The Tor Browser: intl/uconv/ucvcn/nsUnicodeToHZ.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5  /**

     6  * A character set converter from Unicode to HZ.

     7  *

     8  *

     9  * @created         08/Sept/1999

    10  * @author  Yueheng Xu, Yueheng.Xu@intel.com

    11  * Revision History

    12  * 04/Oct/1999. Yueheng Xu: Fixed line continuation problem when line

    13  *                          ended by '~';

    14  *              Used table UnicodeToGBK[] to speed up the mapping.

    15  */

    16 #include "nsUnicodeToHZ.h"

    17 #include "gbku.h"

    18 //----------------------------------------------------------------------

    19 // Class nsUnicodeToGBK [implementation]

    20 #define HZ_STATE_GB		1

    21 #define HZ_STATE_ASCII	2

    22 #define HZ_STATE_TILD	3

    23 #define HZLEAD1 '~'

    24 #define HZLEAD2 '{'

    25 #define HZLEAD3 '}'

    26 #define UNICODE_TILD	0x007E

    27 nsUnicodeToHZ::nsUnicodeToHZ() : nsEncoderSupport(6)

    28 {

    29   mHZState = HZ_STATE_ASCII;	// per HZ spec, default to HZ mode

    30 }

    31 NS_IMETHODIMP nsUnicodeToHZ::ConvertNoBuff(

    32   const char16_t * aSrc,

    33   int32_t * aSrcLength,

    34   char * aDest,

    35   int32_t * aDestLength)

    36 {

    37   int32_t i=0;

    38   int32_t iSrcLength = *aSrcLength;

    39   int32_t iDestLength = 0;

    41   for (i=0;i< iSrcLength;i++)

    42   {

    43     if(! IS_ASCII(*aSrc))

    44     {

    45       // hi byte has something, it is not ASCII, process as a GB

    46       if ( mHZState != HZ_STATE_GB )

    47       {

    48         // we are adding a '~{' ESC sequence to star a HZ string

    49         mHZState = HZ_STATE_GB;

    50         aDest[0] = '~';

    51         aDest[1] = '{';

    52         aDest += 2;	// increment 2 bytes

    53         iDestLength +=2;

    54       }

    55       if(mUtil.UnicodeToGBKChar(*aSrc, true, &aDest[0], &aDest[1])) {

    56         aDest += 2;	// increment 2 bytes

    57         iDestLength +=2;

    58       } else {

    59         // some thing that we cannot convert

    60         // xxx fix me ftang

    61         // error handling here

    62       }

    63     } else {

    64       // this is an ASCII

    66       // if we are in HZ mode, end it by adding a '~}' ESC sequence

    67       if ( mHZState == HZ_STATE_GB )

    68       {

    69         mHZState = HZ_STATE_ASCII;

    70         aDest[0] = '~';

    71         aDest[1] = '}';

    72         aDest += 2; // increment 2 bytes

    73         iDestLength +=2;

    74       }

    76       // if this is a regular char '~' , convert it to two '~'

    77       if ( *aSrc == UNICODE_TILD )

    78       {

    79         aDest[0] = '~';

    80         aDest[1] = '~';

    81         aDest += 2; // increment 2 bytes

    82         iDestLength +=2;

    83       } else {

    84         // other regular ASCII chars convert by normal ways

    86         // Is this works for both little endian and big endian machines ?

    87         *aDest = (char) ( (char16_t)(*aSrc) );

    88         aDest++; // increment 1 byte

    89         iDestLength +=1;

    90       }

    91     }

    92     aSrc++;	 // increment 2 bytes

    93     if ( iDestLength >= (*aDestLength) )

    94     {

    95       break;

    96     }

    97   }

    98   *aDestLength = iDestLength;

    99   *aSrcLength = i;

   100   return NS_OK;

   101 }

   103 NS_IMETHODIMP nsUnicodeToHZ::FinishNoBuff(char * aDest, int32_t * aDestLength)

   104 {

   105   if ( mHZState == HZ_STATE_GB )

   106   {

   107     // if we are in HZ mode, end it by adding a '~}' ESC sequence

   108     mHZState = HZ_STATE_ASCII;

   109     aDest[0] = '~';

   110     aDest[1] = '}';

   111     *aDestLength = 2;

   112   } else {

   113     *aDestLength = 0;

   114   }

   115   return NS_OK;

   116 }

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