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tio.cpp
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tio.cpp
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/*
DJVU read code taken fromdvutxt.c:
//C- DjVuLibre-3.5
//C- Copyright (c) 2002 Leon Bottou and Yann Le Cun.
//C- Copyright (c) 2001 AT&T
//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library from
//C- Lizardtech Software. Lizardtech Software has authorized us to
//C- replace the original DjVu(r) Reference Library notice by the following
//C- text (see doc/lizard2002.djvu and doc/lizardtech2007.djvu):
//C-
//C- ------------------------------------------------------------------
//C- | DjVu (r) Reference Library (v. 3.5)
//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
//C- | The DjVu Reference Library is protected by U.S. Pat. No.
//C- | 6,058,214 and patents pending.
//C- |
//C- | This software is subject to, and may be distributed under, the
//C- | GNU General Public License, either Version 2 of the license,
//C- | or (at your option) any later version. The license should have
//C- | accompanied the software or you may obtain a copy of the license
//C- | from the Free Software Foundation at http://www.fsf.org .
//C- |
//C- | The computer code originally released by LizardTech under this
//C- | license and unmodified by other parties is deemed "the LIZARDTECH
//C- | ORIGINAL CODE." Subject to any third party intellectual property
//C- | claims, LizardTech grants recipient a worldwide, royalty-free,
//C- | non-exclusive license to make, use, sell, or otherwise dispose of
//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the
//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU
//C- | General Public License. This grant only confers the right to
//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to
//C- | the extent such infringement is reasonably necessary to enable
//C- | recipient to make, have made, practice, sell, or otherwise dispose
//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to
//C- | any greater extent that may be necessary to utilize further
//C- | modifications or combinations.
//C- |
//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//C- +------------------------------------------------------------------
*/
#include <iostream>
//#include <iconv.h>
#include <QFile>
#include <QXmlStreamReader>
#include <QDataStream>
#include <QTextStream>
#include <QDebug>
#include <QTextCodec>
//////////////////FOR PDF
#include <stdio.h>
//YOur project must also include zdll.lib (ZLIB) as a dependency.
//ZLIB can be freely downloaded from the internet, www.zlib.org
//Use 4 byte struct alignment in your project!
#include <zlib.h>
//////////////////
/*
with cmake - Qt5/Qt6 poppler
with qmake - Qt4/Qt5 poppler
*/
#if defined (POPPLER_ENABLE)
#if QT_VERSION_MAJOR == 6
#include <poppler-qt6.h>
#endif
#if QT_VERSION_MAJOR == 5
#include <poppler-qt5.h>
#endif
#if QT_VERSION_MAJOR == 4
#include <poppler-qt4.h>
#endif
#endif
#if defined (DJVU_ENABLE)
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <locale.h>
#include <fcntl.h>
#include <errno.h>
#include <libdjvu/miniexp.h>
#include <libdjvu/ddjvuapi.h>
#endif
#include "tio.h"
#include "utils.h"
#include "tzipper.h"
#include "textproc.h"
using namespace std;
QString extract_text_from_xml (const QString &string_data, const QStringList &tags)
{
QString data;
QXmlStreamReader xml (string_data);
bool tt = false;
