summaryrefslogtreecommitdiffstats
path: root/libkexiv2/libkexiv2/kexiv2private.cpp
blob: 4cca2be6450f8006d5d33abf2701add1eae403f7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
/* ============================================================
 *
 * This file is a part of kipi-plugins project
 * http://www.kipi-plugins.org
 *
 * Date        : 2007-09-03
 * Description : Exiv2 library interface for KDE
 *
 * Copyright (C) 2006-2009 by Gilles Caulier <caulier dot gilles at gmail dot com>
 * Copyright (C) 2006-2009 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
 *
 * NOTE: Do not use kdDebug() in this implementation because
 *       it will be multithreaded. Use tqDebug() instead.
 *       See B.K.O #133026 for details.
 *
 * 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, 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.
 *
 * ============================================================ */

// Local includes.

#include "kexiv2private.h"

namespace KExiv2Iface
{

KExiv2Priv::KExiv2Priv()
{
    imageComments = std::string();
}

KExiv2Priv::~KExiv2Priv()
{
#ifdef _XMP_SUPPORT_
    // Fix memory leak if Exiv2 support XMP.
    Exiv2::XmpParser::terminate();
#endif // _XMP_SUPPORT_
}

bool KExiv2Priv::setExif(Exiv2::DataBuf const data)
{
    try
    {
        if (data.size_ != 0)
        {
#if (EXIV2_TEST_VERSION(0,17,91))
            Exiv2::ExifParser::decode(exifMetadata, data.pData_, data.size_);
            return (!exifMetadata.empty());
#else
            if (exifMetadata.load(data.pData_, data.size_) != 0)
                return false;
            else
                return true;
#endif
        }
    }
    catch( Exiv2::Error &e )
    {
        if (!filePath.isEmpty())
            tqDebug ("From file %s", filePath.ascii());

        printExiv2ExceptionError("Cannot set Exif data using Exiv2 ", e);
    }

    return false;
}

bool KExiv2Priv::setIptc(Exiv2::DataBuf const data)
{
    try
    {
        if (data.size_ != 0)
        {
#if (EXIV2_TEST_VERSION(0,17,91))
            Exiv2::IptcParser::decode(iptcMetadata, data.pData_, data.size_);
            return (!iptcMetadata.empty());
#else
            if (iptcMetadata.load(data.pData_, data.size_) != 0)
                return false;
            else
                return true;
#endif
        }
    }
    catch( Exiv2::Error &e )
    {
        if (!filePath.isEmpty())
            tqDebug ("From file %s", filePath.ascii());

        printExiv2ExceptionError("Cannot set Iptc data using Exiv2 ", e);
    }

    return false;
}

void KExiv2Priv::printExiv2ExceptionError(const TQString& msg, Exiv2::Error& e)
{
    std::string s(e.what());
    tqDebug("%s (Error #%i: %s)", msg.ascii(), e.code(), s.c_str());
}

TQString KExiv2Priv::convertCommentValue(const Exiv2::Exifdatum &exifDatum)
{
    try
    {
        std::string comment;
        std::string charset;

#if (EXIV2_TEST_VERSION(0,11,0))
        comment = exifDatum.toString();
#else
        // workaround for bug in TIFF parser: CommentValue is loaded as DataValue
        const Exiv2::Value &value = exifDatum.value();
        Exiv2::byte *data = new Exiv2::byte[value.size()];
        value.copy(data, Exiv2::invalidByteOrder);
        Exiv2::CommentValue commentValue;
        // this read method is hidden in CommentValue
        static_cast<Exiv2::Value &>(commentValue).read(data, value.size(), Exiv2::invalidByteOrder);
        comment = commentValue.toString();
        delete [] data;
#endif

        // libexiv2 will prepend "charset=\"SomeCharset\" " if charset is specified
        // Before conversion to TQString, we must know the charset, so we stay with std::string for a while
        if (comment.length() > 8 && comment.substr(0, 8) == "charset=")
        {
            // the prepended charset specification is followed by a blank
            std::string::size_type pos = comment.find_first_of(' ');
            if (pos != std::string::npos)
            {
                // extract string between the = and the blank
                charset = comment.substr(8, pos-8);
                // get the rest of the string after the charset specification
                comment = comment.substr(pos+1);
            }
        }

        if (charset == "\"Unicode\"")
        {
            // TQString expects a null-terminated UCS-2 string.
            // Is it already null terminated? In any case, add termination "\0\0" for safety.
            comment.resize(comment.length() + 2, '\0');
            return TQString::fromUcs2((unsigned short *)comment.data());
        }
        else if (charset == "\"Jis\"")
        {
            TQTextCodec *codec = TQTextCodec::codecForName("JIS7");
            return codec->toUnicode(comment.c_str());
        }
        else if (charset == "\"Ascii\"")
        {
            return TQString::fromLatin1(comment.c_str());
        }
        else
        {
            return detectEncodingAndDecode(comment);
        }
    }
    catch( Exiv2::Error &e )
    {
        printExiv2ExceptionError("Cannot convert Comment using Exiv2 ", e);
    }

    return TQString();
}

TQString KExiv2Priv::detectEncodingAndDecode(const std::string &value)
{
    // For charset autodetection, we could use sophisticated code
    // (Mozilla chardet, TDEHTML's autodetection, TQTextCodec::codecForContent),
    // but that is probably too much.
    // We check for UTF8, Local encoding and ASCII.

    if (value.empty())
        return TQString();

#if KDE_IS_VERSION(3,2,0)
    if (KStringHandler::isUtf8(value.c_str()))
    {
        return TQString::fromUtf8(value.c_str());
    }
#else
    // anyone who is still running KDE 3.0 or 3.1 is missing so many features
    // that he will have to accept this missing feature.
    return TQString::fromUtf8(value.c_str());
#endif

    // Utf8 has a pretty unique byte pattern.
    // Thats not true for ASCII, it is not possible
    // to reliably autodetect different ISO-8859 charsets.
    // We try if TQTextCodec can decide here, otherwise we use Latin1.
    // Or use local8Bit as default?

    // load TQTextCodecs
    TQTextCodec *latin1Codec = TQTextCodec::codecForName("iso8859-1");
    //TQTextCodec *utf8Codec   = TQTextCodec::codecForName("utf8");
    TQTextCodec *localCodec  = TQTextCodec::codecForLocale();

    // make heuristic match
    int latin1Score = latin1Codec->heuristicContentMatch(value.c_str(), value.length());
    int localScore  = localCodec->heuristicContentMatch(value.c_str(), value.length());

    // convert string:
    // Use whatever has the larger score, local or ASCII
    if (localScore >= 0 && localScore >= latin1Score)
    {
        // workaround for bug #134999:
        // The TQLatin15Codec may crash if strlen < value.length()
        int length = value.length();
        if (localCodec->name() == TQString::fromLatin1("ISO 8859-15"))
            length = strlen(value.c_str());
        return localCodec->toUnicode(value.c_str(), length);
    }
    else
        return TQString::fromLatin1(value.c_str());
}

}  // NameSpace KExiv2Iface