6 #include "bam_endian.h"
10 char *bam_flag2char_table = "pPuUrR12sfd\0\0\0\0\0";
12 /**************************
13 * CIGAR related routines *
14 **************************/
16 int bam_segreg(int32_t pos, const bam1_core_t *c, const uint32_t *cigar, bam_segreg_t *reg)
19 int32_t x = c->pos, y = 0;
21 for (k = 0; k < c->n_cigar; ++k) {
22 int op = cigar[k] & BAM_CIGAR_MASK; // operation
23 int l = cigar[k] >> BAM_CIGAR_SHIFT; // length
24 if (state == 0 && (op == BAM_CMATCH || op == BAM_CDEL || op == BAM_CINS) && x + l > pos) {
25 reg->tbeg = x; reg->qbeg = y; reg->cbeg = k;
28 if (op == BAM_CMATCH) { x += l; y += l; }
29 else if (op == BAM_CDEL || op == BAM_CREF_SKIP) x += l;
30 else if (op == BAM_CINS || op == BAM_CSOFT_CLIP) y += l;
31 if (state == 1 && (op == BAM_CSOFT_CLIP || op == BAM_CHARD_CLIP || op == BAM_CREF_SKIP || k == c->n_cigar - 1)) {
32 reg->tend = x; reg->qend = y; reg->cend = k;
38 uint32_t bam_calend(const bam1_core_t *c, const uint32_t *cigar)
42 for (k = 0; k < c->n_cigar; ++k) {
43 int op = cigar[k] & BAM_CIGAR_MASK;
44 if (op == BAM_CMATCH || op == BAM_CDEL || op == BAM_CREF_SKIP)
45 end += cigar[k] >> BAM_CIGAR_SHIFT;
50 int32_t bam_cigar2qlen(const bam1_core_t *c, const uint32_t *cigar)
54 for (k = 0; k < c->n_cigar; ++k) {
55 int op = cigar[k] & BAM_CIGAR_MASK;
56 if (op == BAM_CMATCH || op == BAM_CINS || op == BAM_CSOFT_CLIP)
57 l += cigar[k] >> BAM_CIGAR_SHIFT;
66 bam_header_t *bam_header_init()
68 bam_is_be = bam_is_big_endian();
69 return (bam_header_t*)calloc(1, sizeof(bam_header_t));
72 void bam_header_destroy(bam_header_t *header)
75 extern void bam_destroy_header_hash(bam_header_t *header);
76 if (header == 0) return;
77 if (header->target_name) {
78 for (i = 0; i < header->n_targets; ++i)
79 free(header->target_name[i]);
80 free(header->target_name);
81 free(header->target_len);
85 if (header->rg2lib) bam_strmap_destroy(header->rg2lib);
86 bam_destroy_header_hash(header);
91 bam_header_t *bam_header_read(bamFile fp)
95 int32_t i = 1, name_len;
97 i = bgzf_check_EOF(fp);
99 // If the file is a pipe, checking the EOF marker will *always* fail
100 // with ESPIPE. Suppress the error message in this case.
101 if (errno != ESPIPE) perror("[bam_header_read] bgzf_check_EOF");
103 else if (i == 0) fprintf(stderr, "[bam_header_read] EOF marker is absent.\n");
105 if (bam_read(fp, buf, 4) != 4) return 0;
106 if (strncmp(buf, "BAM\001", 4)) {
107 fprintf(stderr, "[bam_header_read] wrong header\n");
110 header = bam_header_init();
111 // read plain text and the number of reference sequences
112 bam_read(fp, &header->l_text, 4);
113 if (bam_is_be) bam_swap_endian_4p(&header->l_text);
114 header->text = (char*)calloc(header->l_text + 1, 1);
115 bam_read(fp, header->text, header->l_text);
116 bam_read(fp, &header->n_targets, 4);
117 if (bam_is_be) bam_swap_endian_4p(&header->n_targets);
118 // read reference sequence names and lengths
119 header->target_name = (char**)calloc(header->n_targets, sizeof(char*));
120 header->target_len = (uint32_t*)calloc(header->n_targets, 4);
121 for (i = 0; i != header->n_targets; ++i) {
122 bam_read(fp, &name_len, 4);
123 if (bam_is_be) bam_swap_endian_4p(&name_len);
124 header->target_name[i] = (char*)calloc(name_len, 1);
125 bam_read(fp, header->target_name[i], name_len);
126 bam_read(fp, &header->target_len[i], 4);
127 if (bam_is_be) bam_swap_endian_4p(&header->target_len[i]);
132 int bam_header_write(bamFile fp, const bam_header_t *header)
135 int32_t i, name_len, x;
137 strncpy(buf, "BAM\001", 4);
138 bam_write(fp, buf, 4);
139 // write plain text and the number of reference sequences
141 x = bam_swap_endian_4(header->l_text);
142 bam_write(fp, &x, 4);
143 if (header->l_text) bam_write(fp, header->text, header->l_text);
144 x = bam_swap_endian_4(header->n_targets);
145 bam_write(fp, &x, 4);
147 bam_write(fp, &header->l_text, 4);
148 if (header->l_text) bam_write(fp, header->text, header->l_text);
149 bam_write(fp, &header->n_targets, 4);
151 // write sequence names and lengths
152 for (i = 0; i != header->n_targets; ++i) {
153 char *p = header->target_name[i];
154 name_len = strlen(p) + 1;
156 x = bam_swap_endian_4(name_len);
157 bam_write(fp, &x, 4);
158 } else bam_write(fp, &name_len, 4);
159 bam_write(fp, p, name_len);
161 x = bam_swap_endian_4(header->target_len[i]);
162 bam_write(fp, &x, 4);
163 } else bam_write(fp, &header->target_len[i], 4);
168 static void swap_endian_data(const bam1_core_t *c, int data_len, uint8_t *data)
171 uint32_t i, *cigar = (uint32_t*)(data + c->l_qname);
172 s = data + c->n_cigar*4 + c->l_qname + c->l_qseq + (c->l_qseq + 1)/2;
173 for (i = 0; i < c->n_cigar; ++i) bam_swap_endian_4p(&cigar[i]);
174 while (s < data + data_len) {
177 type = toupper(*s); ++s; // skip type
178 if (type == 'C' || type == 'A') ++s;
179 else if (type == 'S') { bam_swap_endian_2p(s); s += 2; }
180 else if (type == 'I' || type == 'F') { bam_swap_endian_4p(s); s += 4; }
181 else if (type == 'D') { bam_swap_endian_8p(s); s += 8; }
182 else if (type == 'Z' || type == 'H') { while (*s) ++s; ++s; }
186 int bam_read1(bamFile fp, bam1_t *b)
188 bam1_core_t *c = &b->core;
189 int32_t block_len, ret, i;
192 assert(BAM_CORE_SIZE == 32);
193 if ((ret = bam_read(fp, &block_len, 4)) != 4) {
194 if (ret == 0) return -1; // normal end-of-file
195 else return -2; // truncated
197 if (bam_read(fp, x, BAM_CORE_SIZE) != BAM_CORE_SIZE) return -3;
199 bam_swap_endian_4p(&block_len);
200 for (i = 0; i < 8; ++i) bam_swap_endian_4p(x + i);
202 c->tid = x[0]; c->pos = x[1];
203 c->bin = x[2]>>16; c->qual = x[2]>>8&0xff; c->l_qname = x[2]&0xff;
204 c->flag = x[3]>>16; c->n_cigar = x[3]&0xffff;
206 c->mtid = x[5]; c->mpos = x[6]; c->isize = x[7];
207 b->data_len = block_len - BAM_CORE_SIZE;
208 if (b->m_data < b->data_len) {
209 b->m_data = b->data_len;
210 kroundup32(b->m_data);
211 b->data = (uint8_t*)realloc(b->data, b->m_data);
213 if (bam_read(fp, b->data, b->data_len) != b->data_len) return -4;
214 b->l_aux = b->data_len - c->n_cigar * 4 - c->l_qname - c->l_qseq - (c->l_qseq+1)/2;
215 if (bam_is_be) swap_endian_data(c, b->data_len, b->data);
216 return 4 + block_len;
219 inline int bam_write1_core(bamFile fp, const bam1_core_t *c, int data_len, uint8_t *data)
221 uint32_t x[8], block_len = data_len + BAM_CORE_SIZE, y;
223 assert(BAM_CORE_SIZE == 32);
226 x[2] = (uint32_t)c->bin<<16 | c->qual<<8 | c->l_qname;
227 x[3] = (uint32_t)c->flag<<16 | c->n_cigar;
233 for (i = 0; i < 8; ++i) bam_swap_endian_4p(x + i);
235 bam_write(fp, bam_swap_endian_4p(&y), 4);
236 swap_endian_data(c, data_len, data);
237 } else bam_write(fp, &block_len, 4);
238 bam_write(fp, x, BAM_CORE_SIZE);
239 bam_write(fp, data, data_len);
240 if (bam_is_be) swap_endian_data(c, data_len, data);
241 return 4 + block_len;
244 int bam_write1(bamFile fp, const bam1_t *b)
246 return bam_write1_core(fp, &b->core, b->data_len, b->data);
249 char *bam_format1_core(const bam_header_t *header, const bam1_t *b, int of)
251 uint8_t *s = bam1_seq(b), *t = bam1_qual(b);
253 const bam1_core_t *c = &b->core;
255 str.l = str.m = 0; str.s = 0;
257 ksprintf(&str, "%s\t", bam1_qname(b));
258 if (of == BAM_OFDEC) ksprintf(&str, "%d\t", c->flag);
259 else if (of == BAM_OFHEX) ksprintf(&str, "0x%x\t", c->flag);
261 for (i = 0; i < 16; ++i)
262 if ((c->flag & 1<<i) && bam_flag2char_table[i])
263 kputc(bam_flag2char_table[i], &str);
266 if (c->tid < 0) kputs("*\t", &str);
267 else ksprintf(&str, "%s\t", header->target_name[c->tid]);
268 ksprintf(&str, "%d\t%d\t", c->pos + 1, c->qual);
269 if (c->n_cigar == 0) kputc('*', &str);
271 for (i = 0; i < c->n_cigar; ++i)
272 ksprintf(&str, "%d%c", bam1_cigar(b)[i]>>BAM_CIGAR_SHIFT, "MIDNSHP"[bam1_cigar(b)[i]&BAM_CIGAR_MASK]);
275 if (c->mtid < 0) kputs("*\t", &str);
276 else if (c->mtid == c->tid) kputs("=\t", &str);
277 else ksprintf(&str, "%s\t", header->target_name[c->mtid]);
278 ksprintf(&str, "%d\t%d\t", c->mpos + 1, c->isize);
280 for (i = 0; i < c->l_qseq; ++i) kputc(bam_nt16_rev_table[bam1_seqi(s, i)], &str);
282 if (t[0] == 0xff) kputc('*', &str);
283 else for (i = 0; i < c->l_qseq; ++i) kputc(t[i] + 33, &str);
284 } else ksprintf(&str, "*\t*");
286 while (s < b->data + b->data_len) {
287 uint8_t type, key[2];
288 key[0] = s[0]; key[1] = s[1];
289 s += 2; type = *s; ++s;
290 ksprintf(&str, "\t%c%c:", key[0], key[1]);
291 if (type == 'A') { ksprintf(&str, "A:%c", *s); ++s; }
292 else if (type == 'C') { ksprintf(&str, "i:%u", *s); ++s; }
293 else if (type == 'c') { ksprintf(&str, "i:%d", *s); ++s; }
294 else if (type == 'S') { ksprintf(&str, "i:%u", *(uint16_t*)s); s += 2; }
295 else if (type == 's') { ksprintf(&str, "i:%d", *(int16_t*)s); s += 2; }
296 else if (type == 'I') { ksprintf(&str, "i:%u", *(uint32_t*)s); s += 4; }
297 else if (type == 'i') { ksprintf(&str, "i:%d", *(int32_t*)s); s += 4; }
298 else if (type == 'f') { ksprintf(&str, "f:%g", *(float*)s); s += 4; }
299 else if (type == 'd') { ksprintf(&str, "d:%lg", *(double*)s); s += 8; }
300 else if (type == 'Z' || type == 'H') { ksprintf(&str, "%c:", type); while (*s) kputc(*s++, &str); ++s; }
305 char *bam_format1(const bam_header_t *header, const bam1_t *b)
307 return bam_format1_core(header, b, BAM_OFDEC);
310 void bam_view1(const bam_header_t *header, const bam1_t *b)
312 char *s = bam_format1(header, b);