130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/* $XFree86: xc/programs/Xserver/hw/xfree86/ddc/interpret_vdif.c,v 1.6 2000/01/21 02:30:00 dawes Exp $ */
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#include "Xarch.h"
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#include "xf86DDC.h"
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#include "vdif.h"
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static xf86VdifLimitsPtr* get_limits(CARD8 *c);
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static xf86VdifGammaPtr* get_gamma(CARD8 *c);
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static xf86VdifTimingPtr* get_timings(CARD8 *c);
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#if X_BYTE_ORDER == X_BIG_ENDIAN
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static CARD32 swap_byte_order(CARD32 c);
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#endif
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xf86vdifPtr
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xf86InterpretVdif(CARD8 *c)
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{
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xf86VdifPtr p = (xf86VdifPtr)c;
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xf86vdifPtr vdif;
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int i;
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#if X_BYTE_ORDER == X_BIG_ENDIAN
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int length;
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#endif
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unsigned long l = 0;
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if (c == NULL) return NULL;
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#if X_BYTE_ORDER == X_BIG_ENDIAN
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length = swap_byte_order(p->FileLength);
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for (i = 0; i < (length >>2); i++)
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((CARD32*)c)[i] = swap_byte_order(((CARD32*)c)[i]) ;
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#endif
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if (p->VDIFId[0] != 'V' || p->VDIFId[1] != 'D' || p->VDIFId[2] != 'I'
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|| p->VDIFId[3] != 'F') return NULL;
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for ( i = 12; i < p->FileLength; i++)
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l += c[i];
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if ( l != p->Checksum) return NULL;
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vdif = xalloc(sizeof(xf86vdif));
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vdif->vdif = p;
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vdif->limits = get_limits(c);
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vdif->timings = get_timings(c);
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vdif->gamma = get_gamma(c);
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vdif->strings = VDIF_STRING(((xf86VdifPtr)c),0);
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xfree(c);
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return vdif;
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}
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static xf86VdifLimitsPtr*
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get_limits(CARD8 *c)
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{
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int num, i, j;
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xf86VdifLimitsPtr *pp;
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xf86VdifLimitsPtr p;
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num = ((xf86VdifPtr)c)->NumberOperationalLimits;
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pp = xalloc(sizeof(xf86VdifLimitsPtr) * (num+1));
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p = VDIF_OPERATIONAL_LIMITS(((xf86VdifPtr)c));
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j = 0;
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for ( i = 0; i<num; i++) {
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if (p->Header.ScnTag == VDIF_OPERATIONAL_LIMITS_TAG)
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pp[j++] = p;
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VDIF_NEXT_OPERATIONAL_LIMITS(p);
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}
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pp[j] = NULL;
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return pp;
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}
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static xf86VdifGammaPtr*
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get_gamma(CARD8 *c)
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{
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int num, i, j;
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xf86VdifGammaPtr *pp;
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xf86VdifGammaPtr p;
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num = ((xf86VdifPtr)c)->NumberOptions;
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pp = xalloc(sizeof(xf86VdifGammaPtr) * (num+1));
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p = (xf86VdifGammaPtr)VDIF_OPTIONS(((xf86VdifPtr)c));
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j = 0;
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for ( i = 0; i<num; i++)
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{
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if (p->Header.ScnTag == VDIF_GAMMA_TABLE_TAG)
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pp[j++] = p;
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VDIF_NEXT_OPTIONS(p);
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}
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pp[j] = NULL;
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return pp;
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}
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static xf86VdifTimingPtr*
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get_timings(CARD8 *c)
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{
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int num, num_limits;
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int i,j,k;
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xf86VdifLimitsPtr lp;
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xf86VdifTimingPtr *pp;
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xf86VdifTimingPtr p;
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num = ((xf86VdifPtr)c)->NumberOperationalLimits;
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lp = VDIF_OPERATIONAL_LIMITS(((xf86VdifPtr)c));
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num_limits = 0;
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for (i = 0; i < num; i++) {
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if (lp->Header.ScnTag == VDIF_OPERATIONAL_LIMITS_TAG)
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num_limits += lp->NumberPreadjustedTimings;
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VDIF_NEXT_OPERATIONAL_LIMITS(lp);
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}
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pp = xalloc(sizeof(xf86VdifTimingPtr)
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* (num_limits+1));
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j = 0;
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lp = VDIF_OPERATIONAL_LIMITS(((xf86VdifPtr) c));
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for (i = 0; i < num; i++) {
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p = VDIF_PREADJUSTED_TIMING(lp);
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for (k = 0; k < lp->NumberPreadjustedTimings; k++) {
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if (p->Header.ScnTag == VDIF_PREADJUSTED_TIMING_TAG)
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pp[j++] = p;
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VDIF_NEXT_PREADJUSTED_TIMING(p);
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}
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VDIF_NEXT_OPERATIONAL_LIMITS(lp);
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}
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pp[j] = NULL;
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return pp;
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}
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#if X_BYTE_ORDER == X_BIG_ENDIAN
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static CARD32
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swap_byte_order(CARD32 c)
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{
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return ((c & 0xFF000000) >> 24) | ((c & 0xFF0000) >> 8)
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| ((c & 0xFF00) << 8) | ((c & 0xFF) << 24);
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}
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#endif
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