819 lines
31 KiB
C
819 lines
31 KiB
C
/* vim: set et ts=3 sw=3 sts=3 ft=c:
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*
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* Copyright (C) 2012-2021 the json-parser authors All rights reserved.
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* https://github.com/json-parser/json-parser
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "json.h"
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#include <ctype.h>
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#include <limits.h>
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#include <math.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../util/hex.h"
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#define JSON_INT_MAX 9223372036854775807LL
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typedef unsigned int json_uchar;
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const struct _json_value json_value_none = { 0 };
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static int would_overflow(json_int_t value, json_char b) { return ((JSON_INT_MAX - (b - '0')) / 10) < value; }
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typedef struct {
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size_t used_memory;
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json_settings settings;
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int first_pass;
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const json_char *ptr;
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unsigned int cur_line, cur_col;
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} json_state;
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static void *default_alloc(size_t size, int zero) { return zero ? calloc(1, size) : malloc(size); }
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static void *json_alloc(json_state *state, size_t size, int zero) {
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if ((ULONG_MAX - 8 - state->used_memory) < size) return 0;
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if (state->settings.max_memory && (state->used_memory += size) > state->settings.max_memory) {
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return 0;
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}
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return default_alloc(size, zero);
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}
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static int new_value(json_state *state, json_value **top, json_value **root, json_value **alloc, json_type type) {
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json_value *value;
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size_t values_size;
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if (!state->first_pass) {
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value = *top = *alloc;
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*alloc = (*alloc)->_reserved.next_alloc;
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if (!*root) *root = value;
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switch (value->type) {
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case json_array:
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if (value->u.array.length == 0) break;
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if (!(value->u.array.values =
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(json_value **)json_alloc(state, value->u.array.length * sizeof(json_value *), 0))) {
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return 0;
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}
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value->u.array.length = 0;
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break;
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case json_object:
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if (value->u.object.length == 0) break;
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values_size = sizeof(*value->u.object.values) * value->u.object.length;
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if (!(value->u.object.values = (json_object_entry *)json_alloc(
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state, values_size + ((uintptr_t)value->u.object.values), 0))) {
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return 0;
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}
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value->_reserved.object_mem = (void *)(((char *)value->u.object.values) + values_size);
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value->u.object.length = 0;
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break;
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case json_string:
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if (!(value->u.string.ptr =
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(json_char *)json_alloc(state, (value->u.string.length + 1) * sizeof(json_char), 0))) {
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return 0;
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}
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value->u.string.length = 0;
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break;
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default:
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break;
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};
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return 1;
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}
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if (!(value = (json_value *)json_alloc(state, sizeof(json_value) + state->settings.value_extra, 1))) {
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return 0;
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}
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if (!*root) *root = value;
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value->type = type;
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value->parent = *top;
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#ifdef JSON_TRACK_SOURCE
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value->line = state->cur_line;
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value->col = state->cur_col;
