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44 @brief Implementation of a byte input-output process (CIO)
46 The functions in CIO.C have for goal to realize a byte input / output process.
49 /** @defgroup CIO CIO - byte input-output stream */
52 #include "opj_config_private.h"
54 /* ----------------------------------------------------------------------- */
56 #if defined(OPJ_BIG_ENDIAN)
57 #define opj_write_bytes opj_write_bytes_BE
58 #define opj_read_bytes opj_read_bytes_BE
59 #define opj_write_double opj_write_double_BE
60 #define opj_read_double opj_read_double_BE
61 #define opj_write_float opj_write_float_BE
62 #define opj_read_float opj_read_float_BE
64 #define opj_write_bytes opj_write_bytes_LE
65 #define opj_read_bytes opj_read_bytes_LE
66 #define opj_write_double opj_write_double_LE
67 #define opj_read_double opj_read_double_LE
68 #define opj_write_float opj_write_float_LE
69 #define opj_read_float opj_read_float_LE
73 #define OPJ_STREAM_STATUS_OUTPUT 0x1U
74 #define OPJ_STREAM_STATUS_INPUT 0x2U
75 #define OPJ_STREAM_STATUS_END 0x4U
76 #define OPJ_STREAM_STATUS_ERROR 0x8U
79 Byte input-output stream.
81 typedef struct opj_stream_private {
83 * User data, be it files, ... The actual data depends on the type of the stream.
88 * Pointer to function to free m_user_data (NULL at initialization)
89 * when destroying the stream. If pointer is NULL the function is not
90 * called and the m_user_data is not freed (even if non-NULL).
92 opj_stream_free_user_data_fn m_free_user_data_fn;
97 OPJ_UINT64 m_user_data_length;
100 * Pointer to actual read function (NULL at the initialization of the cio.
102 opj_stream_read_fn m_read_fn;
105 * Pointer to actual write function (NULL at the initialization of the cio.
107 opj_stream_write_fn m_write_fn;
110 * Pointer to actual skip function (NULL at the initialization of the cio.
111 * There is no seek function to prevent from back and forth slow procedures.
113 opj_stream_skip_fn m_skip_fn;
116 * Pointer to actual seek function (if available).
118 opj_stream_seek_fn m_seek_fn;
121 * Actual data stored into the stream if read from. Data is read by chunk of fixed size.
122 * you should never access this data directly.
124 OPJ_BYTE * m_stored_data;
127 * Pointer to the current read data.
129 OPJ_BYTE * m_current_data;
134 OPJ_OFF_T(* m_opj_skip)(struct opj_stream_private *, OPJ_OFF_T,
135 struct opj_event_mgr *);
140 OPJ_BOOL(* m_opj_seek)(struct opj_stream_private *, OPJ_OFF_T,
141 struct opj_event_mgr *);
144 * number of bytes containing in the buffer.
146 OPJ_SIZE_T m_bytes_in_buffer;
149 * The number of bytes read/written from the beginning of the stream
151 OPJ_OFF_T m_byte_offset;
154 * The size of the buffer.
156 OPJ_SIZE_T m_buffer_size;
159 * Flags to tell the status of the stream.
160 * Used with OPJ_STREAM_STATUS_* defines.
165 opj_stream_private_t;
167 /** @name Exported functions (see also openjpeg.h) */
169 /* ----------------------------------------------------------------------- */
171 * Write some bytes to the given data buffer, this function is used in Big Endian cpus.
172 * @param p_buffer pointer the data buffer to write data to.
173 * @param p_value the value to write
174 * @param p_nb_bytes the number of bytes to write
176 void opj_write_bytes_BE(OPJ_BYTE * p_buffer, OPJ_UINT32 p_value,
177 OPJ_UINT32 p_nb_bytes);
180 * Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
181 * @param p_buffer pointer the data buffer to read data from.
182 * @param p_value pointer to the value that will store the data.
