diff options
Diffstat (limited to 'xorg-server/hw/xfree86/ddc/edid.c')
-rw-r--r-- | xorg-server/hw/xfree86/ddc/edid.c | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/xorg-server/hw/xfree86/ddc/edid.c b/xorg-server/hw/xfree86/ddc/edid.c deleted file mode 100644 index 3ebafbbba..000000000 --- a/xorg-server/hw/xfree86/ddc/edid.c +++ /dev/null @@ -1,140 +0,0 @@ - -/* edid.c: retrieve EDID record from raw DDC1 data stream: data - * is contained in an array of unsigned int each unsigned int - * contains one bit if bit is 0 unsigned int has to be zero else - * unsigned int > 0 - * - * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE> - */ -#ifdef HAVE_XORG_CONFIG_H -#include <xorg-config.h> -#endif - -#include "misc.h" -#include "xf86.h" -#include "xf86_OSproc.h" -#include "xf86DDC.h" -#include "ddcPriv.h" -#include <string.h> - -static int find_start(unsigned int *); -static unsigned char * find_header(unsigned char *); -static unsigned char * resort(unsigned char *); - -unsigned char * -GetEDID_DDC1(unsigned int *s_ptr) -{ - unsigned char *d_block, *d_pos; - unsigned int *s_pos, *s_end; - int s_start; - int i,j; - s_start = find_start(s_ptr); - if (s_start==-1) return NULL; - s_end = s_ptr + NUM; - s_pos = s_ptr + s_start; - d_block=xalloc(EDID1_LEN); - if (!d_block) return NULL; - d_pos = d_block; - for (i=0;i<EDID1_LEN;i++) { - for (j=0;j<8;j++) { - *d_pos <<= 1; - if (*s_pos) { - *d_pos |= 0x01; - } - s_pos++; if (s_pos == s_end) s_pos=s_ptr; - }; - s_pos++; if (s_pos == s_end) s_pos=s_ptr; - d_pos++; - } - xfree(s_ptr); - if (d_block && DDC_checksum(d_block,EDID1_LEN)) return NULL; - return (resort(d_block)); -} - -int -DDC_checksum(unsigned char *block, int len) -{ - int i, result = 0; - int not_null = 0; - - for (i=0;i<len;i++) { - not_null |= block[i]; - result += block[i]; - } - -#ifdef DEBUG - if (result & 0xFF) ErrorF("DDC checksum not correct\n"); - if (!not_null) ErrorF("DDC read all Null\n"); -#endif - - /* catch the trivial case where all bytes are 0 */ - if (!not_null) return 1; - - return (result&0xFF); -} - -static int -find_start(unsigned int *ptr) -{ - unsigned int comp[9], test[9]; - int i,j; - - for (i=0;i<9;i++){ - comp[i] = *(ptr++); - test[i] = 1; - } - for (i=0;i<127;i++){ - for (j=0;j<9;j++){ - test[j] = test[j] & !(comp[j] ^ *(ptr++)); - } - } - for (i=0;i<9;i++) - if (test[i]) return (i+1); - return (-1); -} - -static unsigned char * -find_header(unsigned char *block) -{ - unsigned char *ptr, *head_ptr, *end; - unsigned char header[]={0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00}; - - ptr = block; - end = block + EDID1_LEN; - while (ptr<end) { - int i; - head_ptr = ptr; - for (i=0;i<8;i++){ - if (header[i] != *(head_ptr++)) break; - if (head_ptr == end) head_ptr = block; - } - if (i==8) break; - ptr++; - } - if (ptr == end) return (NULL); - return (ptr); -} - -static unsigned char * -resort(unsigned char *s_block) -{ - unsigned char *d_new, *d_ptr, *d_end, *s_ptr, *s_end; - unsigned char tmp; - - s_end = s_block + EDID1_LEN; - d_new = xalloc(EDID1_LEN); - if (!d_new) return NULL; - d_end = d_new + EDID1_LEN; - - s_ptr = find_header(s_block); - if (!s_ptr) return NULL; - for (d_ptr=d_new;d_ptr<d_end;d_ptr++){ - tmp = *(s_ptr++); - *d_ptr = tmp; - if (s_ptr == s_end) s_ptr = s_block; - } - xfree(s_block); - return (d_new); -} - - |