intl/uconv/ucvcn/nsGBKConvUtil.cpp@fc2d59ddac77 (annotated)
intl/uconv/ucvcn/nsGBKConvUtil.cpp
Wed, 31 Dec 2014 07:22:50 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 07:22:50 +0100
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
- permissions
- -rw-r--r--
Correct previous dual key logic pending first delivery installment.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; 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 "nsGBKConvUtil.h" |
| michael@0 | 7 | #include "gbku.h" |
| michael@0 | 8 | #include "nsDebug.h" |
| michael@0 | 9 | #define MAX_GBK_LENGTH 24066 /* (0xfe-0x80)*(0xfe-0x3f) */ |
| michael@0 | 10 | //-------------------------------------------------------------------- |
| michael@0 | 11 | // nsGBKConvUtil |
| michael@0 | 12 | //-------------------------------------------------------------------- |
| michael@0 | 13 | |
| michael@0 | 14 | static const char16_t gGBKToUnicodeTable[MAX_GBK_LENGTH] = { |
| michael@0 | 15 | #include "cp936map.h" |
| michael@0 | 16 | }; |
| michael@0 | 17 | static const uint16_t gUnicodeToGBKTable[0xA000-0x4e00] = { |
| michael@0 | 18 | #include "cp936invmap.h" |
| michael@0 | 19 | }; |
| michael@0 | 20 | |
| michael@0 | 21 | bool nsGBKConvUtil::UnicodeToGBKChar( |
| michael@0 | 22 | char16_t aChar, bool aToGL, char* |
| michael@0 | 23 | aOutByte1, char* aOutByte2) |
| michael@0 | 24 | { |
| michael@0 | 25 | bool found=false; |
| michael@0 | 26 | *aOutByte1 = *aOutByte2 = 0; |
| michael@0 | 27 | if(UNICHAR_IN_RANGE(0xd800, aChar, 0xdfff)) |
| michael@0 | 28 | { |
| michael@0 | 29 | // surrogate is not in here |
| michael@0 | 30 | return false; |
| michael@0 | 31 | } |
| michael@0 | 32 | if(UNICHAR_IN_RANGE(0x4e00, aChar, 0x9FFF)) |
| michael@0 | 33 | { |
| michael@0 | 34 | uint16_t item = gUnicodeToGBKTable[aChar - 0x4e00]; |
| michael@0 | 35 | if(item != 0) |
| michael@0 | 36 | { |
| michael@0 | 37 | *aOutByte1 = item >> 8; |
| michael@0 | 38 | *aOutByte2 = item & 0x00FF; |
| michael@0 | 39 | found = true; |
| michael@0 | 40 | } else { |
| michael@0 | 41 | return false; |
| michael@0 | 42 | } |
| michael@0 | 43 | } else { |
| michael@0 | 44 | // ugly linear search |
| michael@0 | 45 | for( int32_t i = 0; i < MAX_GBK_LENGTH; i++ ) |
| michael@0 | 46 | { |
| michael@0 | 47 | if( aChar == gGBKToUnicodeTable[i]) |
| michael@0 | 48 | { |
| michael@0 | 49 | *aOutByte1 = (i / 0x00BF + 0x0081) ; |
| michael@0 | 50 | *aOutByte2 = (i % 0x00BF + 0x0040) ; |
| michael@0 | 51 | found = true; |
| michael@0 | 52 | break; |
| michael@0 | 53 | } |
| michael@0 | 54 | } |
| michael@0 | 55 | } |
| michael@0 | 56 | if(! found) |
| michael@0 | 57 | return false; |
| michael@0 | 58 | |
| michael@0 | 59 | if(aToGL) { |
| michael@0 | 60 | // to GL, we only return if it is in the range |
| michael@0 | 61 | if(UINT8_IN_RANGE(0xA1, *aOutByte1, 0xFE) && |
| michael@0 | 62 | UINT8_IN_RANGE(0xA1, *aOutByte2, 0xFE)) |
| michael@0 | 63 | { |
| michael@0 | 64 | // mask them to GL |
| michael@0 | 65 | *aOutByte1 &= 0x7F; |
| michael@0 | 66 | *aOutByte2 &= 0x7F; |
| michael@0 | 67 | } else { |
| michael@0 | 68 | // if it does not fit into 0xa1-0xfe 0xa1-0xfe range that mean |
| michael@0 | 69 | // it is not a GB2312 character, we cannot map to GL |
| michael@0 | 70 | *aOutByte1 = 0x00; |
| michael@0 | 71 | *aOutByte2 = 0x00; |
| michael@0 | 72 | return false; |
| michael@0 | 73 | } |
| michael@0 | 74 | } |
| michael@0 | 75 | return true; |
| michael@0 | 76 | } |
| michael@0 | 77 | char16_t nsGBKConvUtil::GBKCharToUnicode(char aByte1, char aByte2) |
| michael@0 | 78 | { |
| michael@0 | 79 | NS_ASSERTION(UINT8_IN_RANGE(0x81,aByte1, 0xFE), "first byte out of range"); |
| michael@0 | 80 | NS_ASSERTION(UINT8_IN_RANGE(0x40,aByte2, 0xFE), "second byte out of range"); |
| michael@0 | 81 | |
| michael@0 | 82 | uint8_t i1 = (uint8_t)aByte1; |
| michael@0 | 83 | uint8_t i2 = (uint8_t)aByte2; |
| michael@0 | 84 | uint16_t idx = (i1 - 0x0081) * 0x00bf + i2 - 0x0040 ; |
| michael@0 | 85 | |
| michael@0 | 86 | NS_ASSERTION(idx < MAX_GBK_LENGTH, "ARB"); |
| michael@0 | 87 | // play it safe- add if statement here ot protect ARB |
| michael@0 | 88 | // probably not necessary |
| michael@0 | 89 | if(idx < MAX_GBK_LENGTH) |
| michael@0 | 90 | return gGBKToUnicodeTable[ idx ]; |
| michael@0 | 91 | else |
| michael@0 | 92 | return UCS2_NO_MAPPING; |
| michael@0 | 93 | } |