while (! xml.atEnd())
{
xml.readNext();
QString tag_name = xml.qualifiedName().toString().toLower();
for (QList <QString>::const_iterator ts = tags.begin(); ts != tags.end(); ++ts)
{
if (xml.isStartElement() && tag_name == *ts)
tt = true;
if (xml.isEndElement() && tag_name == *ts)
tt = false;
}
if (tt && xml.isCharacters())
{
QString s = xml.text().toString();
if (! s.isEmpty())
{
data.append (s);
data.append("\n");
}
}
}
if (xml.hasError())
qDebug() << "xml parse error";
return data;
}
bool CTioPlainText::load (const QString &fname)
{
QFile file (fname);
if (! file.open (QFile::ReadOnly))
{
error_string = file.errorString();
return false;
}
QByteArray block = file.read (4096);
eol = "\n";
if (block.indexOf ("\r\n") != -1)
eol = "\r\n";
else
if (block.indexOf ('\n') != -1)
eol = "\n";
else
if (block.indexOf ('\r') != -1)
eol = "\r";
file.seek(0);
// QTextStream in (&file);
// in.setCodec (charset.toUtf8().data());
QByteArray ba = file.readAll();
QTextCodec *codec = QTextCodec::codecForName (charset.toUtf8().data());
data = codec->toUnicode (ba);
if (eol == "\r\n")
data.replace (eol, "\n");
else
if (eol == "\r")
data.replace (eol, "\n");
file.close();
return true;
}
bool CTioPlainText::save (const QString &fname)
{
QFile file (fname);
if (! file.open (QFile::WriteOnly))
{
error_string = file.errorString();
return false;
}
QTextCodec *codec = QTextCodec::codecForName(charset.toUtf8().data());
QByteArray ba = codec->fromUnicode(data);
file.write(ba);
file.close();
return true;
}
CTioHandler::CTioHandler()
{
default_handler = new CTioPlainText;
list.push_back (default_handler);
list.push_back (new CTioGzip);
list.push_back (new CTioXMLZipped);
list.push_back (new CTioODT);
list.push_back (new CTioABW);
list.push_back (new CTioFB2);
list.push_back (new CTioRTF);
list.push_back (new CTioEpub);
#if defined (POPPLER_ENABLE)
list.push_back (new CTioPDF);
#endif
#if defined (DJVU_ENABLE)
list.push_back (new CTioDJVU);
#endif
}
CTioHandler::~CTioHandler()
{
if (list.size() > 0)
for (vector <size_t>::size_type i = 0; i < list.size(); i++)
delete list[i];
}
CTio* CTioHandler::get_for_fname (const QString &fname)
{
CTio *instance;
QString ext = file_get_ext (fname).toLower();
for (vector <size_t>::size_type i = 0; i < list.size(); i++)
{
instance = list.at (i);
if (instance->extensions.indexOf (ext) != -1)
return instance;
}
return default_handler;
}
CTioPlainText::CTioPlainText()
{
ronly = false;
}
CTioGzip::CTioGzip()
{
ronly = true;
extensions.append ("gz");
}
bool CTioGzip::load (const QString &fname)
{
QByteArray a = gzip_deflateFile (fname);
data = a.data();
return true;
}
bool CTioReadOnly::save (const QString &fname)
{
error_string = tr ("Saving for this format is not supported");
return false;
}
CTioABW::CTioABW()
{
ronly = true;
extensions.append ("abw");
}
bool CTioABW::load (const QString &fname)
{
QString temp = qstring_load (fname);
QStringList tags;
tags.append ("p");
data = extract_text_from_xml (temp, tags);
return true;
}
bool CTioODT::load (const QString &fname)
{
data.clear();
CZipper zipper;
if (! zipper.read_as_utf8 (fname, "content.xml"))
{
qDebug() << "cannot read content.xml";
return false;
}
QXmlStreamReader xml (zipper.string_data);
bool tt = false;
while (! xml.atEnd())
{
xml.readNext();
QString tag_name = xml.qualifiedName().toString().toLower();
if (xml.isStartElement())
{
if (tag_name == "text:s")
{
QXmlStreamAttributes attrs = xml.attributes();
