In-memory byte streams

In-memory byte stream are a portable wrapper for in-memory formatted output byte streams. More...

Collaboration diagram for In-memory byte streams:

Data Structures
struct	vlc_memstream
	In-memory stream object. More...

Functions
int	vlc_memstream_open (struct vlc_memstream *ms)
	Initializes a byte stream object.
int	vlc_memstream_flush (struct vlc_memstream *ms)
	Flushes a byte stream object.
int	vlc_memstream_close (struct vlc_memstream *ms)
	Closes a byte stream object.
size_t	vlc_memstream_write (struct vlc_memstream *ms, const void *ptr, size_t len)
	Appends a binary blob to a byte stream.
int	vlc_memstream_putc (struct vlc_memstream *ms, int c)
	Appends a single byte to a byte stream.
int	vlc_memstream_puts (struct vlc_memstream *ms, const char *str)
	Appends a nul-terminated string to a byte stream.
int	vlc_memstream_vprintf (struct vlc_memstream *ms, const char *fmt, va_list args)
	Appends a formatted string to a byte stream.
int	vlc_memstream_printf (struct vlc_memstream *s, const char *fmt,...)
	Appends a formatted string to a byte stream.

Detailed Description

In-memory byte stream are a portable wrapper for in-memory formatted output byte streams.

Compare with POSIX open_memstream().

Function Documentation

vlc_memstream_close()

int vlc_memstream_close

(

struct vlc_memstream *

ms

)

Closes a byte stream object.

This function flushes the stream object, releases any underlying resource, except for the heap-allocated formatted buffer ms->ptr, and deinitializes the object.

On success, the caller is responsible for freeing the buffer with free().

Compare with fclose().

Return values

0	success
EOF	failure (ms->ptr and ms->length are unspecified)

References vlc_memstream::error, and vlc_memstream::ptr.

Referenced by EsOutCreateStrId(), mrl_AppendAnchorFragment(), mrl_EscapeFragmentIdentifier(), RunDownloader(), sout_AnnounceRegisterSDP(), StreamExtractorCreateMRL(), vlc_chroma_conv_result_ToString(), vlc_CPU_dump(), vlc_http_msg_format(), vlc_player_input_GetSelectedTrackStringIds(), vlc_player_osd_Tracks(), vlc_spawn_inner(), vlc_strfplayer(), vlc_uri_compose(), vlc_uri_fixup(), vlc_uri_fixup_inner(), and vlc_xml_encode().

vlc_memstream_flush()

int vlc_memstream_flush

(

struct vlc_memstream *

ms

)

Flushes a byte stream object.

This function ensures that any previous write to the byte stream is flushed and the in-memory buffer is synchronized. It can be used observe the content of the buffer before the final vlc_memstream_close().

Compare with fflush().

Note

vlc_memstream_close() implicitly flushes the object. Calling vlc_memstream_flush() before closing is thus superfluous.

Warning

ms->ptr must not be freed. It can only be freed after a successful call to vlc_memstream_close().

Return values

0	success, i.e., ms->ptr and ms->length are valid
EOF	failure (ms->ptr and ms->length are unspecified)

References vlc_memstream::error.

vlc_memstream_open()

int vlc_memstream_open

(

struct vlc_memstream *

ms

)

Initializes a byte stream object.

Note

Even when this function fails, the stream object is initialized and can be used safely. It is sufficient to check for errors from vlc_memstream_flush() and vlc_memstream_close().

Compare with POSIX open_memstream().

Parameters

ms	byte stream object

Return values

0	on success
EOF	on error

References vlc_memstream::error, vlc_memstream::length, vlc_memstream::ptr, and unlikely.

Referenced by EsOutCreateStrId(), mrl_AppendAnchorFragment(), mrl_EscapeFragmentIdentifier(), RunDownloader(), sout_AnnounceRegisterSDP(), StreamExtractorCreateMRL(), vlc_chroma_conv_result_ToString(), vlc_CPU_dump(), vlc_http_msg_format(), vlc_player_input_GetSelectedTrackStringIds(), vlc_player_osd_Tracks(), vlc_spawn_inner(), vlc_strfplayer(), vlc_uri_compose(), vlc_uri_fixup(), vlc_uri_fixup_inner(), and vlc_xml_encode().

vlc_memstream_printf()

int vlc_memstream_printf	(	struct vlc_memstream *	s,
		const char *	fmt,
			...
	)

Appends a formatted string to a byte stream.

Compare with fprintf().

References vlc_memstream_vprintf().

Referenced by EsOutCreateStrId(), mrl_EscapeFragmentIdentifier(), vlc_chroma_conv_result_ToString(), vlc_http_msg_format(), vlc_spawn_inner(), vlc_strfplayer(), vlc_uri_compose(), vlc_uri_fixup_inner(), vlc_uri_putc(), vlc_xml_encode(), and write_duration().

vlc_memstream_putc()

int vlc_memstream_putc	(	struct vlc_memstream *	ms,
		int	c
	)

Appends a single byte to a byte stream.

Compare with putc() or fputc().

Parameters

ms	the VLC memstream to write to
c	Unsigned byte value converted to int.

References vlc_memstream_write().

Referenced by EsOutCreateStrId(), mrl_AppendAnchorFragment(), sout_AnnounceRegisterSDP(), StreamExtractorCreateMRL(), vlc_player_input_GetSelectedTrackStringIds(), vlc_strfplayer(), vlc_uri_compose(), vlc_uri_fixup(), vlc_uri_fixup_inner(), and vlc_uri_putc().

vlc_memstream_puts()

int vlc_memstream_puts	(	struct vlc_memstream *	ms,
		const char *	str
	)

Appends a nul-terminated string to a byte stream.

Compare with fputs().

References vlc_memstream_write().

Referenced by EsOutCreateStrId(), mrl_AppendAnchorFragment(), sout_AnnounceRegisterSDP(), StreamExtractorCreateMRL(), vlc_chroma_conv_result_ToString(), vlc_CPU_dump(), vlc_http_msg_format(), vlc_player_input_GetSelectedTrackStringIds(), vlc_player_osd_Tracks(), vlc_strfplayer(), vlc_uri_compose(), vlc_xml_encode(), and write_meta().

vlc_memstream_vprintf()

int vlc_memstream_vprintf	(	struct vlc_memstream *	ms,
		const char *	fmt,
		va_list	args
	)

Appends a formatted string to a byte stream.

Compare with vfprintf().

References vlc_memstream::error, vlc_memstream::length, vlc_memstream::ptr, and unlikely.

Referenced by vlc_memstream_printf().

vlc_memstream_write()

size_t vlc_memstream_write	(	struct vlc_memstream *	ms,
		const void *	ptr,
		size_t	len
	)

Appends a binary blob to a byte stream.

Compare with fwrite().

Parameters

ms	the VLC memstream to write to
ptr	start address of the blob
len	byte length of the blob

References vlc_memstream::error, vlc_memstream::length, vlc_memstream::ptr, and unlikely.

Referenced by RunDownloader(), sout_AnnounceRegisterSDP(), vlc_memstream_putc(), vlc_memstream_puts(), vlc_uri_compose(), vlc_uri_fixup(), and vlc_xml_encode().