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#endif
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if (*alloc) (*alloc)->_reserved.next_alloc = value;
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*alloc = *top = value;
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return 1;
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}
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#define whitespace \
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case '\n': \
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++state.cur_line; \
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state.cur_col = 0; /* FALLTHRU */ \
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case ' ': /* FALLTHRU */ \
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case '\t': /* FALLTHRU */ \
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case '\r'
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#define string_add(b) \
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do { \
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if (!state.first_pass) string[string_length] = b; \
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++string_length; \
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} while (0);
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#define line_and_col state.cur_line, state.cur_col
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static const long flag_next = 1 << 0, flag_reproc = 1 << 1, flag_need_comma = 1 << 2, flag_seek_value = 1 << 3,
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flag_escaped = 1 << 4, flag_string = 1 << 5, flag_need_colon = 1 << 6, flag_done = 1 << 7,
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flag_num_negative = 1 << 8, flag_num_zero = 1 << 9, flag_num_e = 1 << 10,
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flag_num_e_got_sign = 1 << 11, flag_num_e_negative = 1 << 12, flag_line_comment = 1 << 13,
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flag_block_comment = 1 << 14, flag_num_got_decimal = 1 << 15;
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json_value *json_parse_ex(json_settings *settings, const json_char *json, size_t length, char *error_buf) {
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char error[json_error_max];
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const json_char *end;
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json_value *top, *root, *alloc = 0;
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json_state state = {0};
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long flags = 0;
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int num_digits = 0;
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double num_e = 0, num_fraction = 0;
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/* Skip UTF-8 BOM
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*/
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if (length >= 3 && ((unsigned char)json[0]) == 0xEF && ((unsigned char)json[1]) == 0xBB &&
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((unsigned char)json[2]) == 0xBF) {
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json += 3;
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length -= 3;
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}
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error[0] = '\0';
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end = (json + length);
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memcpy(&state.settings, settings, sizeof(json_settings));
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for (state.first_pass = 1; state.first_pass >= 0; --state.first_pass) {
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json_uchar uchar;
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unsigned char uc_b1, uc_b2, uc_b3, uc_b4;
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json_char *string = 0;
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unsigned int string_length = 0;
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top = root = 0;
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flags = flag_seek_value;
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state.cur_line = 1;
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for (state.ptr = json;; ++state.ptr) {
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json_char b = (state.ptr == end ? 0 : *state.ptr);
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if (flags & flag_string) {
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if (!b) {
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snprintf(error, json_error_max, "%u:%u: Unexpected EOF in string", line_and_col);
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goto e_failed;
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}
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if (string_length > UINT_MAX - 8) goto e_overflow;
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if (flags & flag_escaped) {
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flags &= ~flag_escaped;
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switch (b) {
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case 'b':
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string_add('\b');
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break;
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case 'f':
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string_add('\f');
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break;
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case 'n':
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string_add('\n');
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break;
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case 'r':
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string_add('\r');
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break;
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case 't':
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string_add('\t');
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break;
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case 'u':
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if (end - state.ptr <= 4 || (uc_b1 = hex_value(*++state.ptr)) == 0xFF ||
