Pl_ASCIIHexDecoder.cc
2.09 KB
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#include <qpdf/Pl_ASCIIHexDecoder.hh>
#include <qpdf/QTC.hh>
#include <cctype>
#include <stdexcept>
using namespace std::literals;
Pl_ASCIIHexDecoder::Pl_ASCIIHexDecoder(char const* identifier, Pipeline* next) :
Pipeline(identifier, next)
{
if (!next) {
throw std::logic_error("Attempt to create Pl_ASCIIHexDecoder with nullptr as next");
}
}
void
Pl_ASCIIHexDecoder::write(unsigned char const* buf, size_t len)
{
if (eod) {
return;
}
for (size_t i = 0; i < len; ++i) {
char ch = static_cast<char>(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 '>':
eod = true;
flush();
break;
default:
if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'F')) {
inbuf[pos++] = ch;
if (pos == 2) {
flush();
}
} else {
char t[2];
t[0] = ch;
t[1] = 0;
throw std::runtime_error("character out of range during base Hex decode: "s + t);
}
break;
}
if (eod) {
break;
}
}
}
void
Pl_ASCIIHexDecoder::flush()
{
if (pos == 0) {
QTC::TC("libtests", "Pl_ASCIIHexDecoder no-op flush");
return;
}
int b[2];
for (int i = 0; i < 2; ++i) {
if (inbuf[i] >= 'A') {
b[i] = inbuf[i] - 'A' + 10;
} else {
b[i] = inbuf[i] - '0';
}
}
auto ch = static_cast<unsigned char>((b[0] << 4) + b[1]);
QTC::TC("libtests", "Pl_ASCIIHexDecoder partial flush", (pos == 2) ? 0 : 1);
// Reset before calling getNext()->write in case that throws an exception.
pos = 0;
inbuf[0] = '0';
inbuf[1] = '0';
inbuf[2] = '\0';
next()->write(&ch, 1);
}
void
Pl_ASCIIHexDecoder::finish()
{
flush();
next()->finish();
}