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#include <qpdf/BufferInputSource.hh>
#include <string.h>
#include <stdexcept>
#include <algorithm>
BufferInputSource::BufferInputSource(std::string const& description,
Buffer* buf, bool own_memory) :
own_memory(own_memory),
description(description),
buf(buf),
cur_offset(0)
{
}
BufferInputSource::BufferInputSource(std::string const& description,
std::string const& contents) :
own_memory(true),
description(description),
buf(0),
cur_offset(0)
{
this->buf = new Buffer(contents.length());
unsigned char* bp = buf->getBuffer();
memcpy(bp, contents.c_str(), contents.length());
}
BufferInputSource::~BufferInputSource()
{
if (own_memory)
{
delete this->buf;
}
}
qpdf_offset_t
BufferInputSource::findAndSkipNextEOL()
{
if (this->cur_offset < 0)
{
throw std::logic_error("INTERNAL ERROR: BufferInputSource offset < 0");
}
qpdf_offset_t end_pos = this->buf->getSize();
if (this->cur_offset >= end_pos)
{
this->last_offset = end_pos;
this->cur_offset = end_pos;
return end_pos;
}
qpdf_offset_t result = 0;
size_t len = end_pos - this->cur_offset;
unsigned char const* buffer = this->buf->getBuffer();
void* start = const_cast<unsigned char*>(buffer) + this->cur_offset;
unsigned char* p1 = static_cast<unsigned char*>(memchr(start, '\r', len));
unsigned char* p2 = static_cast<unsigned char*>(memchr(start, '\n', len));
unsigned char* p = (p1 && p2) ? std::min(p1, p2) : p1 ? p1 : p2;
if (p)
{
result = p - buffer;
this->cur_offset = result + 1;
++p;
while ((this->cur_offset < end_pos) &&
((*p == '\r') || (*p == '\n')))
{
++p;
++this->cur_offset;
}
}
else
{
this->cur_offset = end_pos;
result = end_pos;
}
return result;
}
std::string const&
BufferInputSource::getName() const
{
return this->description;
}
qpdf_offset_t
BufferInputSource::tell()
{
return this->cur_offset;
}
void
BufferInputSource::seek(qpdf_offset_t offset, int whence)
{
switch (whence)
{
case SEEK_SET:
this->cur_offset = offset;
break;
case SEEK_END:
this->cur_offset = this->buf->getSize() + offset;
break;
case SEEK_CUR:
this->cur_offset += offset;
break;
default:
throw std::logic_error(
"INTERNAL ERROR: invalid argument to BufferInputSource::seek");
break;
}
if (this->cur_offset < 0)
{
throw std::runtime_error(
this->description + ": seek before beginning of buffer");
}
}
void
BufferInputSource::rewind()
{
this->cur_offset = 0;
}
size_t
BufferInputSource::read(char* buffer, size_t length)
{
if (this->cur_offset < 0)
{
throw std::logic_error("INTERNAL ERROR: BufferInputSource offset < 0");
}
qpdf_offset_t end_pos = this->buf->getSize();
if (this->cur_offset >= end_pos)
{
this->last_offset = end_pos;
return 0;
}
this->last_offset = this->cur_offset;
size_t len = std::min(
static_cast<size_t>(end_pos - this->cur_offset), length);
memcpy(buffer, buf->getBuffer() + this->cur_offset, len);
this->cur_offset += len;
return len;
}
void
BufferInputSource::unreadCh(char ch)
{
if (this->cur_offset > 0)
{
--this->cur_offset;
}
}
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