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parser: Construct error pointer from buffer offset

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This commit is contained in:
Max Bruckner 2017-03-21 21:41:37 +01:00
parent c837177a56
commit 2683589d93
8 changed files with 49 additions and 72 deletions
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91
cJSON.c
View File

@ -535,7 +535,7 @@ static unsigned parse_hex4(const unsigned char * const input)
/* converts a UTF-16 literal to UTF-8
* A literal can be one or two sequences of the form \uXXXX */
static unsigned char utf16_literal_to_utf8(const unsigned char * const input_pointer, const unsigned char * const input_end, unsigned char **output_pointer, const unsigned char **error_pointer)
static unsigned char utf16_literal_to_utf8(const unsigned char * const input_pointer, const unsigned char * const input_end, unsigned char **output_pointer)
{
long unsigned int codepoint = 0;
unsigned int first_code = 0;
@ -548,7 +548,6 @@ static unsigned char utf16_literal_to_utf8(const unsigned char * const input_poi
if ((input_end - first_sequence) < 6)
{
/* input ends unexpectedly */
*error_pointer = first_sequence;
goto fail;
}
@ -558,7 +557,6 @@ static unsigned char utf16_literal_to_utf8(const unsigned char * const input_poi
/* check that the code is valid */
if (((first_code >= 0xDC00) && (first_code <= 0xDFFF)))
{
*error_pointer = first_sequence;
goto fail;
}
@ -572,14 +570,12 @@ static unsigned char utf16_literal_to_utf8(const unsigned char * const input_poi
if ((input_end - second_sequence) < 6)
{
/* input ends unexpectedly */
*error_pointer = first_sequence;
goto fail;
}
if ((second_sequence[0] != '\\') || (second_sequence[1] != 'u'))
{
/* missing second half of the surrogate pair */
*error_pointer = first_sequence;
goto fail;
}
@ -589,7 +585,6 @@ static unsigned char utf16_literal_to_utf8(const unsigned char * const input_poi
if ((second_code < 0xDC00) || (second_code > 0xDFFF))
{
/* invalid second half of the surrogate pair */
*error_pointer = first_sequence;
goto fail;
}
@ -632,7 +627,6 @@ static unsigned char utf16_literal_to_utf8(const unsigned char * const input_poi
else
{
/* invalid unicode codepoint */
*error_pointer = first_sequence;
goto fail;
}
@ -662,7 +656,7 @@ fail:
}
/* Parse the input text into an unescaped cinput, and populate item. */
static cJSON_bool parse_string(cJSON * const item, parse_buffer * const input_buffer, const unsigned char ** const error_pointer, const internal_hooks * const hooks)
static cJSON_bool parse_string(cJSON * const item, parse_buffer * const input_buffer, const internal_hooks * const hooks)
{
const unsigned char *input_pointer = buffer_at_offset(input_buffer) + 1;
const unsigned char *input_end = buffer_at_offset(input_buffer) + 1;
@ -672,7 +666,6 @@ static cJSON_bool parse_string(cJSON * const item, parse_buffer * const input_bu
/* not a string */
if (buffer_at_offset(input_buffer)[0] != '\"')
{
*error_pointer = buffer_at_offset(input_buffer);
goto fail;
}
@ -751,7 +744,7 @@ static cJSON_bool parse_string(cJSON * const item, parse_buffer * const input_bu
/* UTF-16 literal */
case 'u':
sequence_length = utf16_literal_to_utf8(input_pointer, input_end, &output_pointer, error_pointer);
sequence_length = utf16_literal_to_utf8(input_pointer, input_end, &output_pointer);
if (sequence_length == 0)
{
/* failed to convert UTF16-literal to UTF-8 */
@ -760,7 +753,6 @@ static cJSON_bool parse_string(cJSON * const item, parse_buffer * const input_bu
break;
default:
*error_pointer = input_pointer;
goto fail;
}
input_pointer += sequence_length;
@ -784,6 +776,11 @@ fail:
hooks->deallocate(output);
}
if (input_pointer != NULL)
{
input_buffer->offset = (size_t)(input_pointer - input_buffer->content);
}
return false;
}
@ -916,11 +913,11 @@ static cJSON_bool print_string(const cJSON * const item, printbuffer * const p,
}
/* Predeclare these prototypes. */
static cJSON_bool parse_value(cJSON * const item, parse_buffer * const input_buffer, const unsigned char ** const ep, const internal_hooks * const hooks);
static cJSON_bool parse_value(cJSON * const item, parse_buffer * const input_buffer, const internal_hooks * const hooks);
static cJSON_bool print_value(const cJSON * const item, const size_t depth, const cJSON_bool format, printbuffer * const output_buffer, const internal_hooks * const hooks);
static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buffer, const unsigned char ** const ep, const internal_hooks * const hooks);
static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buffer, const internal_hooks * const hooks);
static cJSON_bool print_array(const cJSON * const item, const size_t depth, const cJSON_bool format, printbuffer * const output_buffer, const internal_hooks * const hooks);
static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_buffer, const unsigned char ** const ep, const internal_hooks * const hooks);
static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_buffer, const internal_hooks * const hooks);
static cJSON_bool print_object(const cJSON * const item, const size_t depth, const cJSON_bool format, printbuffer * const output_buffer, const internal_hooks * const hooks);
/* Utility to jump whitespace and cr/lf */
@ -951,15 +948,8 @@ CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return
/* use global error pointer if no specific one was given */
const unsigned char **error_pointer = (return_parse_end != NULL) ? (const unsigned char**)return_parse_end : &global_ep;
cJSON *item = NULL;
*error_pointer = NULL;
item = cJSON_New_Item(&global_hooks);
if (item == NULL) /* memory fail */
{
goto fail;
}
if (value == NULL)
{
goto fail;
@ -969,7 +959,13 @@ CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return
buffer.length = strlen((const char*)value) + sizeof("");
buffer.offset = 0;
if (!parse_value(item, buffer_skip_whitespace(&buffer), error_pointer, &global_hooks))
