smackerdemuxer: check some values before instead of just after malloc()

[ffmpeg] / libavformat / avio.h

diff --git a/libavformat/avio.h b/libavformat/avio.h
index 8210cbd1da92401bd868a14f44d10b5da90a6fe1..7cf14f9f8c87a888c1b86de9602dc3f2f35a6c0b 100644 (file)
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -22,12 +22,14 @@
 
 /**
  * @file
+ * @ingroup lavf_io
  * Buffered I/O operations
  */
 
 #include <stdint.h>
 
 #include "libavutil/common.h"
+#include "libavutil/dict.h"
 #include "libavutil/log.h"
 
 #include "libavformat/version.h"
@@ -35,6 +37,22 @@
 
 #define AVIO_SEEKABLE_NORMAL 0x0001 /**< Seeking works like for a local file */
 
+/**
+ * Callback for checking whether to abort blocking functions.
+ * AVERROR_EXIT is returned in this case by the interrupted
+ * function. During blocking operations, callback is called with
+ * opaque as parameter. If the callback returns 1, the
+ * blocking operation will be aborted.
+ *
+ * No members can be added to this struct without a major bump, if
+ * new elements have been added after this struct in AVFormatContext
+ * or AVIOContext.
+ */
+typedef struct {
+    int (*callback)(void*);
+    void *opaque;
+} AVIOInterruptCB;
+
 /**
  * Bytestream IO Context.
  * New fields can be added to the end with minor version bumps.
@@ -48,6 +66,21 @@
  *       function pointers specified in avio_alloc_context()
  */
 typedef struct {
+#if !FF_API_OLD_AVIO
+    /**
+     * A class for private options.
+     *
+     * If this AVIOContext is created by avio_open2(), av_class is set and
+     * passes the options down to protocols.
+     *
+     * If this AVIOContext is manually allocated, then av_class may be set by
+     * the caller.
+     *
+     * warning -- this field can be NULL, be sure to not pass this AVIOContext
+     * to any av_opt_* functions in that case.
+     */
+    AVClass *av_class;
+#endif
     unsigned char *buffer;  /**< Start of the buffer. */
     int buffer_size;        /**< Maximum buffer size */
     unsigned char *buf_ptr; /**< Current position in the buffer */
@@ -109,6 +142,7 @@ typedef struct URLContext {
     void *priv_data;
     char *filename; /**< specified URL */
     int is_connected;
+    AVIOInterruptCB interrupt_callback;
 } URLContext;
 
 #define URL_PROTOCOL_FLAG_NESTED_SCHEME 1 /*< The protocol name can be the first part of a nested protocol scheme */
@@ -178,6 +212,7 @@ extern URLInterruptCB *url_interrupt_cb;
  * @defgroup old_url_funcs Old url_* functions
  * The following functions are deprecated. Use the buffered API based on #AVIOContext instead.
  * @{
+ * @ingroup lavf_io
  */
 attribute_deprecated int url_open_protocol (URLContext **puc, struct URLProtocol *up,
                                             const char *url, int flags);
@@ -238,6 +273,7 @@ attribute_deprecated AVIOContext *av_alloc_put_byte(
  * @defgroup old_avio_funcs Old put_/get_*() functions
  * The following functions are deprecated. Use the "avio_"-prefixed functions instead.
  * @{
+ * @ingroup lavf_io
  */
 attribute_deprecated int          get_buffer(AVIOContext *s, unsigned char *buf, int size);
 attribute_deprecated int          get_partial_buffer(AVIOContext *s, unsigned char *buf, int size);
@@ -275,6 +311,7 @@ attribute_deprecated int64_t av_url_read_fseek (AVIOContext *h,    int stream_in
  * @defgroup old_url_f_funcs Old url_f* functions
  * The following functions are deprecated, use the "avio_"-prefixed functions instead.
  * @{
+ * @ingroup lavf_io
  */
 attribute_deprecated int url_fopen( AVIOContext **s, const char *url, int flags);
 attribute_deprecated int url_fclose(AVIOContext *s);
@@ -353,13 +390,17 @@ attribute_deprecated int url_exist(const char *url);
  */
 int avio_check(const char *url, int flags);
 
+#if FF_API_OLD_INTERRUPT_CB
 /**
  * The callback is called in blocking functions to test regulary if
  * asynchronous interruption is needed. AVERROR_EXIT is returned
  * in this case by the interrupted function. 'NULL' means no interrupt
  * callback is given.
+ * @deprecated Use interrupt_callback in AVFormatContext/avio_open2
+ *             instead.
  */
-void avio_set_interrupt_cb(int (*interrupt_cb)(void));
+attribute_deprecated void avio_set_interrupt_cb(int (*interrupt_cb)(void));
+#endif
 
 /**
  * Allocate and initialize an AVIOContext for buffered I/O. It must be later
@@ -556,6 +597,26 @@ int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen);
  */
 int avio_open(AVIOContext **s, const char *url, int flags);
 
+/**
+ * Create and initialize a AVIOContext for accessing the
+ * resource indicated by url.
+ * @note When the resource indicated by url has been opened in
+ * read+write mode, the AVIOContext can be used only for writing.
+ *
+ * @param s Used to return the pointer to the created AVIOContext.
+ * In case of failure the pointed to value is set to NULL.
+ * @param flags flags which control how the resource indicated by url
+ * is to be opened
+ * @param int_cb an interrupt callback to be used at the protocols level
+ * @param options  A dictionary filled with protocol-private options. On return
+ * this parameter will be destroyed and replaced with a dict containing options
+ * that were not found. May be NULL.
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ */
+int avio_open2(AVIOContext **s, const char *url, int flags,
+               const AVIOInterruptCB *int_cb, AVDictionary **options);
+
 /**
  * Close the resource accessed by the AVIOContext s and free it.
  * This function can only be used if s was opened by avio_open().