[FFmpeg-devel] [PATCH v2 02/22] avformat/avio: Don't use incompatible function pointer type for call

[Andreas Rheinhardt]

It is undefined behaviour even in cases where it works
(it works because it is only a const uint8_t* vs. uint8_t* difference).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>
---
 libavformat/avio.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/libavformat/avio.c b/libavformat/avio.c
index ab1c19a58d..d53da5cb0c 100644
--- a/libavformat/avio.c
+++ b/libavformat/avio.c
@@ -354,10 +354,15 @@ fail:
 }
 
 static inline int retry_transfer_wrapper(URLContext *h, uint8_t *buf,
+                                         const uint8_t *cbuf,
                                          int size, int size_min,
-                                         int (*transfer_func)(URLContext *h,
-                                                              uint8_t *buf,
-                                                              int size))
+                                         int (*read_func)(URLContext *h,
+                                                          uint8_t *buf,
+                                                          int size),
+                                         int (*write_func)(URLContext *h,
+                                                           const uint8_t *buf,
+                                                           int size),
+                                         int read)
 {
     int ret, len;
     int fast_retries = 5;
@@ -367,7 +372,8 @@ static inline int retry_transfer_wrapper(URLContext *h, uint8_t *buf,
     while (len < size_min) {
         if (ff_check_interrupt(&h->interrupt_callback))
             return AVERROR_EXIT;
-        ret = transfer_func(h, buf + len, size - len);
+        ret = read ? read_func (h,  buf + len, size - len)
+                   : write_func(h, cbuf + len, size - len);
         if (ret == AVERROR(EINTR))
             continue;
         if (h->flags & AVIO_FLAG_NONBLOCK)
@@ -402,14 +408,16 @@ int ffurl_read(URLContext *h, unsigned char *buf, int size)
 {
     if (!(h->flags & AVIO_FLAG_READ))
         return AVERROR(EIO);
-    return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
+    return retry_transfer_wrapper(h, buf, NULL, size, 1,
+                                  h->prot->url_read, NULL, 1);
 }
 
 int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
 {
     if (!(h->flags & AVIO_FLAG_READ))
         return AVERROR(EIO);
-    return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
+    return retry_transfer_wrapper(h, buf, NULL, size, size,
+                                  h->prot->url_read, NULL, 1);
 }
 
 int ffurl_write(URLContext *h, const unsigned char *buf, int size)
@@ -420,9 +428,8 @@ int ffurl_write(URLContext *h, const unsigned char *buf, int size)
     if (h->max_packet_size && size > h->max_packet_size)
         return AVERROR(EIO);
 
-    return retry_transfer_wrapper(h, (unsigned char *)buf, size, size,
-                                  (int (*)(struct URLContext *, uint8_t *, int))
-                                  h->prot->url_write);
+    return retry_transfer_wrapper(h, NULL, buf, size, size,
+                                  NULL, h->prot->url_write, 0);
 }
 
 int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
-- 
2.34.1