8 #include "bam_endian.h"
10 #include "sam_header.h"
12 int bam_is_be = 0, bam_verbose = 2;
13 char *bam_flag2char_table = "pPuUrR12sfd\0\0\0\0\0";
15 /**************************
16 * CIGAR related routines *
17 **************************/
19 uint32_t bam_calend(const bam1_core_t *c, const uint32_t *cigar)
23 for (k = 0; k < c->n_cigar; ++k) {
24 int op = cigar[k] & BAM_CIGAR_MASK;
25 if (op == BAM_CMATCH || op == BAM_CDEL || op == BAM_CREF_SKIP)
26 end += cigar[k] >> BAM_CIGAR_SHIFT;
31 int32_t bam_cigar2qlen(const bam1_core_t *c, const uint32_t *cigar)
35 for (k = 0; k < c->n_cigar; ++k) {
36 int op = cigar[k] & BAM_CIGAR_MASK;
37 if (op == BAM_CMATCH || op == BAM_CINS || op == BAM_CSOFT_CLIP)
38 l += cigar[k] >> BAM_CIGAR_SHIFT;
47 bam_header_t *bam_header_init()
49 bam_is_be = bam_is_big_endian();
50 return (bam_header_t*)calloc(1, sizeof(bam_header_t));
53 void bam_header_destroy(bam_header_t *header)
56 extern void bam_destroy_header_hash(bam_header_t *header);
57 if (header == 0) return;
58 if (header->target_name) {
59 for (i = 0; i < header->n_targets; ++i)
60 free(header->target_name[i]);
61 free(header->target_name);
62 free(header->target_len);
65 if (header->dict) sam_header_free(header->dict);
66 if (header->rg2lib) sam_tbl_destroy(header->rg2lib);
67 bam_destroy_header_hash(header);
71 bam_header_t *bam_header_read(bamFile fp)
76 int32_t i = 1, name_len;
78 i = bgzf_check_EOF(fp);
80 // If the file is a pipe, checking the EOF marker will *always* fail
81 // with ESPIPE. Suppress the error message in this case.
82 if (errno != ESPIPE) perror("[bam_header_read] bgzf_check_EOF");
84 else if (i == 0) fprintf(pysamerr, "[bam_header_read] EOF marker is absent. The input is probably truncated.\n");
86 magic_len = bam_read(fp, buf, 4);
87 if (magic_len != 4 || strncmp(buf, "BAM\001", 4) != 0) {
88 fprintf(pysamerr, "[bam_header_read] invalid BAM binary header (this is not a BAM file).\n");
91 header = bam_header_init();
92 // read plain text and the number of reference sequences
93 bam_read(fp, &header->l_text, 4);
94 if (bam_is_be) bam_swap_endian_4p(&header->l_text);
95 header->text = (char*)calloc(header->l_text + 1, 1);
96 bam_read(fp, header->text, header->l_text);
97 bam_read(fp, &header->n_targets, 4);
98 if (bam_is_be) bam_swap_endian_4p(&header->n_targets);
99 // read reference sequence names and lengths
100 header->target_name = (char**)calloc(header->n_targets, sizeof(char*));
101 header->target_len = (uint32_t*)calloc(header->n_targets, 4);
102 for (i = 0; i != header->n_targets; ++i) {
103 bam_read(fp, &name_len, 4);
104 if (bam_is_be) bam_swap_endian_4p(&name_len);
105 header->target_name[i] = (char*)calloc(name_len, 1);
106 bam_read(fp, header->target_name[i], name_len);
107 bam_read(fp, &header->target_len[i], 4);
108 if (bam_is_be) bam_swap_endian_4p(&header->target_len[i]);
113 int bam_header_write(bamFile fp, const bam_header_t *header)
116 int32_t i, name_len, x;
118 strncpy(buf, "BAM\001", 4);
119 bam_write(fp, buf, 4);
120 // write plain text and the number of reference sequences
122 x = bam_swap_endian_4(header->l_text);
123 bam_write(fp, &x, 4);
124 if (header->l_text) bam_write(fp, header->text, header->l_text);
125 x = bam_swap_endian_4(header->n_targets);
126 bam_write(fp, &x, 4);
128 bam_write(fp, &header->l_text, 4);
129 if (header->l_text) bam_write(fp, header->text, header->l_text);
130 bam_write(fp, &header->n_targets, 4);
132 // write sequence names and lengths
133 for (i = 0; i != header->n_targets; ++i) {
134 char *p = header->target_name[i];
135 name_len = strlen(p) + 1;
137 x = bam_swap_endian_4(name_len);
138 bam_write(fp, &x, 4);
