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pdfreader.cpp
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pdfreader.cpp
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/* BEGIN_COMMON_COPYRIGHT_HEADER
* (c)LGPL2+
*
*
* Copyright: 2012-2017 Boomaga team https://github.com/Boomaga
* Authors:
* Alexander Sokoloff <[email protected]>
*
* This program or library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* END_COMMON_COPYRIGHT_HEADER */
#include <math.h>
#include <assert.h>
#include "pdfreader.h"
#include "pdfxref.h"
#include "pdfobject.h"
#include "pdferrors.h"
#include "pdfvalue.h"
#include <QFile>
#include <QTextCodec>
#include <QDebug>
namespace PDF {
struct ReaderData
{
public:
ReaderData(const char *buf, const quint64 size, QTextCodec *textCodec):
mData(buf),
mSize(size),
mTextCodec(textCodec)
{
}
bool isDelim(quint64 pos) const;
const char *mData;
const quint64 mSize;
QTextCodec *mTextCodec;
bool compareStr(quint64 pos, const char *str) const;
bool compareWord(quint64 pos, const char *str) const;
quint64 skipSpace(quint64 pos) const;
quint64 skipComment(quint64 pos) const;
qint64 skipCRLF(quint64 pos) const;
qint64 indexOf(const char *str, quint64 from) const;
qint64 indexOfBack(const char *str, quint64 from) const;
quint32 readUInt(quint64 *pos, bool *ok) const;
double readNum(quint64 *pos, bool *ok) const;
QString readNameString(quint64 *pos) const;
qint64 readHexString(quint64 start, String *res) const;
qint64 readLiteralString(qint64 start, String *res) const;
qint64 readArray(quint64 start, Array *res) const;
qint64 readDict(quint64 start, Dict *res) const;
Value readValue(quint64 *pos) const;
char operator[](quint64 index) const { return mData[index]; }
};
struct XRefStreamData
{
struct Section {
Section(PDF::ObjNum startObjNum = 0, quint32 count = 0):
startObjNum(startObjNum),
count(count)
{
}
PDF::ObjNum startObjNum;
quint32 count;
};
XRefStreamData(const char *buf, const quint64 size, const Dict &dict);
quint64 readSection(quint64 pos, Section section, XRefTable *res);
QVector<Section> §ions() {return mSections; }
private:
inline quint64 readField(qint64 pos, int len) const;
const char *mData;
const quint64 mSize;
int mField1;
int mField2;
int mField3;
int mEntryLen;
QVector<Section> mSections;
};
class Reader::Cache{
public:
Cache();
~Cache();
const QByteArray getStream(PDF::ObjNum objNum, PDF::GenNum genNum) const;
void setStream(PDF::ObjNum objNum, PDF::GenNum genNum, QByteArray stream);
void clear();
private:
QHash<quint64, QByteArray> mStreams;
};
} // namespace PDF
using namespace PDF;
/************************************************
*
************************************************/
Reader::Cache::Cache()
{
}
/************************************************
*
************************************************/
Reader::Cache::~Cache()
{
}
/************************************************
*
************************************************/
const QByteArray Reader::Cache::getStream(PDF::ObjNum objNum, PDF::GenNum genNum) const
{
return mStreams.value((quint64(objNum) << 32) + genNum);
}
/************************************************
*
************************************************/
void Reader::Cache::setStream(ObjNum objNum, GenNum genNum, QByteArray stream)
{
mStreams.insert((quint64(objNum) << 32) + genNum, stream);
}
/************************************************
*
************************************************/
void Reader::Cache::clear()
{
mStreams.clear();
}
/************************************************
*
************************************************/
XRefStreamData::XRefStreamData(const char *buf, const quint64 size, const Dict &dict):
mData(buf),
mSize(size),
mField1(0),
mField2(0),
mField3(0),
mEntryLen(0)
{
Q_UNUSED(mSize)
// W - An array of integers representing the size of the fields in a
// single cross-reference entry.
