extensions/universalchardet/src/base/nsUTF8Prober.cpp@b8a032363ba2 (annotated)
extensions/universalchardet/src/base/nsUTF8Prober.cpp
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include "nsUTF8Prober.h" |
| michael@0 | 7 | |
| michael@0 | 8 | void nsUTF8Prober::Reset(void) |
| michael@0 | 9 | { |
| michael@0 | 10 | mCodingSM->Reset(); |
| michael@0 | 11 | mNumOfMBChar = 0; |
| michael@0 | 12 | mState = eDetecting; |
| michael@0 | 13 | } |
| michael@0 | 14 | |
| michael@0 | 15 | nsProbingState nsUTF8Prober::HandleData(const char* aBuf, uint32_t aLen) |
| michael@0 | 16 | { |
| michael@0 | 17 | nsSMState codingState; |
| michael@0 | 18 | |
| michael@0 | 19 | for (uint32_t i = 0; i < aLen; i++) |
| michael@0 | 20 | { |
| michael@0 | 21 | codingState = mCodingSM->NextState(aBuf[i]); |
| michael@0 | 22 | if (codingState == eItsMe) |
| michael@0 | 23 | { |
| michael@0 | 24 | mState = eFoundIt; |
| michael@0 | 25 | break; |
| michael@0 | 26 | } |
| michael@0 | 27 | if (codingState == eStart) |
| michael@0 | 28 | { |
| michael@0 | 29 | if (mCodingSM->GetCurrentCharLen() >= 2) |
| michael@0 | 30 | mNumOfMBChar++; |
| michael@0 | 31 | } |
| michael@0 | 32 | } |
| michael@0 | 33 | |
| michael@0 | 34 | if (mState == eDetecting) |
| michael@0 | 35 | if (GetConfidence() > SHORTCUT_THRESHOLD) |
| michael@0 | 36 | mState = eFoundIt; |
| michael@0 | 37 | return mState; |
| michael@0 | 38 | } |
| michael@0 | 39 | |
| michael@0 | 40 | #define ONE_CHAR_PROB (float)0.50 |
| michael@0 | 41 | |
| michael@0 | 42 | float nsUTF8Prober::GetConfidence(void) |
| michael@0 | 43 | { |
| michael@0 | 44 | float unlike = (float)0.99; |
| michael@0 | 45 | |
| michael@0 | 46 | if (mNumOfMBChar < 6) |
| michael@0 | 47 | { |
| michael@0 | 48 | for (uint32_t i = 0; i < mNumOfMBChar; i++) |
| michael@0 | 49 | unlike *= ONE_CHAR_PROB; |
| michael@0 | 50 | return (float)1.0 - unlike; |
| michael@0 | 51 | } |
| michael@0 | 52 | else |
| michael@0 | 53 | return (float)0.99; |
| michael@0 | 54 | } |
| michael@0 | 55 |
