--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include "bgzf.h"
+#include "bam.h"
+
+#define BUF_SIZE 0x10000
+
+int bam_reheader(BGZF *in, const bam_header_t *h, int fd)
+{
+ BGZF *fp;
+ bam_header_t *old;
+ int len;
+ uint8_t *buf;
+ if (in->open_mode != 'r') return -1;
+ buf = malloc(BUF_SIZE);
+ old = bam_header_read(in);
+ fp = bgzf_fdopen(fd, "w");
+ bam_header_write(fp, h);
+ if (in->block_offset < in->block_length) {
+ bgzf_write(fp, in->uncompressed_block + in->block_offset, in->block_length - in->block_offset);
+ bgzf_flush(fp);
+ }
+#ifdef _USE_KNETFILE
+ while ((len = knet_read(in->x.fpr, buf, BUF_SIZE)) > 0)
+#else
+ while (!feof(in->file) && (len = fread(buf, 1, BUF_SIZE, in->file)) > 0)
+#endif
+ fwrite(buf, 1, len, fp->x.fpw);
+ free(buf);
+ fp->block_offset = in->block_offset = 0;
+ bgzf_close(fp);
+ return 0;
+}
+
+int main_reheader(int argc, char *argv[])
+{
+ bam_header_t *h;
+ BGZF *in;
+ if (argc != 3) {
+ fprintf(stderr, "Usage: samtools reheader <in.header.sam> <in.bam>\n");
+ return 1;
+ }
+ { // read the header
+ tamFile fph = sam_open(argv[1]);
+ if (fph == 0) {
+ fprintf(stderr, "[%s] fail to read the header from %s.\n", __func__, argv[1]);
+ return 1;
+ }
+ h = sam_header_read(fph);
+ sam_close(fph);
+ }
+ in = strcmp(argv[2], "-")? bam_open(argv[2], "r") : bam_dopen(fileno(stdin), "r");
+ if (in == 0) {
+ fprintf(stderr, "[%s] fail to open file %s.\n", __func__, argv[2]);
+ return 1;
+ }
+ bam_reheader(in, h, fileno(stdout));
+ bgzf_close(in);
+ return 0;
+}