| 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) 2016-2017 Oracle Corporation
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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| 24 | */
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| 25 |
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| 26 | #ifndef ___iprt_json_h
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| 27 | #define ___iprt_json_h
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| 28 |
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| 29 | #include <iprt/types.h>
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| 30 | #include <iprt/err.h>
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| 31 |
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| 32 | RT_C_DECLS_BEGIN
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| 33 |
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| 34 |
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| 35 | /** @defgroup grp_json RTJson - JavaScript Object Notation (JSON) Parser
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| 36 | * @ingroup grp_rt
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| 37 | * @{
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| 38 | */
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| 39 |
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| 40 | /**
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| 41 | * JSON value types.
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| 42 | */
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| 43 | typedef enum RTJSONVALTYPE
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| 44 | {
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| 45 | /** Invalid first value. */
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| 46 | RTJSONVALTYPE_INVALID = 0,
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| 47 | /** Value containing an object. */
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| 48 | RTJSONVALTYPE_OBJECT,
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| 49 | /** Value containing an array. */
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| 50 | RTJSONVALTYPE_ARRAY,
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| 51 | /** Value containing a string. */
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| 52 | RTJSONVALTYPE_STRING,
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| 53 | /** Value containg a number. */
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| 54 | RTJSONVALTYPE_NUMBER,
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| 55 | /** Value containg the special null value. */
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| 56 | RTJSONVALTYPE_NULL,
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| 57 | /** Value containing true. */
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| 58 | RTJSONVALTYPE_TRUE,
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| 59 | /** Value containing false. */
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| 60 | RTJSONVALTYPE_FALSE,
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| 61 | /** 32-bit hack. */
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| 62 | RTJSONVALTYPE_32BIT_HACK = 0x7fffffff
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| 63 | } RTJSONVALTYPE;
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| 64 | /** Pointer to a JSON value type. */
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| 65 | typedef RTJSONVALTYPE *PRTJSONVALTYPE;
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| 66 |
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| 67 | /** JSON value handle. */
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| 68 | typedef struct RTJSONVALINT *RTJSONVAL;
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| 69 | /** Pointer to a JSON value handle. */
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| 70 | typedef RTJSONVAL *PRTJSONVAL;
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| 71 | /** NIL JSON value handle. */
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| 72 | #define NIL_RTJSONVAL ((RTJSONVAL)~(uintptr_t)0)
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| 73 |
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| 74 | /** JSON iterator handle. */
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| 75 | typedef struct RTJSONITINT *RTJSONIT;
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| 76 | /** Pointer to a JSON iterator handle. */
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| 77 | typedef RTJSONIT *PRTJSONIT;
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| 78 | /** NIL JSON iterator handle. */
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| 79 | #define NIL_RTJSONIT ((RTJSONIT)~(uintptr_t)0)
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| 80 |
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| 81 | /**
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| 82 | * Parses a JSON document in the provided buffer returning the root JSON value.
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| 83 | *
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| 84 | * @returns IPRT status code.
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| 85 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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| 86 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 87 | * @param pbBuf The byte buffer containing the JSON document.
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| 88 | * @param cbBuf Size of the buffer.
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| 89 | * @param pErrInfo Where to store extended error info. Optional.
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| 90 | *
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| 91 | * @todo r=bird: The use of uint8_t makes no sense here since the parser
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| 92 | * expects ASCII / UTF-8. What's more, if this is a real buffer the
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| 93 | * type should be 'const void *' rather than 'const uint8_t *'.
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| 94 | * This function should be modified to reflect that it's really for
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| 95 | * handling unterminated strings.
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| 96 | */
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| 97 | RTDECL(int) RTJsonParseFromBuf(PRTJSONVAL phJsonVal, const uint8_t *pbBuf, size_t cbBuf, PRTERRINFO pErrInfo);
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| 98 |
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| 99 | /**
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| 100 | * Parses a JSON document from the provided string returning the root JSON value.
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| 101 | *
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| 102 | * @returns IPRT status code.
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| 103 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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| 104 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 105 | * @param pszStr The string containing the JSON document.
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| 106 | * @param pErrInfo Where to store extended error info. Optional.
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| 107 | */
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| 108 | RTDECL(int) RTJsonParseFromString(PRTJSONVAL phJsonVal, const char *pszStr, PRTERRINFO pErrInfo);
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| 109 |
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| 110 | /**
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| 111 | * Parses a JSON document from the file pointed to by the given filename
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| 112 | * returning the root JSON value.
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| 113 | *
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| 114 | * @returns IPRT status code.
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| 115 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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| 116 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 117 | * @param pszFilename The name of the file containing the JSON document.
