Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity	Unique Reachable Complexities	Unique Reachable Functions	All non-covered Complexity	All Reachable Complexity	Function Name	Function Callsite	Blocked Branch
8	8	4 : View List ['__cxa_throw', '__cxa_allocate_exception', 'std::runtime_error::runtime_error(char const*)', '__cxa_free_exception']	8	8	Pl_LZWDecoder::getFirstChar(unsignedint)	call site: 00000	/src/qpdf/libqpdf/Pl_LZWDecoder.cc:86
8	8	4 : View List ['__cxa_throw', '__cxa_allocate_exception', 'std::runtime_error::runtime_error(char const*)', '__cxa_free_exception']	8	8	Pl_LZWDecoder::addToTable(unsignedchar)	call site: 00000	/src/qpdf/libqpdf/Pl_LZWDecoder.cc:111
0	0	None	0	0	Buffer::Members::Members(unsignedlong,unsignedchar*,bool)	call site: 00000	/src/qpdf/libqpdf/Buffer.cc:30
0	0	None	0	0	Pl_LZWDecoder::Pl_LZWDecoder(charconst,Pipeline,bool)	call site: 00000	/src/qpdf/libqpdf/Pl_LZWDecoder.cc:13

Fuzzer calltree


         LLVMFuzzerTestOneInput

[function] [call site] 00000


           FuzzHelper::FuzzHelper(unsigned char const*, unsigned long)

[function] [call site] 00001


           FuzzHelper::run()

[function] [call site] 00002


             FuzzHelper::doChecks()

[function] [call site] 00003


               Pl_Discard::Pl_Discard()

[function] [call site] 00004


                 Pipeline::Pipeline(char const*, Pipeline*)

[function] [call site] 00005


               Pl_LZWDecoder::Pl_LZWDecoder(char const*, Pipeline*, bool)

[function] [call site] 00006


                 Pipeline::Pipeline(char const*, Pipeline*)

[function] [call site] 00007


                 __cxa_allocate_exception

[call site] 00008


                 std::logic_error::logic_error(char const*)

[call site] 00009


                 __cxa_throw

[call site] 00010


                 __cxa_free_exception

[call site] 00011


                 Pipeline::~Pipeline()

[function] [call site] 00012


               Pl_LZWDecoder::write(unsigned char const*, unsigned long)

[function] [call site] 00013


                 Pl_LZWDecoder::sendNextCode()

[function] [call site] 00014


                   Pl_LZWDecoder::handleCode(unsigned int)

[function] [call site] 00015


                     QTC::TC(char const*, char const*, int)

[function] [call site] 00016


                     unsigned int QIntC::to_uint<unsigned long>(unsigned long const&)

[function] [call site] 00017


                       QIntC::IntConverter<unsigned long, unsigned int, false, false>::convert(unsigned long const&)

[function] [call site] 00018


                         QIntC::IntConverter<unsigned long, unsigned int, false, false>::error(unsigned long)

[function] [call site] 00019


                           __cxa_allocate_exception

[call site] 00020


                           std::__1::basic_ostringstream<char, std::__1::char_traits<char>, std::__1::allocator<char> >::str[abi:ne180100]() const &

[function] [call site] 00021


                             std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::str[abi:ne180100]() const &

[function] [call site] 00022


                           std::range_error::range_error[abi:ne180100](std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)

[function] [call site] 00023


                             std::runtime_error::runtime_error(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)

[call site] 00024


                           __cxa_throw

[call site] 00025


                           __cxa_free_exception

[call site] 00026


                     __cxa_allocate_exception

[call site] 00027


                     std::runtime_error::runtime_error(char const*)

[call site] 00028


                     __cxa_throw

[call site] 00029


                     std::runtime_error::~runtime_error()

[call site] 00030


                     __cxa_free_exception

[call site] 00031


                     QTC::TC(char const*, char const*, int)

[function] [call site] 00032


                     Pl_LZWDecoder::getFirstChar(unsigned int)

[function] [call site] 00033


                       __cxa_allocate_exception

[call site] 00034


                       std::runtime_error::runtime_error(char const*)

[call site] 00035


                       __cxa_throw

[call site] 00036


                       std::runtime_error::~runtime_error()

[call site] 00037


                       __cxa_free_exception

[call site] 00038


                       Buffer::getBuffer()

[function] [call site] 00039


                       __cxa_allocate_exception

[call site] 00040


                       std::runtime_error::runtime_error(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)

[call site] 00041


                       __cxa_throw

[call site] 00042


                       __cxa_free_exception

[call site] 00043


                     Pl_LZWDecoder::getFirstChar(unsigned int)

[function] [call site] 00044


                     __cxa_allocate_exception

[call site] 00045


                     std::runtime_error::runtime_error(char const*)

[call site] 00046


                     __cxa_throw

[call site] 00047


                     std::runtime_error::~runtime_error()

[call site] 00048


                     __cxa_free_exception

[call site] 00049


                     Pl_LZWDecoder::addToTable(unsigned char)

[function] [call site] 00050


                       __cxa_allocate_exception

[call site] 00051


                       std::runtime_error::runtime_error(char const*)

[call site] 00052


                       __cxa_throw

[call site] 00053


                       std::runtime_error::~runtime_error()

[call site] 00054


                       __cxa_free_exception

[call site] 00055


                       Buffer::getBuffer()

[function] [call site] 00056


                       Buffer::getSize() const

[function] [call site] 00057


                       unsigned int QIntC::to_uint<unsigned long>(unsigned long const&)

[function] [call site] 00058


                       __cxa_allocate_exception

[call site] 00059


                       std::runtime_error::runtime_error(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)

[call site] 00060


                       __cxa_throw

[call site] 00061


                       __cxa_free_exception

[call site] 00062


                       Buffer::Buffer(unsigned long)

[function] [call site] 00063


                         Buffer::Members::Members(unsigned long, unsigned char*, bool)

[function] [call site] 00064


                       Buffer::getBuffer()

[function] [call site] 00065


                       Buffer::~Buffer()

[function] [call site] 00066


                     Pipeline::next() const

[function] [call site] 00067


                     __cxa_allocate_exception

[call site] 00068


                     std::runtime_error::runtime_error(char const*)

[call site] 00069


                     __cxa_throw

[call site] 00070


                     std::runtime_error::~runtime_error()

[call site] 00071


                     __cxa_free_exception

[call site] 00072


                     Pipeline::next() const

[function] [call site] 00073


                     Buffer::getBuffer()

[function] [call site] 00074


                     Buffer::getSize() const

[function] [call site] 00075


               Pl_LZWDecoder::finish()

[function] [call site] 00076


                 Pipeline::next() const

[function] [call site] 00077


               Pl_LZWDecoder::~Pl_LZWDecoder()

[function] [call site] 00078


                 Pipeline::~Pipeline()

[function] [call site] 00079


               Pl_Discard::~Pl_Discard()

[function] [call site] 00080


                 Pipeline::~Pipeline()

[function] [call site] 00081


             __cxa_begin_catch

[call site] 00082


             __cxa_end_catch

[call site] 00083


             __clang_call_terminate

[call site] 00084


               __cxa_begin_catch

[call site] 00085