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(uc_b2 = hex_value(*++state.ptr)) == 0xFF ||
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(uc_b3 = hex_value(*++state.ptr)) == 0xFF ||
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(uc_b4 = hex_value(*++state.ptr)) == 0xFF) {
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snprintf(error, json_error_max, "%u:%u: Invalid character value `%c`", line_and_col, b);
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goto e_failed;
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}
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uc_b1 = (uc_b1 << 4) | uc_b2;
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uc_b2 = (uc_b3 << 4) | uc_b4;
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uchar = (uc_b1 << 8) | uc_b2;
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if ((uchar & 0xF800) == 0xD800) {
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json_uchar uchar2;
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if (end - state.ptr <= 6 || (*++state.ptr) != '\\' || (*++state.ptr) != 'u' ||
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(uc_b1 = hex_value(*++state.ptr)) == 0xFF ||
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(uc_b2 = hex_value(*++state.ptr)) == 0xFF ||
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(uc_b3 = hex_value(*++state.ptr)) == 0xFF ||
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(uc_b4 = hex_value(*++state.ptr)) == 0xFF) {
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snprintf(error, json_error_max, "%u:%u: Invalid character value `%c`", line_and_col,
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b);
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goto e_failed;
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}
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uc_b1 = (uc_b1 << 4) | uc_b2;
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uc_b2 = (uc_b3 << 4) | uc_b4;
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uchar2 = (uc_b1 << 8) | uc_b2;
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uchar = 0x010000 | ((uchar & 0x3FF) << 10) | (uchar2 & 0x3FF);
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}
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if (sizeof(json_char) >= sizeof(json_uchar) || (uchar <= 0x7F)) {
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string_add((json_char)uchar);
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break;
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}
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if (uchar <= 0x7FF) {
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if (state.first_pass)
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string_length += 2;
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else {
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string[string_length++] = (char)(0xC0 | (uchar >> 6));
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string[string_length++] = (char)(0x80 | (uchar & 0x3F));
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}
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break;
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}
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if (uchar <= 0xFFFF) {
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if (state.first_pass)
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string_length += 3;
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else {
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string[string_length++] = 0xE0 | (char)((uchar >> 12));
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string[string_length++] = 0x80 | (char)(((uchar >> 6) & 0x3F));
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string[string_length++] = 0x80 | (char)((uchar & 0x3F));
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}
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break;
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}
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if (state.first_pass)
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string_length += 4;
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else {
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string[string_length++] = 0xF0 | (char)((uchar >> 18));
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string[string_length++] = 0x80 | (char)(((uchar >> 12) & 0x3F));
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string[string_length++] = 0x80 | (char)(((uchar >> 6) & 0x3F));
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string[string_length++] = 0x80 | (char)((uchar & 0x3F));
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}
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break;
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default:
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string_add(b);
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};
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continue;
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}
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if (b == '\\') {
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flags |= flag_escaped;
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continue;
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}
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if (b == '"') {
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if (!state.first_pass) string[string_length] = 0;
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flags &= ~flag_string;
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string = 0;
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switch (top->type) {
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case json_string:
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top->u.string.length = string_length;
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flags |= flag_next;
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break;
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case json_object:
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if (state.first_pass) {
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json_char **chars = (json_char **)&top->u.object.values;
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chars[0] += string_length + 1;