const Array &w = dict.value("W").asArray();
if (!w.isValid())
throw ReaderError("Incorrect XRef stream dictionary", 0);
if (w.count()<3)
throw ReaderError("Incorrect XRef stream dictionary", 0);
for (int i=0; i<w.count(); ++i)
mEntryLen += w.at(i).asNumber().value();
mField1 = w.at(0).asNumber();
mField2 = w.at(1).asNumber();
mField3 = w.at(2).asNumber();
if (!mEntryLen)
throw ReaderError("Incorrect XRef stream dictionary", 0);
// Index - An array containing a pair of integers for each subsection in
// this section. The first integer is the first object number in the
// subsection; the second integer is the number of entries in the subsection
PDF::Array index = dict.value("Index").asArray();
for (int s=0; s<index.count(); s+=2)
{
mSections << Section(
index.at(s).asNumber(),
index.at(s+1).asNumber());
}
// Default value: [0 Size].
if (mSections.count() == 0)
mSections << Section(
0,
dict.value("Size").asNumber());
}
/************************************************
*
************************************************/
quint64 XRefStreamData::readSection(quint64 pos, XRefStreamData::Section section, XRefTable *res)
{
quint64 end = section.count * mEntryLen;
PDF::ObjNum objNum = section.startObjNum;
for (; pos<end; pos+=mEntryLen)
{
int type = (mField1) ? readField(pos, mField1) : 1;
switch (type)
{
// Type 0 entries define the linked list of free objects
// field 2 - The object number of the next free object.
// field 3 - The generation number.
case 0:
res->addFreeObject(objNum,
readField(pos + mField1 + mField2, mField3),
readField(pos + mField1, mField2));
break;
// Type 1 entries define objects that are in use but are not compressed
// field 2 - The byte offset of the object
// field 3 - The generation number of the object.
case 1:
res->addUsedObject(objNum,
readField(pos + mField1 + mField2, mField3),
readField(pos + mField1, mField2));
break;
// Type 2 entries define compressed objects.
// field 2 - The object number of the object stream.
// field 3 - The index of this object within the object stream.
case 2:
res->addCompressedObject(objNum,
readField(pos + mField1, mField2),
readField(pos + mField1 + mField2, mField3));
break;
}
++objNum;
}
return end;
}
/************************************************
*
************************************************/
quint64 XRefStreamData::readField(qint64 pos, int len) const
{
quint64 res = 0;
for (int i=0; i<len; ++i)
res = (res << 8) + uchar(mData[pos++]);
return res;
}
/************************************************
*
************************************************/
bool ReaderData::isDelim(quint64 pos) const
{
return isspace(mData[pos]) ||
strchr("()<>[]{}/%", mData[pos]);
}
/************************************************
*
************************************************/
bool ReaderData::compareStr(quint64 pos, const char *str) const
{
size_t len = strlen(str);
return (mSize - pos > len) && strncmp(mData + pos, str, len) == 0;
}
/************************************************
*
************************************************/
bool ReaderData::compareWord(quint64 pos, const char *str) const
{
size_t len = strlen(str);
return (mSize - pos > len + 1) &&
strncmp(mData + pos, str, len) == 0 &&
isDelim(pos + len);
}
/************************************************
*
************************************************/
quint64 ReaderData::skipSpace(quint64 pos) const
{
while (pos < mSize)
{
while (pos < mSize && isspace(mData[pos]))
pos++;
if (mData[pos] != '%')
return pos;
pos = skipComment(pos);
}
return pos;
}
/************************************************
*
************************************************/
quint64 ReaderData::skipComment(quint64 pos) const
{
while (pos < mSize && mData[pos] != '\n' && mData[pos] != '\r')
++pos;
return pos;
}
/************************************************
*
************************************************/
qint64 ReaderData::skipCRLF(quint64 pos) const
{
while (pos < mSize && (mData[pos] == '\n' || mData[pos] == '\r'))
pos++;
return pos;
}
/************************************************
*
************************************************/
qint64 ReaderData::indexOf(const char *str, quint64 from) const
{
size_t len = strlen(str);
for (quint64 i = from; i<mSize-len; i++)
{
if (strncmp(mData + i, str, len) == 0)
return i;
}
return -1;
}
/************************************************
*
************************************************/
qint64 ReaderData::indexOfBack(const char *str, quint64 from) const
{
size_t len = strlen(str);
for (quint64 i = from - len + 1 ; i>0; i--)
{
if (strncmp(mData + i, str, len) == 0)
return i;
}
return -1;
}
/************************************************
*
************************************************/
quint32 ReaderData::readUInt(quint64 *pos, bool *ok) const
{
char *end;
quint32 res = strtoul(mData + *pos, &end, 10);
*ok = end != mData + *pos;
*pos = end - mData;
return res;
}
/************************************************
*
************************************************/
double ReaderData::readNum(quint64 *pos, bool *ok) const
{
const char * str = mData + *pos;
int sign = 1;
if (str[0] == '-')
{
++str;
sign = -1;
}
char *end;
double res = strtoll(str, &end, 10);
if (end[0] == '.')
