diff options
Diffstat (limited to 'libqpdf/Pl_RunLength.cc')
| -rw-r--r-- | libqpdf/Pl_RunLength.cc | 97 |
1 files changed, 53 insertions, 44 deletions
diff --git a/libqpdf/Pl_RunLength.cc b/libqpdf/Pl_RunLength.cc index 3e3abd98..ed3b7576 100644 --- a/libqpdf/Pl_RunLength.cc +++ b/libqpdf/Pl_RunLength.cc @@ -3,15 +3,24 @@ #include <qpdf/QUtil.hh> #include <qpdf/QTC.hh> -Pl_RunLength::Pl_RunLength(char const* identifier, Pipeline* next, - action_e action) : - Pipeline(identifier, next), +Pl_RunLength::Members::Members(action_e action) : action(action), state(st_top), length(0) { } +Pl_RunLength::Members::~Members() +{ +} + +Pl_RunLength::Pl_RunLength(char const* identifier, Pipeline* next, + action_e action) : + Pipeline(identifier, next), + m(new Members(action)) +{ +} + Pl_RunLength::~Pl_RunLength() { } @@ -19,7 +28,7 @@ Pl_RunLength::~Pl_RunLength() void Pl_RunLength::write(unsigned char* data, size_t len) { - if (this->action == a_encode) + if (this->m->action == a_encode) { encode(data, len); } @@ -34,41 +43,41 @@ Pl_RunLength::encode(unsigned char* data, size_t len) { for (size_t i = 0; i < len; ++i) { - if ((this->state == st_top) != (this->length <= 1)) + if ((this->m->state == st_top) != (this->m->length <= 1)) { throw std::logic_error( "Pl_RunLength::encode: state/length inconsistency"); } unsigned char ch = data[i]; - if ((this->length > 0) && - ((this->state == st_copying) || (this->length < 128)) && - (ch == this->buf[this->length-1])) + if ((this->m->length > 0) && + ((this->m->state == st_copying) || (this->m->length < 128)) && + (ch == this->m->buf[this->m->length-1])) { QTC::TC("libtests", "Pl_RunLength: switch to run", - (this->length == 128) ? 0 : 1); - if (this->state == st_copying) + (this->m->length == 128) ? 0 : 1); + if (this->m->state == st_copying) { - --this->length; + --this->m->length; flush_encode(); - this->buf[0] = ch; - this->length = 1; + this->m->buf[0] = ch; + this->m->length = 1; } - this->state = st_run; - this->buf[this->length] = ch; - ++this->length; + this->m->state = st_run; + this->m->buf[this->m->length] = ch; + ++this->m->length; } else { - if ((this->length == 128) || (this->state == st_run)) + if ((this->m->length == 128) || (this->m->state == st_run)) { flush_encode(); } - else if (this->length > 0) + else if (this->m->length > 0) { - this->state = st_copying; + this->m->state = st_copying; } - this->buf[this->length] = ch; - ++this->length; + this->m->buf[this->m->length] = ch; + ++this->m->length; } } } @@ -79,20 +88,20 @@ Pl_RunLength::decode(unsigned char* data, size_t len) for (size_t i = 0; i < len; ++i) { unsigned char ch = data[i]; - switch (this->state) + switch (this->m->state) { case st_top: if (ch < 128) { // length represents remaining number of bytes to copy - this->length = 1U + ch; - this->state = st_copying; + this->m->length = 1U + ch; + this->m->state = st_copying; } else if (ch > 128) { // length represents number of copies of next byte - this->length = 257U - ch; - this->state = st_run; + this->m->length = 257U - ch; + this->m->state = st_run; } else // ch == 128 { @@ -102,18 +111,18 @@ Pl_RunLength::decode(unsigned char* data, size_t len) case st_copying: this->getNext()->write(&ch, 1); - if (--this->length == 0) + if (--this->m->length == 0) { - this->state = st_top; + this->m->state = st_top; } break; case st_run: - for (unsigned int j = 0; j < this->length; ++j) + for (unsigned int j = 0; j < this->m->length; ++j) { this->getNext()->write(&ch, 1); } - this->state = st_top; + this->m->state = st_top; break; } } @@ -122,36 +131,36 @@ Pl_RunLength::decode(unsigned char* data, size_t len) void Pl_RunLength::flush_encode() { - if (this->length == 128) + if (this->m->length == 128) { QTC::TC("libtests", "Pl_RunLength flush full buffer", - (this->state == st_copying ? 0 : - this->state == st_run ? 1 : + (this->m->state == st_copying ? 0 : + this->m->state == st_run ? 1 : -1)); } - if (this->length == 0) + if (this->m->length == 0) { QTC::TC("libtests", "Pl_RunLength flush empty buffer"); } - if (this->state == st_run) + if (this->m->state == st_run) { - if ((this->length < 2) || (this->length > 128)) + if ((this->m->length < 2) || (this->m->length > 128)) { throw std::logic_error( "Pl_RunLength: invalid length in flush_encode for run"); } - unsigned char ch = static_cast<unsigned char>(257 - this->length); + unsigned char ch = static_cast<unsigned char>(257 - this->m->length); this->getNext()->write(&ch, 1); - this->getNext()->write(&this->buf[0], 1); + this->getNext()->write(&this->m->buf[0], 1); } - else if (this->length > 0) + else if (this->m->length > 0) { - unsigned char ch = static_cast<unsigned char>(this->length - 1); + unsigned char ch = static_cast<unsigned char>(this->m->length - 1); this->getNext()->write(&ch, 1); - this->getNext()->write(this->buf, this->length); + this->getNext()->write(this->m->buf, this->m->length); } - this->state = st_top; - this->length = 0; + this->m->state = st_top; + this->m->length = 0; } void @@ -161,7 +170,7 @@ Pl_RunLength::finish() // data, which means the stream was terminated early, but we will // just ignore this case since this is the only sensible thing to // do. - if (this->action == a_encode) + if (this->m->action == a_encode) { flush_encode(); unsigned char ch = 128; |