item = cJSON_New_Item(&global_hooks);
if (item == NULL) /* memory fail */
{
goto fail;
}
if (!parse_value(item, buffer_skip_whitespace(&buffer), &global_hooks))
{
/* parse failure. ep is set. */
goto fail;
@ -981,7 +977,6 @@ CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return
buffer_skip_whitespace(&buffer);
if ((buffer.offset >= buffer.length) || buffer_at_offset(&buffer)[0] != '\0')
{
*error_pointer = buffer_at_offset(&buffer);
goto fail;
}
}
@ -998,6 +993,18 @@ fail:
cJSON_Delete(item);
}
if (value != NULL)
{
if (buffer.offset < buffer.length)
{
*error_pointer = buffer_at_offset(&buffer);
}
else if (buffer.length > 0)
{
*error_pointer = buffer.content + buffer.length - 1;
}
}
return NULL;
}
@ -1113,7 +1120,7 @@ CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON *item, char *buf, const i
}
/* Parser core - when encountering text, process appropriately. */
static cJSON_bool parse_value(cJSON * const item, parse_buffer * const input_buffer, const unsigned char ** const error_pointer, const internal_hooks * const hooks)
static cJSON_bool parse_value(cJSON * const item, parse_buffer * const input_buffer, const internal_hooks * const hooks)
{
if ((input_buffer == NULL) || (input_buffer->content == NULL))
{
@ -1146,7 +1153,7 @@ static cJSON_bool parse_value(cJSON * const item, parse_buffer * const input_buf
/* string */
if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '\"'))
{
return parse_string(item, input_buffer, error_pointer, hooks);
return parse_string(item, input_buffer, 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'))))
@ -1156,27 +1163,14 @@ static cJSON_bool parse_value(cJSON * const item, parse_buffer * const input_buf
/* array */
if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '['))
{
return parse_array(item, input_buffer, error_pointer, hooks);
return parse_array(item, input_buffer, hooks);
}
/* object */
if (can_access_at_index(input_buffer, 0) && (buffer_at_offset(input_buffer)[0] == '{'))
{
return parse_object(item, input_buffer, error_pointer, hooks);
return parse_object(item, input_buffer, hooks);
}
/* failure. */
if (can_access_at_index(input_buffer, 0))
{
*error_pointer = buffer_at_offset(input_buffer);
}
else if (input_buffer->length > 0)
{
*error_pointer = input_buffer->content + input_buffer->length - 1;
}
else
{
*error_pointer = input_buffer->content;
}
return false;
}
@ -1260,7 +1254,7 @@ static cJSON_bool print_value(const cJSON * const item, const size_t depth, cons
}
/* Build an array from input text. */
static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buffer, const unsigned char ** const error_pointer, const internal_hooks * const hooks)
static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buffer, const internal_hooks * const hooks)
{
cJSON *head = NULL; /* head of the linked list */
cJSON *current_item = NULL;
@ -1268,7 +1262,6 @@ static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buf
if (buffer_at_offset(input_buffer)[0] != '[')
{
/* not an array */
*error_pointer = buffer_at_offset(input_buffer);
goto fail;
}
@ -1284,7 +1277,6 @@ static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buf
if (cannot_access_at_index(input_buffer, 0))
{
input_buffer->offset--;
*error_pointer = buffer_at_offset(input_buffer);
goto fail;
}
@ -1317,7 +1309,7 @@ static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buf
/* parse next value */
input_buffer->offset++;
buffer_skip_whitespace(input_buffer);
if (!parse_value(current_item, input_buffer, error_pointer, hooks))
if (!parse_value(current_item, input_buffer, hooks))
{
goto fail; /* failed to parse value */
}
@ -1327,7 +1319,6 @@ static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buf
if (cannot_access_at_index(input_buffer, 0) || buffer_at_offset(input_buffer)[0] != ']')
{
*error_pointer = buffer_at_offset(input_buffer);
goto fail; /* expected end of array */
}
@ -1409,14 +1400,13 @@ static cJSON_bool print_array(const cJSON * const item, const size_t depth, cons
}
/* Build an object from the text. */
static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_buffer, const unsigned char ** const error_pointer, const internal_hooks * const hooks)
static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_buffer, const internal_hooks * const hooks)
{
cJSON *head = NULL; /* linked list head */
cJSON *current_item = NULL;
if (cannot_access_at_index(input_buffer, 0) || (buffer_at_offset(input_buffer)[0] != '{'))
{
*error_pointer = buffer_at_offset(input_buffer);
goto fail; /* not an object */
}
@ -1431,7 +1421,6 @@ static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_bu
if (cannot_access_at_index(input_buffer, 0))
{
input_buffer->offset--;
*error_pointer = buffer_at_offset(input_buffer);
goto fail;
}
@ -1464,7 +1453,7 @@ static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_bu
/* parse the name of the child */
input_buffer->offset++;
buffer_skip_whitespace(input_buffer);
if (!parse_string(current_item, input_buffer, error_pointer, hooks))
if (!parse_string(current_item, input_buffer, hooks))
{
goto fail; /* faile to parse name */
}
@ -1476,14 +1465,13 @@ static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_bu
if (cannot_access_at_index(input_buffer, 0) || (buffer_at_offset(input_buffer)[0] != ':'))
{
*error_pointer = buffer_at_offset(input_buffer);
goto fail; /* invalid object */
}
/* parse the value */
input_buffer->offset++;
buffer_skip_whitespace(input_buffer);
if (!parse_value(current_item, input_buffer, error_pointer, hooks))
if (!parse_value(current_item, input_buffer, hooks))
{
goto fail; /* failed to parse value */
}
@ -1493,7 +1481,6 @@ static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_bu
if (cannot_access_at_index(input_buffer, 0) || (buffer_at_offset(input_buffer)[0] != '}'))
{
*error_pointer = buffer_at_offset(input_buffer);
goto fail; /* expected end of object */
}

