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/*
WARNING: This file was generated by dkct.
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
*/
/*
Copyright (C) 2015-2017, Dirk Krause
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above opyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the author nor the names of contributors may be used
to endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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
#include "dk4conf.h"
#endif
#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif
#ifndef DK4EDSTM_H_INCLUDED
#include "dk4edstm.h"
#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 {
int defenc; /**< Default encoding, used if no BOM detected. */
int found; /**< Encoding from the BOM found. */
int state; /**< Current state of BOM detection. */
size_t rjb; /**< Number of unused bytes. */
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_ASCII,
DK4_FILE_ENCODING_ANSI, 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 *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 *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 *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 *ptr);
#ifdef __cplusplus
}
#endif
#endif
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