KCodecs

nsEscCharsetProber.cpp
1/* -*- C++ -*-
2 SPDX-FileCopyrightText: 1998 Netscape Communications Corporation <developer@mozilla.org>
3
4 SPDX-License-Identifier: MIT
5*/
6
7#include "nsEscCharsetProber.h"
8
9namespace kencodingprober
10{
11nsEscCharSetProber::nsEscCharSetProber(void)
12{
13 mCodingSM[0] = new nsCodingStateMachine(&HZSMModel);
14 mCodingSM[1] = new nsCodingStateMachine(&ISO2022CNSMModel);
15 mCodingSM[2] = new nsCodingStateMachine(&ISO2022JPSMModel);
16 mCodingSM[3] = new nsCodingStateMachine(&ISO2022KRSMModel);
17 mActiveSM = NUM_OF_ESC_CHARSETS;
18 mState = eDetecting;
19 mDetectedCharset = nullptr;
20}
21
22nsEscCharSetProber::~nsEscCharSetProber(void)
23{
24 for (unsigned int i = 0; i < NUM_OF_ESC_CHARSETS; i++) {
25 delete mCodingSM[i];
26 }
27}
28
29void nsEscCharSetProber::Reset(void)
30{
31 mState = eDetecting;
32 for (unsigned int i = 0; i < NUM_OF_ESC_CHARSETS; i++) {
33 mCodingSM[i]->Reset();
34 }
35 mActiveSM = NUM_OF_ESC_CHARSETS;
36 mDetectedCharset = nullptr;
37}
38
39nsProbingState nsEscCharSetProber::HandleData(const char *aBuf, unsigned int aLen)
40{
41 nsSMState codingState;
42 int j;
43 unsigned int i;
44
45 for (i = 0; i < aLen && mState == eDetecting; i++) {
46 for (j = mActiveSM - 1; j >= 0; j--) {
47 // byte is feed to all active state machine
48 codingState = mCodingSM[j]->NextState(aBuf[i]);
49 if (codingState == eError) {
50 // got negative answer for this state machine, make it inactive
51 mActiveSM--;
52 if (mActiveSM == 0) {
53 mState = eNotMe;
54 return mState;
55 } else if (j != (int)mActiveSM) {
56 nsCodingStateMachine *t;
57 t = mCodingSM[mActiveSM];
58 mCodingSM[mActiveSM] = mCodingSM[j];
59 mCodingSM[j] = t;
60 }
61 } else if (codingState == eItsMe) {
62 mState = eFoundIt;
63 mDetectedCharset = mCodingSM[j]->GetCodingStateMachine();
64 return mState;
65 }
66 }
67 }
68
69 return mState;
70}
71}
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