converting bcf 1st phase data as in v44

Makefile

@@ -267,6 +267,7 @@ NONCONFIGURE_OBJS = hfile_libcurl.o
 PLUGIN_EXT  =
 PLUGIN_OBJS =
 
+bgzf_internal_h = bgzf_internal.h $(htslib_bgzf_h)
 cram_h = cram/cram.h $(cram_samtools_h) $(header_h) $(cram_structs_h) $(cram_io_h) cram/cram_encode.h cram/cram_decode.h cram/cram_stats.h cram/cram_codecs.h cram/cram_index.h $(htslib_cram_h)
 cram_io_h = cram/cram_io.h $(cram_misc_h)
 cram_misc_h = cram/misc.h
@@ -487,7 +488,7 @@ hts-object-files: $(LIBHTS_OBJS)
 	$(CC) -shared $(LDFLAGS) -o $@ $< hts.dll.a $(LIBS)
 
 
-bgzf.o bgzf.pico: bgzf.c config.h $(htslib_hts_h) $(htslib_bgzf_h) $(htslib_hfile_h) $(htslib_thread_pool_h) $(htslib_hts_endian_h) cram/pooled_alloc.h $(hts_internal_h) $(htslib_khash_h)
+bgzf.o bgzf.pico: bgzf.c config.h $(htslib_hts_h) $(htslib_bgzf_h) $(htslib_hfile_h) $(htslib_thread_pool_h) $(htslib_hts_endian_h) cram/pooled_alloc.h $(hts_internal_h) $(bgzf_internal_h) $(htslib_khash_h)
 errmod.o errmod.pico: errmod.c config.h $(htslib_hts_h) $(htslib_ksort_h) $(htslib_hts_os_h)
 kstring.o kstring.pico: kstring.c config.h $(htslib_kstring_h)
 header.o header.pico: header.c config.h $(textutils_internal_h) $(header_h)
@@ -499,7 +500,7 @@ hfile_s3.o hfile_s3.pico: hfile_s3.c config.h $(hfile_internal_h) $(htslib_hts_h
 hts.o hts.pico: hts.c config.h os/lzma_stub.h $(htslib_hts_h) $(htslib_bgzf_h) $(cram_h) $(htslib_hfile_h) $(htslib_hts_endian_h) version.h config_vars.h $(hts_internal_h) $(hfile_internal_h) $(sam_internal_h) $(htslib_hts_expr_h) $(htslib_hts_os_h) $(htslib_khash_h) $(htslib_kseq_h) $(htslib_ksort_h) $(htslib_tbx_h) $(htscodecs_htscodecs_h)
 hts_expr.o hts_expr.pico: hts_expr.c config.h $(htslib_hts_expr_h) $(htslib_hts_log_h) $(textutils_internal_h)
 hts_os.o hts_os.pico: hts_os.c config.h $(htslib_hts_defs_h) os/rand.c
-vcf.o vcf.pico: vcf.c config.h $(fuzz_settings_h) $(htslib_vcf_h) $(htslib_bgzf_h) $(htslib_tbx_h) $(htslib_hfile_h) $(hts_internal_h) $(htslib_khash_str2int_h) $(htslib_kstring_h) $(htslib_sam_h) $(htslib_khash_h) $(htslib_kseq_h) $(htslib_hts_endian_h)
+vcf.o vcf.pico: vcf.c config.h $(fuzz_settings_h) $(htslib_vcf_h) $(htslib_bgzf_h) $(htslib_tbx_h) $(htslib_hfile_h) $(hts_internal_h) $(htslib_khash_str2int_h) $(htslib_kstring_h) $(htslib_sam_h) $(htslib_khash_h) $(htslib_kseq_h) $(htslib_hts_endian_h) $(bgzf_internal_h)
 sam.o sam.pico: sam.c config.h $(fuzz_settings_h) $(htslib_hts_defs_h) $(htslib_sam_h) $(htslib_bgzf_h) $(cram_h) $(hts_internal_h) $(sam_internal_h) $(htslib_hfile_h) $(htslib_hts_endian_h) $(htslib_hts_expr_h) $(header_h) $(htslib_khash_h) $(htslib_kseq_h) $(htslib_kstring_h)
 sam_mods.o sam_mods.pico: sam_mods.c config.h $(htslib_sam_h) $(textutils_internal_h)
 simd.o simd.pico: simd.c config.h $(htslib_sam_h) $(sam_internal_h)

bgzf.c

@@ -48,12 +48,13 @@
 #include "htslib/hts_endian.h"
 #include "cram/pooled_alloc.h"
 #include "hts_internal.h"
+#include "bgzf_internal.h"
+#include "htslib/khash.h"
 
