               << std::setw(2) << std::setfill('0') << date_.day;
    }

    long DateValue::toLong(long /*n*/) const
    {
        // Range of tm struct is limited to about 1970 to 2038
        // This will return -1 if outside that range
        std::tm tms;
        std::memset(&tms, 0, sizeof(tms));
        tms.tm_mday = date_.day;
        tms.tm_mon = date_.month - 1;
        tms.tm_year = date_.year - 1900;
        long l = static_cast<long>(std::mktime(&tms));
        ok_ = (l != -1);
        return l;
    }

    TimeValue::TimeValue() 
        : Value(time)
    {
    }

    TimeValue::TimeValue(int hour, int minute,
                         int second, int tzHour,
                         int tzMinute)
        : Value(date)
    {
        time_.hour = hour;
        time_.minute = minute;
        time_.second = second;
        time_.tzHour = tzHour;
        time_.tzMinute = tzMinute;
    }

    int TimeValue::read(const byte* buf, long len, ByteOrder /*byteOrder*/)
    {
        // Make the buffer a 0 terminated C-string for scanTime[36]
        char b[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        std::memcpy(b, reinterpret_cast<const char*>(buf), (len < 12 ? len : 11));
        // Hard coded to read HHMMSS or Iptc style times
        int rc = 1;
        if (len == 6) {
            // Try to read (non-standard) HHMMSS format
            rc = scanTime3(b, "%2d%2d%2d");
        }
        if (len == 11) {
            rc = scanTime6(b, "%2d%2d%2d%1c%2d%2d");
        }
        if (rc) {
            rc = 1;
#ifndef SUPPRESS_WARNINGS
            std::cerr << "Warning: " << Error(30) << "\n";
#endif
        }
        return rc;
    }

    int TimeValue::read(const std::string& buf)
    {
        // Hard coded to read H:M:S or Iptc style times
        int rc = 1;
        if (buf.length() < 9) {
            // Try to read (non-standard) H:M:S format
            rc = scanTime3(buf.c_str(), "%d:%d:%d");
        }
        else {
            rc = scanTime6(buf.c_str(), "%d:%d:%d%1c%d:%d");
        }
        if (rc) {
            rc = 1;
#ifndef SUPPRESS_WARNINGS
            std::cerr << "Warning: " << Error(30) << "\n";
#endif
        }
        return rc;
    }

    int TimeValue::scanTime3(const char* buf, const char* format)
    {
        int rc = 1;
        Time t;
        int scanned = sscanf(buf, format, &t.hour, &t.minute, &t.second);
        if (   scanned  == 3
            && t.hour   >= 0 && t.hour   < 24
            && t.minute >= 0 && t.minute < 60
            && t.second >= 0 && t.second < 60) {
            time_ = t;
            rc = 0;
        }
        return rc;
    }

    int TimeValue::scanTime6(const char* buf, const char* format)
    {
        int rc = 1;
        Time t;
        char plusMinus;
        int scanned = sscanf(buf, format, &t.hour, &t.minute, &t.second,
                             &plusMinus, &t.tzHour, &t.tzMinute);
        if (   scanned    == 6
            && t.hour     >= 0 && t.hour     < 24
            && t.minute   >= 0 && t.minute   < 60
            && t.second   >= 0 && t.second   < 60
            && t.tzHour   >= 0 && t.tzHour   < 24
            && t.tzMinute >= 0 && t.tzMinute < 60) {
            time_ = t;
            if (plusMinus == '-') {
                time_.tzHour *= -1;
                time_.tzMinute *= -1;
            }
            rc = 0;
        }
        return rc;
    }

    void TimeValue::setTime( const Time& src )
    {
        std::memcpy(&time_, &src, sizeof(time_));
    }

    long TimeValue::copy(byte* buf, ByteOrder /*byteOrder*/) const
    {
        // sprintf wants to add the null terminator, so use oversized buffer
        char temp[12];
        char plusMinus = '+';
        if (time_.tzHour < 0 || time_.tzMinute < 0) plusMinus = '-';

        int wrote = sprintf(temp,
                   "%02d%02d%02d%1c%02d%02d",
                   time_.hour, time_.minute, time_.second,
                   plusMinus, abs(time_.tzHour), abs(time_.tzMinute));

        assert(wrote == 11);
        std::memcpy(buf, temp, 11);
        return 11;
    }

    long TimeValue::size() const
    {
        return 11;
    }

    TimeValue* TimeValue::clone_() const
    {
        return new TimeValue(*this);
    }

    std::ostream& TimeValue::write(std::ostream& os) const
    {
        char plusMinus = '+';
        if (time_.tzHour < 0 || time_.tzMinute < 0) plusMinus = '-';

        return os << std::right
           << std::setw(2) << std::setfill('0') << time_.hour << ':'
           << std::setw(2) << std::setfill('0') << time_.minute << ':'
           << std::setw(2) << std::setfill('0') << time_.second << plusMinus
           << std::setw(2) << std::setfill('0') << abs(time_.tzHour) << ':'
           << std::setw(2) << std::setfill('0') << abs(time_.tzMinute);
    }

    long TimeValue::toLong(long /*n*/) const
    {
        // Returns number of seconds in the day in UTC.
        long result = (time_.hour - time_.tzHour) * 60 * 60;
        result += (time_.minute - time_.tzMinute) * 60;
        result += time_.second;
        if (result < 0) {
            result += 86400;
        }
        ok_ = true;
        return result;
    }

}                                       // namespace Exiv2