if (attrs.hasAttribute("text:c"))
{
QString av = attrs.value ("text:c").toString();
QString fillval;
fillval = fillval.fill (' ', av.toInt());
data.append (fillval);
}
}
}
if (xml.isEndElement())
{
if (tag_name.startsWith ("text") && tag_name != "text:span")
tt = true;
}
if (xml.isCharacters() && tt)
{
tt = false;
data.append (xml.text().toString());
data.append ("\n");
}
}
if (xml.hasError())
qDebug() << "xml parse error";
return true;
}
CTioODT::CTioODT()
{
ronly = true;
extensions.append ("odt");
extensions.append ("sxw");
}
CTioXMLZipped::CTioXMLZipped()
{
ronly = true;
extensions.append ("kwd");
extensions.append ("docx");
}
bool CTioXMLZipped::load (const QString &fname)
{
data.clear();
QString source_fname;
QString ts;
QString ext = file_get_ext (fname);
if (ext == "kwd")
{
source_fname = "maindoc.xml";
ts = "text";
}
else
if (ext == "docx")
{
source_fname = "word/document.xml";
ts = "w:t";
}
CZipper zipper;
if (! zipper.read_as_utf8 (fname, source_fname))
return false;
QStringList tags;
tags.append (ts);
data = extract_text_from_xml (zipper.string_data, tags);
return true;
}
CCharsetMagic::CCharsetMagic()
{
QStringList fnames = read_dir_entries (":/encsign");
CSignaturesList *koi8u = NULL;
CSignaturesList *koi8r = NULL;
for (int i = 0; i < fnames.size(); i++)
{
QString fn = fnames.at(i);
QString fname = ":/encsign/";
fname.append (fn);
QByteArray a = file_load (fname);
QList<QByteArray> bsl = a.split (',');
CSignaturesList *sl = new CSignaturesList;
sl->encname = fn;
if (fn == "KOI8-R")
koi8r = sl;
if (fn == "KOI8-U")
koi8u = sl;
//fill with signatures
for (int j = 0; j < bsl.count(); j++)
sl->words.append (bsl[j]);
signatures.push_back (sl);
}
//the following is needed to correct detection KOI8-R/U
std::vector<CSignaturesList*>::iterator it1 = std::find(signatures.begin(), signatures.end(), koi8u);
std::vector<CSignaturesList*>::iterator it2 = std::find(signatures.begin(), signatures.end(), koi8r);
std::swap (*it1, *it2);
// qDebug() << "signatures.size: " << signatures.size();
/*
int ku = signatures.indexOf (koi8u);
int kr = signatures.indexOf (koi8r);
//#if QT_VERSION >= 0x051300
#if (QT_VERSION_MAJOR >= 5 && QT_VERSION_MINOR >= 13)
signatures.swapItemsAt (ku, kr);
#else
signatures.swap (ku, kr);
#endif
*/
}
CCharsetMagic::~CCharsetMagic()
{
if (signatures.size() > 0)
for (vector <size_t>::size_type i = 0; i < signatures.size(); i++)
delete signatures[i];
}
//from https://stackoverflow.com/questions/28270310/how-to-easily-detect-utf8-encoding-in-the-string
bool is_valid_utf8 (const char *string)
{
if (! string)
return true;
const unsigned char * bytes = (const unsigned char *)string;
unsigned int cp;
int num;
while (*bytes != 0x00)
{
if ((*bytes & 0x80) == 0x00)
{
// U+0000 to U+007F
cp = (*bytes & 0x7F);
num = 1;
}
else if ((*bytes & 0xE0) == 0xC0)
{
// U+0080 to U+07FF
cp = (*bytes & 0x1F);
num = 2;
}
else if ((*bytes & 0xF0) == 0xE0)
{
// U+0800 to U+FFFF
cp = (*bytes & 0x0F);
num = 3;
}
else if ((*bytes & 0xF8) == 0xF0)
{
// U+10000 to U+10FFFF
cp = (*bytes & 0x07);
num = 4;
}
else
return false;
bytes += 1;
for (int i = 1; i < num; ++i)
{
if ((*bytes & 0xC0) != 0x80)
return false;
cp = (cp << 6) | (*bytes & 0x3F);
bytes += 1;
}
if ((cp > 0x10FFFF) ||
((cp >= 0xD800) && (cp <= 0xDFFF)) ||
((cp <= 0x007F) && (num != 1)) ||
((cp >= 0x0080) && (cp <= 0x07FF) && (num != 2)) ||
((cp >= 0x0800) && (cp <= 0xFFFF) && (num != 3)) ||