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} else {
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top->u.object.values[top->u.object.length].name =
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(json_char *)top->_reserved.object_mem;
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top->u.object.values[top->u.object.length].name_length = string_length;
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(*(json_char **)&top->_reserved.object_mem) += string_length + 1;
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}
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flags |= flag_seek_value | flag_need_colon;
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continue;
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default:
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break;
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};
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} else {
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string_add(b);
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continue;
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}
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}
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if (state.settings.settings & json_enable_comments) {
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if (flags & (flag_line_comment | flag_block_comment)) {
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if (flags & flag_line_comment) {
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if (b == '\r' || b == '\n' || !b) {
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flags &= ~flag_line_comment;
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--state.ptr; /* so null can be reproc'd */
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}
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continue;
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}
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if (flags & flag_block_comment) {
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if (!b) {
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snprintf(error, json_error_max, "%u:%u: Unexpected EOF in block comment", line_and_col);
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goto e_failed;
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}
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if (b == '*' && state.ptr < (end - 1) && state.ptr[1] == '/') {
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flags &= ~flag_block_comment;
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++state.ptr; /* skip closing sequence */
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}
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continue;
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}
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} else if (b == '/') {
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if (!(flags & (flag_seek_value | flag_done)) && top->type != json_object) {
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snprintf(error, json_error_max, "%u:%u: Comment not allowed here", line_and_col);
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goto e_failed;
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}
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if (++state.ptr == end) {
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snprintf(error, json_error_max, "%u:%u: EOF unexpected", line_and_col);
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goto e_failed;
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}
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switch (b = *state.ptr) {
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case '/':
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flags |= flag_line_comment;
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continue;
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case '*':
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flags |= flag_block_comment;
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continue;
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default:
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snprintf(error, json_error_max, "%u:%u: Unexpected `%c` in comment opening sequence",
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line_and_col, b);
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goto e_failed;
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};
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}
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}
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if (flags & flag_done) {
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if (!b) break;
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switch (b) {
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whitespace:
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continue;
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default:
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snprintf(error, json_error_max, "%u:%u: Trailing garbage: `%c`", line_and_col, b);
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goto e_failed;
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};
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}
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|
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if (flags & flag_seek_value) {
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switch (b) {
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whitespace:
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continue;
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case ']':
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if (top && top->type == json_array)
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flags = (flags & ~(flag_need_comma | flag_seek_value)) | flag_next;
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else {
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snprintf(error, json_error_max, "%u:%u: Unexpected `]`", line_and_col);
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goto e_failed;
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}
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break;
