dr_54: Various fixes

- add boundary checking
- add doxygen comment
- fix some typos.
- fix L1L2MERGE macro

src/descriptors/dr_54.c

@@ -64,6 +64,8 @@ dvbpsi_content_dr_t * dvbpsi_DecodeContentDr(
         return NULL;
 
     int i_contents_number = p_descriptor->i_length / 2;
+    if (i_contents_number > DVBPSI_CONTENT_DR_MAX)
+        i_contents_number = DVBPSI_CONTENT_DR_MAX;
     p_decoded->i_contents_number = i_contents_number;
 
     for (int i = 0; i < i_contents_number; i++)
@@ -85,6 +87,9 @@ dvbpsi_descriptor_t * dvbpsi_GenContentDr(
                                         dvbpsi_content_dr_t * p_decoded,
                                         bool b_duplicate)
 {
+    if (p_decoded->i_contents_number > DVBPSI_CONTENT_DR_MAX)
+        p_decoded->i_contents_number = DVBPSI_CONTENT_DR_MAX;
+
     /* Create the descriptor */
     dvbpsi_descriptor_t * p_descriptor =
             dvbpsi_NewDescriptor(0x54, p_decoded->i_contents_number * 2 , NULL);

src/descriptors/dr_54.h

@@ -34,9 +34,10 @@
 extern "C" {
 #endif
 
-#define DVDPSI_GetContentCategoryFromType(type) (type >> 4)
+#define DVDPSI_GetContentCategoryFromType(type) ((type) >> 4)
+
+#define L1L2MERGE(L1,L2) ( ( DVBPSI_CONTENT_CAT ## L1<<4) | (L2) )
 
-#define L1L2MERGE(L1,L2) ( ( DVBPSI_CONTENT ## L1<<4) | L2 )
 #define DVBPSI_CONTENT_CAT_UNDEFINED    0x0
 #define DVBPSI_CONTENT_CAT_MOVIE        0x1
 #define DVBPSI_CONTENT_CAT_NEWS         0x2
@@ -51,7 +52,7 @@ extern "C" {
 #define DVBPSI_CONTENT_CAT_SPECIAL      0xb
 #define DVBPSI_CONTENT_CAT_USERDEFINED  0xf
 
-                /* Movie/Drama */
+/* Movie/Drama */
 #define DVBPSI_CONTENT_MOVIE_GENERAL        L1L2MERGE( _MOVIE, 0x0 )
 #define DVBPSI_CONTENT_MOVIE_DETECTIVE      L1L2MERGE( _MOVIE, 0x1 )
 #define DVBPSI_CONTENT_MOVIE_ADVENTURE      L1L2MERGE( _MOVIE, 0x2 )
@@ -157,7 +158,6 @@ extern "C" {
 #define DVBPSI_CONTENT_SPECIAL_USERDEFINED2     L1L2MERGE( _SPECIAL, 0xd )
 #define DVBPSI_CONTENT_SPECIAL_USERDEFINED3     L1L2MERGE( _SPECIAL, 0xe )
 #define DVBPSI_CONTENT_SPECIAL_USERDEFINED4     L1L2MERGE( _SPECIAL, 0xf )
-#undef L1L2MERGE
 
 /*****************************************************************************
  * dvbpsi_content_t
@@ -180,6 +180,11 @@ typedef struct dvbpsi_content_s
 
 } dvbpsi_content_t;
 
+/*!
+ * \def DVBPSI_CONTENT_DR_MAX
+ * \brief Maximum number of dvbps_content_t entries present in @see dvbpsi_content_dr_t
+ */
+#define DVBPSI_CONTENT_DR_MAX 64
 
 /*****************************************************************************
  * dvbpsi_content_dr_t
@@ -198,7 +203,7 @@ typedef struct dvbpsi_content_s
 typedef struct dvbpsi_content_dr_s
 {
   uint8_t          i_contents_number;                /*!< number of content */
-  dvbpsi_content_t p_content[64];   /*!< parental rating table */
+  dvbpsi_content_t p_content[DVBPSI_CONTENT_DR_MAX]; /*!< parental rating table */
 
 } dvbpsi_content_dr_t;
 
@@ -241,6 +246,5 @@ dvbpsi_descriptor_t * dvbpsi_GenContentDr(
 #endif
 
 #else
-#error "Multiple inclusions of dr_55.h"
+#error "Multiple inclusions of dr_54.h"
 #endif
-