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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: dk3bom.ctr
*/
/** @file dk3bom.c The dk3bom module.
*/
#line 76 "dk3bom.ctr"
#include "dk3conf.h"
#include "dk3const.h"
#include "dk3stm.h"
#include "dk3bom.h"
/** Initialize detector structure.
@param ptr Detector structure to initialize.
*/
void
dk3bom_detect_init(dk3_bom_detector_t *ptr, int de)
{
if (NULL != ptr) {
ptr->defenc = de;
ptr->found = de;
ptr->state = 0;
ptr->rjb = 0;
ptr->rj[0] = 0x00;
ptr->rj[1] = 0x00;
ptr->rj[2] = 0x00;
ptr->rj[3] = 0x00;
}
}
/*
BOMS and states
---------------
UTF-32 LSB: 0xFF (1) 0xFE (2) 0x00 (3) 0x00
UTF-32 MSB: 0x00 (4) 0x00 (5) 0xFE (6) 0xFF
UTF-16 LSB: 0xFF (1) 0xFE (2)
UTF-16 MSB: 0xFE (7) 0xFF
UTF-8: 0xEF (8) 0xBB (9) 0xBF
*/
int
dk3bom_detect_add(dk3_bom_detector_t *ptr, unsigned char b)
{
int back = DK3_STM_ERROR;
if (NULL != ptr) {
switch (ptr->state) {
case 0: {
ptr->rj[0] = b;
ptr->rjb = 1;
switch ((int)(b)) {
case 0x00: {
ptr->state = 4; back = DK3_STM_ACCEPT;
} break;
case 0xFF: {
ptr->state = 1; back = DK3_STM_ACCEPT;
} break;
case 0xFE: {
ptr->state = 7; back = DK3_STM_ACCEPT;
} break;
case 0xEF: {
ptr->state = 8; back = DK3_STM_ACCEPT;
} break;
default: {
ptr->state = -1; back = DK3_STM_FINISHED;
} break;
}
} break;
case 1: {
ptr->rj[1] = b;
ptr->rjb = 2;
if (0xFE == b) {
ptr->state = 2;
back = DK3_STM_ACCEPT;
ptr->found = DK3_FILE_ENCODING_UTF16_LSB_FIRST;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK3_STM_FINISHED;
}
} break;
case 2: {
ptr->rj[0] = b;
ptr->rjb = 1;
if (0x00 == b) {
ptr->state = 3; back = DK3_STM_ACCEPT;
} else {
ptr->state = -1; back = DK3_STM_FINISHED;
ptr->found = DK3_FILE_ENCODING_UTF16_LSB_FIRST;
}
} break;
case 3: {
ptr->rj[1] = b;
ptr->rjb = 2;
if (0x00 == b) {
ptr->state = -1; back = DK3_STM_FINISHED;
ptr->found = DK3_FILE_ENCODING_UNICODE_LSB_FIRST;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK3_STM_FINISHED;
ptr->found = DK3_FILE_ENCODING_UTF16_LSB_FIRST;
}
} break;
case 4: {
ptr->rj[1] = b;
ptr->rjb = 2;
if (0x00 == b) {
ptr->state = 5; back = DK3_STM_ACCEPT;
} else {
ptr->state = -1; back = DK3_STM_FINISHED;
}
} break;
case 5: {
ptr->rj[2] = b;
ptr->rjb = 3;
if (0xFE == b) {
ptr->state = 6; back = DK3_STM_ACCEPT;
} else {
ptr->state = -1; back = DK3_STM_FINISHED;
}
} break;
case 6: {
ptr->rj[3] = b;
ptr->rjb = 4;
if (0xFF == b) {
ptr->state = -1; back = DK3_STM_FINISHED;
ptr->found = DK3_FILE_ENCODING_UNICODE_MSB_FIRST;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK3_STM_FINISHED;
}
} break;
case 7: {
ptr->rj[1] = b;
ptr->rjb = 2;
if (0xFF == b) {
ptr->state= -1; back = DK3_STM_FINISHED;
ptr->found = DK3_FILE_ENCODING_UTF16_MSB_FIRST;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK3_STM_FINISHED;
}
} break;
case 8: {
ptr->rj[1] = b;
ptr->rjb = 2;
if (0xBB == b) {
ptr->state = 9; back = DK3_STM_ACCEPT;
} else {
ptr->state = -1; back = DK3_STM_FINISHED;
}
} break;
case 9: {
ptr->rj[2] = b;
ptr->rjb = 3;
if (0xBF == b) {
ptr->state = -1; back = DK3_STM_FINISHED;
ptr->found = DK3_FILE_ENCODING_UTF8;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK3_STM_FINISHED;
}
} break;
/*
Default not necessary due to initialization of return variable.
*/
}
}
return back;
}
void
dk3bom_detect_results(
int *enc, const unsigned char **rjptr, size_t *rjsz, dk3_bom_detector_t *ptr
)
{
if (NULL != ptr) {
if (NULL != enc) { *enc = ptr->found; }
if ((NULL != rjptr) && (NULL != rjsz)) {
*rjptr = ptr->rj;
*rjsz = ptr->rjb;
} else {
if (NULL != rjptr) { *rjptr = NULL; }
if (NULL != rjsz ) { *rjsz = 0; }
}
}
}
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