 #ifndef EFTYPE
 #define EFTYPE ENOEXEC
 #endif
 
-#define BGZF_CACHE
 #define BGZF_MT
 
 #define BLOCK_HEADER_LENGTH 18
@@ -76,21 +77,15 @@
 */
 static const uint8_t g_magic[19] = "\037\213\010\4\0\0\0\0\0\377\6\0\102\103\2\0\0\0";
 
-#ifdef BGZF_CACHE
 typedef struct {
     int size;
     uint8_t *block;
     int64_t end_offset;
 } cache_t;
 
-#include "htslib/khash.h"
-KHASH_MAP_INIT_INT64(cache, cache_t)
-#endif
+KHASH_MAP_INIT_INT64(bgzf_cache, cache_t)
 
-struct bgzf_cache_t {
-    khash_t(cache) *h;
-    khint_t last_pos;
-};
+// struct bgzf_cache_t is defined in bgzf_internal.h
 
 #ifdef BGZF_MT
 
@@ -409,20 +404,21 @@ static BGZF *bgzf_read_init(hFILE *hfpr, const char *filename)
         errno = EFTYPE;
         return NULL;
     }
-#ifdef BGZF_CACHE
+
     if (!(fp->cache = malloc(sizeof(*fp->cache)))) {
         free(fp->uncompressed_block);
         free(fp);
         return NULL;
     }
-    if (!(fp->cache->h = kh_init(cache))) {
+    if (!(fp->cache->h = kh_init(bgzf_cache))) {
         free(fp->uncompressed_block);
         free(fp->cache);
         free(fp);
         return NULL;
     }
     fp->cache->last_pos = 0;
-#endif
+    fp->cache->private_data = NULL;
+    fp->cache->private_data_cleanup = (bgzf_private_data_cleanup_func *) NULL;
     return fp;
 }
 
@@ -442,6 +438,15 @@ static BGZF *bgzf_write_init(const char *mode)
     fp = (BGZF*)calloc(1, sizeof(BGZF));
     if (fp == NULL) goto mem_fail;
     fp->is_write = 1;
+
+    fp->cache = malloc(sizeof(bgzf_cache_t));
+    if (!fp->cache)
+        goto mem_fail;
+    fp->cache->h = NULL;
+    fp->cache->last_pos = 0;
+    fp->cache->private_data = NULL;
+    fp->cache->private_data_cleanup = (bgzf_private_data_cleanup_func *) NULL;
+
     int compress_level = mode2level(mode);
     if ( compress_level==-2 )
     {
@@ -479,6 +484,7 @@ static BGZF *bgzf_write_init(const char *mode)
 
 fail:
     if (fp != NULL) {
+        free(fp->cache);
         free(fp->uncompressed_block);
         free(fp->gz_stream);
         free(fp);
@@ -896,15 +902,16 @@ static int check_header(const uint8_t *header)
             && unpackInt16((uint8_t*)&header[14]) == 2) ? 0 : -1;
 }
 
-#ifdef BGZF_CACHE
 static void free_cache(BGZF *fp)
 {
     khint_t k;
-    if (fp->is_write) return;
-    khash_t(cache) *h = fp->cache->h;
-    for (k = kh_begin(h); k < kh_end(h); ++k)
-        if (kh_exist(h, k)) free(kh_val(h, k).block);
-    kh_destroy(cache, h);
+    if (fp->cache->h) {
+        khash_t(bgzf_cache) *h = fp->cache->h;
+        for (k = kh_begin(h); k < kh_end(h); ++k)
+            if (kh_exist(h, k)) free(kh_val(h, k).block);
+        kh_destroy(bgzf_cache, h);
+    }
+    bgzf_clear_private_data(fp);
     free(fp->cache);
 }
 