{
++end;
if (isdigit(end[0]))
{
str = end;
long long fract = strtoll(str, &end, 10);
if (str < end)
res += fract / pow(10.0, end - str);
}
}
*ok = end != mData + *pos;
*pos = end - mData;
return res * sign;
}
/************************************************
*
************************************************/
QString ReaderData::readNameString(quint64 *pos) const
{
if (mData[*pos] != '/')
throw ReaderError("Invalid PDF name, starting marker '/' was not found", *pos);
quint64 start = *pos;
for (++(*pos); *pos < mSize; ++(*pos))
{
if (isDelim(*pos))
{
return QString::fromLocal8Bit(mData + start + 1, *pos - start - 1);
}
}
throw ReaderError("Invalid PDF name on pos", start);
}
/************************************************
* Strings may be written in hexadecimal form, which is useful for
* including arbitrary binary data in a PDF file. A hexadecimal
* string is written as a sequence of hexadecimal digits (0–9 and
* either A –F or a–f ) enclosed within angle brackets (< and >):
* < 4E6F762073686D6F7A206B6120706F702E >
*
* Each pair of hexadecimal digits defines one byte of the string.
* White-space characters (such as space, tab, carriage return,
* line feed, and form feed) are ignored.
*
* If the final digit of a hexadecimal string is missing—that is,
* if there is an odd number of digits—the final digit is assumed
* to be 0. For example:
* < 901FA3 >
* is a 3-byte string consisting of the characters whose hexadecimal
* codes are 90, 1F, and A3, but
* < 901FA >
* is a 3-byte string containing the characters whose hexadecimal
* codes are 90, 1F , and A0.
************************************************/
qint64 ReaderData::readHexString(quint64 start, String *res) const
{
QByteArray string;
string.reserve(1024);
bool first = true;
char r = 0;
for (quint64 pos = start+1; pos < mSize; ++pos)
{
char c = mData[pos];
switch (c)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
if (first)
r = c - '0';
else
string.append(r * 16 + c -'0');
first = !first;
break;
}
case 'A': case 'B': case 'C':
case 'D': case 'E': case 'F':
{
if (first)
r = c - 'A' + 10;
else
string.append(r * 16 + c -'A' + 10);
first = !first;
break;
}
case 'a': case 'b': case 'c':
case 'd': case 'e': case 'f':
{
if (first)
r = c - 'a' + 10;
else
string.append(r * 16 + c -'a' + 10);
first = !first;
break;
}
case ' ': case '\t': case '\n':
case '\v': case '\f': case '\r':
break;
case '>':
{
if (!first)
string.append(r * 16);
res->setValue(QTextCodec::codecForUtfText(string, mTextCodec)->toUnicode(string));
res->setEncodingType(String::HexEncoded);
return pos + 1;
}
default:
throw ReaderError("Invalid PDF hexadecimal string.", pos);
}
}
throw ReaderError("The closing hexadecimal string marker '>' was not found.", start);
}
/************************************************
* Literal Strings
*
* A literal string is written as an arbitrary number of characters enclosed
* in parentheses. Any characters may appear in a string except unbalanced
* parentheses and the backslash, which must be treated specially.
* Balanced pairs of parentheses within a string require no special treatment.