((cp >= 0x10000) && (cp <= 0x1FFFFF) && (num != 4)))
return false;
}
return true;
}
QString CCharsetMagic::guess_for_file (const QString &fname)
{
QString enc = "UTF-8";
QByteArray bafile = file_load (fname);
QString ext = file_get_ext (fname);
if (ext == "html" ||
ext == "htm" ||
ext == "xhtml")
{
QTextCodec *defcodec = QTextCodec::codecForName ("UTF-8");
QTextCodec *codec = QTextCodec::codecForHtml (bafile, defcodec);
return codec->name();
}
if (is_valid_utf8 (bafile.data()))
return enc;
if (signatures.size() > 0)
for (vector <size_t>::size_type i = 0; i < signatures.size(); i++)
for (int x = 0; x < signatures[i]->words.count(); x++)
{
if (bafile.contains (signatures[i]->words[x]))
{
enc = signatures[i]->encname;
return enc;
}
}
return enc;
}
CTioFB2::CTioFB2()
{
ronly = true;
extensions.append ("fb2");
}
bool CTioFB2::load (const QString &fname)
{
data.clear();
QByteArray ba = file_load (fname);
if (ba.isEmpty())
return false;
//read encoding:
QString enc = string_between (QString (ba), "encoding=\"", "\"");
if (enc.isEmpty())
enc = "UTF-8";
QTextCodec *codec = QTextCodec::codecForName (enc.toLatin1().data());
QString temp = codec->toUnicode (ba);
QString ts = "p";
QXmlStreamReader xml (temp);
bool tt = false;
while (! xml.atEnd())
{
xml.readNext();
QString tag_name = xml.qualifiedName().toString().toLower();
if (xml.isStartElement())
{
if (tag_name == ts)
tt = true;
}
if (xml.isEndElement())
{
if (tag_name == ts)
tt = false;
if (tag_name == "title")
data.append ("\n");
if (tag_name == "section")
data.append ("\n");
}
if (tt && xml.isCharacters())
{
QString s = xml.text().toString();
if (! s.isEmpty())
{
data.append (" ");
data.append (s);
data.append ("\n");
}
}
}
if (xml.hasError())
qDebug() << "xml parse error";
return true;
}
//www.codeguru.com/forum/archive/index.php/t-201658.html
//rewritten by Peter Semiletov
QString rtf_strip (const QString &rtf)
{
int length = rtf.size();
if (length < 4)
return QString();
int start = 0;
start = rtf.indexOf ("\\pard");
if ( start < 1)
return QString();
QString strCopy;
strCopy.reserve (length);
int k = 0;
bool slash = false; //is backslash followed by the space
bool figure_opened = false; //is opening figure brace followed by the space
bool figure_closed = false; //is closing brace followed by the space
bool first_space = false; //else spaces are in plain text and must be included to the result
QChar ch;
for (int j = start; j < length; j++)
{
ch = rtf.at (j);
if (ch == '\\')//we are looking at the backslash
{
first_space = true;
slash = true;
}
else
if (ch == '{')
{
first_space = true;
figure_opened = true;
}
else
if (ch == '}')
{
first_space = true;
figure_closed = true;
}
else
if (ch == ' ')// &&
//(rtf.indexOf ("\\datafield", j - 10) + 10) != j)
{
slash = false;
figure_opened = false;
figure_closed = false;
}
if ( ch == '\\')
{
QChar chr = rtf.at (j + 1);
if (chr == '{') //if the text contains symbol '{'
{
slash = false;
figure_opened = false;
figure_closed = false;
first_space = false;
strCopy += '{';
j++;
k++;
continue;
}
if (chr == '}') //if the text contains symbol '}'
{
slash = false;
figure_opened = false;
figure_closed = false;
first_space = false;
strCopy += '}';
j++;
k++;
continue;
}
if (chr == '\\')//if the text contains symbol '\'
{
slash = false;
figure_opened = false;
figure_closed = false;
first_space = false;
strCopy += '\\';
j++;
continue;
}
}
if (rtf.at (j) == '\\' &&
rtf.at (j + 1) == 'p' &&
