From b9cd0c6a53a6f6c4c4520748b860693306fbdb23 Mon Sep 17 00:00:00 2001
From: Gerhard Sittig <gerhard.sittig@gmx.net>
Date: Sun, 13 Aug 2017 17:41:38 +0200
Subject: [PATCH] configure: hook up minilzo to the libsigrok build, reflect
 its version

Add the minilzo/ directory to the list of source files for the libsigrok
build. Have the minilzo library use the project's config.h file, extend
the set of autoconf checks. This approach follows the documentation in
the README.LZO file. It avoids the dependency on an external library and
its version or configuration.

Reflect the minilzo version in the libsigrok version output. The example
application which ships with the library suggests that failed init calls
typically originate from compile issues. Present the same error message
to sigrok users as the example application does.
---
 Makefile.am   |  7 ++++++-
 configure.ac  | 21 +++++++++++++++++++++
 src/backend.c | 13 +++++++++++++
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index 4b05175b..4557677a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -42,7 +42,8 @@ AM_CPPFLAGS = $(local_includes) $(global_defs)
 
 # The tests CFLAGS are a superset of the libsigrok CFLAGS, and the
 # python bindings CFLAGS are a superset of the C++ bindings CFLAGS.
-AM_CFLAGS = $(SR_EXTRA_CFLAGS) $(SR_WFLAGS) $(TESTS_CFLAGS)
+SR_MINILZO_CFLAGS = -DMINILZO_HAVE_CONFIG_H
+AM_CFLAGS = $(SR_EXTRA_CFLAGS) $(SR_WFLAGS) $(SR_MINILZO_CFLAGS) $(TESTS_CFLAGS)
 AM_CXXFLAGS = $(SR_WXXFLAGS) $(LIBSIGROKCXX_CFLAGS)
 
 lib_LTLIBRARIES = libsigrok.la
@@ -70,6 +71,10 @@ libsigrok_la_SOURCES = \
 	src/std.c \
 	src/sw_limits.c
 
+# Support code, shared among input and driver modules
+libsigrok_la_SOURCES += \
+	src/minilzo/minilzo.c
+
 # Input modules
 libsigrok_la_SOURCES += \
 	src/input/input.c \
diff --git a/configure.ac b/configure.ac
index 6a92e097..982f5430 100644
--- a/configure.ac
+++ b/configure.ac
@@ -213,6 +213,27 @@ AM_CONDITIONAL([NEED_RPC], [test "x$sr_cv_have_rpc" = xyes])
 # Check for compiler support of 128 bit integers
 AC_CHECK_TYPES([__int128_t, __uint128_t], [], [], [])
 
+
+#######################
+##  miniLZO related  ##
+#######################
+# These were taken from the README.LZO file in the miniLZO archive.
+
+AC_CHECK_TYPE(ptrdiff_t,long)
+AC_TYPE_SIZE_T
+AC_CHECK_SIZEOF(short)
+AC_CHECK_SIZEOF(int)
+AC_CHECK_SIZEOF(long)
+AC_CHECK_SIZEOF(long long)
+AC_CHECK_SIZEOF(__int64)
+AC_CHECK_SIZEOF(void *)
+AC_CHECK_SIZEOF(size_t)
+AC_CHECK_SIZEOF(ptrdiff_t)
+
+AC_C_CONST
+
+AC_CHECK_FUNCS(memcmp memcpy memmove memset)
+
 ########################
 ##  Hardware drivers  ##
 ########################
diff --git a/src/backend.c b/src/backend.c
index 47180031..79340822 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -25,6 +25,7 @@
 #endif
 #include <libsigrok/libsigrok.h>
 #include "libsigrok-internal.h"
+#include "minilzo/minilzo.h"
 
 /** @cond PRIVATE */
 #define LOG_PREFIX "backend"
@@ -140,6 +141,10 @@ SR_API GSList *sr_buildinfo_libs_get(void)
 	m = g_slist_append(m, g_strdup_printf("%s", CONF_LIBZIP_VERSION));
 	l = g_slist_append(l, m);
 
+	m = g_slist_append(NULL, g_strdup("minilzo"));
+	m = g_slist_append(m, g_strdup_printf("%s", lzo_version_string()));
+	l = g_slist_append(l, m);
+
 #ifdef HAVE_LIBSERIALPORT
 	m = g_slist_append(NULL, g_strdup("libserialport"));
 	m = g_slist_append(m, g_strdup_printf("%s/%s (rt: %s/%s)",
@@ -594,6 +599,14 @@ SR_API int sr_init(struct sr_context **ctx)
 	}
 #endif
 
+	if ((ret = lzo_init()) != LZO_E_OK) {
+		sr_err("lzo_init() failed with return code %d.", ret);
+		sr_err("This usually indicates a compiler bug. Recompile without");
+		sr_err("optimizations, and enable '-DLZO_DEBUG' for diagnostics.");
+		ret = SR_ERR;
+		goto done;
+	}
+
 #ifdef HAVE_LIBUSB_1_0
 	ret = libusb_init(&context->libusb_ctx);
 	if (LIBUSB_SUCCESS != ret) {
-- 
2.30.2