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1			/*
2			* This file is part of FFmpeg.
3			*
4			* FFmpeg is free software; you can redistribute it and/or
5			* modify it under the terms of the GNU Lesser General Public
6			* License as published by the Free Software Foundation; either
7			* version 2.1 of the License, or (at your option) any later version.
8			*
9			* FFmpeg is distributed in the hope that it will be useful,
10			* but WITHOUT ANY WARRANTY; without even the implied warranty of
11			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12			* Lesser General Public License for more details.
13			*
14			* You should have received a copy of the GNU Lesser General Public
15			* License along with FFmpeg; if not, write to the Free Software
16			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17			*/
18
19			#ifndef AVFORMAT_AVIO_INTERNAL_H
20			#define AVFORMAT_AVIO_INTERNAL_H
21
22			#include "avio.h"
23
24			#include "libavutil/log.h"
25
26			extern const AVClass ff_avio_class;
27
28			typedef struct FFIOContext {
29			AVIOContext pub;
30			/**
31			* A callback that is used instead of short_seek_threshold.
32			*/
33			int (*short_seek_get)(void *opaque);
34
35			/**
36			* Threshold to favor readahead over seek.
37			*/
38			int short_seek_threshold;
39
40			enum AVIODataMarkerType current_type;
41			int64_t last_time;
42
43			/**
44			* max filesize, used to limit allocations
45			*/
46			int64_t maxsize;
47
48			/**
49			* Bytes read statistic
50			*/
51			int64_t bytes_read;
52
53			/**
54			* Bytes written statistic
55			*/
56			int64_t bytes_written;
57
58			/**
59			* seek statistic
60			*/
61			int seek_count;
62
63			/**
64			* writeout statistic
65			*/
66			int writeout_count;
67
68			/**
69			* Original buffer size
70			* used after probing to ensure seekback and to reset the buffer size
71			*/
72			int orig_buffer_size;
73
74			/**
75			* Written output size
76			* is updated each time a successful writeout ends up further position-wise
77			*/
78			int64_t written_output_size;
79			} FFIOContext;
80
81		6036527	static av_always_inline FFIOContext *ffiocontext(AVIOContext *ctx)
82			{
83		6036527	return (FFIOContext*)ctx;
84			}
85
86			void ffio_init_context(FFIOContext *s,
87			unsigned char *buffer,
88			int buffer_size,
89			int write_flag,
90			void *opaque,
91			int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
92			int (*write_packet)(void *opaque, const uint8_t *buf, int buf_size),
93			int64_t (*seek)(void *opaque, int64_t offset, int whence));
94
95			/**
96			* Wrap a buffer in an AVIOContext for reading.
97			*/
98			void ffio_init_read_context(FFIOContext *s, const uint8_t *buffer, int buffer_size);
99
100			/**
101			* Wrap a buffer in an AVIOContext for writing.
102			*/
103			void ffio_init_write_context(FFIOContext *s, uint8_t *buffer, int buffer_size);
104
105			/**
106			* Read size bytes from AVIOContext, returning a pointer.
107			* Note that the data pointed at by the returned pointer is only
108			* valid until the next call that references the same IO context.
109			* @param s IO context
110			* @param buf pointer to buffer into which to assemble the requested
111			* data if it is not available in contiguous addresses in the
112			* underlying buffer
113			* @param size number of bytes requested
114			* @param data address at which to store pointer: this will be a
115			* a direct pointer into the underlying buffer if the requested
116			* number of bytes are available at contiguous addresses, otherwise
117			* will be a copy of buf
118			* @return number of bytes read or AVERROR
119			*/
120			int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data);
121
122			void ffio_fill(AVIOContext *s, int b, int64_t count);
123
124		36571	static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
125			{
126		36571	avio_wl32(pb, MKTAG(s[0], s[1], s[2], s[3]));
127		36571	}
128
129			/**
130			* Rewind the AVIOContext using the specified buffer containing the first buf_size bytes of the file.
131			* Used after probing to avoid seeking.
132			* Joins buf and s->buffer, taking any overlap into consideration.
133			* @note s->buffer must overlap with buf or they can't be joined and the function fails
134			*
135			* @param s The read-only AVIOContext to rewind
136			* @param buf The probe buffer containing the first buf_size bytes of the file
137			* @param buf_size The size of buf
138			* @return >= 0 in case of success, a negative value corresponding to an
139			* AVERROR code in case of failure
140			*/
141			int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **buf, int buf_size);
142
143			uint64_t ffio_read_varlen(AVIOContext *bc);
144
145			/**
146			* Read a unsigned integer coded as a variable number of up to eight
147			* little-endian bytes, where the MSB in a byte signals another byte
148			* must be read.
149			* All coded bytes are read, but values > UINT_MAX are truncated.
150			*/
151			unsigned int ffio_read_leb(AVIOContext *s);
152
153			void ffio_write_leb(AVIOContext *s, unsigned val);
154
155			/**
156			* Write a sequence of text lines, converting line endings.
157			* All input line endings (LF, CRLF, CR) are converted to the configured line ending.
158			* @param s The AVIOContext to write to
159			* @param buf The buffer to write
160			* @param size The size of the buffer, or <0 to use the full length of a null-terminated string
161			* @param ending The line ending sequence to convert to, or NULL for \n
162			*/
163			void ffio_write_lines(AVIOContext *s, const unsigned char *buf, int size,
164			const unsigned char *ending);
165
166			/**
167			* Read size bytes from AVIOContext into buf.
