| 1 | /** @file
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| 2 | * IPRT - JavaScript Object Notation (JSON) Parser.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2016-2024 Oracle and/or its affiliates.
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| 7 | *
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| 8 | * This file is part of VirtualBox base platform packages, as
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| 9 | * available from https://www.215389.xyz.
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| 10 | *
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| 11 | * This program is free software; you can redistribute it and/or
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| 12 | * modify it under the terms of the GNU General Public License
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| 13 | * as published by the Free Software Foundation, in version 3 of the
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| 14 | * License.
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| 15 | *
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| 16 | * This program is distributed in the hope that it will be useful, but
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | * General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 23 | *
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| 24 | * The contents of this file may alternatively be used under the terms
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| 25 | * of the Common Development and Distribution License Version 1.0
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| 26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 27 | * in the VirtualBox distribution, in which case the provisions of the
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| 28 | * CDDL are applicable instead of those of the GPL.
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| 29 | *
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| 30 | * You may elect to license modified versions of this file under the
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| 31 | * terms and conditions of either the GPL or the CDDL or both.
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| 32 | *
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| 33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 34 | */
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| 35 |
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| 36 | #ifndef IPRT_INCLUDED_json_h
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| 37 | #define IPRT_INCLUDED_json_h
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| 38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 39 | # pragma once
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| 40 | #endif
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| 41 |
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| 42 | #include <iprt/types.h>
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| 43 |
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| 44 | RT_C_DECLS_BEGIN
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| 45 |
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| 46 |
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| 47 | /** @defgroup grp_json RTJson - JavaScript Object Notation (JSON) Parser
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| 48 | * @ingroup grp_rt
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| 49 | * @{
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| 50 | */
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| 51 |
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| 52 | /**
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| 53 | * JSON value types.
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| 54 | */
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| 55 | typedef enum RTJSONVALTYPE
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| 56 | {
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| 57 | /** Invalid first value. */
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| 58 | RTJSONVALTYPE_INVALID = 0,
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| 59 | /** Value containing an object. */
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| 60 | RTJSONVALTYPE_OBJECT,
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| 61 | /** Value containing an array. */
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| 62 | RTJSONVALTYPE_ARRAY,
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| 63 | /** Value containing a string. */
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| 64 | RTJSONVALTYPE_STRING,
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| 65 | /** Value containg an integer number. */
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| 66 | RTJSONVALTYPE_INTEGER,
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| 67 | /** Value containg an floating point number. */
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| 68 | RTJSONVALTYPE_NUMBER,
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| 69 | /** Value containg the special null value. */
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| 70 | RTJSONVALTYPE_NULL,
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| 71 | /** Value containing true. */
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| 72 | RTJSONVALTYPE_TRUE,
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| 73 | /** Value containing false. */
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| 74 | RTJSONVALTYPE_FALSE,
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| 75 | /** 32-bit hack. */
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| 76 | RTJSONVALTYPE_32BIT_HACK = 0x7fffffff
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| 77 | } RTJSONVALTYPE;
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| 78 | /** Pointer to a JSON value type. */
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| 79 | typedef RTJSONVALTYPE *PRTJSONVALTYPE;
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| 80 |
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| 81 | /** JSON value handle. */
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| 82 | typedef struct RTJSONVALINT *RTJSONVAL;
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| 83 | /** Pointer to a JSON value handle. */
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| 84 | typedef RTJSONVAL *PRTJSONVAL;
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| 85 | /** NIL JSON value handle. */
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| 86 | #define NIL_RTJSONVAL ((RTJSONVAL)~(uintptr_t)0)
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| 87 |
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| 88 | /** JSON iterator handle. */
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| 89 | typedef struct RTJSONITINT *RTJSONIT;
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| 90 | /** Pointer to a JSON iterator handle. */
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| 91 | typedef RTJSONIT *PRTJSONIT;
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| 92 | /** NIL JSON iterator handle. */
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| 93 | #define NIL_RTJSONIT ((RTJSONIT)~(uintptr_t)0)
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| 94 |
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| 95 | /** Allow JSON5 extensions. */
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| 96 | #define RTJSON_PARSE_F_JSON5 RT_BIT_32(0)
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| 97 | /** Mask of valid flags. */
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| 98 | #define RTJSON_PARSE_F_VALID RTJSON_PARSE_F_JSON5
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| 99 |
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| 100 |
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| 101 |
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| 102 | /**
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| 103 | * Parses a JSON document in the provided buffer returning the root JSON value.
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| 104 | *
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| 105 | * @returns IPRT status code.
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| 106 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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| 107 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 108 | * @param fFlags Combination of RTJSON_PARSE_F_XXX.
