blowfish: add av_blowfish_alloc()

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

doc/APIchanges

@@ -13,6 +13,9 @@ libavutil:     2014-08-09
 
 API changes, most recent first:
 
+2015-xx-xx - lavu 54.17.0
+  xxxxxxx -  Add av_blowfish_alloc().
+
 2015-07-29 - 7e38340 - lavu 54.16.0 - hmac.h
   Add AV_HMAC_SHA224 and AV_HMAC_SHA256.
 

libavutil/blowfish.c

@@ -24,8 +24,18 @@
 #include "avutil.h"
 #include "common.h"
 #include "intreadwrite.h"
+#include "mem.h"
 #include "blowfish.h"
 
+#if !FF_API_CRYPTO_CONTEXT
+#define AV_BF_ROUNDS 16
+
+struct AVBlowfish {
+    uint32_t p[AV_BF_ROUNDS + 2];
+    uint32_t s[4][256];
+};
+#endif
+
 static const uint32_t orig_p[AV_BF_ROUNDS + 2] = {
     0x243F6A88, 0x85A308D3, 0x13198A2E, 0x03707344,
     0xA4093822, 0x299F31D0, 0x082EFA98, 0xEC4E6C89,
@@ -312,6 +322,11 @@ static void F(AVBlowfish *ctx, uint32_t *xl, uint32_t *xr, int i)
     *xr = Xl;
 }
 
+AVBlowfish *av_blowfish_alloc(void)
+{
+    return av_mallocz(sizeof(struct AVBlowfish));
+}
+
 av_cold void av_blowfish_init(AVBlowfish *ctx, const uint8_t *key, int key_len)
 {
     uint32_t data, data_l, data_r;

libavutil/blowfish.h

@@ -22,6 +22,7 @@
 #define AVUTIL_BLOWFISH_H
 
 #include <stdint.h>
+#include "version.h"
 
 /**
  * @defgroup lavu_blowfish Blowfish
@@ -29,12 +30,21 @@
  * @{
  */
 
+#if FF_API_CRYPTO_CONTEXT
 #define AV_BF_ROUNDS 16
 
 typedef struct AVBlowfish {
     uint32_t p[AV_BF_ROUNDS + 2];
     uint32_t s[4][256];
 } AVBlowfish;
+#else
+typedef struct AVBlowfish AVBlowfish;
+#endif
+
+/**
+ * Allocate an AVBlowfish context.
+ */
+AVBlowfish *av_blowfish_alloc(void);
 
 /**
  * Initialize an AVBlowfish context.

libavutil/version.h

@@ -54,7 +54,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR 54
-#define LIBAVUTIL_VERSION_MINOR 16
+#define LIBAVUTIL_VERSION_MINOR 17
 #define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
@@ -114,6 +114,9 @@
 #ifndef FF_API_DLOG
 #define FF_API_DLOG                     (LIBAVUTIL_VERSION_MAJOR < 55)
 #endif
+#ifndef FF_API_CRYPTO_CONTEXT
+#define FF_API_CRYPTO_CONTEXT           (LIBAVUTIL_VERSION_MAJOR < 56)
+#endif
 
 
 /**