139 } else bam_write(fp, &name_len, 4);
140 bam_write(fp, p, name_len);
142 x = bam_swap_endian_4(header->target_len[i]);
143 bam_write(fp, &x, 4);
144 } else bam_write(fp, &header->target_len[i], 4);
150 static void swap_endian_data(const bam1_core_t *c, int data_len, uint8_t *data)
153 uint32_t i, *cigar = (uint32_t*)(data + c->l_qname);
154 s = data + c->n_cigar*4 + c->l_qname + c->l_qseq + (c->l_qseq + 1)/2;
155 for (i = 0; i < c->n_cigar; ++i) bam_swap_endian_4p(&cigar[i]);
156 while (s < data + data_len) {
159 type = toupper(*s); ++s; // skip type
160 if (type == 'C' || type == 'A') ++s;
161 else if (type == 'S') { bam_swap_endian_2p(s); s += 2; }
162 else if (type == 'I' || type == 'F') { bam_swap_endian_4p(s); s += 4; }
163 else if (type == 'D') { bam_swap_endian_8p(s); s += 8; }
164 else if (type == 'Z' || type == 'H') { while (*s) ++s; ++s; }
165 else if (type == 'B') {
166 int32_t n, Bsize = bam_aux_type2size(*s);
167 memcpy(&n, s + 1, 4);
169 } else if (2 == Bsize) {
170 for (i = 0; i < n; i += 2)
171 bam_swap_endian_2p(s + 5 + i);
172 } else if (4 == Bsize) {
173 for (i = 0; i < n; i += 4)
174 bam_swap_endian_4p(s + 5 + i);
176 bam_swap_endian_4p(s+1);
181 int bam_read1(bamFile fp, bam1_t *b)
183 bam1_core_t *c = &b->core;
184 int32_t block_len, ret, i;
187 assert(BAM_CORE_SIZE == 32);
188 if ((ret = bam_read(fp, &block_len, 4)) != 4) {
189 if (ret == 0) return -1; // normal end-of-file
190 else return -2; // truncated
192 if (bam_read(fp, x, BAM_CORE_SIZE) != BAM_CORE_SIZE) return -3;
194 bam_swap_endian_4p(&block_len);
195 for (i = 0; i < 8; ++i) bam_swap_endian_4p(x + i);
197 c->tid = x[0]; c->pos = x[1];
198 c->bin = x[2]>>16; c->qual = x[2]>>8&0xff; c->l_qname = x[2]&0xff;
199 c->flag = x[3]>>16; c->n_cigar = x[3]&0xffff;
201 c->mtid = x[5]; c->mpos = x[6]; c->isize = x[7];
202 b->data_len = block_len - BAM_CORE_SIZE;
203 if (b->m_data < b->data_len) {
204 b->m_data = b->data_len;
205 kroundup32(b->m_data);
206 b->data = (uint8_t*)realloc(b->data, b->m_data);
208 if (bam_read(fp, b->data, b->data_len) != b->data_len) return -4;
209 b->l_aux = b->data_len - c->n_cigar * 4 - c->l_qname - c->l_qseq - (c->l_qseq+1)/2;
210 if (bam_is_be) swap_endian_data(c, b->data_len, b->data);
211 return 4 + block_len;
214 inline int bam_write1_core(bamFile fp, const bam1_core_t *c, int data_len, uint8_t *data)
216 uint32_t x[8], block_len = data_len + BAM_CORE_SIZE, y;
218 assert(BAM_CORE_SIZE == 32);
221 x[2] = (uint32_t)c->bin<<16 | c->qual<<8 | c->l_qname;
222 x[3] = (uint32_t)c->flag<<16 | c->n_cigar;
227 bgzf_flush_try(fp, 4 + block_len);
229 for (i = 0; i < 8; ++i) bam_swap_endian_4p(x + i);
231 bam_write(fp, bam_swap_endian_4p(&y), 4);
232 swap_endian_data(c, data_len, data);
233 } else bam_write(fp, &block_len, 4);
234 bam_write(fp, x, BAM_CORE_SIZE);
235 bam_write(fp, data, data_len);
236 if (bam_is_be) swap_endian_data(c, data_len, data);
237 return 4 + block_len;
240 int bam_write1(bamFile fp, const bam1_t *b)
242 return bam_write1_core(fp, &b->core, b->data_len, b->data);
245 char *bam_format1_core(const bam_header_t *header, const bam1_t *b, int of)
247 uint8_t *s = bam1_seq(b), *t = bam1_qual(b);
249 const bam1_core_t *c = &b->core;
251 str.l = str.m = 0; str.s = 0;
253 kputsn(bam1_qname(b), c->l_qname-1, &str); kputc('\t', &str);
254 if (of == BAM_OFDEC) { kputw(c->flag, &str); kputc('\t', &str); }
255 else if (of == BAM_OFHEX) ksprintf(&str, "0x%x\t", c->flag);
257 for (i = 0; i < 16; ++i)
258 if ((c->flag & 1<<i) && bam_flag2char_table[i])
259 kputc(bam_flag2char_table[i], &str);
262 if (c->tid < 0) kputsn("*\t", 2, &str);
264 if (header) kputs(header->target_name[c->tid] , &str);
