drop: ifdef __cplusplus checks from C files

the prototypes are already marked in the headers

Change-Id: I172fe742200c939ca32a70a2299809b8baf9b094

src/utils/alpha_processing.c

@@ -14,10 +14,6 @@
 #include <assert.h>
 #include "./alpha_processing.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 // Tables can be faster on some platform but incur some extra binary size (~2k).
 // #define USE_TABLES_FOR_ALPHA_MULT
 
@@ -198,6 +194,3 @@ void WebPMultRows(uint8_t* ptr, int stride,
 #undef HALF
 #undef MFIX
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/bit_reader.c

@@ -13,10 +13,6 @@
 
 #include "./bit_reader.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 #ifndef USE_RIGHT_JUSTIFY
 #define MK(X) (((range_t)(X) << (BITS)) | (MASK))
 #else
@@ -209,6 +205,3 @@ uint32_t VP8LReadBits(VP8LBitReader* const br, int n_bits) {
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/bit_writer.c

@@ -17,10 +17,6 @@
 #include <stdlib.h>
 #include "./bit_writer.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 //------------------------------------------------------------------------------
 // VP8BitWriter
 
@@ -284,6 +280,3 @@ void VP8LWriteBits(VP8LBitWriter* const bw, int n_bits, uint32_t bits) {
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/color_cache.c

@@ -16,10 +16,6 @@
 #include "./color_cache.h"
 #include "../utils/utils.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 //------------------------------------------------------------------------------
 // VP8LColorCache.
 
@@ -41,6 +37,3 @@ void VP8LColorCacheClear(VP8LColorCache* const cc) {
   }
 }
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}
-#endif

src/utils/filters.c

@@ -16,10 +16,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 //------------------------------------------------------------------------------
 // Helpful macro.
 
@@ -268,6 +264,3 @@ const WebPUnfilterFunc WebPUnfilters[WEBP_FILTER_LAST] = {
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/huffman.c

@@ -18,10 +18,6 @@
 #include "../utils/utils.h"
 #include "../webp/format_constants.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 // Uncomment the following to use look-up table for ReverseBits()
 // (might be faster on some platform)
 // #define USE_LUT_REVERSE_BITS
@@ -290,6 +286,3 @@ int HuffmanTreeBuildExplicit(HuffmanTree* const tree,
   return ok;
 }
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/quant_levels.c

@@ -16,10 +16,6 @@
 
 #include "./quant_levels.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 #define NUM_SYMBOLS     256
 
 #define MAX_ITER  6             // Maximum number of convergence steps.
@@ -142,6 +138,3 @@ int QuantizeLevels(uint8_t* const data, int width, int height,
   return 1;
 }
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/quant_levels_dec.c

@@ -13,10 +13,6 @@
 
 #include "./quant_levels_dec.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 int DequantizeLevels(uint8_t* const data, int width, int height,
                      int row, int num_rows) {
   if (data == NULL || width <= 0 || height <= 0 || row < 0 || num_rows < 0 ||
@@ -26,6 +22,3 @@ int DequantizeLevels(uint8_t* const data, int width, int height,
   return 1;
 }
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/random.c

@@ -14,10 +14,6 @@
 #include <string.h>
 #include "./random.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 //------------------------------------------------------------------------------
 
 // 31b-range values
@@ -45,6 +41,3 @@ void VP8InitRandom(VP8Random* const rg, float dithering) {
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/rescaler.c

@@ -17,10 +17,6 @@
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 #define RFIX 30
 #define MULT_FIX(x, y) (((int64_t)(x) * (y) + (1 << (RFIX - 1))) >> RFIX)
 
@@ -154,6 +150,3 @@ int WebPRescalerExport(WebPRescaler* const rescaler) {
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/thread.c

@@ -15,10 +15,6 @@
 #include <string.h>   // for memset()
 #include "./thread.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 #ifdef WEBP_USE_THREAD
 
 #if defined(_WIN32)
@@ -243,6 +239,3 @@ void WebPWorkerEnd(WebPWorker* const worker) {
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif

src/utils/utils.c

@@ -14,10 +14,6 @@
 #include <stdlib.h>
 #include "./utils.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 //------------------------------------------------------------------------------
 // Checked memory allocation
 
@@ -44,6 +40,3 @@ void* WebPSafeCalloc(uint64_t nmemb, size_t size) {
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif