// FIXME: we should also check the LB tag associated with each alignment
const char *bam_get_library(bam_header_t *h, const bam1_t *b)
{
const uint8_t *rg;
if (h->dict == 0) h->dict = sam_header_parse2(h->text);
if (h->rg2lib == 0) h->rg2lib = sam_header2tbl(h->dict, "RG", "ID", "LB");
rg = bam_aux_get(b, "RG");
return (rg == 0)? 0 : sam_tbl_get(h->rg2lib, (const char*)(rg + 1));
}
samfile_t* b2g_samfile_open(char* path, char* mode, void* aux, ...) {
char filename[1024] = {};
va_list args;
va_start(args, aux);
vsprintf(filename, path, args);
va_end(args);
if ('r' == mode[0] && access(filename, R_OK)) return NULL;
samfile_t *in = samopen(filename, mode, aux);
if (in) {
if (!in->header) return NULL;
// Make sure to parse the header for later use.
bam_header_t *header = in->header;
if (header->dict == 0) header->dict = sam_header_parse2(header->text);
if (header->rg2lib == 0) header->rg2lib = sam_header2tbl(header->dict, "RG", "ID", "LB");
}
return in;
}