Add get_version functionality to liberasurecode lib

Currently, we have liberasurecode version info in the header and pyeclib
is using the info to detect the version. However it's a bit painful
because it requires to rebuild pyeclib c code for you to see the actual
installed version.

This addition for liberasurecode_get_version enables caller to get the
version integer from compiled shared library file (.so) and it will
rescure to re-compiled operation from pyeclib.

Change-Id: I8161ea7da3b069e83c93e11cb41ce12fa60c6f32

3 files changed, 27 insertions, 0 deletions

diff --git a/include/erasurecode/erasurecode.h b/include/erasurecode/erasurecode.h
index a17c45c..e5a6c93 100644
--- a/include/erasurecode/erasurecode.h
+++ b/include/erasurecode/erasurecode.h
@@ -375,6 +375,14 @@ int liberasurecode_get_minimum_encode_size(int desc);
  */
 int liberasurecode_get_fragment_size(int desc, int data_len);
 
+/**
+ * This will return the liberasurecode version for the descriptor
+ *
+ * @return version uint32_t - from erasurecode_version.h
+ */
+
+uint32_t liberasurecode_get_version();
+
 /* ==~=*=~===~=*=~==~=*=~== liberasurecode Error codes =~=*=~==~=~=*=~==~== */
 
 /* Error codes */
diff --git a/src/erasurecode.c b/src/erasurecode.c
index d3b3cea..4f3419c 100644
--- a/src/erasurecode.c
+++ b/src/erasurecode.c
@@ -1232,6 +1232,16 @@ int liberasurecode_get_fragment_size(int desc, int data_len)
     return size;
 }
 
+
+/**
+ * This will return the liberasurecode version for the descriptor
+ */
+
+uint32_t liberasurecode_get_version()
+{
+    return LIBERASURECODE_VERSION;
+}
+
 /* ==~=*=~==~=*=~==~=*=~==~=*=~==~=* misc *=~==~=*=~==~=*=~==~=*=~==~=*=~== */
 
 #if 0
diff --git a/test/liberasurecode_test.c b/test/liberasurecode_test.c
index 386d49f..3a6cf36 100644
--- a/test/liberasurecode_test.c
+++ b/test/liberasurecode_test.c
@@ -903,6 +903,11 @@ static void test_get_fragment_partition()
     free(orig_data);
 }
 
+static void test_liberasurecode_get_version(){
+    uint32_t version = liberasurecode_get_version();
+    assert(version == LIBERASURECODE_VERSION);
+}
+
 static void encode_decode_test_impl(const ec_backend_id_t be_id,
                                    struct ec_args *args,
                                    int *skip)
@@ -1694,6 +1699,10 @@ struct testcase testcases[] = {
         test_get_fragment_partition,
         EC_BACKENDS_MAX, CHKSUM_TYPES_MAX,
         .skip = false},
+    {"test_liberasurecode_get_version",
+        test_liberasurecode_get_version,
+        EC_BACKENDS_MAX, CHKSUM_TYPES_MAX,
+        .skip = false},
     // NULL backend test
     {"create_and_destroy_backend",
         test_create_and_destroy_backend,