183 * @param p_nb_bytes the nb bytes to read.
184 * @return the number of bytes read or -1 if an error occurred.
186 void opj_read_bytes_BE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value,
187 OPJ_UINT32 p_nb_bytes);
190 * Write some bytes to the given data buffer, this function is used in Little Endian cpus.
191 * @param p_buffer pointer the data buffer to write data to.
192 * @param p_value the value to write
193 * @param p_nb_bytes the number of bytes to write
194 * @return the number of bytes written or -1 if an error occurred
196 void opj_write_bytes_LE(OPJ_BYTE * p_buffer, OPJ_UINT32 p_value,
197 OPJ_UINT32 p_nb_bytes);
200 * Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
201 * @param p_buffer pointer the data buffer to read data from.
202 * @param p_value pointer to the value that will store the data.
203 * @param p_nb_bytes the nb bytes to read.
204 * @return the number of bytes read or -1 if an error occurred.
206 void opj_read_bytes_LE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value,
207 OPJ_UINT32 p_nb_bytes);
211 * Write some bytes to the given data buffer, this function is used in Little Endian cpus.
212 * @param p_buffer pointer the data buffer to write data to.
213 * @param p_value the value to write
215 void opj_write_double_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value);
218 * Write some bytes to the given data buffer, this function is used in Big Endian cpus.
219 * @param p_buffer pointer the data buffer to write data to.
220 * @param p_value the value to write
222 void opj_write_double_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value);
225 * Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
226 * @param p_buffer pointer the data buffer to read data from.
227 * @param p_value pointer to the value that will store the data.
229 void opj_read_double_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value);
232 * Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
233 * @param p_buffer pointer the data buffer to read data from.
234 * @param p_value pointer to the value that will store the data.
236 void opj_read_double_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value);
239 * Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
240 * @param p_buffer pointer the data buffer to read data from.
241 * @param p_value pointer to the value that will store the data.
243 void opj_read_float_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value);
246 * Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
247 * @param p_buffer pointer the data buffer to read data from.
248 * @param p_value pointer to the value that will store the data.
250 void opj_read_float_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value);
253 * Write some bytes to the given data buffer, this function is used in Little Endian cpus.
254 * @param p_buffer pointer the data buffer to write data to.
255 * @param p_value the value to write
257 void opj_write_float_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value);
260 * Write some bytes to the given data buffer, this function is used in Big Endian cpus.
261 * @param p_buffer pointer the data buffer to write data to.
262 * @param p_value the value to write
264 void opj_write_float_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value);
267 * Reads some bytes from the stream.
268 * @param p_stream the stream to read data from.
269 * @param p_buffer pointer to the data buffer that will receive the data.
270 * @param p_size number of bytes to read.
271 * @param p_event_mgr the user event manager to be notified of special events.
272 * @return the number of bytes read, or -1 if an error occurred or if the stream is at the end.
274 OPJ_SIZE_T opj_stream_read_data(opj_stream_private_t * p_stream,
275 OPJ_BYTE * p_buffer, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);
278 * Writes some bytes to the stream.
279 * @param p_stream the stream to write data to.
280 * @param p_buffer pointer to the data buffer holds the data to be writtent.
281 * @param p_size number of bytes to write.
282 * @param p_event_mgr the user event manager to be notified of special events.
283 * @return the number of bytes writtent, or -1 if an error occurred.
285 OPJ_SIZE_T opj_stream_write_data(opj_stream_private_t * p_stream,
286 const OPJ_BYTE * p_buffer, OPJ_SIZE_T p_size,
287 struct opj_event_mgr * p_event_mgr);
290 * Writes the content of the stream buffer to the stream.
291 * @param p_stream the stream to write data to.
292 * @param p_event_mgr the user event manager to be notified of special events.
293 * @return true if the data could be flushed, false else.
