-
-char bam_aux_getCSi(bam1_t *b, int i)
-{
- uint8_t *c = bam_aux_get(b, "CS");
- char *cs = NULL;
-
- // return the base if the tag was not found
- if(0 == c) return 0;
-
- cs = bam_aux2Z(c);
- // adjust for strandedness and leading adaptor
- if(bam1_strand(b)) i = strlen(cs) - 1 - i;
- else i++;
- return cs[i];
-}
-
-char bam_aux_getCQi(bam1_t *b, int i)
-{
- uint8_t *c = bam_aux_get(b, "CQ");
- char *cq = NULL;
-
- // return the base if the tag was not found
- if(0 == c) return 0;
-
- cq = bam_aux2Z(c);
- // adjust for strandedness
- if(bam1_strand(b)) i = strlen(cq) - 1 - i;
- return cq[i];
-}
-
-char bam_aux_nt2int(char a)
-{
- switch(toupper(a)) {
- case 'A':
- return 0;
- break;
- case 'C':
- return 1;
- break;
- case 'G':
- return 2;
- break;
- case 'T':
- return 3;
- break;
- default:
- return 4;
- break;
- }
-}
-
-char bam_aux_ntnt2cs(char a, char b)
-{
- a = bam_aux_nt2int(a);
- b = bam_aux_nt2int(b);
- if(4 == a || 4 == b) return '4';
- return "0123"[(int)(a ^ b)];
-}
-
-char bam_aux_getCEi(bam1_t *b, int i)
-{
- int cs_i;
- uint8_t *c = bam_aux_get(b, "CS");
- char *cs = NULL;
- char prev_b, cur_b;
- char cur_color, cor_color;
-
- // return the base if the tag was not found
- if(0 == c) return 0;
-
- cs = bam_aux2Z(c);
-
- // adjust for strandedness and leading adaptor
- if(bam1_strand(b)) { //reverse strand
- cs_i = strlen(cs) - 1 - i;
- // get current color
- cur_color = cs[cs_i];
- // get previous base
- prev_b = (0 == cs_i) ? cs[0] : bam_nt16_rev_table[bam1_seqi(bam1_seq(b), i+1)];
- // get current base
- cur_b = bam_nt16_rev_table[bam1_seqi(bam1_seq(b), i)];
- }
- else {
- cs_i=i+1;
- // get current color
- cur_color = cs[cs_i];
- // get previous base
- prev_b = (0 == i) ? cs[0] : bam_nt16_rev_table[bam1_seqi(bam1_seq(b), i-1)];
- // get current base
- cur_b = bam_nt16_rev_table[bam1_seqi(bam1_seq(b), i)];
- }
-
- // corrected color
- cor_color = bam_aux_ntnt2cs(prev_b, cur_b);
-
- if(cur_color == cor_color) {
- return '-';
- }
- else {
- return cur_color;
- }
-}