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| 118 | * @param pErrInfo Where to store extended error info. Optional.
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| 119 | */
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| 120 | RTDECL(int) RTJsonParseFromFile(PRTJSONVAL phJsonVal, const char *pszFilename, PRTERRINFO pErrInfo);
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| 121 |
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| 122 | /**
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| 123 | * Retain a given JSON value.
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| 124 | *
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| 125 | * @returns New reference count.
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| 126 | * @param hJsonVal The JSON value handle.
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| 127 | */
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| 128 | RTDECL(uint32_t) RTJsonValueRetain(RTJSONVAL hJsonVal);
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| 129 |
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| 130 | /**
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| 131 | * Release a given JSON value.
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| 132 | *
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| 133 | * @returns New reference count, if this drops to 0 the value is freed.
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| 134 | * @param hJsonVal The JSON value handle.
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| 135 | */
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| 136 | RTDECL(uint32_t) RTJsonValueRelease(RTJSONVAL hJsonVal);
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| 137 |
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| 138 | /**
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| 139 | * Return the type of a given JSON value.
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| 140 | *
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| 141 | * @returns Type of the given JSON value.
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| 142 | * @param hJsonVal The JSON value handle.
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| 143 | */
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| 144 | RTDECL(RTJSONVALTYPE) RTJsonValueGetType(RTJSONVAL hJsonVal);
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| 145 |
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| 146 | /**
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| 147 | * Translates value type to a name.
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| 148 | *
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| 149 | * @returns Readonly name string
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| 150 | * @param enmType The JSON value type to name.
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| 151 | */
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| 152 | RTDECL(const char *) RTJsonValueTypeName(RTJSONVALTYPE enmType);
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| 153 |
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| 154 | /**
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| 155 | * Returns the string from a given JSON string value.
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| 156 | *
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| 157 | * @returns Pointer to the string of the JSON value, NULL if the value type
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| 158 | * doesn't indicate a string.
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| 159 | * @param hJsonVal The JSON value handle.
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| 160 | */
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| 161 | RTDECL(const char *) RTJsonValueGetString(RTJSONVAL hJsonVal);
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| 162 |
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| 163 | /**
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| 164 | * Returns the string from a given JSON string value, extended.
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| 165 | *
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| 166 | * @returns IPRT status code.
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| 167 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not a string.
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| 168 | * @param hJsonVal The JSON value handle.
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| 169 | * @param ppszStr Where to store the pointer to the string on success.
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| 170 | */
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| 171 | RTDECL(int) RTJsonValueQueryString(RTJSONVAL hJsonVal, const char **ppszStr);
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| 172 |
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| 173 | /**
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| 174 | * Returns the number from a given JSON number value.
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| 175 | *
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| 176 | * @returns IPRT status code.
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| 177 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not a number.
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| 178 | * @param hJsonVal The JSON value handle.
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| 179 | * @param pi64Num WHere to store the number on success.
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| 180 | *
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| 181 | * @note This JSON implementation does not implement support for floating point
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| 182 | * numbers currently. When it does, it will be in the form of a
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| 183 | * RTJsonValueQueryFloat method.
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| 184 | */
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| 185 | RTDECL(int) RTJsonValueQueryInteger(RTJSONVAL hJsonVal, int64_t *pi64Num);
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| 186 |
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| 187 | /**
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| 188 | * Returns the value associated with a given name for the given JSON object value.
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| 189 | *
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| 190 | * @returns IPRT status code.
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| 191 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object.
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| 192 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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| 193 | * @param hJsonVal The JSON value handle.
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| 194 | * @param pszName The member name of the object.
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| 195 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 196 | */
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| 197 | RTDECL(int) RTJsonValueQueryByName(RTJSONVAL hJsonVal, const char *pszName, PRTJSONVAL phJsonVal);
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| 198 |
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| 199 | /**
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| 200 | * Returns the number of a number value associated with a given name for the given JSON object value.
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| 201 | *
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| 202 | * @returns IPRT status code.
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| 203 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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| 204 | * the name does not point to a number value.
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| 205 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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| 206 | * @param hJsonVal The JSON value handle.
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| 207 | * @param pszName The member name of the object.
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| 208 | * @param pi64Num Where to store the number on success.
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| 209 | */
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| 210 | RTDECL(int) RTJsonValueQueryIntegerByName(RTJSONVAL hJsonVal, const char *pszName, int64_t *pi64Num);
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| 211 |
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| 212 | /**
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| 213 | * Returns the string of a string value associated with a given name for the given JSON object value.
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| 214 | *
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| 215 | * @returns IPRT status code.
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| 216 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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| 217 | * the name does not point to a string value.
