/*
- *
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
#include "avio.h"
#include "url.h"
+#include "libavutil/log.h"
+
+extern const AVClass ff_avio_class;
+
int ffio_init_context(AVIOContext *s,
unsigned char *buffer,
int buffer_size,
int64_t (*seek)(void *opaque, int64_t offset, int whence));
+/**
+ * Read size bytes from AVIOContext, returning a pointer.
+ * Note that the data pointed at by the returned pointer is only
+ * valid until the next call that references the same IO context.
+ * @param s IO context
+ * @param buf pointer to buffer into which to assemble the requested
+ * data if it is not available in contiguous addresses in the
+ * underlying buffer
+ * @param size number of bytes requested
+ * @param data address at which to store pointer: this will be a
+ * a direct pointer into the underlying buffer if the requested
+ * number of bytes are available at contiguous addresses, otherwise
+ * will be a copy of buf
+ * @return number of bytes read or AVERROR
+ */
+int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data);
+
/**
* Read size bytes from AVIOContext into buf.
* This reads at most 1 packet. If that is not enough fewer bytes will be
uint64_t ffio_read_varlen(AVIOContext *bc);
+/**
+ * Read size bytes from AVIOContext into buf.
+ * Check that exactly size bytes have been read.
+ * @return number of bytes read or AVERROR
+ */
+int ffio_read_size(AVIOContext *s, unsigned char *buf, int size);
+
/** @warning must be called before any I/O */
int ffio_set_buf_size(AVIOContext *s, int buf_size);
unsigned long ffio_get_checksum(AVIOContext *s);
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
unsigned int len);
+unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
+ unsigned int len);
/**
* Open a write only packetized memory stream with a maximum packet
* size of 'max_packet_size'. The stream is stored in a memory buffer
- * with a big endian 4 byte header giving the packet size in bytes.
+ * with a big-endian 4 byte header giving the packet size in bytes.
*
* @param s new IO context
* @param max_packet_size maximum packet size (must be > 0)
*/
int ffio_fdopen(AVIOContext **s, URLContext *h);
+/**
+ * Open a write-only fake memory stream. The written data is not stored
+ * anywhere - this is only used for measuring the amount of data
+ * written.
+ *
+ * @param s new IO context
+ * @return zero if no error.
+ */
+int ffio_open_null_buf(AVIOContext **s);
+
+/**
+ * Close a null buffer.
+ *
+ * @param s an IO context opened by ffio_open_null_buf
+ * @return the number of bytes written to the null buffer
+ */
+int ffio_close_null_buf(AVIOContext *s);
+
+/**
+ * Free a dynamic buffer.
+ *
+ * @param s a pointer to an IO context opened by avio_open_dyn_buf()
+ */
+void ffio_free_dyn_buf(AVIOContext **s);
+
#endif /* AVFORMAT_AVIO_INTERNAL_H */