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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
*/
/** @file dk4bom.c The dk4bom module.
*/
#line 164 "dk4bom.ctr"
#include "dk4conf.h"
#include "dk4types.h"
#include "dk4enc.h"
#include "dk4bom.h"
#if DK4_HAVE_ASSERT_H
#ifndef ASSERT_H_INCLUDED
#include <assert.h>
#define ASSERT_H_INCLUDED 1
#endif
#endif
#line 181 "dk4bom.ctr"
void
dk4bom_detect_init(dk4_bom_detector_t *ptr, int defenc)
{
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
if (NULL != ptr) {
ptr->defenc = defenc;
ptr->found = defenc;
ptr->state = 0;
ptr->rjb = 0;
ptr->c1 = 0x00;
ptr->c2 = 0x00;
ptr->c3 = 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
dk4bom_detect_add(dk4_bom_detector_t *ptr, unsigned char byte)
{
int back = DK4_EDSTM_ERROR;
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
if (NULL != ptr) {
switch (ptr->state) {
case 0: {
ptr->c1 = byte;
ptr->rjb = 1;
switch ( (int)byte ) {
case 0x00: {
ptr->state = 4; back = DK4_EDSTM_ACCEPT;
} break;
case 0xFF: {
ptr->state = 1; back = DK4_EDSTM_ACCEPT;
} break;
case 0xFE: {
ptr->state = 7; back = DK4_EDSTM_ACCEPT;
} break;
case 0xEF: {
ptr->state = 8; back = DK4_EDSTM_ACCEPT;
} break;
default: {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
} break;
}
} break;
case 1: {
ptr->c2 = byte;
ptr->rjb = 2;
if (0xFE == byte) {
ptr->state = 2; back = DK4_EDSTM_ACCEPT;
ptr->found = DK4_FILE_ENCODING_UTF16_LE;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
}
} break;
case 2: {
ptr->c1 = byte;
ptr->rjb = 1;
if (0x00 == byte) {
ptr->state = 3; back = DK4_EDSTM_ACCEPT;
} else {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
ptr->found = DK4_FILE_ENCODING_UTF16_LE;
}
} break;
case 3: {
ptr->c2 = byte;
ptr->rjb = 2;
if (0x00 == byte) {
ptr->state = -1; back = DK4_EDSTM_FINISHED;
ptr->found = DK4_FILE_ENCODING_32_LE;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
ptr->found = DK4_FILE_ENCODING_UTF16_LE;
}
} break;
case 4: {
ptr->c2 = byte;
ptr->rjb = 2;
if (0x00 == byte) {
ptr->state = 5; back = DK4_EDSTM_ACCEPT;
} else {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
}
} break;
case 5: {
ptr->c3 = byte;
ptr->rjb = 3;
if (0xFE == byte) {
ptr->state = 6; back = DK4_EDSTM_ACCEPT;
} else {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
}
} break;
case 6: {
ptr->c4 = byte;
ptr->rjb = 4;
if (0xFF == byte) {
ptr->state = -1; back = DK4_EDSTM_FINISHED;
ptr->found = DK4_FILE_ENCODING_32_BE;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
}
} break;
case 7: {
ptr->c2 = byte;
ptr->rjb = 2;
if (0xFF == byte) {
ptr->state = -1; back = DK4_EDSTM_FINISHED;
ptr->found = DK4_FILE_ENCODING_UTF16_BE;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
}
} break;
case 8: {
ptr->c2 = byte;
ptr->rjb = 2;
if (0xBB == byte) {
ptr->state = 9; back = DK4_EDSTM_ACCEPT;
} else {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
}
} break;
case 9: {
ptr->c3 = byte;
ptr->rjb = 3;
if (0xBF == byte) {
ptr->state = -1; back = DK4_EDSTM_FINISHED;
ptr->found = DK4_FILE_ENCODING_UTF8;
ptr->rjb = 0;
} else {
ptr->state = -1; back = DK4_EDSTM_FINISHED_WITH_UNUSED;
}
} break;
}
}
return back;
}
int
dk4bom_detect_get_encoding(dk4_bom_detector_t const *ptr)
{
int back = DK4_ENCODING_PLAIN;
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
#if DK4_ON_WINDOWS
back = DK4_ENCODING_WIN1252;
#endif
if (NULL != ptr) {
back = ptr->found;
}
return back;
}
size_t
dk4bom_detect_num_unused_bytes(dk4_bom_detector_t const *ptr)
{
size_t back = 0;
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
if (NULL != ptr) {
back = ptr->rjb;
}
return back;
}
unsigned char
dk4bom_detect_unused_byte(dk4_bom_detector_t const *ptr, size_t num)
{
unsigned char back = 0x00;
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
if (NULL != ptr) {
if (0 == num) {
back = ptr->c1;
} else {
if (1 == num) {
back = ptr->c2;
} else {
if (2 == num) {
back = ptr->c3;
} else {
if (3 == num) {
back = ptr->c4;
}
}
}
}
}
return back;
}
int
dk4bom_detect_in_detection(dk4_bom_detector_t const *ptr)
{
int back = 0;
#if DK4_USE_ASSERT
assert(NULL != ptr);
#endif
if (NULL != ptr) {
if (-1 != ptr->state) {
back = 1;
}
}
return back;
}
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