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parse_string: Use parsebuffer

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This commit is contained in:
Max Bruckner 2017-03-12 21:44:28 +01:00
parent f69b109c9f
commit 778a0c146f
2 changed files with 36 additions and 26 deletions
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42
cJSON.c
View File

@ -662,17 +662,17 @@ fail:
}
/* Parse the input text into an unescaped cinput, and populate item. */
static const unsigned char *parse_string(cJSON * const item, const unsigned char * const input, const unsigned char ** const error_pointer, const internal_hooks * const hooks)
static const unsigned char *parse_string(cJSON * const item, parse_buffer * const input_buffer, const unsigned char ** const error_pointer, const internal_hooks * const hooks)
{
const unsigned char *input_pointer = input + 1;
const unsigned char *input_end = input + 1;
const unsigned char *input_pointer = buffer_at_offset(input_buffer) + 1;
const unsigned char *input_end = buffer_at_offset(input_buffer) + 1;
unsigned char *output_pointer = NULL;
unsigned char *output = NULL;
/* not a string */
if (*input != '\"')
if (buffer_at_offset(input_buffer)[0] != '\"')
{
*error_pointer = input;
*error_pointer = buffer_at_offset(input_buffer);
goto fail;
}
@ -680,12 +680,12 @@ static const unsigned char *parse_string(cJSON * const item, const unsigned char
/* calculate approximate size of the output (overestimate) */
size_t allocation_length = 0;
size_t skipped_bytes = 0;
while ((*input_end != '\"') && (*input_end != '\0'))
while ((*input_end != '\"') && ((size_t)(input_end - input_buffer->content) < input_buffer->length))
{
/* is escape sequence */
if (input_end[0] == '\\')
{
if (input_end[1] == '\0')
if ((size_t)(input_end + 1 - input_buffer->content) >= input_buffer->length)
{
/* prevent buffer overflow when last input character is a backslash */
goto fail;
@ -695,13 +695,13 @@ static const unsigned char *parse_string(cJSON * const item, const unsigned char
}
input_end++;
}
if (*input_end == '\0')
if (*input_end != '\"')
{
goto fail; /* string ended unexpectedly */
}
/* This is at most how much we need for the output */
allocation_length = (size_t) (input_end - input) - skipped_bytes;
allocation_length = (size_t) (input_end - buffer_at_offset(input_buffer)) - skipped_bytes;
output = (unsigned char*)hooks->allocate(allocation_length + sizeof(""));
if (output == NULL)
{
@ -721,6 +721,11 @@ static const unsigned char *parse_string(cJSON * const item, const unsigned char
else
{
unsigned char sequence_length = 2;
if ((input_end - input_pointer) < 1)
{
goto fail;
}
switch (input_pointer[1])
{
case 'b':
@ -768,7 +773,10 @@ static const unsigned char *parse_string(cJSON * const item, const unsigned char
item->type = cJSON_String;
item->valuestring = (char*)output;
return input_end + 1;
input_buffer->offset = (size_t) (input_end - input_buffer->content);
input_buffer->offset++;
return buffer_at_offset(input_buffer);
fail:
if (output != NULL)
@ -1141,14 +1149,7 @@ static const unsigned char *parse_value(cJSON * const item, parse_buffer * cons
/* string */
if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '\"'))
{
content_pointer = parse_string(item, buffer_at_offset(input_buffer), error_pointer, hooks);
if (content_pointer == NULL)
{
return NULL;
}
input_buffer->offset = (size_t)(content_pointer - input_buffer->content);
return buffer_at_offset(input_buffer);
return content_pointer = parse_string(item, input_buffer, error_pointer, hooks);
}
/* 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'))))
@ -1422,7 +1423,6 @@ static const unsigned char *parse_object(cJSON * const item, parse_buffer * cons
{
cJSON *head = NULL; /* linked list head */
cJSON *current_item = NULL;
const unsigned char *content_pointer = NULL;
if (cannot_access_at_index(input_buffer, 0) || (buffer_at_offset(input_buffer)[0] != '{'))
{
@ -1474,12 +1474,10 @@ static const unsigned char *parse_object(cJSON * const item, parse_buffer * cons
/* parse the name of the child */
input_buffer->offset++;
buffer_skip_whitespace(input_buffer);
content_pointer = parse_string(current_item, buffer_at_offset(input_buffer), error_pointer, hooks);
if (content_pointer == NULL)
if (parse_string(current_item, input_buffer, error_pointer, hooks) == NULL)
{
goto fail; /* faile to parse name */
}
input_buffer->offset = (size_t)(content_pointer - input_buffer->content);
buffer_skip_whitespace(input_buffer);
/* swap valuestring and string, because we parsed the name */

20
tests/parse_string.c
View File

@ -47,16 +47,28 @@ static void assert_is_string(cJSON *string_item)
static void assert_parse_string(const char *string, const char *expected)
{
TEST_ASSERT_NOT_NULL_MESSAGE(parse_string(item, (const unsigned char*)string, &error_pointer, &global_hooks), "Couldn't parse string.");
parse_buffer buffer;
buffer.content = (const unsigned char*)string;
buffer.length = strlen(string) + sizeof("");
buffer.offset = 0;
TEST_ASSERT_NOT_NULL_MESSAGE(parse_string(item, &buffer, &error_pointer, &global_hooks), "Couldn't parse string.");
assert_is_string(item);
TEST_ASSERT_EQUAL_STRING_MESSAGE(expected, item->valuestring, "The parsed result isn't as expected.");
global_hooks.deallocate(item->valuestring);
item->valuestring = NULL;
}
#define assert_not_parse_string(string) \
TEST_ASSERT_NULL_MESSAGE(parse_string(item, (const unsigned char*)string, &error_pointer, &global_hooks), "Malformed string should not be accepted");\
assert_is_invalid(item)
static void assert_not_parse_string(const char * const string)
{
parse_buffer buffer;
buffer.content = (const unsigned char*)string;
buffer.length = strlen(string) + sizeof("");
buffer.offset = 0;
TEST_ASSERT_NULL_MESSAGE(parse_string(item, &buffer, &error_pointer, &global_hooks), "Malformed string should not be accepted.");
assert_is_invalid(item);
}