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/*
* Copying and distribution of this file, with or without modification,
* are permitted in any medium without royalty provided the copyright
* notice and this notice are preserved. This file is offered as-is,
* without any warranty.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "zstd.h"
#if defined(GNUTLS_ZSTD_ENABLE_DLOPEN) && GNUTLS_ZSTD_ENABLE_DLOPEN
#include <assert.h>
#include <dlfcn.h>
#include <errno.h>
#include <stdlib.h>
/* If ZSTD_LIBRARY_SONAME_UNUSED is defined, dlopen handle can be automatically
* set; otherwise, the caller needs to call
* gnutls_zstd_ensure_library with soname determined at run time.
*/
#ifdef ZSTD_LIBRARY_SONAME_UNUSED
static void
ensure_library (void)
{
if (gnutls_zstd_ensure_library (ZSTD_LIBRARY_SONAME_UNUSED, RTLD_LAZY | RTLD_LOCAL) < 0)
abort ();
}
#if defined(GNUTLS_ZSTD_ENABLE_PTHREAD) && GNUTLS_ZSTD_ENABLE_PTHREAD
#include <pthread.h>
static pthread_once_t dlopen_once = PTHREAD_ONCE_INIT;
#define ENSURE_LIBRARY pthread_once(&dlopen_once, ensure_library)
#else /* GNUTLS_ZSTD_ENABLE_PTHREAD */
#define ENSURE_LIBRARY do { \
if (!gnutls_zstd_dlhandle) \
ensure_library(); \
} while (0)
#endif /* !GNUTLS_ZSTD_ENABLE_PTHREAD */
#else /* ZSTD_LIBRARY_SONAME_UNUSED */
#define ENSURE_LIBRARY do {} while (0)
#endif /* !ZSTD_LIBRARY_SONAME_UNUSED */
static void *gnutls_zstd_dlhandle;
/* Define redirection symbols */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-macros"
#if (2 <= __GNUC__ || (4 <= __clang_major__))
#define FUNC(ret, name, args, cargs) \
static __typeof__(name)(*gnutls_zstd_sym_##name);
#else
#define FUNC(ret, name, args, cargs) \
static ret(*gnutls_zstd_sym_##name)args;
#endif
#define VOID_FUNC FUNC
#include "zstdfuncs.h"
#undef VOID_FUNC
#undef FUNC
#pragma GCC diagnostic pop
/* Define redirection wrapper functions */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-macros"
#define FUNC(ret, name, args, cargs) \
ret gnutls_zstd_func_##name args \
{ \
ENSURE_LIBRARY; \
assert (gnutls_zstd_sym_##name); \
return gnutls_zstd_sym_##name cargs; \
}
#define VOID_FUNC(ret, name, args, cargs) \
ret gnutls_zstd_func_##name args \
{ \
ENSURE_LIBRARY; \
assert (gnutls_zstd_sym_##name); \
gnutls_zstd_sym_##name cargs; \
}
#include "zstdfuncs.h"
#undef VOID_FUNC
#undef FUNC
#pragma GCC diagnostic pop
static int
ensure_symbol (const char *name, void **symp)
{
if (!*symp)
{
void *sym = dlsym (gnutls_zstd_dlhandle, name);
if (!sym)
return -EINVAL;
*symp = sym;
}
return 0;
}
int
gnutls_zstd_ensure_library (const char *soname, int flags)
{
int err;
if (!gnutls_zstd_dlhandle)
{
gnutls_zstd_dlhandle = dlopen (soname, flags);
if (!gnutls_zstd_dlhandle)
return -EINVAL;
}
#define ENSURE_SYMBOL(name) \
ensure_symbol(#name, (void **)&gnutls_zstd_sym_##name)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-macros"
#define FUNC(ret, name, args, cargs) \
err = ENSURE_SYMBOL(name); \
if (err < 0) \
{ \
dlclose (gnutls_zstd_dlhandle); \
gnutls_zstd_dlhandle = NULL; \
return err; \
}
#define VOID_FUNC FUNC
#include "zstdfuncs.h"
#undef VOID_FUNC
#undef FUNC
#pragma GCC diagnostic pop
#undef ENSURE_SYMBOL
return 0;
}
void
gnutls_zstd_unload_library (void)
{
if (gnutls_zstd_dlhandle)
{
dlclose (gnutls_zstd_dlhandle);
gnutls_zstd_dlhandle = NULL;
}
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-macros"
#define FUNC(ret, name, args, cargs) \
gnutls_zstd_sym_##name = NULL;
#define VOID_FUNC FUNC
#include "zstdfuncs.h"
#undef VOID_FUNC
#undef FUNC
#pragma GCC diagnostic pop
}
unsigned
gnutls_zstd_is_usable (void)
{
return gnutls_zstd_dlhandle != NULL;
}
#else /* GNUTLS_ZSTD_ENABLE_DLOPEN */
int
gnutls_zstd_ensure_library (const char *soname, int flags)
{
(void) soname;
(void) flags;
return 0;
}
void
gnutls_zstd_unload_library (void)
{
}
unsigned
gnutls_zstd_is_usable (void)
{
/* The library is linked at build time, thus always usable */
return 1;
}
#endif /* !GNUTLS_ZSTD_ENABLE_DLOPEN */
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