rtf.at (j + 2) == 'a' &&
rtf.at (j + 3) == 'r' &&
rtf.at (j + 4) != 'd')
{
slash = false;
figure_opened = false;
figure_closed = false;
first_space = false;
strCopy += '\n';
j += 4;
continue;
}
if (slash == false &&
figure_opened == false &&
figure_closed == false &&
ch != '\n')
{
if (! first_space)
strCopy += ch;
else
first_space = false;
}
}
return strCopy;
}
CTioRTF::CTioRTF()
{
ronly = true;
extensions.append ("rtf");
}
bool CTioRTF::load (const QString &fname)
{
QByteArray ba = file_load (fname);
QString text;
text.reserve (ba.size());
int i = 0;
int l = ba.size();
QString ansicgp;
int n = ba.indexOf ("ansicpg");
if (n != -1)
{
int m = ba.indexOf ('\\', n);
n += 7;
ansicgp = ba.mid (n, m - n);
}
if (ansicgp.isEmpty()) //assuming unicode
{
while (i < l)
if ((ba.at(i) == '\\') && (ba.at(i + 1) == 'u'))
{
QByteArray ta = ba.mid (i, 7);
ta = ta.mid (2, 4);
QChar c (ta.toInt());
text.append (c);
i += 7 + 3;
}
else
{
text.append (ba.at(i));
i++;
}
}
else
{
ansicgp.prepend ("CP");
QTextCodec *codec = QTextCodec::codecForName (ansicgp.toUtf8().data());
//qDebug() << "not unicode!";
while (i < l)
if ((ba.at(i) == '\\') && (ba.at(i + 1) == '\''))
{
QByteArray ta = ba.mid (i, 4);
ta = ta.mid (2, 2);
QByteArray bh = ta.fromHex (ta);
text.append (codec->toUnicode (bh));
i += 4;
}
else
{
text.append (ba.at(i));
i++;
}
}
data = rtf_strip (text);
return true;
}
#if defined (POPPLER_ENABLE)
CTioPDF::CTioPDF()
{
ronly = true;
extensions.append ("pdf");
}
bool CTioPDF::load (const QString &fname)
{
Poppler::Document *d = Poppler::Document::load (fname);
if (! d)
return false;
if (d->isLocked())
{
delete d;
return false;
}
int pages_count = d->numPages();
for (int i = 0; i < pages_count; i++)
{
Poppler::Page *p = d->page (i);
QList<Poppler::TextBox*> tb = p->textList();
for (int j = 0; j < tb.size(); j++)
{
data += tb[j]->text();
//if (tb[j]->hasSpaceAfter())
data += " ";
delete tb[j];
}
}
delete d;
return true;
}
#endif
#if defined (DJVU_ENABLE)
const char *detail = 0;
int escape = 0;
QString temp_data_s;
ddjvu_context_t *ctx;
ddjvu_document_t *doc;
void djvumsg_handle()
{
const ddjvu_message_t *msg;
if (! ctx)
return;
msg = ddjvu_message_wait (ctx);
while ((msg = ddjvu_message_peek (ctx)))
{
if (msg->m_any.tag == DDJVU_ERROR)
{
qDebug() << msg->m_error.message;
qDebug() << msg->m_error.filename << ":" << msg->m_error.lineno;
return;
}
ddjvu_message_pop(ctx);
}
}
void dopage (int pageno)
{
miniexp_t r = miniexp_nil;
const char *lvl = (detail) ? detail : "page";
while ((r = ddjvu_document_get_pagetext (doc, pageno, lvl)) == miniexp_dummy)
djvumsg_handle();
if ((r = miniexp_nth (5, r)) && miniexp_stringp (r))
{
const char *s = miniexp_to_str (r);
if (s)
{
temp_data_s.append (s);
temp_data_s.append ('\n');
}
}
}
CTioDJVU::CTioDJVU()
{
ronly = true;
extensions.append ("djvu");
}
bool CTioDJVU::load (const QString &fname)
{
if (! (ctx = ddjvu_context_create ("tea")))
return false;
if (! (doc = ddjvu_document_create_by_filename (ctx, fname.toUtf8().data(), TRUE)))
return false;
while (! ddjvu_document_decoding_done (doc))
djvumsg_handle();
int n = ddjvu_document_get_pagenum (doc);
for (int i = 0; i < n; i++)
dopage (i);
if (doc)
ddjvu_document_release (doc);
if (ctx)
ddjvu_context_release (ctx);
data = temp_data_s;
return true;
}
#endif
CTioEpub::CTioEpub()
{
ronly = true;
extensions.append ("epub");
}
bool CTioEpub::load (const QString &fname)
{
data.clear();
QStringList html_files;