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xlsb_parser.cpp
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xlsb_parser.cpp
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/****************************************************************************
**
** DocToText - Converts DOC, XLS, XLSB, PPT, RTF, ODF (ODT, ODS, ODP),
** OOXML (DOCX, XLSX, PPTX), iWork (PAGES, NUMBERS, KEYNOTE),
** ODFXML (FODP, FODS, FODT), PDF, EML and HTML documents to plain text.
** Extracts metadata and annotations.
**
** Copyright (c) 2006-2013, SILVERCODERS(R)
** http://silvercoders.com
**
** Project homepage: http://silvercoders.com/en/products/doctotext
**
** This program may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file COPYING.GPL included in the
** packaging of this file.
**
** Please remember that any attempt to workaround the GNU General Public
** License using wrappers, pipes, client/server protocols, and so on
** is considered as license violation. If your program, published on license
** other than GNU General Public License version 2, calls some part of this
** code directly or indirectly, you have to buy commercial license.
** If you do not like our point of view, simply do not use the product.
**
** Licensees holding valid commercial license for this product
** may use this file in accordance with the license published by
** SILVERCODERS and appearing in the file COPYING.COM
**
** 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.
**
*****************************************************************************/
#include "xlsb_parser.h"
#include <algorithm>
#include "doctotext_unzip.h"
#include <iostream>
#include <map>
#include "metadata.h"
#include "misc.h"
#include <sstream>
#include <stdint.h>
#include <vector>
struct XLSBParser::Implementation
{
struct XLSBContent
{
class ErrorsCodes : public std::map<uint32_t, std::string>
{
public:
ErrorsCodes()
{
insert(std::pair<uint32_t, std::string>(0x00, "#NULL!"));
insert(std::pair<uint32_t, std::string>(0x07, "#DIV/0!"));
insert(std::pair<uint32_t, std::string>(0x0F, "#VALUE!"));
insert(std::pair<uint32_t, std::string>(0x17, "#REF!"));
insert(std::pair<uint32_t, std::string>(0x1D, "#NAME?"));
insert(std::pair<uint32_t, std::string>(0x24, "#NUM!"));
insert(std::pair<uint32_t, std::string>(0x2A, "#N/A"));
insert(std::pair<uint32_t, std::string>(0x2B, "#GETTING_DATA"));
}
};
ErrorsCodes m_error_codes;
std::vector<std::string> m_shared_strings;
uint32_t m_row_start, m_row_end, m_col_start, m_col_end;
uint32_t m_current_column, m_current_row;
XLSBContent()
{
m_row_start = 0;
m_row_end = 0;
m_col_start = 0;
m_col_end = 0;
m_current_column = 0;
m_current_row = 0;
}
};
bool m_error;
const char* m_buffer;
size_t m_buffer_size;
std::string m_file_name;
bool m_verbose_logging;
std::ostream* m_log_stream;
XLSBContent m_xlsb_content;
class XLSBReader
{
public:
enum RecordType
{
BRT_ROW_HDR = 0x0,
BRT_CELL_BLANK = 0x1,
BRT_CELL_RK = 0x2,
BRT_CELL_ERROR = 0x3,
BRT_CELL_BOOL = 0x4,
BRT_CELL_REAL = 0x5,
BRT_CELL_ST = 0x6,
BRT_CELL_ISST = 0x7,
BRT_FMLA_STRING = 0x8,
BRT_FMLA_NUM = 0x9,
BRT_FMLA_BOOL = 0xA,
BRT_FMLA_ERROR = 0xB,
BRT_SS_ITEM = 0x13,
BRT_WS_DIM = 0x94,
BRT_BEGIN_SST = 0x9F
};
struct Record
{
uint32_t m_type;
uint32_t m_size;
Record()
{
m_type = 0;
m_size = 0;
}
};
private:
DocToTextUnzip* m_zipfile;
std::vector<unsigned char> m_chunk;
int m_chunk_len;
int m_pointer;
unsigned long m_file_size;
unsigned long m_readed;
std::ostream* m_log_stream;
std::string m_file_name;
public:
XLSBReader(DocToTextUnzip& zipfile, const std::string& file_name, std::ostream* log_stream)
