BufferInputSource.cc
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#include <qpdf/BufferInputSource.hh>
#include <qpdf/QIntC.hh>
#include <string.h>
#include <stdexcept>
#include <algorithm>
#include <limits>
#include <sstream>
BufferInputSource::Members::Members(bool own_memory,
std::string const& description,
Buffer* buf) :
own_memory(own_memory),
description(description),
buf(buf),
cur_offset(0),
max_offset(buf ? QIntC::to_offset(buf->getSize()) : 0)
{
}
BufferInputSource::Members::~Members()
{
}
BufferInputSource::BufferInputSource(std::string const& description,
Buffer* buf, bool own_memory) :
m(new Members(own_memory, description, buf))
{
}
BufferInputSource::BufferInputSource(std::string const& description,
std::string const& contents) :
m(new Members(true, description, 0))
{
this->m->buf = new Buffer(contents.length());
this->m->max_offset = QIntC::to_offset(this->m->buf->getSize());
unsigned char* bp = this->m->buf->getBuffer();
memcpy(bp, contents.c_str(), contents.length());
}
BufferInputSource::~BufferInputSource()
{
if (this->m->own_memory)
{
delete this->m->buf;
}
}
qpdf_offset_t
BufferInputSource::findAndSkipNextEOL()
{
if (this->m->cur_offset < 0)
{
throw std::logic_error("INTERNAL ERROR: BufferInputSource offset < 0");
}
qpdf_offset_t end_pos = this->m->max_offset;
if (this->m->cur_offset >= end_pos)
{
this->last_offset = end_pos;
this->m->cur_offset = end_pos;
return end_pos;
}
qpdf_offset_t result = 0;
unsigned char const* buffer = this->m->buf->getBuffer();
unsigned char const* end = buffer + end_pos;
unsigned char const* p = buffer + this->m->cur_offset;
while ((p < end) && !((*p == '\r') || (*p == '\n')))
{
++p;
}
if (p < end)
{
result = p - buffer;
this->m->cur_offset = result + 1;
++p;
while ((this->m->cur_offset < end_pos) &&
((*p == '\r') || (*p == '\n')))
{
++p;
++this->m->cur_offset;
}
}
else
{
this->m->cur_offset = end_pos;
result = end_pos;
}
return result;
}
std::string const&
BufferInputSource::getName() const
{
return this->m->description;
}
qpdf_offset_t
BufferInputSource::tell()
{
return this->m->cur_offset;
}
void
BufferInputSource::seek(qpdf_offset_t offset, int whence)
{
switch (whence)
{
case SEEK_SET:
this->m->cur_offset = offset;
break;
case SEEK_END:
QIntC::range_check(this->m->max_offset, offset);
this->m->cur_offset = this->m->max_offset + offset;
break;
case SEEK_CUR:
QIntC::range_check(this->m->cur_offset, offset);
this->m->cur_offset += offset;
break;
default:
throw std::logic_error(
"INTERNAL ERROR: invalid argument to BufferInputSource::seek");
break;
}
if (this->m->cur_offset < 0)
{
throw std::runtime_error(
this->m->description + ": seek before beginning of buffer");
}
}
void
BufferInputSource::rewind()
{
this->m->cur_offset = 0;
}
size_t
BufferInputSource::read(char* buffer, size_t length)
{
if (this->m->cur_offset < 0)
{
throw std::logic_error("INTERNAL ERROR: BufferInputSource offset < 0");
}
qpdf_offset_t end_pos = this->m->max_offset;
if (this->m->cur_offset >= end_pos)
{
this->last_offset = end_pos;
return 0;
}
this->last_offset = this->m->cur_offset;
size_t len = std::min(
QIntC::to_size(end_pos - this->m->cur_offset), length);
memcpy(buffer, this->m->buf->getBuffer() + this->m->cur_offset, len);
this->m->cur_offset += QIntC::to_offset(len);
return len;
}
void
BufferInputSource::unreadCh(char ch)
{
if (this->m->cur_offset > 0)
{
--this->m->cur_offset;
}
}