avformat/aviobuf: Return better error codes

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/aviobuf.c

@@ -708,7 +708,7 @@ int avio_read_partial(AVIOContext *s, unsigned char *buf, int size)
     int len;
 
     if (size < 0)
-        return -1;
+        return AVERROR(EINVAL);
 
     if (s->read_packet && s->write_flag) {
         len = read_packet_wrapper(s, buf, size);
@@ -1289,7 +1289,7 @@ static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
     /* reallocate buffer if needed */
     new_size = (unsigned)d->pos + buf_size;
     if (new_size < d->pos || new_size > INT_MAX)
-        return -1;
+        return AVERROR(ERANGE);
     if (new_size > d->allocated_size) {
         unsigned new_allocated_size = d->allocated_size ? d->allocated_size
                                                         : new_size;
@@ -1336,8 +1336,10 @@ static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
         offset += d->pos;
     else if (whence == SEEK_END)
         offset += d->size;
-    if (offset < 0 || offset > 0x7fffffffLL)
-        return -1;
+    if (offset < 0)
+        return AVERROR(EINVAL);
+    if (offset > INT_MAX)
+        return AVERROR(ERANGE);
     d->pos = offset;
     return 0;
 }
@@ -1348,7 +1350,7 @@ static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
     unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
 
     if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
-        return -1;
+        return AVERROR(ERANGE);
     d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
     if (!d)
         return AVERROR(ENOMEM);
@@ -1372,7 +1374,7 @@ int avio_open_dyn_buf(AVIOContext **s)
 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
 {
     if (max_packet_size <= 0)
-        return -1;
+        return AVERROR(EINVAL);
     return url_open_dyn_buf_internal(s, max_packet_size);
 }