295 OPJ_BOOL opj_stream_flush(opj_stream_private_t * p_stream,
296 struct opj_event_mgr * p_event_mgr);
299 * Skips a number of bytes from the stream.
300 * @param p_stream the stream to skip data from.
301 * @param p_size the number of bytes to skip.
302 * @param p_event_mgr the user event manager to be notified of special events.
303 * @return the number of bytes skipped, or -1 if an error occurred.
305 OPJ_OFF_T opj_stream_skip(opj_stream_private_t * p_stream, OPJ_OFF_T p_size,
306 struct opj_event_mgr * p_event_mgr);
309 * Tells the byte offset on the stream (similar to ftell).
311 * @param p_stream the stream to get the information from.
313 * @return the current position o fthe stream.
315 OPJ_OFF_T opj_stream_tell(const opj_stream_private_t * p_stream);
319 * Get the number of bytes left before the end of the stream (similar to cio_numbytesleft).
321 * @param p_stream the stream to get the information from.
323 * @return Number of bytes left before the end of the stream.
325 OPJ_OFF_T opj_stream_get_number_byte_left(const opj_stream_private_t *
329 * Skips a number of bytes from the stream.
330 * @param p_stream the stream to skip data from.
331 * @param p_size the number of bytes to skip.
332 * @param p_event_mgr the user event manager to be notified of special events.
333 * @return the number of bytes skipped, or -1 if an error occurred.
335 OPJ_OFF_T opj_stream_write_skip(opj_stream_private_t * p_stream,
336 OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr);
339 * Skips a number of bytes from the stream.
340 * @param p_stream the stream to skip data from.
341 * @param p_size the number of bytes to skip.
342 * @param p_event_mgr the user event manager to be notified of special events.
343 * @return the number of bytes skipped, or -1 if an error occurred.
345 OPJ_OFF_T opj_stream_read_skip(opj_stream_private_t * p_stream,
346 OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr);
349 * Skips a number of bytes from the stream.
350 * @param p_stream the stream to skip data from.
351 * @param p_size the number of bytes to skip.
352 * @param p_event_mgr the user event manager to be notified of special events.
353 * @return OPJ_TRUE if success, or OPJ_FALSE if an error occurred.
355 OPJ_BOOL opj_stream_read_seek(opj_stream_private_t * p_stream, OPJ_OFF_T p_size,
356 struct opj_event_mgr * p_event_mgr);
359 * Skips a number of bytes from the stream.
360 * @param p_stream the stream to skip data from.
361 * @param p_size the number of bytes to skip.
362 * @param p_event_mgr the user event manager to be notified of special events.
363 * @return the number of bytes skipped, or -1 if an error occurred.
365 OPJ_BOOL opj_stream_write_seek(opj_stream_private_t * p_stream,
366 OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr);
369 * Seeks a number of bytes from the stream.
370 * @param p_stream the stream to skip data from.
371 * @param p_size the number of bytes to skip.
372 * @param p_event_mgr the user event manager to be notified of special events.
373 * @return true if the stream is seekable.
375 OPJ_BOOL opj_stream_seek(opj_stream_private_t * p_stream, OPJ_OFF_T p_size,
376 struct opj_event_mgr * p_event_mgr);
379 * Tells if the given stream is seekable.
381 OPJ_BOOL opj_stream_has_seek(const opj_stream_private_t * p_stream);
386 OPJ_SIZE_T opj_stream_default_read(void * p_buffer, OPJ_SIZE_T p_nb_bytes,
392 OPJ_SIZE_T opj_stream_default_write(void * p_buffer, OPJ_SIZE_T p_nb_bytes,
398 OPJ_OFF_T opj_stream_default_skip(OPJ_OFF_T p_nb_bytes, void * p_user_data);
403 OPJ_BOOL opj_stream_default_seek(OPJ_OFF_T p_nb_bytes, void * p_user_data);
405 /* ----------------------------------------------------------------------- */
411 #endif /* OPJ_CIO_H */