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| 218 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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| 219 | * @param hJsonVal The JSON value handle.
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| 220 | * @param pszName The member name of the object.
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| 221 | * @param ppszStr Where to store the pointer to the string on success.
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| 222 | * Must be freed with RTStrFree().
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| 223 | */
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| 224 | RTDECL(int) RTJsonValueQueryStringByName(RTJSONVAL hJsonVal, const char *pszName, char **ppszStr);
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| 225 |
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| 226 | /**
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| 227 | * Returns the boolean of a true/false value associated with a given name for the given JSON object value.
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| 228 | *
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| 229 | * @returns IPRT status code.
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| 230 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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| 231 | * the name does not point to a true/false value.
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| 232 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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| 233 | * @param hJsonVal The JSON value handle.
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| 234 | * @param pszName The member name of the object.
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| 235 | * @param pfBoolean Where to store the boolean value on success.
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| 236 | */
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| 237 | RTDECL(int) RTJsonValueQueryBooleanByName(RTJSONVAL hJsonVal, const char *pszName, bool *pfBoolean);
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| 238 |
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| 239 | /**
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| 240 | * Returns the size of a given JSON array value.
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| 241 | *
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| 242 | * @returns Size of the JSON array value.
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| 243 | * @retval 0 if the array is empty or the JSON value is not an array.
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| 244 | * @param hJsonVal The JSON value handle.
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| 245 | */
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| 246 | RTDECL(unsigned) RTJsonValueGetArraySize(RTJSONVAL hJsonVal);
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| 247 |
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| 248 | /**
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| 249 | * Returns the size of a given JSON array value - extended version.
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| 250 | *
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| 251 | * @returns IPRT status code.
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| 252 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array.
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| 253 | * @param hJsonVal The JSON value handle.
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| 254 | * @param pcItems Where to store the size of the JSON array value on success.
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| 255 | */
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| 256 | RTDECL(int) RTJsonValueQueryArraySize(RTJSONVAL hJsonVal, unsigned *pcItems);
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| 257 |
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| 258 | /**
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| 259 | * Returns the value for the given index of a given JSON array value.
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| 260 | *
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| 261 | * @returns IPRT status code.
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| 262 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array.
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| 263 | * @retval VERR_OUT_OF_RANGE if @a idx is out of bounds.
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| 264 | *
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| 265 | * @param hJsonVal The JSON value handle.
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| 266 | * @param idx The index to get the value from.
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| 267 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 268 | */
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| 269 | RTDECL(int) RTJsonValueQueryByIndex(RTJSONVAL hJsonVal, unsigned idx, PRTJSONVAL phJsonVal);
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| 270 |
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| 271 | /**
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| 272 | * Creates an iterator for a given JSON array or object value.
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| 273 | *
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| 274 | * @returns IPRT status code.
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| 275 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array or
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| 276 | * object.
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| 277 | * @param hJsonVal The JSON value handle.
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| 278 | * @param phJsonIt Where to store the JSON iterator handle on success.
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| 279 | */
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| 280 | RTDECL(int) RTJsonIteratorBegin(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt);
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| 281 |
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| 282 | /**
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| 283 | * Gets the value and optional name for the current iterator position.
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| 284 | *
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| 285 | * @returns IPRT status code.
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| 286 | * @param hJsonIt The JSON iterator handle.
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| 287 | * @param phJsonVal Where to store the handle to the JSON value on success.
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| 288 | * @param ppszName Where to store the object member name for an object.
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| 289 | * NULL is returned for arrays.
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| 290 | */
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| 291 | RTDECL(int) RTJsonIteratorQueryValue(RTJSONIT hJsonIt, PRTJSONVAL phJsonVal, const char **ppszName);
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| 292 |
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| 293 | /**
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| 294 | * Advances to the next element in the referenced JSON value.
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| 295 | *
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| 296 | * @returns IPRT status code.
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| 297 | * @retval VERR_JSON_ITERATOR_END if the end for this iterator was reached.
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| 298 | * @param hJsonIt The JSON iterator handle.
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| 299 | */
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| 300 | RTDECL(int) RTJsonIteratorNext(RTJSONIT hJsonIt);
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| 301 |
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| 302 | /**
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| 303 | * Frees a given JSON iterator.
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| 304 | *
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| 305 | * @param hJsonIt The JSON iterator to free.
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| 306 | */
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| 307 | RTDECL(void) RTJsonIteratorFree(RTJSONIT hJsonIt);
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| 308 |
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| 309 | RT_C_DECLS_END
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| 310 |
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| 311 | /** @} */
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| 312 |
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| 313 | #endif
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| 314 |
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