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| 109 | * @param pbBuf The byte buffer containing the JSON document.
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| 110 | * @param cbBuf Size of the buffer.
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| 111 | * @param pErrInfo Where to store extended error info. Optional.
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| 112 | *
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| 113 | * @todo r=bird: The use of uint8_t makes no sense here since the parser
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| 114 | * expects ASCII / UTF-8. What's more, if this is a real buffer the
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| 115 | * type should be 'const void *' rather than 'const uint8_t *'.
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| 116 | * This function should be modified to reflect that it's really for
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| 117 | * handling unterminated strings.
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| 118 | */
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| 119 | RTDECL(int) RTJsonParseFromBuf(PRTJSONVAL phJsonVal, uint32_t fFlags, const uint8_t *pbBuf, size_t cbBuf, PRTERRINFO pErrInfo);
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| 120 |
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| 121 | /**
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| 122 | * Parses a JSON document from the provided string returning the root JSON value.
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| 123 | *
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| 124 | * @returns IPRT status code.
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| 125 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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| 126 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 127 | * @param fFlags Combination of RTJSON_PARSE_F_XXX.
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| 128 | * @param pszStr The string containing the JSON document.
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| 129 | * @param pErrInfo Where to store extended error info. Optional.
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| 130 | */
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| 131 | RTDECL(int) RTJsonParseFromString(PRTJSONVAL phJsonVal, uint32_t fFlags, const char *pszStr, PRTERRINFO pErrInfo);
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| 132 |
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| 133 | /**
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| 134 | * Parses a JSON document from the file pointed to by the given filename
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| 135 | * returning the root JSON value.
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| 136 | *
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| 137 | * @returns IPRT status code.
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| 138 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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| 139 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 140 | * @param fFlags Combination of RTJSON_PARSE_F_XXX.
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| 141 | * @param pszFilename The name of the file containing the JSON document.
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| 142 | * @param pErrInfo Where to store extended error info. Optional.
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| 143 | */
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| 144 | RTDECL(int) RTJsonParseFromFile(PRTJSONVAL phJsonVal, uint32_t fFlags, const char *pszFilename, PRTERRINFO pErrInfo);
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| 145 |
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| 146 | /**
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| 147 | * Parses a JSON document from the given VFS file
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| 148 | * returning the root JSON value.
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| 149 | *
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| 150 | * @returns IPRT status code.
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| 151 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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| 152 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 153 | * @param fFlags Combination of RTJSON_PARSE_F_XXX.
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| 154 | * @param hVfsFile The VFS file to parse.
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| 155 | * @param pErrInfo Where to store extended error info. Optional.
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| 156 | */
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| 157 | RTDECL(int) RTJsonParseFromVfsFile(PRTJSONVAL phJsonVal, uint32_t fFlags, RTVFSFILE hVfsFile, PRTERRINFO pErrInfo);
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| 158 |
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| 159 | /**
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| 160 | * Retain a given JSON value.
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| 161 | *
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| 162 | * @returns New reference count.
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| 163 | * @param hJsonVal The JSON value handle.
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| 164 | */
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| 165 | RTDECL(uint32_t) RTJsonValueRetain(RTJSONVAL hJsonVal);
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| 166 |
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| 167 | /**
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| 168 | * Release a given JSON value.
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| 169 | *
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| 170 | * @returns New reference count, if this drops to 0 the value is freed.
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| 171 | * @param hJsonVal The JSON value handle.
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| 172 | */
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| 173 | RTDECL(uint32_t) RTJsonValueRelease(RTJSONVAL hJsonVal);
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| 174 |
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| 175 | /**
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| 176 | * Return the type of a given JSON value.
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| 177 | *
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| 178 | * @returns Type of the given JSON value.
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| 179 | * @param hJsonVal The JSON value handle.
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| 180 | */
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| 181 | RTDECL(RTJSONVALTYPE) RTJsonValueGetType(RTJSONVAL hJsonVal);
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| 182 |
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| 183 | /**
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| 184 | * Translates value type to a name.
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| 185 | *
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| 186 | * @returns Readonly name string
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| 187 | * @param enmType The JSON value type to name.
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| 188 | */
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| 189 | RTDECL(const char *) RTJsonValueTypeName(RTJSONVALTYPE enmType);
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| 190 |
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| 191 | /**
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| 192 | * Returns the string from a given JSON string value.
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| 193 | *
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| 194 | * @returns Pointer to the string of the JSON value, NULL if the value type
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| 195 | * doesn't indicate a string.
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| 196 | * @param hJsonVal The JSON value handle.
