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/* $Id$ */
/*
libg3d - 3D object loading library
Copyright (C) 2005-2009 Markus Dahms <mad@automagically.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <g3d/types.h>
gint32 g3d_read_int8(FILE *f)
{
int c = fgetc(f);
if(c == EOF)
return 0;
else
return c;
}
gint32 g3d_read_int16_be(FILE *f)
{
return (g3d_read_int8(f)<<8) | g3d_read_int8(f);
}
gint32 g3d_read_int16_le(FILE *f)
{
return g3d_read_int8(f) | (g3d_read_int8(f)<<8);
}
gint32 g3d_read_int32_be(FILE *f)
{
return (g3d_read_int8(f) << 24) | (g3d_read_int8(f) << 16) |
(g3d_read_int8(f) << 8) | g3d_read_int8(f);
}
gint32 g3d_read_int32_le(FILE *f)
{
return g3d_read_int8(f) | (g3d_read_int8(f) << 8) |
(g3d_read_int8(f) << 16) | (g3d_read_int8(f) << 24);
}
static void g3d_read_bytes(FILE *f, guint8 *buf, gsize n)
{
gint32 i;
for(i = 0; i < n; i ++)
buf[i] = g3d_read_int8(f);
}
static void g3d_read_bytes_swap(FILE *f, guint8 *buf, gsize n)
{
gint32 i;
for(i = (n - 1); i >= 0; i --)
buf[i] = g3d_read_int8(f);
}
G3DFloat g3d_read_float_be(FILE *f)
{
union {
G3DFloat f;
guint8 u[4];
} u;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
g3d_read_bytes_swap(f, u.u, 4);
#elif G_BYTE_ORDER == G_BIG_ENDIAN
g3d_read_bytes(f, u.u, 4);
#endif
return u.f;
}
G3DFloat g3d_read_float_le(FILE *f)
{
union {
G3DFloat f;
guint8 u[4];
} u;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
g3d_read_bytes(f, u.u, 4);
#elif G_BYTE_ORDER == G_BIG_ENDIAN
g3d_read_bytes_swap(f, u.u, 4);
#endif
return u.f;
}
G3DDouble g3d_read_double_be(FILE *f)
{
union {
G3DDouble d;
guint8 u[8];
} u;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
g3d_read_bytes_swap(f, u.u, 8);
#elif G_BYTE_ORDER == G_BIG_ENDIAN
g3d_read_bytes(f, u.u, 8);
#endif
return u.d;
}
G3DDouble g3d_read_double_le(FILE *f)
{
union {
G3DDouble d;
guint8 u[8];
} u;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
g3d_read_bytes(f, u.u, 8);
#elif G_BYTE_ORDER == G_BIG_ENDIAN
g3d_read_bytes_swap(f, u.u, 8);
#endif
return u.d;
}
gint32 g3d_read_cstr(FILE *f, gchar *buffer, gint32 max_len)
{
gint32 n = 0;
gchar c;
do
{
c = g3d_read_int8(f);
buffer[n] = c;
n ++;
}
while((c != 0) && (n < max_len));
buffer[max_len - 1] = '\0';
return n;
}
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