{
m_zipfile = &zipfile;
m_file_name = file_name;
m_log_stream = log_stream;
m_chunk_len = 0;
m_pointer = 0;
m_readed = 0;
m_chunk.reserve(1024);
m_file_size = 0;
zipfile.getFileSize(file_name, m_file_size);
}
bool done()
{
return m_readed == m_file_size;
}
bool readNum(uint32_t& value, int bytes)
{
value = 0;
if (m_chunk_len - m_pointer < bytes)
{
*m_log_stream << "Unexpected end of buffer\n";
return false;
}
for (int i = 0; i < bytes; ++i)
value += (m_chunk[m_pointer++] << (i * 8));
return true;
}
bool readUint8(uint32_t& value)
{
return readNum(value, 1);
}
bool readUint16(uint32_t& value)
{
return readNum(value, 2);
}
bool readUint32(uint32_t& value)
{
return readNum(value, 4);
}
bool readXnum(double& value)
{
uint8_t* val_ptr = (uint8_t*)&value;
if (m_chunk_len - m_pointer < 8)
{
*m_log_stream << "Unexpected end of buffer\n";
return false;
}
for (int i = 0; i < 8; ++i)
val_ptr[8 - i] = m_chunk[m_pointer++];
return true;
}
bool readRkNumber(double& value, bool& is_int)
{
value = 0;
uint32_t uvalue;
if (!readNum(uvalue, 4))
return false;
bool fx100 = (uvalue & 0x00000001) > 0;
bool fint = (uvalue & 0x00000002) > 0;
if (fint)
{
is_int = true;
int svalue = (int) uvalue;
svalue /= 4; //remove 2 last bits
if (fx100)
svalue /= 100;
value = svalue;
}
else
{
is_int = false;
uvalue = uvalue & 0xFFFFFFFC;
uint64_t* val_ptr = (uint64_t*)&value;
uint32_t* uval_ptr = (uint32_t*)&uvalue;
*val_ptr = (uint64_t)*uval_ptr << 32;
if (fx100)
value /= 100.0;
}
return true;
}
bool readXlWideString(std::string& str)
{
uint32_t str_size;
if (!readNum(str_size, 4))
return false;
if (str_size * 2 > m_chunk_len - m_pointer)
{
*m_log_stream << "XLWideString is bigger than size of the record\n";
return false;
}
str.reserve(2 * str_size);
for (int i = 0; i < str_size; ++i)
{
unsigned int uc = *((unsigned short*)&m_chunk[m_pointer]);
m_pointer += 2;
if (uc != 0)
{
if (utf16_unichar_has_4_bytes(uc))
{
if (++i >= str_size)
{
*m_log_stream << "Unexpected end of buffer.\n";
return false;
}
uc = (uc << 16) | *((unsigned short*)&m_chunk[m_pointer]);
m_pointer += 2;
}
str += unichar_to_utf8(uc);
}
}
return true;
}
bool readRichStr(std::string& str)
{
//skip first byte
if (m_chunk_len == m_pointer)
{
*m_log_stream << "Unexpected end of buffer\n";
return false;
}
++m_pointer;
if (!readXlWideString(str))
return false;
return true;
}
bool readRecord(Record& record)
{
record.m_type = 0;
record.m_size = 0;
for (int i = 0; i < 2; ++i) //read record type
{
if (!readChunk(1))
return false;
uint32_t byte = m_chunk[m_pointer++];
record.m_type += ((byte & 0x7F) << (i * 7));
if (byte < 128)
break;
}
for (int i = 0; i < 4; ++i) //read record size
{
if (m_pointer == m_chunk_len && !readChunk(1))
return false;
uint32_t byte = m_chunk[m_pointer++];
record.m_size += ((byte & 0x7F) << (i * 7));
if (byte < 128)
break;
}
if (!readChunk(record.m_size))
return false;
return true;
}
bool skipBytes(uint32_t bytes_to_skip)
{
if (bytes_to_skip <= m_chunk_len - m_pointer)
m_pointer += bytes_to_skip;
else
*m_log_stream << "Unexpected end of buffer\n";
return true;
}
bool readChunk(uint32_t len)
{
if (len == 0)
return true;
m_chunk.reserve(len + 1);
if (!m_zipfile->readChunk(m_file_name, (char*)&m_chunk[0], len, m_chunk_len))
{
*m_log_stream << "Error while reading file: " + m_file_name + "\n";
return false;
}
m_readed += m_chunk_len;
if (m_chunk_len != len)
{
*m_log_stream << "Read past EOF during reading " + m_file_name + "\n";
return false;
}
m_pointer = 0;
return true;
}
};