6
tests/parse_array.c
View File

@ -30,8 +30,6 @@
static cJSON item[1];
static const unsigned char *error_pointer = NULL;
static void assert_is_array(cJSON *array_item)
{
TEST_ASSERT_NOT_NULL_MESSAGE(array_item, "Item is NULL.");
@ -51,7 +49,7 @@ static void assert_not_array(const char *json)
buffer.length = strlen(json) + sizeof("");
buffer.offset = 0;
TEST_ASSERT_FALSE(parse_array(item, &buffer, &error_pointer, &global_hooks));
TEST_ASSERT_FALSE(parse_array(item, &buffer, &global_hooks));
assert_is_invalid(item);
}
@ -62,7 +60,7 @@ static void assert_parse_array(const char *json)
buffer.length = strlen(json) + sizeof("");
buffer.offset = 0;
TEST_ASSERT_TRUE(parse_array(item, &buffer, &error_pointer, &global_hooks));
TEST_ASSERT_TRUE(parse_array(item, &buffer, &global_hooks));
assert_is_array(item);
}

6
tests/parse_object.c
View File

@ -30,8 +30,6 @@
static cJSON item[1];
static const unsigned char *error_pointer = NULL;
static void assert_is_object(cJSON *object_item)
{
TEST_ASSERT_NOT_NULL_MESSAGE(object_item, "Item is NULL.");
@ -59,7 +57,7 @@ static void assert_not_object(const char *json)
parsebuffer.length = strlen(json) + sizeof("");
parsebuffer.offset = 0;
TEST_ASSERT_FALSE(parse_object(item, &parsebuffer, &error_pointer, &global_hooks));
TEST_ASSERT_FALSE(parse_object(item, &parsebuffer, &global_hooks));
assert_is_invalid(item);
reset(item);
}
@ -71,7 +69,7 @@ static void assert_parse_object(const char *json)
parsebuffer.length = strlen(json) + sizeof("");
parsebuffer.offset = 0;
TEST_ASSERT_TRUE(parse_object(item, &parsebuffer, &error_pointer, &global_hooks));
TEST_ASSERT_TRUE(parse_object(item, &parsebuffer, &global_hooks));
assert_is_object(item);
}