168			* Check that exactly size bytes have been read.
169			* @return number of bytes read or AVERROR
170			*/
171			int ffio_read_size(AVIOContext *s, unsigned char *buf, int size);
172
173			/**
174			* Reallocate a given buffer for AVIOContext.
175			*
176			* @param s the AVIOContext to realloc.
177			* @param buf_size required new buffer size.
178			* @return 0 on success, a negative AVERROR on failure.
179			*/
180			int ffio_realloc_buf(AVIOContext *s, int buf_size);
181
182			/**
183			* Ensures that the requested seekback buffer size will be available
184			*
185			* Will ensure that when reading sequentially up to buf_size, seeking
186			* within the current pos and pos+buf_size is possible.
187			* Once the stream position moves outside this window or another
188			* ffio_ensure_seekback call requests a buffer outside this window this
189			* guarantee is lost.
190			*/
191			int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size);
192
193			int ffio_limit(AVIOContext *s, int size);
194
195			void ffio_init_checksum(AVIOContext *s,
196			unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
197			unsigned long checksum);
198			unsigned long ffio_get_checksum(AVIOContext *s);
199			unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
200			unsigned int len);
201			unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
202			unsigned int len);
203			unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
204			unsigned int len);
205
206			/**
207			* Open a write only packetized memory stream with a maximum packet
208			* size of 'max_packet_size'. The stream is stored in a memory buffer
209			* with a big-endian 4 byte header giving the packet size in bytes.
210			*
211			* @param s new IO context
212			* @param max_packet_size maximum packet size (must be > 0)
213			* @return zero if no error.
214			*/
215			int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
216
217			/**
218			* Return the URLContext associated with the AVIOContext
219			*
220			* @param s IO context
221			* @return pointer to URLContext or NULL.
222			*/
223			struct URLContext *ffio_geturlcontext(AVIOContext *s);
224
225			/**
226			* Create and initialize a AVIOContext for accessing the
227			* resource referenced by the URLContext h.
228			* @note When the URLContext h has been opened in read+write mode, the
229			* AVIOContext can be used only for writing.
230			*
231			* @param s Used to return the pointer to the created AVIOContext.
232			* In case of failure the pointed to value is set to NULL.
233			* @return >= 0 in case of success, a negative value corresponding to an
234			* AVERROR code in case of failure
235			*/
236			int ffio_fdopen(AVIOContext **s, struct URLContext *h);
237
238
239			/**
240			* Read url related dictionary options from the AVIOContext and write to the given dictionary
241			*/
242			int ffio_copy_url_options(AVIOContext* pb, AVDictionary** avio_opts);
243
244			/**
245			* Open a write-only fake memory stream. The written data is not stored
246			* anywhere - this is only used for measuring the amount of data
247			* written.
248			*
249			* @param s new IO context
250			* @return zero if no error.
251			*/
252			int ffio_open_null_buf(AVIOContext **s);
253
254			int ffio_open_whitelist(AVIOContext **s, const char *url, int flags,
255			const AVIOInterruptCB *int_cb, AVDictionary **options,
256			const char *whitelist, const char *blacklist);
257
258			/**
259			* Close a null buffer.
260			*
261			* @param s an IO context opened by ffio_open_null_buf
262			* @return the number of bytes written to the null buffer
263			*/
264			int ffio_close_null_buf(AVIOContext *s);
265
266			/**
267			* Reset a dynamic buffer.
268			*
269			* Resets everything, but keeps the allocated buffer for later use.
270			*/
271			void ffio_reset_dyn_buf(AVIOContext *s);
272
273			/**
274			* Free a dynamic buffer.
275			*
276			* @param s a pointer to an IO context opened by avio_open_dyn_buf()
277			*/
278			void ffio_free_dyn_buf(AVIOContext **s);
279
280			struct AVBPrint;
281			/**
282			* Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
283			* its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
284			* EOF. The line ending characters are NOT included in the buffer, but they
285			* are skipped on the input.
286			*
287			* @param s the read-only AVIOContext
288			* @param bp the AVBPrint buffer
289			* @return the length of the read line not including the line endings,
290			* negative on error, or if the buffer becomes truncated.
291			*/
292			int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, struct AVBPrint *bp);
293
294			/**
295			* Read a whole null-terminated string of text from AVIOContext to an AVBPrint
296			* buffer overwriting its contents. Stop reading after reaching the maximum
297			* length, a \\0 or EOF.
298			*
299			* @param s the read-only AVIOContext
300			* @param bp the AVBPrint buffer
301			* @param max_len the maximum length to be read from the AVIOContext.
302			* Negative (< 0) values signal that there is no known maximum
303			* length applicable. A maximum length of zero means that the
304			* AVIOContext is not touched, and the function returns
305			* with a read length of zero. In all cases the AVBprint
306			* is cleared.
307			* @return the length of the read string not including the terminating null,
308			* negative on error, or if the buffer becomes truncated.
309			*/
310			int64_t ff_read_string_to_bprint_overwrite(AVIOContext *s, struct AVBPrint *bp,
311			int64_t max_len);
312
313			#endif /* AVFORMAT_AVIO_INTERNAL_H */
314