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default:
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if (flags & flag_need_comma) {
|
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if (b == ',') {
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flags &= ~flag_need_comma;
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continue;
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} else {
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snprintf(error, json_error_max, "%u:%u: Expected `,` before `%c`", line_and_col, b);
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goto e_failed;
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}
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}
|
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|
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if (flags & flag_need_colon) {
|
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if (b == ':') {
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flags &= ~flag_need_colon;
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continue;
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} else {
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snprintf(error, json_error_max, "%u:%u: Expected `:` before `%c`", line_and_col, b);
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goto e_failed;
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}
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}
|
|
|
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flags &= ~flag_seek_value;
|
|
|
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switch (b) {
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case '{':
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if (!new_value(&state, &top, &root, &alloc, json_object)) goto e_alloc_failure;
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continue;
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|
|
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case '[':
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if (!new_value(&state, &top, &root, &alloc, json_array)) goto e_alloc_failure;
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|
|
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flags |= flag_seek_value;
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continue;
|
|
|
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case '"':
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if (!new_value(&state, &top, &root, &alloc, json_string)) goto e_alloc_failure;
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|
|
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flags |= flag_string;
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|
|
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string = top->u.string.ptr;
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string_length = 0;
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|
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continue;
|
|
|
|
case 't':
|
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if ((end - state.ptr) <= 3 || *(++state.ptr) != 'r' || *(++state.ptr) != 'u' ||
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*(++state.ptr) != 'e') {
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goto e_unknown_value;
|
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}
|
|
|
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if (!new_value(&state, &top, &root, &alloc, json_boolean)) goto e_alloc_failure;
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|
|
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top->u.boolean = 1;
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|
|
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flags |= flag_next;
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break;
|
|
|
|
case 'f':
|
|
if ((end - state.ptr) <= 4 || *(++state.ptr) != 'a' || *(++state.ptr) != 'l' ||
|
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*(++state.ptr) != 's' || *(++state.ptr) != 'e') {
|
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goto e_unknown_value;
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}
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|
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if (!new_value(&state, &top, &root, &alloc, json_boolean)) goto e_alloc_failure;
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|
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flags |= flag_next;
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break;
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|
|
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case 'n':
|
|
if ((end - state.ptr) <= 3 || *(++state.ptr) != 'u' || *(++state.ptr) != 'l' ||
|
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*(++state.ptr) != 'l') {
|
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goto e_unknown_value;
|
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}
|
|
|
|
if (!new_value(&state, &top, &root, &alloc, json_null)) goto e_alloc_failure;
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|
|
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flags |= flag_next;
|
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break;
|
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default:
|
|
if (isdigit((unsigned char)b) || b == '-') {
|
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if (!new_value(&state, &top, &root, &alloc, json_integer)) goto e_alloc_failure;
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|
|
|
if (!state.first_pass) {
|
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while (isdigit((unsigned char)b) || b == '+' || b == '-' || b == 'e' ||
|
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b == 'E' || b == '.') {
|
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if ((++state.ptr) == end) {
|
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b = 0;
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break;
|
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}
|
|
|
|
b = *state.ptr;
|
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}
|
|
|
|
flags |= flag_next | flag_reproc;
|
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break;
|
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}
|
|
|
|
flags &= ~(flag_num_negative | flag_num_e | flag_num_e_got_sign |