bool parseRecordForSharedStrings(XLSBReader& xlsb_reader, XLSBReader::Record& record)
{
switch (record.m_type)
{
case XLSBReader::BRT_BEGIN_SST:
{
if (!xlsb_reader.skipBytes(4))
return false;
uint32_t strings_count = 0;
if (!xlsb_reader.readUint32(strings_count))
return false;
m_xlsb_content.m_shared_strings.reserve(strings_count);
return true;
}
case XLSBReader::BRT_SS_ITEM:
{
m_xlsb_content.m_shared_strings.push_back(std::string());
std::string* new_string = &m_xlsb_content.m_shared_strings[m_xlsb_content.m_shared_strings.size() - 1];
if (!xlsb_reader.readRichStr(*new_string))
return false;
return true;
}
}
return true;
}
bool parseColumn(XLSBReader& xlsb_reader, std::string& text)
{
uint32_t column;
if (!xlsb_reader.readUint32(column))
return false;
if (m_xlsb_content.m_current_column > 0)
text += " ";
while (column > m_xlsb_content.m_current_column)
{
text += " ";
++m_xlsb_content.m_current_column;
}
if (!xlsb_reader.skipBytes(4))
return false;
m_xlsb_content.m_current_column = column + 1;
return true;
}
bool parseRecordForWorksheets(XLSBReader& xlsb_reader, XLSBReader::Record& record, std::string& text)
{
switch (record.m_type)
{
case XLSBReader::BRT_CELL_BLANK:
{
if (!parseColumn(xlsb_reader, text))
return false;
return true;
}
case XLSBReader::BRT_FMLA_ERROR:
case XLSBReader::BRT_CELL_ERROR:
{
if (!parseColumn(xlsb_reader, text))
return false;
uint32_t value;
if (!xlsb_reader.readUint8(value))
return false;
text += m_xlsb_content.m_error_codes[value];
return true;
}
case XLSBReader::BRT_FMLA_BOOL:
case XLSBReader::BRT_CELL_BOOL:
{
if (!parseColumn(xlsb_reader, text))
return false;
uint32_t value;
if (!xlsb_reader.readUint8(value))
return false;
if (value)
text += "1";
else
text += "0";
return true;
}
case XLSBReader::BRT_FMLA_NUM:
case XLSBReader::BRT_CELL_REAL:
{
if (!parseColumn(xlsb_reader, text))
return false;
double value;
if (!xlsb_reader.readXnum(value))
return false;
std::ostringstream os;
os << value;
text += os.str();
return true;
}
case XLSBReader::BRT_FMLA_STRING:
case XLSBReader::BRT_CELL_ST:
{
if (!parseColumn(xlsb_reader, text))
return false;
if (!xlsb_reader.readXlWideString(text))
return false;
return true;
}
case XLSBReader::BRT_WS_DIM:
{
bool s = true;
s = s && xlsb_reader.readUint32(m_xlsb_content.m_row_start);
s = s && xlsb_reader.readUint32(m_xlsb_content.m_row_end);
s = s && xlsb_reader.readUint32(m_xlsb_content.m_col_start);
s = s && xlsb_reader.readUint32(m_xlsb_content.m_col_end);
return s;
}
case XLSBReader::BRT_ROW_HDR:
{
uint32_t row;
if (!xlsb_reader.readUint32(row))
return false;
for (int i = m_xlsb_content.m_current_row; i < row; ++i)
text += "\n";
m_xlsb_content.m_current_row = row;
m_xlsb_content.m_current_column = 0;
return true;
}
case XLSBReader::BRT_CELL_RK:
{
if (!parseColumn(xlsb_reader, text))
return false;
double value;
bool is_int;
if (!xlsb_reader.readRkNumber(value, is_int))
return false;
std::ostringstream os;
if (!is_int)
os << value;
else
os << (int)value;
text += os.str();
return true;
}
case XLSBReader::BRT_CELL_ISST:
{
if (!parseColumn(xlsb_reader, text))
return false;
uint32_t str_index;
if (!xlsb_reader.readUint32(str_index))
return false;
if (str_index >= m_xlsb_content.m_shared_strings.size())
*m_log_stream << "Warning: Detected reference to string that does not exist\n";
else
text += m_xlsb_content.m_shared_strings[str_index];
return true;
}
};
return true;
}
bool parseSharedStrings(DocToTextUnzip& unzip)
{
XLSBReader::Record record;
std::string file_name = "xl/sharedStrings.bin";
if (!unzip.exists(file_name))
{
//file may not exist, nothing wrong is with that.
