Diff: AWS_openssl/aws_iot_src/utils/jsmn.cpp

Revision:

15:6f2798e45099

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AWS_openssl/aws_iot_src/utils/jsmn.cpp	Thu Dec 01 18:05:38 2016 +0000
@@ -0,0 +1,343 @@
+/*
+ * Copyright (c) 2010 Serge A. Zaitsev
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * @file jsmn.c
+ * @brief Implementation of the JSMN (Jasmine) JSON parser.
+ *
+ * For more information on JSMN:
+ * @see http://zserge.com/jsmn.html
+ */
+
+#include <stdlib.h>
+
+#include "jsmn.h"
+
+/**
+ * Allocates a fresh unused token from the token pull.
+ */
+static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser, jsmntok_t *tokens,
+        size_t num_tokens) {
+    jsmntok_t *tok;
+    if (parser->toknext >= num_tokens) {
+        return NULL;
+    }
+    tok = &tokens[parser->toknext++];
+    tok->start = tok->end = -1;
+    tok->size = 0;
+#ifdef JSMN_PARENT_LINKS
+    tok->parent = -1;
+#endif
+    return tok;
+}
+
+/**
+ * Fills token type and boundaries.
+ */
+static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type, int start,
+        int end) {
+    token->type = type;
+    token->start = start;
+    token->end = end;
+    token->size = 0;
+}
+
+/**
+ * Fills next available token with JSON primitive.
+ */
+static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js,
+        size_t len, jsmntok_t *tokens, size_t num_tokens) {
+    jsmntok_t *token;
+    int start;
+
+    start = parser->pos;
+
+    for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
+        switch (js[parser->pos]) {
+#ifndef JSMN_STRICT
+        /* In strict mode primitive must be followed by "," or "}" or "]" */
+        case ':':
+#endif
+        case '\t':
+        case '\r':
+        case '\n':
+        case ' ':
+        case ',':
+        case ']':
+        case '}':
+            goto found;
+        }
+        if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
+            parser->pos = start;
+            return JSMN_ERROR_INVAL;
+        }
+    }
+#ifdef JSMN_STRICT
+    /* In strict mode primitive must be followed by a comma/object/array */
+    parser->pos = start;
+    return JSMN_ERROR_PART;
+#endif
+
+    found: if (tokens == NULL) {
+        parser->pos--;
+        return (jsmnerr_t) 0;
+    }
+    token = jsmn_alloc_token(parser, tokens, num_tokens);
+    if (token == NULL) {
+        parser->pos = start;
+        return JSMN_ERROR_NOMEM;
+    }
+    jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
+#ifdef JSMN_PARENT_LINKS
+    token->parent = parser->toksuper;
+#endif
+    parser->pos--;
+    return (jsmnerr_t) 0;
+}
+
+/**
+ * Filsl next token with JSON string.
+ */
+static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
+        size_t len, jsmntok_t *tokens, size_t num_tokens) {
+    jsmntok_t *token;
+
+    int start = parser->pos;
+
+    parser->pos++;
+
+    /* Skip starting quote */
+    for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
+        char c = js[parser->pos];
+
+        /* Quote: end of string */
+        if (c == '\"') {
+            if (tokens == NULL) {
+                return (jsmnerr_t) 0;
+            }
+            token = jsmn_alloc_token(parser, tokens, num_tokens);
+            if (token == NULL) {
+                parser->pos = start;
+                return JSMN_ERROR_NOMEM;
+            }
+            jsmn_fill_token(token, JSMN_STRING, start + 1, parser->pos);
+#ifdef JSMN_PARENT_LINKS
+            token->parent = parser->toksuper;
+#endif
+            return (jsmnerr_t) 0;
+        }
+
+        /* Backslash: Quoted symbol expected */
+        if (c == '\\') {
+            parser->pos++;
+            switch (js[parser->pos]) {
+            /* Allowed escaped symbols */
+            case '\"':
+            case '/':
+            case '\\':
+            case 'b':
+            case 'f':
+            case 'r':
+            case 'n':
+            case 't':
+                break;
+                /* Allows escaped symbol \uXXXX */
+            case 'u':
+                parser->pos++;
+                int i;
+                for (i = 0; i < 4 && js[parser->pos] != '\0'; i++) {
+                    /* If it isn't a hex character we have an error */
+                    if (!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */
+                    (js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */
+                    (js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */
+                        parser->pos = start;
+                        return JSMN_ERROR_INVAL;
+                    }
+                    parser->pos++;
+                }
