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parse_value: Check only first character at first

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This should improve performance
This commit is contained in:
Max Bruckner 2018-01-31 10:31:14 +01:00
parent a2ede77ee0
commit 4e9154458d
1 changed files with 66 additions and 42 deletions
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108
cJSON.c
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@ -1214,51 +1214,75 @@ static cJSON_bool parse_value(cJSON * const item, parse_buffer * const input_buf
return false; /* no input */ return false; /* no input */
} }
/* parse the different types of values */ if (!can_read(input_buffer, 1))
/* null */
if (can_read(input_buffer, 4) && (strncmp((const char*)buffer_at_offset(input_buffer), "null", 4) == 0))
{ {
item->type = cJSON_NULL; return false;
input_buffer->offset += 4;
return true;
}
/* false */
if (can_read(input_buffer, 5) && (strncmp((const char*)buffer_at_offset(input_buffer), "false", 5) == 0))
{
item->type = cJSON_False;
input_buffer->offset += 5;
return true;
}
/* true */
if (can_read(input_buffer, 4) && (strncmp((const char*)buffer_at_offset(input_buffer), "true", 4) == 0))
{
item->type = cJSON_True;
item->valueint = 1;
input_buffer->offset += 4;
return true;
}
/* string */
if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '\"'))
{
return parse_string(item, input_buffer);
}
/* number */
if (can_access_at_index(input_buffer, 0) && ((buffer_at_offset(input_buffer)[0] == '-') || ((buffer_at_offset(input_buffer)[0] >= '0') && (buffer_at_offset(input_buffer)[0] <= '9'))))
{
return parse_number(item, input_buffer);
}
/* array */
if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '['))
{
return parse_array(item, input_buffer);
}
/* object */
if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '{'))
{
return parse_object(item, input_buffer);
} }
return false; /* parse the different types of values */
switch (buffer_at_offset(input_buffer)[0])
{
/* number */
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return parse_number(item, input_buffer);
/* string */
case '\"':
return parse_string(item, input_buffer);
/* array */
case '[':
return parse_array(item, input_buffer);
/* object */
case '{':
return parse_object(item, input_buffer);
/* null */
case 'n':
if (can_read(input_buffer, 4) && (strncmp((const char*)buffer_at_offset(input_buffer), "null", 4) == 0))
{
item->type = cJSON_NULL;
input_buffer->offset += 4;
return true;
}
return false;
/* true */
case 't':
if (can_read(input_buffer, 4) && (strncmp((const char*)buffer_at_offset(input_buffer), "true", 4) == 0))
{
item->type = cJSON_True;
item->valueint = 1;
input_buffer->offset += 4;
return true;
}
return false;
/* false */
case 'f':
if (can_read(input_buffer, 5) && (strncmp((const char*)buffer_at_offset(input_buffer), "false", 5) == 0))
{
item->type = cJSON_False;
input_buffer->offset += 5;
return true;
}
return false;
default:
return false;
}
} }
/* Render a value to text. */ /* Render a value to text. */