if (m_verbose_logging)
*m_log_stream << "File: " + file_name + " does not exist\n";
return true;
}
XLSBReader xlsb_reader(unzip, file_name, m_log_stream);
while (!xlsb_reader.done())
{
if (!xlsb_reader.readRecord(record))
{
m_error = true;
return false;
}
if (!parseRecordForSharedStrings(xlsb_reader, record))
{
m_error = true;
return false;
}
}
unzip.closeReadingFileForChunks();
return true;
}
bool parseWorksheets(DocToTextUnzip& unzip, std::string& text)
{
XLSBReader::Record record;
int sheet_index = 1;
std::string sheet_file_name = "xl/worksheets/sheet1.bin";
while (unzip.exists(sheet_file_name))
{
XLSBReader xlsb_reader(unzip, sheet_file_name, m_log_stream);
while (!xlsb_reader.done())
{
if (!xlsb_reader.readRecord(record))
{
m_error = true;
return false;
}
if (!parseRecordForWorksheets(xlsb_reader, record, text))
{
m_error = true;
return false;
}
}
unzip.closeReadingFileForChunks();
++sheet_index;
std::ostringstream os;
os << sheet_index;
sheet_file_name = "xl/worksheets/sheet" + os.str() + ".bin";
text += "\n\n";
}
return true;
}
void parseXLSB(DocToTextUnzip& unzip, std::string& text)
{
text.reserve(1024 * 1024);
if (!unzip.loadDirectory())
{
*m_log_stream << "Cant load zip directory";
m_error = true;
return;
}
if (!parseSharedStrings(unzip))
return;
if (!parseWorksheets(unzip, text))
return;
}
void readMetadata(DocToTextUnzip& unzip, Metadata& metadata)
{
std::string data;
if (!unzip.read("docProps/app.xml", &data))
{
*m_log_stream << "Error reading docProps/app.xml\n";
m_error = true;
return;
}
if (data.find("<TitlesOfParts>") != std::string::npos && data.find("</TitlesOfParts>") != std::string::npos)
{
data.erase(data.find("</TitlesOfParts>"));
data.erase(0, data.find("<TitlesOfParts>") + 15);
size_t pages_count_start = data.find("<vt:vector size=\"");
if (pages_count_start != std::string::npos)
metadata.setPageCount(strtol(data.c_str() + pages_count_start + 17, NULL, 10));
}
data.clear();
if (!unzip.read("docProps/core.xml", &data))
{
*m_log_stream << "Error reading docProps/core.xml\n";
m_error = true;
return;
}
bool author_exist = data.find("<dc:creator/>") == std::string::npos && data.find("<dc:creator") != std::string::npos;
if (author_exist)
{
size_t author_start = data.find("<dc:creator");
size_t author_end = data.find("</dc:creator>");
std::string author = data.substr(author_start + 11, author_end - author_start - 11);
if (author.find(">") != std::string::npos)
{
author.erase(0, author.find(">") + 1);
if (author.length() > 0)
metadata.setAuthor(author);
}
}
bool last_modify_by_exist = data.find("<cp:lastModifiedBy/>") == std::string::npos && data.find("<cp:lastModifiedBy") != std::string::npos;
if (last_modify_by_exist)
{
size_t last_modify_by_start = data.find("<cp:lastModifiedBy");
size_t last_modify_by_end = data.find("</cp:lastModifiedBy>");
std::string last_modify_by = data.substr(last_modify_by_start + 18, last_modify_by_end - last_modify_by_start - 18);
if (last_modify_by.find(">") != std::string::npos)
{
last_modify_by.erase(0, last_modify_by.find(">") + 1);
if (last_modify_by.length() > 0)
metadata.setLastModifiedBy(last_modify_by);
}
}
bool creation_date_exist = data.find("<dcterms:created/>") == std::string::npos && data.find("<dcterms:created") != std::string::npos;
if (creation_date_exist)
{
size_t creation_date_start = data.find("<dcterms:created");
size_t creation_date_end = data.find("</dcterms:created>");
std::string creation_date = data.substr(creation_date_start + 16, creation_date_end - creation_date_start - 16);
if (creation_date.find(">") != std::string::npos)
{
creation_date.erase(0, creation_date.find(">") + 1);
tm creation_date_tm;
if (creation_date.length() > 0 && string_to_date(creation_date, creation_date_tm))
