spandsp
3.0.0
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#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "spandsp/stdbool.h"
#include "spandsp/telephony.h"
#include "spandsp/alloc.h"
#include "spandsp/logging.h"
#include "spandsp/async.h"
#include "spandsp/timezone.h"
#include "spandsp/t4_rx.h"
#include "spandsp/t4_tx.h"
#include "spandsp/t81_t82_arith_coding.h"
#include "spandsp/t85.h"
#include "spandsp/private/logging.h"
#include "spandsp/private/t81_t82_arith_coding.h"
#include "spandsp/private/t85.h"
Functions | |
bool | t85_analyse_header (uint32_t *width, uint32_t *length, const uint8_t data[], size_t len) |
void | t85_decode_rx_status (t85_decode_state_t *s, int status) |
Inform the T.85 decode engine of a status change in the signal source (end of tx, rx signal change, etc.). More... | |
int | t85_decode_put (t85_decode_state_t *s, const uint8_t data[], size_t len) |
Decode a chunk of T.85 data. More... | |
int | t85_decode_set_row_write_handler (t85_decode_state_t *s, t4_row_write_handler_t handler, void *user_data) |
Set the row handler routine. More... | |
int | t85_decode_set_comment_handler (t85_decode_state_t *s, uint32_t max_comment_len, t4_row_write_handler_t handler, void *user_data) |
Set the comment handler routine. More... | |
int | t85_decode_set_image_size_constraints (t85_decode_state_t *s, uint32_t max_xd, uint32_t max_yd) |
Set constraints on the received image size. More... | |
uint32_t | t85_decode_get_image_width (t85_decode_state_t *s) |
Get the width of the image. More... | |
uint32_t | t85_decode_get_image_length (t85_decode_state_t *s) |
Get the length of the image. More... | |
int | t85_decode_get_compressed_image_size (t85_decode_state_t *s) |
Get the size of the compressed image, in bits. More... | |
int | t85_decode_new_plane (t85_decode_state_t *s) |
logging_state_t * | t85_decode_get_logging_state (t85_decode_state_t *s) |
Get the logging context associated with a T.85 decode context. More... | |
int | t85_decode_restart (t85_decode_state_t *s) |
t85_decode_state_t * | t85_decode_init (t85_decode_state_t *s, t4_row_write_handler_t handler, void *user_data) |
Prepare to decode an image in T.85 format. More... | |
int | t85_decode_release (t85_decode_state_t *s) |
Release a T.85 decode context. More... | |
int | t85_decode_free (t85_decode_state_t *s) |
Free a T.85 decode context. More... | |
int t85_decode_free | ( | t85_decode_state_t * | s | ) |
Free a T.85 decode context.
s | The T.85 decode context. |
References t85_decode_state_s::s, and t85_decode_release().
Referenced by t43_decode_free().
int t85_decode_get_compressed_image_size | ( | t85_decode_state_t * | s | ) |
Get the size of the compressed image, in bits.
s | The T.85 context. |
References t85_decode_state_s::s.
uint32_t t85_decode_get_image_length | ( | t85_decode_state_t * | s | ) |
Get the length of the image.
s | The T.85 context. |
References t85_decode_state_s::s.
Referenced by t43_decode_get_image_length().
uint32_t t85_decode_get_image_width | ( | t85_decode_state_t * | s | ) |
Get the width of the image.
s | The T.85 context. |
References t85_decode_state_s::s.
Referenced by t43_decode_get_image_width().
logging_state_t* t85_decode_get_logging_state | ( | t85_decode_state_t * | s | ) |
Get the logging context associated with a T.85 decode context.
Get the logging context associated with a T.85 decode context.
s | The T.85 decode context. |
References t85_decode_state_s::s.
t85_decode_state_t* t85_decode_init | ( | t85_decode_state_t * | s, |
t4_row_write_handler_t | handler, | ||
void * | user_data | ||
) |
Prepare to decode an image in T.85 format.
s | The T.85 context. |
handler | A callback routine to handle decoded image rows. |
user_data | An opaque pointer passed to handler. |
References t85_decode_state_s::s.
int t85_decode_put | ( | t85_decode_state_t * | s, |
const uint8_t | data[], | ||
size_t | len | ||
) |
Decode a chunk of T.85 data.
s | The T.85 context. |
data | The data to be decoded. |
len | The length of the data to be decoded. |
References t85_decode_state_s::y.
int t85_decode_release | ( | t85_decode_state_t * | s | ) |
Release a T.85 decode context.
s | The T.85 decode context. |
References t85_decode_state_s::s.
Referenced by t43_decode_release(), and t85_decode_free().
void t85_decode_rx_status | ( | t85_decode_state_t * | s, |
int | status | ||
) |
Inform the T.85 decode engine of a status change in the signal source (end of tx, rx signal change, etc.).
After the final BIE byte has been delivered to t85_decode_put_xx(), it may still return T85_MORE_DATA when the T85_VLENGTH option was used, and no NEWLEN marker section has appeared yet. This is because such a BIE is not self-terminating (i.e. there could still be a NEWLEN followed by an SDNORM or SDRST at the very end of the final stripe, which needs to be processed before the final row is output. See ITU-T Recommendation T.85, Appendix I). Therefore, after the last byte has been delivered, call this routine to signal the end of the BIE. This is necessary to allow the routine to finish processing BIEs with option T85_VLENGTH that do not actually contain any NEWLEN marker section.
s | The T.85 context. |
status | The type of status change which occured. |
References t85_decode_state_s::s, and span_log().
int t85_decode_set_comment_handler | ( | t85_decode_state_t * | s, |
uint32_t | max_comment_len, | ||
t4_row_write_handler_t | handler, | ||
void * | user_data | ||
) |
Set the comment handler routine.
s | The T.85 context. |
max_comment_len | The maximum length of comment to be passed to the handler. |
handler | A callback routine to handle decoded comment. |
user_data | An opaque pointer passed to handler. |
References t85_decode_state_s::max_comment_len, and t85_decode_state_s::s.
Referenced by t43_decode_set_comment_handler().
int t85_decode_set_image_size_constraints | ( | t85_decode_state_t * | s, |
uint32_t | max_xd, | ||
uint32_t | max_yd | ||
) |
Set constraints on the received image size.
A maliciously constructed T.85 image could consume too much memory, and constitute a denial of service attack on the system. This function allows constraints to be applied.
s | The T.85 context. |
max_xd | The maximum permitted width of the full image, in pixels |
max_yd | The maximum permitted height of the full image, in pixels |
References t85_decode_state_s::max_xd, t85_decode_state_s::max_yd, and t85_decode_state_s::s.
int t85_decode_set_row_write_handler | ( | t85_decode_state_t * | s, |
t4_row_write_handler_t | handler, | ||
void * | user_data | ||
) |
Set the row handler routine.
s | The T.85 context. |
handler | A callback routine to handle decoded image rows. |
user_data | An opaque pointer passed to handler. |
References t85_decode_state_s::s.
Referenced by t4_rx_set_row_write_handler().