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grl_json_utilities.c
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grl_json_utilities.c
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//
// grl_json_utilities.c
// GRLJSON
//
// Created by Måns Severin on 2010-03-09.
// Copyright 2010 Graphiclife. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
#include "grl_json_utilities.h"
#include <stdlib.h>
#include <string.h>
struct grl_json_string *grl_json_quoted_utf8_strcpy ( struct grl_json_parse_context *context, char *string, long length )
{
struct grl_json_string *json_string = (struct grl_json_string *) grl_json_malloc( context, sizeof(struct grl_json_string) );
unsigned short *buffer = (unsigned short *) grl_json_malloc( context, sizeof(unsigned short) * length );
unsigned short *p, ucs2 = 0;
unsigned long i, j, ucs4 = 0, ucs4_tmp = 0, ucs4_h, ucs4_l;
enum { NORMAL = 0, ESCAPE, UNICODE } state = NORMAL;
int shift, digit, ucs4_state = 0, ucs4_bytes = 1;
char *s, c;
for ( i = 0, s = string, p = buffer ; i < length ; i++ )
{
c = *s++;
switch ( state )
{
case NORMAL:
switch ( c )
{
case '"':
break;
case '\\':
state = ESCAPE;
break;
default:
if ( ucs4_state == 0 )
{
if ( (c & 0x80) == 0 )
{
*p++ = (unsigned short) c;
}
else if ( (0xE0 & c) == 0xC0 )
{
ucs4 = (unsigned long) c;
ucs4 = (ucs4 & 0x1F) << 6;
ucs4_state = 1;
ucs4_bytes = 2;
}
else if ( (0xF0 & c) == 0xE0 )
{
ucs4 = (unsigned long) c;
ucs4 = (ucs4 & 0x0F) << 12;
ucs4_state = 2;
ucs4_bytes = 3;
}
else if ( (0xF8 & c) == 0xF0 )
{
ucs4 = (unsigned long) c;
ucs4 = (ucs4 & 0x07) << 18;
ucs4_state = 3;
ucs4_bytes = 4;
}
else if ( (0xFC & c) == 0xF8 )
{
ucs4 = (unsigned long) c;
ucs4 = (ucs4 & 0x03) << 24;
ucs4_state = 4;
ucs4_bytes = 5;
}
else if ( (0xFE & c) == 0xFC )
{
ucs4 = (unsigned long) c;
ucs4 = (ucs4 & 1) << 30;
ucs4_state = 5;
ucs4_bytes = 6;
}
else
{
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
return NULL;
}
}
else
{
if ( (0xC0 & c) == 0x80 )
{
shift = (ucs4_state - 1) * 6;
ucs4_tmp = (unsigned long) c;
ucs4_tmp = (ucs4_tmp & 0x0000003F) << shift;
ucs4 |= ucs4_tmp;
ucs4_state -= 1;
if ( ucs4_state == 0 )
{
if ( (ucs4_bytes == 2) && (ucs4 < 0x0080) )
{
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
return NULL;
}
if ( (ucs4_bytes == 3) && (ucs4 < 0x0800) )
{
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
return NULL;
}
if ( (ucs4_bytes == 4) && (ucs4 < 0x10000) )
{
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
return NULL;
}
if ( (ucs4_bytes > 4) )
{
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
return NULL;
}
if ( ( (ucs4 & 0xFFFFF800) == 0xD800 ) || (ucs4 > 0x10FFFF) )
{
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
return NULL;
}
if ( ucs4 > 0xFFFF )
{
ucs4_h = ucs4 - 0x10000;
ucs4_l = 0;
for ( j = 0 ; j < 10 ; j++, (ucs4_h >>= 1) )
{
ucs4_l |= (( ucs4_h & 0x1 ) << j);
}
*p++ = (unsigned short) ( 0xD800 | ucs4_h );
*p++ = (unsigned short) ( 0xDC00 | ucs4_l );
}
else if ( ucs4 != 0xFEFF )
{
*p++ = (unsigned short) ucs4;
}
ucs4 = 0;
ucs4_state = 0;
ucs4_bytes = 1;
}
}
else
{
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
return NULL;
}
}
break;
}
break;
case ESCAPE:
switch ( c )
{
case '/':
*p++ = (unsigned short) '/'; state = NORMAL;
break;
case '\\':
*p++ = (unsigned short) '\\'; state = NORMAL;
break;
case '"':
*p++ = (unsigned short) '"'; state = NORMAL;
break;
case 'r':
*p++ = (unsigned short) '\r'; state = NORMAL;
break;
case 'n':
*p++ = (unsigned short) '\n'; state = NORMAL;
break;
case 't':
*p++ = (unsigned short) '\t'; state = NORMAL;
break;
case 'b':
*p++ = (unsigned short) '\b'; state = NORMAL;
break;
case 'f':
*p++ = (unsigned short) '\f'; state = NORMAL;
break;
case 'u':
shift = 12; ucs2 = 0; state = UNICODE;
break;
default:
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
state = NORMAL;
break;
}
break;
case UNICODE:
digit = c - '0';
if ( !( digit >= 0 && digit <= 9 ) )
{
digit = c - 'a';
if ( !( digit >= 0 && digit <= 6 ) )
{
digit = c - 'A';
if ( !( digit >= 0 && digit <= 6 ) )
{
digit = -1;
}
else
{
digit = 10 + digit;
}
}
else
{
digit = 10 + digit;
}
}
if ( digit != -1 )
{
ucs2 |= ( digit << shift );
}
else
{
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
return NULL;
}
shift -= 4;
if ( shift < 0 )
{
*p++ = ucs2;
state = NORMAL;
}
break;
}
}
if ( state != NORMAL )
{
context->issues = grl_json_issue_list( context, grl_json_issue( context, grl_json_issue_code_string ), context->issues );
return NULL;
}
json_string->characters = buffer;
json_string->length = p - buffer;
return json_string;
}
struct grl_json_string *grl_json_strdup ( struct grl_json_parse_context *context, unsigned short *characters, long length )
{
struct grl_json_string *json_string = (struct grl_json_string *) grl_json_malloc( context, sizeof(struct grl_json_string) );
unsigned short *buffer = (unsigned short *) grl_json_malloc( context, sizeof(unsigned short) * length );
memcpy( buffer, characters, length * sizeof( unsigned short ) );
json_string->characters = buffer;
json_string->length = length;
return json_string;
}