*
* The following are valid literal strings:
* ( This is a string )
* ( Strings may contain newlines
* and such. )
* ( Strings may contain balanced parentheses ( ) and
* special characters ( * ! & } ^ % and so on ) . )
* ( The following is an empty string . )
* ( )
* ( It has zero ( 0 ) length . )
*
* Within a literal string, the backslash (\) is used as an escape character
* for various purposes, such as to include newline characters, nonprinting
* ASCII characters, unbalanced parentheses, or the backslash character
* itself in the string. The character immediately following the backslash
* determines its precise interpretation (see Table 3.2). If the character
* following the backslash is not one of those shown in the table, the
* backslash is ignored.
*
* SEQUENCE MEANING
* \n Line feed (LF)
* \r Carriage return (CR)
* \t Horizontal tab (HT)
* \b Backspace (BS)
* \f Form feed (FF)
* \( Left parenthesis
* \) Right parenthesis
* \\ Backslash
* \ddd Character code ddd (octal)
*
* If a string is too long to be conveniently placed on a single line,
* it may be split across multiple lines by using the backslash character at
* the end of a line to indicate that the string continues on the following
* line. The backslash and the end-of-line marker following it are not
* considered part of the string. For example:
* ( These \
* two strings \
* are the same . )
* ( These two strings are the same . )
*
* If an end-of-line marker appears within a literal string without a
* preceding backslash, the result is equivalent to \n (regardless of
* whether the end-of-line marker was a carriage return, a line feed,
* or both). For example:
* ( This string has an end−of−line at the end of it .
* )
* ( So does this one .\n )
*
* The \ddd escape sequence provides a way to represent characters outside
* the printable ASCII character set. For example:
* ( This string contains \245two octal characters\307 . )
* The number ddd may consist of one, two, or three octal digits, with
* high-order overflow ignored. It is required that three octal digits be
* used, with leading zeros as needed, if the next character of the string
* is also a digit. For example, the literal
* ( \0053 )
* denotes a string containing two characters, \005 (Control-E) followed
* by the digit 3, whereas both
* ( \053 )
* and
* ( \53 )
* denote strings containing the single character \053, a plus sign (+).
************************************************/
qint64 ReaderData::readLiteralString(qint64 start, String *res) const
{
QByteArray data;
data.reserve(1024);
int level = 1;
bool esc = false;
for (quint64 i = start+1; i < mSize; ++i)
{
char c = mData[i];
switch (c)
{
// Backslash .......................
case '\\':
esc = !esc;
if (!esc)
data.append(c);
break;
// Line feed (LF) ..................
case 'n':
data.append(esc ? '\n' : 'n');
esc = false;
break;
// Carriage return (CR) ............
case 'r':
data.append(esc ? '\r' : 'r');
esc = false;
break;
// Horizontal tab (HT) .............
case 't':
data.append(esc ? '\t' : 't');
esc = false;
break;
// Backspace (BS) ..................
case 'b':
data.append(esc ? '\b' : 'b');
esc = false;
break;
// Form feed (FF) ..................
case 'f':
data.append(esc ? '\f' : 'f');
esc = false;
break;
// Character code ddd (octal) ......
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
if (esc)
{
esc = false;
char n = c-'0';
uint l = qMin(i+3, mSize);
for(++i; i<l; ++i)
{
c = mData[i];
if (c < '0' || c > '7' )
break;
n = n * 8 + c - '0';
}
data.append(n);
--i;
}
else
{
data.append(c);
}
break;
case '\n':
if (esc)
{
if (i+1<mSize && mData[i+1] == '\r')
++i;
}
else
{
data.append('\n');
}
esc = false;
break;
case '\r':
if (esc)
{
if (i+1<mSize && mData[i+1] == '\n')
++i;
}
else
{
data.append('\r');
}
esc = false;
break;
case '(':
if (!esc)
++level;
data.append(c);
esc = false;
break;
case ')':
if (!esc)
{
--level;
if (level == 0)
{
res->setValue(QTextCodec::codecForUtfText(data, mTextCodec)->toUnicode(data));
res->setEncodingType(String::LiteralEncoded);
return i + 1;
}
}
esc = false;
data.append(c);
break;
default:
esc = false;
data.append(c);
break;
}
}
throw ReaderError("The closing literal string marker ')' was not found.", start);
}
/************************************************
*
************************************************/
qint64 ReaderData::readArray(quint64 start, Array *res) const
{
quint64 pos = skipSpace(start + 1);
while (pos < mSize)
{
if (mData[pos] == ']')
{
res->setValid(true);
return pos + 1;
}
res->append(readValue(&pos));
pos = skipSpace(pos);
}
throw ReaderError("The closing array marker ']' was not found.", start);
}
/************************************************
*
************************************************/
qint64 ReaderData::readDict(quint64 start, Dict *res) const
{
quint64 pos = skipSpace(start + 2); // skip "<<" mark
while (pos < mSize - 1)
{
if (mData[pos] == '>' &&
mData[pos + 1] == '>' )
{
res->setValid(true);
return pos += 2; // skip ">>" mark
}
QString name = readNameString(&pos);
pos = skipSpace(pos);
res->insert(name, readValue(&pos));
pos = skipSpace(pos);
}
throw ReaderError("The closing dictionary marker '>>' was not found.", start);
}
/************************************************
*
************************************************/
Value ReaderData::readValue(quint64 *pos) const
{
char c = mData[*pos];
switch (c) {
// Link or Number .................
