#include <ctype.h>
 #include "bam.h"
 #include "khash.h"
 typedef char *str_p;
 KHASH_MAP_INIT_STR(s, int)
 KHASH_MAP_INIT_STR(r2l, str_p)
 
 void bam_aux_append(bam1_t *b, const char tag[2], char type, int len, uint8_t *data)
 {
 	int ori_len = b->data_len;
 	b->data_len += 3 + len;
 	b->l_aux += 3 + len;
 	if (b->m_data < b->data_len) {
 		b->m_data = b->data_len;
 		kroundup32(b->m_data);
 		b->data = (uint8_t*)realloc(b->data, b->m_data);
 	}
 	b->data[ori_len] = tag[0]; b->data[ori_len + 1] = tag[1];
 	b->data[ori_len + 2] = type;
 	memcpy(b->data + ori_len + 3, data, len);
 }
 
 uint8_t *bam_aux_get_core(bam1_t *b, const char tag[2])
 {
 	return bam_aux_get(b, tag);
 }
 
 #define __skip_tag(s) do { \
 		int type = toupper(*(s)); \
 		++(s); \
 		if (type == 'Z' || type == 'H') { while (*(s)) ++(s); ++(s); } \
 		else if (type == 'B') (s) += 5 + bam_aux_type2size(*(s)) * (*(int32_t*)((s)+1)); \
 		else (s) += bam_aux_type2size(type); \
 	} while(0)
 
 uint8_t *bam_aux_get(const bam1_t *b, const char tag[2])
 {
 	uint8_t *s;
 	int y = tag[0]<<8 | tag[1];
 	s = bam1_aux(b);
 	while (s < b->data + b->data_len) {
 		int x = (int)s[0]<<8 | s[1];
 		s += 2;
 		if (x == y) return s;
 		__skip_tag(s);
 	}
 	return 0;
 }
 // s MUST BE returned by bam_aux_get()
 int bam_aux_del(bam1_t *b, uint8_t *s)
 {
 	uint8_t *p, *aux;
 	aux = bam1_aux(b);
 	p = s - 2;
 	__skip_tag(s);
 	memmove(p, s, b->l_aux - (s - aux));
 	b->data_len -= s - p;
 	b->l_aux -= s - p;
 	return 0;
 }
 
 int bam_aux_drop_other(bam1_t *b, uint8_t *s)
 {
 	if (s) {
 		uint8_t *p, *aux;
 		aux = bam1_aux(b);
 		p = s - 2;
 		__skip_tag(s);
 		memmove(aux, p, s - p);
 		b->data_len -= b->l_aux - (s - p);
 		b->l_aux = s - p;
 	} else {
 		b->data_len -= b->l_aux;
 		b->l_aux = 0;
 	}
 	return 0;
 }
 
 void bam_init_header_hash(bam_header_t *header)
 {
 	if (header->hash == 0) {
 		int ret, i;
 		khiter_t iter;
 		khash_t(s) *h;
 		header->hash = h = kh_init(s);
 		for (i = 0; i < header->n_targets; ++i) {
 			iter = kh_put(s, h, header->target_name[i], &ret);
 			kh_value(h, iter) = i;
 		}
 	}
 }
 
 void bam_destroy_header_hash(bam_header_t *header)
 {
 	if (header->hash)
 		kh_destroy(s, (khash_t(s)*)header->hash);
 }
 
 int32_t bam_get_tid(const bam_header_t *header, const char *seq_name)
 {
 	khint_t k;
 	khash_t(s) *h = (khash_t(s)*)header->hash;
 	k = kh_get(s, h, seq_name);
 	return k == kh_end(h)? -1 : kh_value(h, k);
 }
 
 int bam_parse_region(bam_header_t *header, const char *str, int *ref_id, int *beg, int *end)
 {
 	char *s;
 	int i, l, k, name_end;
 	khiter_t iter;
 	khash_t(s) *h;
 
 	bam_init_header_hash(header);
 	h = (khash_t(s)*)header->hash;
 
 	*ref_id = *beg = *end = -1;
 	name_end = l = strlen(str);
 	s = (char*)malloc(l+1);
 	// remove space
 	for (i = k = 0; i < l; ++i)
 		if (!isspace(str[i])) s[k++] = str[i];
 	s[k] = 0; l = k;
 	// determine the sequence name
 	for (i = l - 1; i >= 0; --i) if (s[i] == ':') break; // look for colon from the end
 	if (i >= 0) name_end = i;
 	if (name_end < l) { // check if this is really the end
 		int n_hyphen = 0;
 		for (i = name_end + 1; i < l; ++i) {
 			if (s[i] == '-') ++n_hyphen;
 			else if (!isdigit(s[i]) && s[i] != ',') break;
 		}
 		if (i < l || n_hyphen > 1) name_end = l; // malformated region string; then take str as the name
 		s[name_end] = 0;
 		iter = kh_get(s, h, s);
 		if (iter == kh_end(h)) { // cannot find the sequence name
 			iter = kh_get(s, h, str); // try str as the name
 			if (iter == kh_end(h)) {
 				if (bam_verbose >= 2) fprintf(stderr, "[%s] fail to determine the sequence name.\n", __func__);
 				free(s); return -1;
 			} else s[name_end] = ':', name_end = l;
 		}
 	} else iter = kh_get(s, h, str);
         if (iter == kh_end(h)) {
           free(s); 
           return -1;
         }
 	*ref_id = kh_val(h, iter);
 	// parse the interval
 	if (name_end < l) {
 		for (i = k = name_end + 1; i < l; ++i)
 			if (s[i] != ',') s[k++] = s[i];
 		s[k] = 0;
 		*beg = atoi(s + name_end + 1);
 		for (i = name_end + 1; i != k; ++i) if (s[i] == '-') break;
 		*end = i < k? atoi(s + i + 1) : 1<<29;
 		if (*beg > 0) --*beg;
 	} else *beg = 0, *end = 1<<29;
 	free(s);
 	return *beg <= *end? 0 : -1;
 }
 
 int32_t bam_aux2i(const uint8_t *s)
 {
 	int type;
 	if (s == 0) return 0;
 	type = *s++;
 	if (type == 'c') return (int32_t)*(int8_t*)s;
 	else if (type == 'C') return (int32_t)*(uint8_t*)s;
 	else if (type == 's') return (int32_t)*(int16_t*)s;
 	else if (type == 'S') return (int32_t)*(uint16_t*)s;
 	else if (type == 'i' || type == 'I') return *(int32_t*)s;
 	else return 0;
 }
 
 float bam_aux2f(const uint8_t *s)
 {
 	int type;
 	type = *s++;
 	if (s == 0) return 0.0;
 	if (type == 'f') return *(float*)s;
 	else return 0.0;
 }
 
 double bam_aux2d(const uint8_t *s)
 {
 	int type;
 	type = *s++;
 	if (s == 0) return 0.0;
 	if (type == 'd') return *(double*)s;
 	else return 0.0;
 }
 
 char bam_aux2A(const uint8_t *s)
 {
 	int type;
 	type = *s++;
 	if (s == 0) return 0;
 	if (type == 'A') return *(char*)s;
 	else return 0;
 }
 
 char *bam_aux2Z(const uint8_t *s)
 {
 	int type;
 	type = *s++;
 	if (s == 0) return 0;
 	if (type == 'Z' || type == 'H') return (char*)s;
 	else return 0;
 }
 
 #ifdef _WIN32
 double drand48()
 {
 	return (double)rand() / RAND_MAX;
 }
 #endif