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/* $XFree86: xc/programs/Xserver/hw/xfree86/ddc/interpret_vdif.c,v 1.5 1999/12/03 19:17:26 eich Exp $ */
#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif
#include <X11/Xarch.h>
#include "xf86DDC.h"
#include "vdif.h"
static xf86VdifLimitsPtr* get_limits(CARD8 *c);
static xf86VdifGammaPtr* get_gamma(CARD8 *c);
static xf86VdifTimingPtr* get_timings(CARD8 *c);
#if X_BYTE_ORDER == X_BIG_ENDIAN
static CARD32 swap_byte_order(CARD32 c);
#endif
xf86vdifPtr
xf86InterpretVdif(CARD8 *c)
{
xf86VdifPtr p = (xf86VdifPtr)c;
xf86vdifPtr vdif;
int i;
#if X_BYTE_ORDER == X_BIG_ENDIAN
int length;
#endif
unsigned long l = 0;
if (c == NULL) return NULL;
#if X_BYTE_ORDER == X_BIG_ENDIAN
length = swap_byte_order(p->FileLength);
for (i = 0; i < (length >>2); i++)
((CARD32*)c)[i] = swap_byte_order(((CARD32*)c)[i]) ;
#endif
if (p->VDIFId[0] != 'V' || p->VDIFId[1] != 'D' || p->VDIFId[2] != 'I'
|| p->VDIFId[3] != 'F') return NULL;
for ( i = 12; i < p->FileLength; i++)
l += c[i];
if ( l != p->Checksum) return NULL;
vdif = xalloc(sizeof(xf86vdif));
vdif->vdif = p;
vdif->limits = get_limits(c);
vdif->timings = get_timings(c);
vdif->gamma = get_gamma(c);
vdif->strings = VDIF_STRING(((xf86VdifPtr)c),0);
xfree(c);
return vdif;
}
static xf86VdifLimitsPtr*
get_limits(CARD8 *c)
{
int num, i, j;
xf86VdifLimitsPtr *pp;
xf86VdifLimitsPtr p;
num = ((xf86VdifPtr)c)->NumberOperationalLimits;
pp = xalloc(sizeof(xf86VdifLimitsPtr) * (num+1));
p = VDIF_OPERATIONAL_LIMITS(((xf86VdifPtr)c));
j = 0;
for ( i = 0; i<num; i++) {
if (p->Header.ScnTag == VDIF_OPERATIONAL_LIMITS_TAG)
pp[j++] = p;
VDIF_NEXT_OPERATIONAL_LIMITS(p);
}
pp[j] = NULL;
return pp;
}
static xf86VdifGammaPtr*
get_gamma(CARD8 *c)
{
int num, i, j;
xf86VdifGammaPtr *pp;
xf86VdifGammaPtr p;
num = ((xf86VdifPtr)c)->NumberOptions;
pp = xalloc(sizeof(xf86VdifGammaPtr) * (num+1));
p = (xf86VdifGammaPtr)VDIF_OPTIONS(((xf86VdifPtr)c));
j = 0;
for ( i = 0; i<num; i++)
{
if (p->Header.ScnTag == VDIF_GAMMA_TABLE_TAG)
pp[j++] = p;
VDIF_NEXT_OPTIONS(p);
}
pp[j] = NULL;
return pp;
}
static xf86VdifTimingPtr*
get_timings(CARD8 *c)
{
int num, num_limits;
int i,j,k;
xf86VdifLimitsPtr lp;
xf86VdifTimingPtr *pp;
xf86VdifTimingPtr p;
num = ((xf86VdifPtr)c)->NumberOperationalLimits;
lp = VDIF_OPERATIONAL_LIMITS(((xf86VdifPtr)c));
num_limits = 0;
for (i = 0; i < num; i++) {
if (lp->Header.ScnTag == VDIF_OPERATIONAL_LIMITS_TAG)
num_limits += lp->NumberPreadjustedTimings;
VDIF_NEXT_OPERATIONAL_LIMITS(lp);
}
pp = xalloc(sizeof(xf86VdifTimingPtr)
* (num_limits+1));
j = 0;
lp = VDIF_OPERATIONAL_LIMITS(((xf86VdifPtr) c));
for (i = 0; i < num; i++) {
p = VDIF_PREADJUSTED_TIMING(lp);
for (k = 0; k < lp->NumberPreadjustedTimings; k++) {
if (p->Header.ScnTag == VDIF_PREADJUSTED_TIMING_TAG)
pp[j++] = p;
VDIF_NEXT_PREADJUSTED_TIMING(p);
}
VDIF_NEXT_OPERATIONAL_LIMITS(lp);
}
pp[j] = NULL;
return pp;
}
#if X_BYTE_ORDER == X_BIG_ENDIAN
static CARD32
swap_byte_order(CARD32 c)
{
return ((c & 0xFF000000) >> 24) | ((c & 0xFF0000) >> 8)
| ((c & 0xFF00) << 8) | ((c & 0xFF) << 24);
}
#endif
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