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
{
bool ok;
double n1 = readNum(pos, &ok);
if (!ok)
throw ReaderError(QString("Unexpected symbol '%1', expected a number.").arg(mData[*pos]), *pos);
if (n1 != quint64(n1))
return Number(n1);
quint64 p = *pos;
p = skipSpace(p);
quint64 n2 = readUInt(&p, &ok);
if (!ok)
return Number(n1);
p = skipSpace(p);
if (mData[p] != 'R')
return Number(n1);
*pos = p+1;
return Link(n1, n2);
}
// Float number ...................
case '-':
case '+':
case '.':
{
bool ok;
double n = readNum(pos, &ok);
if (!ok)
throw ReaderError(QString("Unexpected symbol '%1', expected a number.").arg(mData[*pos]), *pos);
return Number(n);
}
// Array ..........................
case '[':
{
Array res;
*pos = readArray(*pos, &res);
return res;
}
// Dict or HexString ..............
case '<':
{
if (mData[*pos+1] == '<')
{
Dict res;
*pos = readDict(*pos, &res);
return res;
}
else
{
String res;
*pos = readHexString(*pos, &res);
return res;
}
}
// Name ...........................
case '/':
{
return Name(readNameString(pos));
}
//LiteralString ...................
case '(':
{
String res;
*pos = readLiteralString(*pos, &res);
return res;
}
// Bool ...........................
case 't':
case 'f':
{
if (compareWord(*pos, "true"))
{
*pos += 4;
return Bool(true);
}
if (compareWord(*pos, "false"))
{
*pos += 5;
return Bool(false);
}
throw ReaderError(QString("Unexpected symbol '%1', expected a boolean.").arg(mData[*pos]), *pos);
}
// None ...........................
case 'n':
{
if (!compareWord(*pos, "null"))
throw ReaderError("Invalid PDF null", *pos);
*pos += 4;
return Null();
}
// Comment ........................
case '%':
{
while (*pos < mSize && mData[*pos] != '\n' && mData[*pos] != '\r')
++(*pos);
*pos = skipSpace(*pos);
return readValue(pos);
}
}
QByteArray d(mData + *pos, qMin(mSize - *pos, 20ull));
throw ReaderError(QString("Unknown object type '%1'").arg(d.data()), *pos);
}
/************************************************
*
************************************************/
Reader::Reader():
mFile(nullptr),
mData(nullptr),
mSize(0),
mPagesCount(-1),
mTextCodec(QTextCodec::codecForName("UTF-8")),
mCache(new Cache())
{
}
/************************************************
*
************************************************/
Reader::~Reader()
{
close();
delete mFile;
delete mCache;
}
/************************************************
*
************************************************/
Value Reader::readValue(quint64 *pos) const
{
return ReaderData(mData, mSize, mTextCodec).readValue(pos);
}
/************************************************
*
************************************************/
qint64 Reader::readObject(quint64 start, Object *res) const
{
ReaderData data(mData, mSize, mTextCodec);
quint64 pos = start;
bool ok;
res->setObjNum(data.readUInt(&pos, &ok));
if (!ok)