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qpdf/libqpdf/Pl_ASCIIHexDecoder.cc
Jay Berkenbilt 5d4cad9c02 ABI change: fix use of off_t, size_t, and integer types
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.
2012-06-20 15:20:26 -04:00

110 lines
1.8 KiB
C++

#include <qpdf/Pl_ASCIIHexDecoder.hh>
#include <qpdf/QTC.hh>
#include <stdexcept>
#include <string.h>
#include <ctype.h>
Pl_ASCIIHexDecoder::Pl_ASCIIHexDecoder(char const* identifier, Pipeline* next) :
Pipeline(identifier, next),
pos(0),
eod(false)
{
strcpy(this->inbuf, "00");
}
Pl_ASCIIHexDecoder::~Pl_ASCIIHexDecoder()
{
}
void
Pl_ASCIIHexDecoder::write(unsigned char* buf, size_t len)
{
if (this->eod)
{
return;
}
for (size_t i = 0; i < len; ++i)
{
char ch = toupper(buf[i]);
switch (ch)
{
case ' ':
case '\f':
case '\v':
case '\t':
case '\r':
case '\n':
QTC::TC("libtests", "Pl_ASCIIHexDecoder ignore space");
// ignore whitespace
break;
case '>':
this->eod = true;
flush();
break;
default:
if (((ch >= '0') && (ch <= '9')) ||
((ch >= 'A') && (ch <= 'F')))
{
this->inbuf[this->pos++] = ch;
if (this->pos == 2)
{
flush();
}
}
else
{
char t[2];
t[0] = ch;
t[1] = 0;
throw std::runtime_error(
std::string("character out of range"
" during base Hex decode: ") + t);
}
break;
}
if (this->eod)
{
break;
}
}
}
void
Pl_ASCIIHexDecoder::flush()
{
if (this->pos == 0)
{
QTC::TC("libtests", "Pl_ASCIIHexDecoder no-op flush");
return;
}
int b[2];
for (int i = 0; i < 2; ++i)
{
if (this->inbuf[i] >= 'A')
{
b[i] = this->inbuf[i] - 'A' + 10;
}
else
{
b[i] = this->inbuf[i] - '0';
}
}
unsigned char ch = (unsigned char)((b[0] << 4) + b[1]);
QTC::TC("libtests", "Pl_ASCIIHexDecoder partial flush",
(this->pos == 2) ? 0 : 1);
getNext()->write(&ch, 1);
this->pos = 0;
strcpy(this->inbuf, "00");
}
void
Pl_ASCIIHexDecoder::finish()
{
flush();
getNext()->finish();
}