mirror of
https://github.com/qpdf/qpdf.git
synced 2024-12-22 19:08:59 +00:00
5d4cad9c02
Significantly improve the code's use of off_t for file offsets, size_t for memory sizes, and integer types in cases where there has to be compatibility with external interfaces. Rework sections of the code that would have prevented qpdf from working on files larger than 2 (or maybe 4) GB in size.
132 lines
2.1 KiB
C++
132 lines
2.1 KiB
C++
#include <qpdf/Pl_ASCII85Decoder.hh>
|
|
#include <qpdf/QTC.hh>
|
|
#include <stdexcept>
|
|
#include <string.h>
|
|
|
|
Pl_ASCII85Decoder::Pl_ASCII85Decoder(char const* identifier, Pipeline* next) :
|
|
Pipeline(identifier, next),
|
|
pos(0),
|
|
eod(0)
|
|
{
|
|
memset(this->inbuf, 117, 5);
|
|
}
|
|
|
|
Pl_ASCII85Decoder::~Pl_ASCII85Decoder()
|
|
{
|
|
}
|
|
|
|
void
|
|
Pl_ASCII85Decoder::write(unsigned char* buf, size_t len)
|
|
{
|
|
if (eod > 1)
|
|
{
|
|
return;
|
|
}
|
|
for (size_t i = 0; i < len; ++i)
|
|
{
|
|
if (eod > 1)
|
|
{
|
|
break;
|
|
}
|
|
else if (eod == 1)
|
|
{
|
|
if (buf[i] == '>')
|
|
{
|
|
flush();
|
|
eod = 2;
|
|
}
|
|
else
|
|
{
|
|
throw std::runtime_error(
|
|
"broken end-of-data sequence in base 85 data");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
switch (buf[i])
|
|
{
|
|
case ' ':
|
|
case '\f':
|
|
case '\v':
|
|
case '\t':
|
|
case '\r':
|
|
case '\n':
|
|
QTC::TC("libtests", "Pl_ASCII85Decoder ignore space");
|
|
// ignore whitespace
|
|
break;
|
|
|
|
case '~':
|
|
eod = 1;
|
|
break;
|
|
|
|
case 'z':
|
|
if (pos != 0)
|
|
{
|
|
throw std::runtime_error(
|
|
"unexpected z during base 85 decode");
|
|
}
|
|
else
|
|
{
|
|
QTC::TC("libtests", "Pl_ASCII85Decoder read z");
|
|
getNext()->write((unsigned char*)"\000\000\000\000", 4);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
if ((buf[i] < 33) || (buf[i] > 117))
|
|
{
|
|
throw std::runtime_error(
|
|
"character out of range during base 85 decode");
|
|
}
|
|
else
|
|
{
|
|
this->inbuf[this->pos++] = buf[i];
|
|
if (pos == 5)
|
|
{
|
|
flush();
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
Pl_ASCII85Decoder::flush()
|
|
{
|
|
if (this->pos == 0)
|
|
{
|
|
QTC::TC("libtests", "Pl_ASCII85Decoder no-op flush");
|
|
return;
|
|
}
|
|
unsigned long lval = 0;
|
|
for (int i = 0; i < 5; ++i)
|
|
{
|
|
lval *= 85;
|
|
lval += (this->inbuf[i] - 33);
|
|
}
|
|
|
|
unsigned char outbuf[4];
|
|
memset(outbuf, 0, 4);
|
|
for (int i = 3; i >= 0; --i)
|
|
{
|
|
outbuf[i] = lval & 0xff;
|
|
lval >>= 8;
|
|
}
|
|
|
|
QTC::TC("libtests", "Pl_ASCII85Decoder partial flush",
|
|
(this->pos == 5) ? 0 : 1);
|
|
getNext()->write(outbuf, this->pos - 1);
|
|
|
|
this->pos = 0;
|
|
memset(this->inbuf, 117, 5);
|
|
}
|
|
|
|
void
|
|
Pl_ASCII85Decoder::finish()
|
|
{
|
|
flush();
|
|
getNext()->finish();
|
|
}
|