@@ -913,8 +920,8 @@ static int load_block_from_cache(BGZF *fp, int64_t block_address)
     khint_t k;
     cache_t *p;
 
-    khash_t(cache) *h = fp->cache->h;
-    k = kh_get(cache, h, block_address);
+    khash_t(bgzf_cache) *h = fp->cache->h;
+    k = kh_get(bgzf_cache, h, block_address);
     if (k == kh_end(h)) return 0;
     p = &kh_val(h, k);
     if (fp->block_length != 0) fp->block_offset = 0;
@@ -937,7 +944,7 @@ static void cache_block(BGZF *fp, int size)
     uint8_t *block = NULL;
     cache_t *p;
     //fprintf(stderr, "Cache block at %llx\n", (int)fp->block_address);
-    khash_t(cache) *h = fp->cache->h;
+    khash_t(bgzf_cache) *h = fp->cache->h;
     if (BGZF_MAX_BLOCK_SIZE >= fp->cache_size) return;
     if (fp->block_length < 0 || fp->block_length > BGZF_MAX_BLOCK_SIZE) return;
     if ((kh_size(h) + 1) * BGZF_MAX_BLOCK_SIZE > (uint32_t)fp->cache_size) {
@@ -959,13 +966,13 @@ static void cache_block(BGZF *fp, int size)
 
         if (k != k_orig) {
             block = kh_val(h, k).block;
-            kh_del(cache, h, k);
+            kh_del(bgzf_cache, h, k);
         }
     } else {
         block = (uint8_t*)malloc(BGZF_MAX_BLOCK_SIZE);
     }
     if (!block) return;
-    k = kh_put(cache, h, fp->block_address, &ret);
+    k = kh_put(bgzf_cache, h, fp->block_address, &ret);
     if (ret <= 0) { // kh_put failed, or in there already (shouldn't happen)
         free(block);
         return;
@@ -976,11 +983,6 @@ static void cache_block(BGZF *fp, int size)
     p->block = block;
     memcpy(p->block, fp->uncompressed_block, p->size);
 }
-#else
-static void free_cache(BGZF *fp) {}
-static int load_block_from_cache(BGZF *fp, int64_t block_address) {return 0;}
-static void cache_block(BGZF *fp, int size) {}
-#endif
 
 /*
  * Absolute htell in this compressed file.

bgzf_internal.h

@@ -0,0 +1,70 @@
+/*  bgzf_internal.h -- internal bgzf functions; not part of the public API.
+
+    Copyright (C) 2025 Genome Research Ltd.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.  */
+
+#include <assert.h>
+#include "htslib/bgzf.h"
+
+/*
+ * BGZF private data interface
+ * This exists so that we can pass BCF headers into interfaces that have
+ * traditionally only taken a BGZF pointer without a corresponding bcf_hdr_t *,
+ * notably the bcf_readrec() function used by BCF iterators.
+ *
+ * To preserve the BGZF API and ABI, this is tagged on to the existing
+ * opaque bgzf_cache_t structure.  bgzf_cache_t is now defined here so we can
+ * inline lookups.
+ */
+
+typedef void bgzf_private_data_cleanup_func(void *private_data);
+
+struct kh_bgzf_cache_s;
+
+struct bgzf_cache_t {
+    struct kh_bgzf_cache_s *h;
+    unsigned int last_pos;
+    void *private_data;
+    bgzf_private_data_cleanup_func *private_data_cleanup;
+};
+
+// Set private data.  cleanup will be called on bgzf_close() or
+// bgzf_clear_private_data();
+
+static inline void bgzf_set_private_data(BGZF *fp, void *private_data,
+                                         bgzf_private_data_cleanup_func *fn) {
+    assert(fp->cache != NULL);
+    fp->cache->private_data = private_data;
+    fp->cache->private_data_cleanup = fn;
+}
+
+static inline void bgzf_clear_private_data(BGZF *fp) {
+    assert(fp->cache != NULL);
+    if (fp->cache->private_data) {
+        if (fp->cache->private_data_cleanup)
+            fp->cache->private_data_cleanup(fp->cache->private_data);
+        fp->cache->private_data = NULL;
+    }
+}
+
+static inline void * bgzf_get_private_data(BGZF *fp) {
+    assert(fp->cache != NULL);
+    return fp->cache->private_data;
+}