metadata.setCreationDate(creation_date_tm);
}
}
bool last_modification_date_exist = data.find("<dcterms:modified/>") == std::string::npos && data.find("<dcterms:modified") != std::string::npos;
if (last_modification_date_exist)
{
size_t last_modification_date_start = data.find("<dcterms:modified");
size_t last_modification_date_end = data.find("</dcterms:modified>");
std::string last_modification_date = data.substr(last_modification_date_start + 17, last_modification_date_end - last_modification_date_start - 17);
if (last_modification_date.find(">") != std::string::npos)
{
last_modification_date.erase(0, last_modification_date.find(">") + 1);
tm last_modification_date_tm;
if (last_modification_date.length() > 0 && string_to_date(last_modification_date, last_modification_date_tm))
metadata.setLastModificationDate(last_modification_date_tm);
}
}
}
};
XLSBParser::XLSBParser(const std::string& file_name)
{
impl = new Implementation();
impl->m_error = false;
impl->m_file_name = file_name;
impl->m_verbose_logging = false;
impl->m_log_stream = &std::cerr;
impl->m_buffer = NULL;
impl->m_buffer_size = 0;
}
XLSBParser::XLSBParser(const char *buffer, size_t size)
{
impl = new Implementation();
impl->m_error = false;
impl->m_file_name = "Memory buffer";
impl->m_verbose_logging = false;
impl->m_log_stream = &std::cerr;
impl->m_buffer = buffer;
impl->m_buffer_size = size;
}
XLSBParser::~XLSBParser()
{
delete impl;
}
void XLSBParser::setVerboseLogging(bool verbose)
{
impl->m_verbose_logging = verbose;
}
void XLSBParser::setLogStream(std::ostream& log_stream)
{
impl->m_log_stream = &log_stream;
}
bool XLSBParser::isXLSB()
{
DocToTextUnzip unzip;
if (impl->m_buffer)
unzip.setBuffer(impl->m_buffer, impl->m_buffer_size);
else
unzip.setArchiveFile(impl->m_file_name);
impl->m_error = false;
bool res_open = unzip.open();
if (res_open == false)
{
*impl->m_log_stream << "Cannot unzip file.\n";
return false;
}
if (!unzip.exists("xl/workbook.bin"))
{
unzip.close();
*impl->m_log_stream << "Cannot find xl/woorkbook.bin.\n";
return false;
}
unzip.close();
return true;
}
void XLSBParser::getLinks(std::vector<Link>& links)
{
#warning TODO: Implement this functionality.
}
Metadata XLSBParser::metaData()
{
Metadata metadata;
impl->m_error = false;
if (!isXLSB())
{
impl->m_error = true;
*impl->m_log_stream << "This file is not proper xlsb file.\n";
return metadata;
}
DocToTextUnzip unzip;
if (impl->m_buffer)
unzip.setBuffer(impl->m_buffer, impl->m_buffer_size);
else
unzip.setArchiveFile(impl->m_file_name);
bool res_open = unzip.open();
if (res_open == false)
{
*impl->m_log_stream << "Cannot unzip file.\n";
impl->m_error = true;
return metadata;
}
if (!unzip.exists("docProps/app.xml"))
{
unzip.close();
*impl->m_log_stream << "Cannot find docProps/app.xml.\n";
impl->m_error = true;
return metadata;
}
if (!unzip.exists("docProps/core.xml"))
{
unzip.close();
*impl->m_log_stream << "Cannot find docProps/core.xml.\n";
impl->m_error = true;
return metadata;
}
impl->readMetadata(unzip, metadata);
unzip.close();
return metadata;
}
std::string XLSBParser::plainText(const FormattingStyle& formatting)
{
std::string text;
impl->m_error = false;
if (!isXLSB())
{
impl->m_error = true;
*impl->m_log_stream << "This file is not proper xlsb file.\n";
return text;
}
DocToTextUnzip unzip;
if (impl->m_buffer)
unzip.setBuffer(impl->m_buffer, impl->m_buffer_size);
else
unzip.setArchiveFile(impl->m_file_name);
bool res_open = unzip.open();
if (res_open == false)
{
*impl->m_log_stream << "Cannot unzip file.\n";
impl->m_error = true;
return text;
}
impl->parseXLSB(unzip, text);
unzip.close();
return text;
}
bool XLSBParser::error()
{
return impl->m_error;
}