FileInputSource.cc
3.16 KB
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#include <qpdf/FileInputSource.hh>
#include <string.h>
#include <qpdf/QUtil.hh>
#include <qpdf/QPDFExc.hh>
FileInputSource::FileInputSource() :
close_file(false),
file(0)
{
}
void
FileInputSource::setFilename(char const* filename)
{
destroy();
this->filename = filename;
this->close_file = true;
this->file = QUtil::fopen_wrapper(std::string("open ") + this->filename,
fopen(this->filename.c_str(), "rb"));
}
void
FileInputSource::setFile(
char const* description, FILE* filep, bool close_file)
{
destroy();
this->filename = description;
this->close_file = close_file;
this->file = filep;
this->seek(0, SEEK_SET);
}
FileInputSource::~FileInputSource()
{
destroy();
}
void
FileInputSource::destroy()
{
if (this->file && this->close_file)
{
fclose(this->file);
this->file = 0;
}
}
qpdf_offset_t
FileInputSource::findAndSkipNextEOL()
{
qpdf_offset_t result = 0;
bool done = false;
char buf[10240];
while (! done)
{
qpdf_offset_t cur_offset = QUtil::tell(this->file);
size_t len = this->read(buf, sizeof(buf));
if (len == 0)
{
done = true;
result = this->tell();
}
else
{
char* p1 = static_cast<char*>(memchr(buf, '\r', len));
char* p2 = static_cast<char*>(memchr(buf, '\n', len));
char* p = (p1 && p2) ? std::min(p1, p2) : p1 ? p1 : p2;
if (p)
{
result = cur_offset + (p - buf);
// We found \r or \n. Keep reading until we get past
// \r and \n characters.
this->seek(result + 1, SEEK_SET);
char ch;
while (! done)
{
if (this->read(&ch, 1) == 0)
{
done = true;
}
else if (! ((ch == '\r') || (ch == '\n')))
{
this->unreadCh(ch);
done = true;
}
}
}
}
}
return result;
}
std::string const&
FileInputSource::getName() const
{
return this->filename;
}
qpdf_offset_t
FileInputSource::tell()
{
return QUtil::tell(this->file);
}
void
FileInputSource::seek(qpdf_offset_t offset, int whence)
{
QUtil::os_wrapper(std::string("seek to ") + this->filename + ", offset " +
QUtil::int_to_string(offset) + " (" +
QUtil::int_to_string(whence) + ")",
QUtil::seek(this->file, offset, whence));
}
void
FileInputSource::rewind()
{
::rewind(this->file);
}
size_t
FileInputSource::read(char* buffer, size_t length)
{
this->last_offset = QUtil::tell(this->file);
size_t len = fread(buffer, 1, length, this->file);
if ((len == 0) && ferror(this->file))
{
throw QPDFExc(qpdf_e_system,
this->filename, "",
this->last_offset,
std::string("read ") +
QUtil::int_to_string(length) + " bytes");
}
return len;
}
void
FileInputSource::unreadCh(char ch)
{
QUtil::os_wrapper(this->filename + ": unread character",
ungetc(static_cast<unsigned char>(ch), this->file));
}