utils: Dedicated function for length/size

2 files changed, 46 insertions, 11 deletions

diff --git a/include/samsung-ipc.h b/include/samsung-ipc.h
index 5be2ac9..3aa6808 100644
--- a/include/samsung-ipc.h
+++ b/include/samsung-ipc.h
@@ -139,8 +139,10 @@ int sysfs_value_read(const char *path);
 int sysfs_value_write(const char *path, int value);
 char *sysfs_string_read(const char *path, size_t length);
 int sysfs_string_write(const char *path, const char *buffer, size_t length);
+size_t data2string_length(const void *data, size_t size);
 char *data2string(const void *data, size_t size);
-void *string2data(const char *string, size_t *size_p);
+size_t string2data_size(const char *string);
+void *string2data(const char *string);
 
 /*
  * Samsung-IPC protocol
diff --git a/samsung-ipc/utils.c b/samsung-ipc/utils.c
index d6481c2..d0cc059 100644
--- a/samsung-ipc/utils.c
+++ b/samsung-ipc/utils.c
@@ -331,6 +331,18 @@ complete:
     return rc;
 }
 
+size_t data2string_length(const void *data, size_t size)
+{
+    size_t length;
+
+    if (data == NULL || size == 0)
+        return 0;
+
+    length = size * 2 + 1;
+
+    return length;
+}
+
 char *data2string(const void *data, size_t size)
 {
     char *string;
@@ -341,7 +353,10 @@ char *data2string(const void *data, size_t size)
     if (data == NULL || size == 0)
         return NULL;
 
-    length = size * 2 + 1;
+    length = data2string_length(data, size);
+    if (length == 0)
+        return NULL;
+
     string = (char *) calloc(1, length);
 
     p = string;
@@ -354,7 +369,27 @@ char *data2string(const void *data, size_t size)
     return string;
 }
 
-void *string2data(const char *string, size_t *size_p)
+size_t string2data_size(const char *string)
+{
+    size_t length;
+    size_t size;
+
+    if (string == NULL)
+        return 0;
+
+    length = strlen(string);
+    if (length == 0)
+        return 0;
+
+    if (length % 2 == 0)
+        size = length / 2;
+    else
+        size = (length - (length % 2)) / 2 + 1;
+
+    return size;
+}
+
+void *string2data(const char *string)
 {
     void *data;
     size_t size;
@@ -372,13 +407,14 @@ void *string2data(const char *string, size_t *size_p)
     if (length == 0)
         return NULL;
 
-    if (length % 2 == 0) {
-        size = length / 2;
+    if (length % 2 == 0)
         shift = 0;
-    } else {
-        size = (length - (length % 2)) / 2 + 1;
+    else
         shift = 1;
-    }
+
+    size = string2data_size(string);
+    if (size == 0)
+        return NULL;
 
     data = calloc(1, size);
 
@@ -397,9 +433,6 @@ void *string2data(const char *string, size_t *size_p)
         shift++;
     }
 
-    if (size_p != NULL)
-        *size_p = size;
-
     return data;
 }