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| 197 | */
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| 198 | RTDECL(const char *) RTJsonValueGetString(RTJSONVAL hJsonVal);
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| 199 |
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| 200 | /**
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| 201 | * Returns the string from a given JSON string value, extended.
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| 202 | *
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| 203 | * @returns IPRT status code.
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| 204 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not a string.
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| 205 | * @param hJsonVal The JSON value handle.
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| 206 | * @param ppszStr Where to store the pointer to the string on success.
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| 207 | */
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| 208 | RTDECL(int) RTJsonValueQueryString(RTJSONVAL hJsonVal, const char **ppszStr);
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| 209 |
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| 210 | /**
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| 211 | * Returns the integer from a given JSON integer value.
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| 212 | *
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| 213 | * @returns IPRT status code.
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| 214 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not a number.
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| 215 | * @param hJsonVal The JSON value handle.
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| 216 | * @param pi64Num WHere to store the number on success.
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| 217 | * @sa RTJsonValueQueryNumber
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| 218 | */
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| 219 | RTDECL(int) RTJsonValueQueryInteger(RTJSONVAL hJsonVal, int64_t *pi64Num);
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| 220 |
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| 221 | /**
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| 222 | * Returns the floating point value from a given JSON number value.
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| 223 | *
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| 224 | * @returns IPRT status code.
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| 225 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not a number.
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| 226 | * @param hJsonVal The JSON value handle.
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| 227 | * @param prdNum WHere to store the floating point number on success.
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| 228 | * @sa RTJsonValueQueryInteger
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| 229 | */
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| 230 | RTDECL(int) RTJsonValueQueryNumber(RTJSONVAL hJsonVal, double *prdNum);
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| 231 |
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| 232 | /**
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| 233 | * Returns the value associated with a given name for the given JSON object value.
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| 234 | *
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| 235 | * @returns IPRT status code.
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| 236 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object.
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| 237 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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| 238 | * @param hJsonVal The JSON value handle.
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| 239 | * @param pszName The member name of the object.
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| 240 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 241 | */
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| 242 | RTDECL(int) RTJsonValueQueryByName(RTJSONVAL hJsonVal, const char *pszName, PRTJSONVAL phJsonVal);
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| 243 |
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| 244 | /**
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| 245 | * Returns the number of a number value associated with a given name for the given JSON object value.
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| 246 | *
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| 247 | * @returns IPRT status code.
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| 248 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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| 249 | * the name does not point to an integer value.
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| 250 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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| 251 | * @param hJsonVal The JSON value handle.
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| 252 | * @param pszName The member name of the object.
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| 253 | * @param pi64Num Where to store the number on success.
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| 254 | */
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| 255 | RTDECL(int) RTJsonValueQueryIntegerByName(RTJSONVAL hJsonVal, const char *pszName, int64_t *pi64Num);
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| 256 |
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| 257 | /**
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| 258 | * Returns the number of a number value associated with a given name for the given JSON object value.
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| 259 | *
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| 260 | * @returns IPRT status code.
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| 261 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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| 262 | * the name does not point to a number value.
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| 263 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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| 264 | * @param hJsonVal The JSON value handle.
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| 265 | * @param pszName The member name of the object.
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| 266 | * @param prdNum WHere to store the floating point number on success.
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| 267 | */
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| 268 | RTDECL(int) RTJsonValueQueryNumberByName(RTJSONVAL hJsonVal, const char *pszName, double *prdNum);
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| 269 |
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| 270 | /**
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| 271 | * Returns the string of a string value associated with a given name for the given JSON object value.
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| 272 | *
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| 273 | * @returns IPRT status code.
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| 274 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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| 275 | * the name does not point to a string value.
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| 276 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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| 277 | * @param hJsonVal The JSON value handle.
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| 278 | * @param pszName The member name of the object.
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| 279 | * @param ppszStr Where to store the pointer to the string on success.
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| 280 | * Must be freed with RTStrFree().
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| 281 | */
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| 282 | RTDECL(int) RTJsonValueQueryStringByName(RTJSONVAL hJsonVal, const char *pszName, char **ppszStr);
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| 283 |
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| 284 | /**
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| 285 | * Returns the boolean of a true/false value associated with a given name for the given JSON object value.
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| 286 | *
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| 287 | * @returns IPRT status code.
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| 288 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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| 289 | * the name does not point to a true/false value.
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| 290 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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| 291 | * @param hJsonVal The JSON value handle.
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| 292 | * @param pszName The member name of the object.
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| 293 | * @param pfBoolean Where to store the boolean value on success.
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| 294 | */
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| 295 | RTDECL(int) RTJsonValueQueryBooleanByName(RTJSONVAL hJsonVal, const char *pszName, bool *pfBoolean);
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| 296 |
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| 297 | /**
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| 298 | * Returns the size of a given JSON array value.