+                parser->pos--;
+                break;
+                /* Unexpected symbol */
+            default:
+                parser->pos = start;
+                return JSMN_ERROR_INVAL;
+            }
+        }
+    }
+    parser->pos = start;
+    return JSMN_ERROR_PART;
+}
+
+/**
+ * Parse JSON string and fill tokens.
+ */
+jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
+        jsmntok_t *tokens, unsigned int num_tokens) {
+    jsmnerr_t r;
+    int i;
+    jsmntok_t *token;
+    int count = 0;
+
+    for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
+        char c;
+        jsmntype_t type;
+
+        c = js[parser->pos];
+        switch (c) {
+        case '{':
+        case '[':
+            count++;
+            if (tokens == NULL) {
+                break;
+            }
+            token = jsmn_alloc_token(parser, tokens, num_tokens);
+            if (token == NULL)
+                return JSMN_ERROR_NOMEM;
+            if (parser->toksuper != -1) {
+                tokens[parser->toksuper].size++;
+#ifdef JSMN_PARENT_LINKS
+                token->parent = parser->toksuper;
+#endif
+            }
+            token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
+            token->start = parser->pos;
+            parser->toksuper = parser->toknext - 1;
+            break;
+        case '}':
+        case ']':
+            if (tokens == NULL)
+                break;
+            type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
+#ifdef JSMN_PARENT_LINKS
+            if (parser->toknext < 1) {
+                return JSMN_ERROR_INVAL;
+            }
+            token = &tokens[parser->toknext - 1];
+            for (;;) {
+                if (token->start != -1 && token->end == -1) {
+                    if (token->type != type) {
+                        return JSMN_ERROR_INVAL;
+                    }
+                    token->end = parser->pos + 1;
+                    parser->toksuper = token->parent;
+                    break;
+                }
+                if (token->parent == -1) {
+                    break;
+                }
+                token = &tokens[token->parent];
+            }
+#else
+            for (i = parser->toknext - 1; i >= 0; i--) {
+                token = &tokens[i];
+                if (token->start != -1 && token->end == -1) {
+                    if (token->type != type) {
+                        return JSMN_ERROR_INVAL;
+                    }
+                    parser->toksuper = -1;
+                    token->end = parser->pos + 1;
+                    break;
+                }
+            }
+            /* Error if unmatched closing bracket */
+            if (i == -1)
+                return JSMN_ERROR_INVAL;
+            for (; i >= 0; i--) {
+                token = &tokens[i];
+                if (token->start != -1 && token->end == -1) {
+                    parser->toksuper = i;
+                    break;
+                }
+            }
+#endif
+            break;
+        case '\"':
+            r = jsmn_parse_string(parser, js, len, tokens, num_tokens);
+            if (r < 0)
+                return r;
+            count++;
+            if (parser->toksuper != -1 && tokens != NULL)
+                tokens[parser->toksuper].size++;
+            break;
+        case '\t':
+        case '\r':
+        case '\n':
+        case ':':
+        case ',':
+        case ' ':
+            break;
+#ifdef JSMN_STRICT
+            /* In strict mode primitives are: numbers and booleans */
+        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':
+#else
+            /* In non-strict mode every unquoted value is a primitive */
+            default:
+#endif
+            r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens);
+            if (r < 0)
+                return r;
+            count++;
+            if (parser->toksuper != -1 && tokens != NULL)
+                tokens[parser->toksuper].size++;
+            break;
+
+#ifdef JSMN_STRICT
+            /* Unexpected char in strict mode */
+        default:
+            return JSMN_ERROR_INVAL;
+#endif
+        }
+    }
+
+    for (i = parser->toknext - 1; i >= 0; i--) {
+        /* Unmatched opened object or array */
+        if (tokens[i].start != -1 && tokens[i].end == -1) {
+            return JSMN_ERROR_PART;
+        }
+    }
+
+    return (jsmnerr_t) count;
+}
+
+/**
+ * Creates a new parser based over a given  buffer with an array of tokens 
+ * available.
+ */
+void jsmn_init(jsmn_parser *parser) {
+    parser->pos = 0;
+    parser->toknext = 0;
+    parser->toksuper = -1;
+}
+