6
tests/parse_string.c
View File

@ -30,8 +30,6 @@
static cJSON item[1];
static const unsigned char *error_pointer = NULL;
static void assert_is_string(cJSON *string_item)
{
TEST_ASSERT_NOT_NULL_MESSAGE(string_item, "Item is NULL.");
@ -52,7 +50,7 @@ static void assert_parse_string(const char *string, const char *expected)
buffer.length = strlen(string) + sizeof("");
buffer.offset = 0;
TEST_ASSERT_TRUE_MESSAGE(parse_string(item, &buffer, &error_pointer, &global_hooks), "Couldn't parse string.");
TEST_ASSERT_TRUE_MESSAGE(parse_string(item, &buffer, &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);
@ -66,7 +64,7 @@ static void assert_not_parse_string(const char * const string)
buffer.length = strlen(string) + sizeof("");
buffer.offset = 0;
TEST_ASSERT_FALSE_MESSAGE(parse_string(item, &buffer, &error_pointer, &global_hooks), "Malformed string should not be accepted.");
TEST_ASSERT_FALSE_MESSAGE(parse_string(item, &buffer, &global_hooks), "Malformed string should not be accepted.");
assert_is_invalid(item);
}

3
tests/parse_value.c
View File

@ -29,7 +29,6 @@
#include "common.h"
static cJSON item[1];
const unsigned char *error_pointer = NULL;
static void assert_is_value(cJSON *value_item, int type)
{
@ -48,7 +47,7 @@ static void assert_parse_value(const char *string, int type)
buffer.content = (const unsigned char*) string;
buffer.length = strlen(string) + sizeof("");
buffer.offset = 0;
TEST_ASSERT_TRUE(parse_value(item, &buffer, &error_pointer, &global_hooks));
TEST_ASSERT_TRUE(parse_value(item, &buffer, &global_hooks));
assert_is_value(item, type);
}

3
tests/print_array.c
View File

@ -29,7 +29,6 @@ static void assert_print_array(const char * const expected, const char * const i
unsigned char printed_unformatted[1024];
unsigned char printed_formatted[1024];
const unsigned char *error_pointer;
cJSON item[1];
printbuffer formatted_buffer;
@ -53,7 +52,7 @@ static void assert_print_array(const char * const expected, const char * const i
unformatted_buffer.noalloc = true;
memset(item, 0, sizeof(item));
TEST_ASSERT_TRUE_MESSAGE(parse_array(item, &parsebuffer, &error_pointer, &global_hooks), "Failed to parse array.");
TEST_ASSERT_TRUE_MESSAGE(parse_array(item, &parsebuffer, &global_hooks), "Failed to parse array.");
TEST_ASSERT_TRUE_MESSAGE(print_array(item, 0, false, &unformatted_buffer, &global_hooks), "Failed to print unformatted string.");
TEST_ASSERT_EQUAL_STRING_MESSAGE(input, printed_unformatted, "Unformatted array is not correct.");

3
tests/print_object.c
View File

@ -29,7 +29,6 @@ static void assert_print_object(const char * const expected, const char * const
unsigned char printed_unformatted[1024];
unsigned char printed_formatted[1024];
const unsigned char *error_pointer;
cJSON item[1];
printbuffer formatted_buffer;
@ -54,7 +53,7 @@ static void assert_print_object(const char * const expected, const char * const
unformatted_buffer.noalloc = true;
memset(item, 0, sizeof(item));
TEST_ASSERT_TRUE_MESSAGE(parse_object(item, &parsebuffer, &error_pointer, &global_hooks), "Failed to parse object.");
TEST_ASSERT_TRUE_MESSAGE(parse_object(item, &parsebuffer, &global_hooks), "Failed to parse object.");
TEST_ASSERT_TRUE_MESSAGE(print_object(item, 0, false, &unformatted_buffer, &global_hooks), "Failed to print unformatted string.");
TEST_ASSERT_EQUAL_STRING_MESSAGE(input, printed_unformatted, "Unformatted object is not correct.");

3
tests/print_value.c
View File

@ -31,7 +31,6 @@
static void assert_print_value(const char *input)
{
unsigned char printed[1024];
const unsigned char *error_pointer = NULL;
cJSON item[1];
printbuffer buffer;
parse_buffer parsebuffer;
@ -46,7 +45,7 @@ static void assert_print_value(const char *input)
memset(item, 0, sizeof(item));
TEST_ASSERT_TRUE_MESSAGE(parse_value(item, &parsebuffer, &error_pointer, &global_hooks), "Failed to parse value.");
TEST_ASSERT_TRUE_MESSAGE(parse_value(item, &parsebuffer, &global_hooks), "Failed to parse value.");
TEST_ASSERT_TRUE_MESSAGE(print_value(item, 0, false, &buffer, &global_hooks), "Failed to print value.");
TEST_ASSERT_EQUAL_STRING_MESSAGE(input, buffer.buffer, "Printed value is not as expected.");