265 else kputw(c->tid, &str);
268 kputw(c->pos + 1, &str); kputc('\t', &str); kputw(c->qual, &str); kputc('\t', &str);
269 if (c->n_cigar == 0) kputc('*', &str);
271 for (i = 0; i < c->n_cigar; ++i) {
272 kputw(bam1_cigar(b)[i]>>BAM_CIGAR_SHIFT, &str);
273 kputc("MIDNSHP"[bam1_cigar(b)[i]&BAM_CIGAR_MASK], &str);
277 if (c->mtid < 0) kputsn("*\t", 2, &str);
278 else if (c->mtid == c->tid) kputsn("=\t", 2, &str);
280 if (header) kputs(header->target_name[c->mtid], &str);
281 else kputw(c->mtid, &str);
284 kputw(c->mpos + 1, &str); kputc('\t', &str); kputw(c->isize, &str); kputc('\t', &str);
286 for (i = 0; i < c->l_qseq; ++i) kputc(bam_nt16_rev_table[bam1_seqi(s, i)], &str);
288 if (t[0] == 0xff) kputc('*', &str);
289 else for (i = 0; i < c->l_qseq; ++i) kputc(t[i] + 33, &str);
290 } else kputsn("*\t*", 3, &str);
292 while (s < b->data + b->data_len) {
293 uint8_t type, key[2];
294 key[0] = s[0]; key[1] = s[1];
295 s += 2; type = *s; ++s;
296 kputc('\t', &str); kputsn((char*)key, 2, &str); kputc(':', &str);
297 if (type == 'A') { kputsn("A:", 2, &str); kputc(*s, &str); ++s; }
298 else if (type == 'C') { kputsn("i:", 2, &str); kputw(*s, &str); ++s; }
299 else if (type == 'c') { kputsn("i:", 2, &str); kputw(*(int8_t*)s, &str); ++s; }
300 else if (type == 'S') { kputsn("i:", 2, &str); kputw(*(uint16_t*)s, &str); s += 2; }
301 else if (type == 's') { kputsn("i:", 2, &str); kputw(*(int16_t*)s, &str); s += 2; }
302 else if (type == 'I') { kputsn("i:", 2, &str); kputuw(*(uint32_t*)s, &str); s += 4; }
303 else if (type == 'i') { kputsn("i:", 2, &str); kputw(*(int32_t*)s, &str); s += 4; }
304 else if (type == 'f') { ksprintf(&str, "f:%g", *(float*)s); s += 4; }
305 else if (type == 'd') { ksprintf(&str, "d:%lg", *(double*)s); s += 8; }
306 else if (type == 'Z' || type == 'H') { kputc(type, &str); kputc(':', &str); while (*s) kputc(*s++, &str); ++s; }
307 else if (type == 'B') {
308 uint8_t sub_type = *(s++);
311 s += 4; // no point to the start of the array
312 kputc(type, &str); kputc(':', &str); kputc(sub_type, &str); // write the typing
313 for (i = 0; i < n; ++i) {
315 if ('c' == sub_type || 'c' == sub_type) { kputw(*(int8_t*)s, &str); ++s; }
316 else if ('C' == sub_type) { kputw(*(uint8_t*)s, &str); ++s; }
317 else if ('s' == sub_type) { kputw(*(int16_t*)s, &str); s += 2; }
318 else if ('S' == sub_type) { kputw(*(uint16_t*)s, &str); s += 2; }
319 else if ('i' == sub_type) { kputw(*(int32_t*)s, &str); s += 4; }
320 else if ('I' == sub_type) { kputuw(*(uint32_t*)s, &str); s += 4; }
321 else if ('f' == sub_type) { ksprintf(&str, "%g", *(float*)s); s += 4; }
328 char *bam_format1(const bam_header_t *header, const bam1_t *b)
330 return bam_format1_core(header, b, BAM_OFDEC);
333 void bam_view1(const bam_header_t *header, const bam1_t *b)
335 char *s = bam_format1(header, b);
340 int bam_validate1(const bam_header_t *header, const bam1_t *b)
344 if (b->core.tid < -1 || b->core.mtid < -1) return 0;
345 if (header && (b->core.tid >= header->n_targets || b->core.mtid >= header->n_targets)) return 0;
347 if (b->data_len < b->core.l_qname) return 0;
348 s = memchr(bam1_qname(b), '\0', b->core.l_qname);
349 if (s != &bam1_qname(b)[b->core.l_qname-1]) return 0;
351 // FIXME: Other fields could also be checked, especially the auxiliary data
356 // FIXME: we should also check the LB tag associated with each alignment
357 const char *bam_get_library(bam_header_t *h, const bam1_t *b)
360 if (h->dict == 0) h->dict = sam_header_parse2(h->text);
361 if (h->rg2lib == 0) h->rg2lib = sam_header2tbl(h->dict, "RG", "ID", "LB");
362 rg = bam_aux_get(b, "RG");
363 return (rg == 0)? 0 : sam_tbl_get(h->rg2lib, (const char*)(rg + 1));