|
|
flag_num_e_negative | flag_num_zero);
|
|
|
|
num_digits = 0;
|
|
num_fraction = 0;
|
|
num_e = 0;
|
|
|
|
if (b != '-') {
|
|
flags |= flag_reproc;
|
|
break;
|
|
}
|
|
|
|
flags |= flag_num_negative;
|
|
continue;
|
|
} else {
|
|
snprintf(error, json_error_max, "%u:%u: Unexpected `%c` when seeking value",
|
|
line_and_col, b);
|
|
goto e_failed;
|
|
}
|
|
};
|
|
};
|
|
} else {
|
|
switch (top->type) {
|
|
case json_object:
|
|
switch (b) {
|
|
whitespace:
|
|
continue;
|
|
case '"':
|
|
if (flags & flag_need_comma) {
|
|
snprintf(error, json_error_max, "%u:%u: Expected `,` before `\"`", line_and_col);
|
|
goto e_failed;
|
|
}
|
|
|
|
flags |= flag_string;
|
|
|
|
string = (json_char *)top->_reserved.object_mem;
|
|
string_length = 0;
|
|
|
|
break;
|
|
|
|
case '}':
|
|
flags = (flags & ~flag_need_comma) | flag_next;
|
|
break;
|
|
|
|
case ',':
|
|
if (flags & flag_need_comma) {
|
|
flags &= ~flag_need_comma;
|
|
break;
|
|
} /* FALLTHRU */
|
|
|
|
default:
|
|
snprintf(error, json_error_max, "%u:%u: Unexpected `%c` in object", line_and_col, b);
|
|
goto e_failed;
|
|
};
|
|
break;
|
|
|
|
case json_integer:
|
|
case json_double:
|
|
if (isdigit((unsigned char)b)) {
|
|
++num_digits;
|
|
|
|
if (top->type == json_integer || flags & flag_num_e) {
|
|
if (!(flags & flag_num_e)) {
|
|
if (flags & flag_num_zero) {
|
|
snprintf(error, json_error_max, "%u:%u: Unexpected `0` before `%c`",
|
|
line_and_col, b);
|
|
goto e_failed;
|
|
}
|
|
|
|
if (num_digits == 1 && b == '0') flags |= flag_num_zero;
|
|
} else {
|
|
flags |= flag_num_e_got_sign;
|
|
num_e = (num_e * 10) + (b - '0');
|
|
continue;
|
|
}
|
|
|
|
if (would_overflow(top->u.integer, b)) {
|
|
json_int_t integer = top->u.integer;
|
|
--num_digits;
|
|
--state.ptr;
|
|
top->type = json_double;
|
|
top->u.dbl = (double)integer;
|
|
continue;
|
|
}
|
|
|
|
top->u.integer = (top->u.integer * 10) + (b - '0');
|
|
continue;
|
|
}
|
|
|
|
if (flags & flag_num_got_decimal)
|
|
num_fraction = (num_fraction * 10) + (b - '0');
|
|
else
|
|
top->u.dbl = (top->u.dbl * 10) + (b - '0');
|
|
|
|
continue;
|
|
}
|
|
|
|
if (b == '+' || b == '-') {
|
|
if ((flags & flag_num_e) && !(flags & flag_num_e_got_sign)) {
|
|
flags |= flag_num_e_got_sign;
|
|
|
|
if (b == '-') flags |= flag_num_e_negative;
|
|
|
|
continue;
|
|
}
|
|
} else if (b == '.' && top->type == json_integer) {
|
|
json_int_t integer = top->u.integer;
|
|
|
|
if (!num_digits) {
|
|
snprintf(error, json_error_max, "%u:%u: Expected digit before `.`", line_and_col);
|
|
goto e_failed;
|
|
}
|
|
|
|
top->type = json_double;
|
|
top->u.dbl = (double)integer;
|
|
|
|
flags |= flag_num_got_decimal;
|
|
num_digits = 0;
|
|
continue;
|
|
}
|
|
|
|
if (!(flags & flag_num_e)) {
|
|
if (top->type == json_double) {
|
|
if (!num_digits) {
|
|
snprintf(error, json_error_max, "%u:%u: Expected digit after `.`", line_and_col);
|
|
goto e_failed;
|
|
}
|
|
|
|
top->u.dbl += num_fraction / pow(10.0, num_digits);
|
|
}
|
|
|
|
if (b == 'e' || b == 'E') {
|
|
flags |= flag_num_e;
|
|
|
|
if (top->type == json_integer) {
|
|
json_int_t integer = top->u.integer;
|
|
top->type = json_double;
|
|
top->u.dbl = (double)integer;
|
|
}
|
|
|
|
num_digits = 0;
|
|
flags &= ~flag_num_zero;
|
|
|
|
continue;
|
|
}
|
|
} else {
|
|
if (!num_digits) {
|
|
snprintf(error, json_error_max, "%u:%u: Expected digit after `e`", line_and_col);
|
|
goto e_failed;
|
|
}
|
|
|
|
top->u.dbl *= pow(10.0, (flags & flag_num_e_negative ? -num_e : num_e));
|
|
}
|
|
|
|
if (flags & flag_num_negative) {
|
|
if (top->type == json_integer)
|
|
top->u.integer = -top->u.integer;
|
|
else
|
|
top->u.dbl = -top->u.dbl;
|
|
}
|
|
|
|
flags |= flag_next | flag_reproc;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
};
|
|
}
|
|
|
|
if (flags & flag_reproc) {
|
|
flags &= ~flag_reproc;
|
|
--state.ptr;
|
|
}
|
|
|
|
if (flags & flag_next) {
|
|
flags = (flags & ~flag_next) | flag_need_comma;
|
|
|
|
if (!top->parent) {
|
|
/* root value done */
|
|
|
|
flags |= flag_done;
|
|
continue;
|
|
}
|
|
|
|
if (top->parent->type == json_array) flags |= flag_seek_value;
|
|
|
|
if (!state.first_pass) {
|
|
json_value *parent = top->parent;
|
|
|
|
switch (parent->type) {
|
|
case json_object:
|
|
parent->u.object.values[parent->u.object.length].value = top;
|
|
break;
|
|
case json_array:
|
|
parent->u.array.values[parent->u.array.length] = top;
|
|
break;
|
|
default:
|
|
break;
|
|
};
|
|
}
|
|
|
|
if ((++top->parent->u.array.length) > UINT_MAX - 8) goto e_overflow;
|
|
top = top->parent;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
alloc = root;
|
|
}
|
|
|
|
return root;
|
|
|
|
e_unknown_value:
|
|
snprintf(error, json_error_max, "%u:%u: Unknown value", line_and_col);
|
|
goto e_failed;
|
|
|
|
e_alloc_failure:
|
|
snprintf(error, json_error_max, "Memory allocation failure");
|
|
goto e_failed;
|
|
|
|
e_overflow:
|
|
snprintf(error, json_error_max, "%u:%u: Too long (caught overflow)", line_and_col);
|
|
goto e_failed;
|
|
|
|
e_failed:
|
|
if (error_buf) {
|
|
if (*error)
|
|
memcpy(error_buf, error, json_error_max);
|
|
else
|
|
snprintf(error_buf, json_error_max, "Unknown error");
|
|
}
|
|
|
|
if (state.first_pass) alloc = root;
|
|
|
|
while (alloc) {
|
|
top = alloc->_reserved.next_alloc;
|
|
free(alloc);
|
|
alloc = top;
|
|
}
|
|
|
|
if (!state.first_pass) json_value_free(root);
|
|
|
|
return 0;
|
|
}
|
|
|
|
json_value *json_parse(const json_char *json, size_t length) {
|
|
json_settings settings = {0};
|
|
return json_parse_ex(&settings, json, length, 0);
|
|
}
|
|
|
|
void json_value_free(json_value *value) {
|
|
json_value *cur_value;
|
|
|
|
if (!value) return;
|
|
|
|
value->parent = 0;
|
|
|
|
while (value) {
|
|
switch (value->type) {
|
|
case json_array:
|
|
|
|
if (!value->u.array.length) {
|
|
free(value->u.array.values);
|
|
break;
|
|
}
|
|
|
|
value = value->u.array.values[--value->u.array.length];
|
|
continue;
|
|
|
|
case json_object:
|
|
|
|
if (!value->u.object.length) {
|
|
free(value->u.object.values);
|
|
break;
|
|
}
|
|
|
|
value = value->u.object.values[--value->u.object.length].value;
|
|
continue;
|
|
|
|
case json_string:
|
|
|
|
free(value->u.string.ptr);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
};
|
|
|
|
cur_value = value;
|
|
value = value->parent;
|
|
free(cur_value);
|
|
}
|
|
}
|