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| 299 | *
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| 300 | * @returns Size of the JSON array value.
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| 301 | * @retval 0 if the array is empty or the JSON value is not an array.
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| 302 | * @param hJsonVal The JSON value handle.
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| 303 | */
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| 304 | RTDECL(unsigned) RTJsonValueGetArraySize(RTJSONVAL hJsonVal);
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| 305 |
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| 306 | /**
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| 307 | * Returns the size of a given JSON array value - extended version.
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| 308 | *
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| 309 | * @returns IPRT status code.
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| 310 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array.
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| 311 | * @param hJsonVal The JSON value handle.
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| 312 | * @param pcItems Where to store the size of the JSON array value on success.
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| 313 | */
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| 314 | RTDECL(int) RTJsonValueQueryArraySize(RTJSONVAL hJsonVal, unsigned *pcItems);
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| 315 |
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| 316 | /**
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| 317 | * Returns the value for the given index of a given JSON array value.
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| 318 | *
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| 319 | * @returns IPRT status code.
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| 320 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array.
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| 321 | * @retval VERR_OUT_OF_RANGE if @a idx is out of bounds.
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| 322 | *
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| 323 | * @param hJsonVal The JSON value handle.
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| 324 | * @param idx The index to get the value from.
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| 325 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 326 | */
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| 327 | RTDECL(int) RTJsonValueQueryByIndex(RTJSONVAL hJsonVal, unsigned idx, PRTJSONVAL phJsonVal);
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| 328 |
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| 329 | /**
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| 330 | * Creates an iterator for a given JSON array or object value.
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| 331 | *
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| 332 | * @returns IPRT status code.
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| 333 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array or
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| 334 | * object.
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| 335 | * @param hJsonVal The JSON value handle.
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| 336 | * @param phJsonIt Where to store the JSON iterator handle on success.
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| 337 | * @todo Make return VERR_JSON_IS_EMPTY (or remove it).
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| 338 | */
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| 339 | RTDECL(int) RTJsonIteratorBegin(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt);
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| 340 |
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| 341 | /**
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| 342 | * Creates an iterator for a given JSON array value.
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| 343 | *
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| 344 | * @returns IPRT status code.
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| 345 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array.
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| 346 | * @retval VERR_JSON_IS_EMPTY if no members.
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| 347 | * @param hJsonVal The JSON value handle.
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| 348 | * @param phJsonIt Where to store the JSON iterator handle on success.
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| 349 | */
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| 350 | RTDECL(int) RTJsonIteratorBeginArray(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt);
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| 351 |
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| 352 | /**
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| 353 | * Creates an iterator for a given JSON object value.
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| 354 | *
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| 355 | * @returns IPRT status code.
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| 356 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object.
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| 357 | * @retval VERR_JSON_IS_EMPTY if no members.
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| 358 | * @param hJsonVal The JSON value handle.
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| 359 | * @param phJsonIt Where to store the JSON iterator handle on success.
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| 360 | */
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| 361 | RTDECL(int) RTJsonIteratorBeginObject(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt);
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| 362 |
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| 363 | /**
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| 364 | * Gets the value and optional name for the current iterator position.
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| 365 | *
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| 366 | * @returns IPRT status code.
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| 367 | * @param hJsonIt The JSON iterator handle.
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| 368 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 369 | * @param ppszName Where to store the object member name for an object.
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| 370 | * NULL is returned for arrays.
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| 371 | */
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| 372 | RTDECL(int) RTJsonIteratorQueryValue(RTJSONIT hJsonIt, PRTJSONVAL phJsonVal, const char **ppszName);
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| 373 |
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| 374 | /**
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| 375 | * Advances to the next element in the referenced JSON value.
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| 376 | *
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| 377 | * @returns IPRT status code.
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| 378 | * @retval VERR_JSON_ITERATOR_END if the end for this iterator was reached.
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| 379 | * @param hJsonIt The JSON iterator handle.
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| 380 | */
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| 381 | RTDECL(int) RTJsonIteratorNext(RTJSONIT hJsonIt);
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| 382 |
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| 383 | /**
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| 384 | * Frees a given JSON iterator.
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| 385 | *
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| 386 | * @param hJsonIt The JSON iterator to free.
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| 387 | */
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| 388 | RTDECL(void) RTJsonIteratorFree(RTJSONIT hJsonIt);
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| 389 |
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| 390 | RT_C_DECLS_END
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| 391 |
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| 392 | /** @} */
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| 393 |
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| 394 | #endif /* !IPRT_INCLUDED_json_h */
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| 395 |
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