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/*
Copyright (C) 2015-2020, Dirk Krause
SPDX-License-Identifier: BSD-3-Clause
*/
/*
WARNING: This file was generated by the dkct program (see
http://dktools.sourceforge.net/ for details).
Changes you make here will be lost if dkct is run again!
You should modify the original source and run dkct on it.
Original source: dk4bom.ctr
*/
#ifndef DK4BOM_H_INCLUDED
/** Avoid multiple inclusions. */
#define DK4BOM_H_INCLUDED 1
#line 10 "dk4bom.ctr"
/** @file
Detect BOM (byte order marker) at start
of data stream, keep track of unprocessed characters.
First, use dk4bom_detect_init() to initialize the state machine.
Now use dk4bom_detect_add() to add the data streams contents
byte by byte to the state machine as long as the dk4bom_detect_add()
function returns DK4_EDSTM_ACCEPT.
If the function returns DK4_EDSTM_ERROR, an error occured, you
should stop processing.
If the function returns DK4_EDSTM_FINISHED or
DK4_EDSTM_FINISHED_WITH_UNUSED a BOM was found or definitely not
found. Use dk4bom_detect_get_encoding() to obtain the decoding
found and process the remaining data stream in that encoding.
If the function returned DK4_EDSTM_FINISHED_WITH_UNUSED, use
dk4bom_detect_num_unused_bytes() to find the number of unused
bytes saved in the detector and dk4bom_detect_unused_byte()
to retrieve and process the unused bytes before processing the
remaining bytes from the data stream.
For a very short data stream, the detection may not be finished
at the end of the stream. Use dk4bom_detect_in_detection() to
find out whether the detection was not yet finished.
If the function returns 1, the detection is not finished and unused
bytes are stored in the detector. Use dk4bom_detect_num_unused_bytes()
and dk4bom_detect_unused_byte() to obtain the unused bytes.
CRT on Windows: Not used.
*/
#ifndef DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif
#ifndef DK4TYPES_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4types.h"
#else
#include <dktools-4/dk4types.h>
#endif
#endif
#ifndef DK4EDSTM_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4edstm.h"
#else
#include <dktools-4/dk4edstm.h>
#endif
#endif
#if DK4_HAVE_SYS_TYPES_H
#ifndef SYS_TYPES_H_INCLUDED
#include <sys/types.h>
#define SYS_TYPES_H_INCLUDED 1
#endif
#endif
/** State machine to detect a BOM (byte order marker)
at the beginning of a data stream.
*/
typedef struct {
size_t rjb; /**< Number of unused bytes. */
int defenc; /**< Default encoding, used if no BOM detected. */
int found; /**< Encoding from the BOM found. */
int state; /**< Current state of BOM detection. */
unsigned char c1; /**< Rejected byte 1. */
unsigned char c2; /**< Rejected byte 2. */
unsigned char c3; /**< Rejected byte 3. */
unsigned char c4; /**< Rejected byte 4. */
} dk4_bom_detector_t;
#ifdef __cplusplus
extern "C" {
#endif
/** Initialize the BOM detector.
@param ptr BOM detector to initialize.
@param defenc Encoding to use if not BOM at beginning of data.
*/
void
dk4bom_detect_init(dk4_bom_detector_t *ptr, int defenc);
/** Add one byte to the BOM detector.
@param ptr Detector to use.
@param byte The data byte to add.
@return Operation result, one from:
DK4_EDSTM_ACCEPT if you can continue feeding bytes into the
detector,
DK4_EDSTM_FINISHED if a BOM was detected (do not feed further
bytes),
DK4_EDSTM_FINISHED_WITH_UNUSED if BOM detection was finished and there
are unused bytes stored in the detector), or
DK4_EDSTM_ERROR if you attempt to add further bytes after the
detection was finished.
On DK4_EDSTM_FINISHED and DK4_EDSTM_FINISHED_WITH_UNUSED you can use
dk4bom_detect_get_encoding() to retrieve the encoding.
On DK4_EDSTM_FINISHED_WITH_UNUSED use dk4bom_detect_num_unused_bytes()
and dk4bom_detect_unused_byte() to retrieve the unused
bytes from the detector and process them before processing
further data from the data stream.
*/
int
dk4bom_detect_add(dk4_bom_detector_t *ptr, unsigned char byte);
/** Retrieve the encoding from the detector.
@param ptr Detector to use.
@return A file encoding, one from: DK4_FILE_ENCODING_PLAIN,
DK4_FILE_ENCODING_WIN1252, DK4_FILE_ENCODING_UTF8,
DK4_FILE_ENCODING_UTF16_LE, DK4_FILE_ENCODING_UTF16_BE,
DK4_FILE_ENCODING_32_LE, or DK4_FILE_ENCODING_32_BE.
*/
int
dk4bom_detect_get_encoding(dk4_bom_detector_t const *ptr);
/** Retrieve the number of cted bytes stored in the detector.
@param ptr Detector to use.
@return Number of unused bytes stored in the detector.
*/
size_t
dk4bom_detect_num_unused_bytes(dk4_bom_detector_t const *ptr);
/** Retrieve one unused byte stored in the detector.
@param ptr Detector to use.
@param num Byte number.
@return The byte value.
*/
unsigned char
dk4bom_detect_unused_byte(dk4_bom_detector_t const *ptr, size_t num);
/** Check if BOM detection is still in progress.
@param ptr Detector to check.
@return 1 if detection is in progress and bytes are
stored in the detector, 0 otherwise.
*/
int
dk4bom_detect_in_detection(dk4_bom_detector_t const *ptr);
#ifdef __cplusplus
}
#endif
#endif
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