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#include "dl-loader.hh"
#include <errno.h>
#include <iostream>
using namespace DviLib;
/* Abstract loader */
/* =============== */
/* unsigned integers */
int
AbstractLoader::get_uint16 ()
{
return (get_uint8() << 8) | get_uint8();
}
int
AbstractLoader::get_uint24 ()
{
return (get_uint16() << 8) | get_uint8();
}
int
AbstractLoader::get_uint32 ()
{
return (get_uint16() << 16) | get_uint16();
}
/* signed integers */
int
AbstractLoader::get_int16 ()
{
return (get_int8() << 8) | get_uint8();
}
int
AbstractLoader::get_int24 ()
{
return (get_int16() << 8) | get_uint8();
}
int
AbstractLoader::get_int32 ()
{
return (get_int16() << 16) | get_uint16();
}
/* (Pascal) strings */
string
AbstractLoader::get_string8 ()
{
return get_n (get_uint8());
}
string
AbstractLoader::get_string16 ()
{
return get_n (get_uint16());
}
string
AbstractLoader::get_string24 ()
{
return get_n (get_uint24());
}
string
AbstractLoader::get_string32 ()
{
return get_n (get_uint32());
}
void
AbstractLoader::skip_string8 ()
{
get_string8();
}
void
AbstractLoader::skip_string16 ()
{
get_string16();
}
void
AbstractLoader::skip_string24 ()
{
get_string24();
}
void
AbstractLoader::skip_string32 ()
{
get_string32();
}
/* "n" */
void
AbstractLoader::skip_n (int n)
{
get_n(n);
}
string
AbstractLoader::get_n (int n)
{
string r;
while (n--)
r += get_uint8 ();
return r;
}
void
AbstractLoader::get_n (int n, unsigned char *v)
{
while (n--)
*v++ = (unsigned char)get_uint8 ();
}
/* File loader */
/* FIXME
*
* do not use C style files (?)
* what exceptions should we throw?
*/
FileLoader::FileLoader (const string &name)
{
filename = name;
f = fopen (filename.c_str(), "r");
if (!f)
{
string s (strerror (errno));
throw string ("Could not open " + filename + ": " + s);
}
}
FileLoader::~FileLoader ()
{
std::cout << "hej" << std::endl;
if (fclose (f) == EOF)
throw string ("Error closing " + filename);
}
int
FileLoader::get_int8 ()
{
int c;
if ((c = fgetc (f)) == EOF)
throw string ("Unexpected end of file");
else
return (signed char)c;
}
int
FileLoader::get_uint8 ()
{
return (unsigned char)get_int8();
}
void
FileLoader::goto_from_start (int n)
{
if (fseek (f, n, SEEK_SET) < 0)
{
string error = "fseek failed: ";
error += strerror (errno);
throw error;
}
}
void
FileLoader::goto_from_current (int n)
{
if (fseek (f, n, SEEK_CUR) < 0)
{
string error = "fseek failed: ";
error += strerror (errno);
throw error;
}
}
void
FileLoader::goto_from_end (int n)
{
if (fseek (f, n, SEEK_END) < 0)
{
string error = "fseek failed: ";
error += strerror (errno);
throw error;
}
}
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