/************************************************************************* * (C) 2017 AITNET ltd - Sofia/Bulgaria - * by Michael Pounov * * $Author: misho $ * $Id: json.c,v 1.1.2.2 2017/11/24 15:52:57 misho Exp $ * ************************************************************************** The ELWIX and AITNET software is distributed under the following terms: All of the documentation and software included in the ELWIX and AITNET Releases is copyrighted by ELWIX - Sofia/Bulgaria Copyright 2004 - 2017 by Michael Pounov . All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. All advertising materials mentioning features or use of this software must display the following acknowledgement: This product includes software developed by Michael Pounov ELWIX - Embedded LightWeight unIX and its contributors. 4. Neither the name of AITNET nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "global.h" /* JSON error strings */ const char *jerrstr[] = { "No error", "Not enough tokens were provided", "Invalid character", "JSON string isn't full", "Invalid parameter", NULL }; /* * json_init() - Initialize JSON handler * * @json = JSON handler, if there is NULL then dynamically will be allocated * @jstrict = JSON strict mode, when we select strict mode every unquoted value is error * return: =NULL error or !=NULL ready for use JSON handler and should be free with json_free() */ json_t * json_init(json_t * __restrict json, int jstrict) { json_t *j = json; if (!j) { j = e_malloc(sizeof(json_t)); if (!j) { LOGERR; return NULL; } } memset(j, 0, sizeof(json_t)); j->h_parent = -1; j->h_strict = jstrict; /* handler is dynamically allocated! */ if (!json) j->h_alloc = j; return j; } /* * json_free() - Free JSON handler * * @json = JSON handler * return: none */ void json_free(json_t * __restrict json) { if (json) { if (json->h_alloc) e_free(json); else memset(json, 0, sizeof(json_t)); } } /* * json_parse() - Parse JSON string * * @json = JSON handler * @jstr = JSON string * @jlen = JSON string length * @jtoks = Token array * @toksnum = Token array size, return number of allocated tokens in array * return: -1 error or number of found tokens */ u_int json_parse(json_t * __restrict json, const char *jstr, size_t jlen, jtok_t * __restrict jtoks, u_int toksnum) { register int i; register u_int cx; jtype_t type; jtok_t *tok; char ch; if (!json || !jstr || (!jtoks && toksnum)) { elwix_SetErr(J_ERR_PARAM, "%s", jerrstr[J_ERR_PARAM]); return (u_int) -1; } for (cx = json->h_next; json->h_pos < jlen && jstr[json->h_pos]; json->h_pos++) { switch ((ch = jstr[json->h_pos])) { case '{': case '[': cx++; /* start new token */ if (!jtoks) break; tok = json_gettoken(json, jtoks, toksnum); if (!tok) { elwix_SetErr(J_ERR_NOMEM, "%s", jerrstr[J_ERR_NOMEM]); return (u_int) -1; } if (json->h_parent != -1) { jtoks[json->h_parent].tok_size++; tok->tok_parent = json->h_parent; } tok->tok_type = (ch == '{' ? J_OBJECT : J_ARRAY); tok->tok_start = json->h_pos; json->h_parent = json->h_next - 1; break; case '}': case ']': if (!jtoks) break; if (json->h_next < 1) { elwix_SetErr(J_ERR_INVAL, "%s", jerrstr[J_ERR_INVAL]); return (u_int) -1; } type = (ch == '}' ? J_OBJECT : J_ARRAY); tok = &jtoks[json->h_next - 1]; while (42) { if (tok->tok_start != -1 && tok->tok_end == -1) { if (tok->tok_type != type) { elwix_SetErr(J_ERR_INVAL, "%s", jerrstr[J_ERR_INVAL]); return (u_int) -1; } tok->tok_end = json->h_pos + 1; json->h_parent = tok->tok_parent; break; } if (tok->tok_parent == -1) { if (tok->tok_type != type || json->h_parent == -1) { elwix_SetErr(J_ERR_INVAL, "%s", jerrstr[J_ERR_INVAL]); return (u_int) -1; } break; } tok = &jtoks[tok->tok_parent]; } break; case '\"': if (json_parse_string(json, jstr, jlen, jtoks, toksnum) == -1) { elwix_SetErr(J_ERR_INVAL, "%s", jerrstr[J_ERR_INVAL]); return (u_int) -1; } cx++; if (jtoks && json->h_parent != -1) jtoks[json->h_parent].tok_size++; break; case '\t': case '\r': case '\n': case ' ': /* whitespace, skip */ break; case ':': json->h_parent = json->h_next - 1; break; case ',': if (jtoks && json->h_parent != -1 && jtoks[json->h_parent].tok_type != J_OBJECT && jtoks[json->h_parent].tok_type != J_ARRAY) json->h_parent = jtoks[json->h_parent].tok_parent; break; case '-': case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': case 't': case 'f': case 'n': if (!json->h_strict) break; if (jtoks && json->h_parent != -1) { /* they must not be keys of the object */ if (jtoks[json->h_parent].tok_type == J_OBJECT || (jtoks[json->h_parent].tok_type == J_STRING && jtoks[json->h_parent].tok_size)) { elwix_SetErr(J_ERR_INVAL, "%s", jerrstr[J_ERR_INVAL]); return (u_int) -1; } } if (json_parse_value(json, jstr, jlen, jtoks, toksnum) == -1) return (u_int) -1; cx++; if (jtoks && json->h_parent != -1) jtoks[json->h_parent].tok_size++; break; default: if (json->h_strict) { elwix_SetErr(J_ERR_INVAL, "%s", jerrstr[J_ERR_INVAL]); return (u_int) -1; } if (json_parse_value(json, jstr, jlen, jtoks, toksnum) == -1) return (u_int) -1; cx++; if (jtoks && json->h_parent != -1) jtoks[json->h_parent].tok_size++; break; } } if (jtoks) { for (i = json->h_next - 1; i >= 0; i--) { /* unmatched opened object or array */ if (jtoks[i].tok_start != -1 && jtoks[i].tok_end == -1) { elwix_SetErr(J_ERR_PART, "%s", jerrstr[J_ERR_PART]); return (u_int) -1; } } } return cx; }