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) 2016-2022 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.virtualbox.org.
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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 | /**
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96 | * Parses a JSON document in the provided buffer returning the root JSON value.
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97 | *
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98 | * @returns IPRT status code.
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99 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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100 | * @param phJsonVal Where to store the handle to the JSON value on success.
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101 | * @param pbBuf The byte buffer containing the JSON document.
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102 | * @param cbBuf Size of the buffer.
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103 | * @param pErrInfo Where to store extended error info. Optional.
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104 | *
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105 | * @todo r=bird: The use of uint8_t makes no sense here since the parser
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106 | * expects ASCII / UTF-8. What's more, if this is a real buffer the
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107 | * type should be 'const void *' rather than 'const uint8_t *'.
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108 | * This function should be modified to reflect that it's really for
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109 | * handling unterminated strings.
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110 | */
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111 | RTDECL(int) RTJsonParseFromBuf(PRTJSONVAL phJsonVal, const uint8_t *pbBuf, size_t cbBuf, PRTERRINFO pErrInfo);
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112 |
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113 | /**
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114 | * Parses a JSON document from the provided string returning the root JSON value.
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115 | *
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116 | * @returns IPRT status code.
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117 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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118 | * @param phJsonVal Where to store the handle to the JSON value on success.
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119 | * @param pszStr The string containing the JSON document.
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120 | * @param pErrInfo Where to store extended error info. Optional.
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121 | */
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122 | RTDECL(int) RTJsonParseFromString(PRTJSONVAL phJsonVal, const char *pszStr, PRTERRINFO pErrInfo);
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123 |
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124 | /**
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125 | * Parses a JSON document from the file pointed to by the given filename
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126 | * returning the root JSON value.
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127 | *
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128 | * @returns IPRT status code.
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129 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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130 | * @param phJsonVal Where to store the handle to the JSON value on success.
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131 | * @param pszFilename The name of the file containing the JSON document.
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132 | * @param pErrInfo Where to store extended error info. Optional.
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133 | */
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134 | RTDECL(int) RTJsonParseFromFile(PRTJSONVAL phJsonVal, const char *pszFilename, PRTERRINFO pErrInfo);
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135 |
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136 | /**
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137 | * Parses a JSON document from the given VFS file
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138 | * returning the root JSON value.
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139 | *
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140 | * @returns IPRT status code.
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141 | * @retval VERR_JSON_MALFORMED if the document does not conform to the spec.
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142 | * @param phJsonVal Where to store the handle to the JSON value on success.
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143 | * @param hVfsFile The VFS file to parse.
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144 | * @param pErrInfo Where to store extended error info. Optional.
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145 | */
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146 | RTDECL(int) RTJsonParseFromVfsFile(PRTJSONVAL phJsonVal, RTVFSFILE hVfsFile, PRTERRINFO pErrInfo);
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147 |
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148 | /**
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149 | * Retain a given JSON value.
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150 | *
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151 | * @returns New reference count.
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152 | * @param hJsonVal The JSON value handle.
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153 | */
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154 | RTDECL(uint32_t) RTJsonValueRetain(RTJSONVAL hJsonVal);
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155 |
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156 | /**
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157 | * Release a given JSON value.
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158 | *
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159 | * @returns New reference count, if this drops to 0 the value is freed.
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160 | * @param hJsonVal The JSON value handle.
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161 | */
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162 | RTDECL(uint32_t) RTJsonValueRelease(RTJSONVAL hJsonVal);
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163 |
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164 | /**
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165 | * Return the type of a given JSON value.
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166 | *
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167 | * @returns Type of the given JSON value.
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168 | * @param hJsonVal The JSON value handle.
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169 | */
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170 | RTDECL(RTJSONVALTYPE) RTJsonValueGetType(RTJSONVAL hJsonVal);
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171 |
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172 | /**
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173 | * Translates value type to a name.
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174 | *
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175 | * @returns Readonly name string
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176 | * @param enmType The JSON value type to name.
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177 | */
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178 | RTDECL(const char *) RTJsonValueTypeName(RTJSONVALTYPE enmType);
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179 |
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180 | /**
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181 | * Returns the string from a given JSON string value.
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182 | *
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183 | * @returns Pointer to the string of the JSON value, NULL if the value type
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184 | * doesn't indicate a string.
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185 | * @param hJsonVal The JSON value handle.
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186 | */
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187 | RTDECL(const char *) RTJsonValueGetString(RTJSONVAL hJsonVal);
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188 |
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189 | /**
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190 | * Returns the string from a given JSON string value, extended.
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191 | *
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192 | * @returns IPRT status code.
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193 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not a string.
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194 | * @param hJsonVal The JSON value handle.
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195 | * @param ppszStr Where to store the pointer to the string on success.
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196 | */
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197 | RTDECL(int) RTJsonValueQueryString(RTJSONVAL hJsonVal, const char **ppszStr);
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198 |
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199 | /**
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200 | * Returns the integer from a given JSON integer 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 a number.
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204 | * @param hJsonVal The JSON value handle.
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205 | * @param pi64Num WHere to store the number on success.
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206 | * @sa RTJsonValueQueryNumber
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207 | */
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208 | RTDECL(int) RTJsonValueQueryInteger(RTJSONVAL hJsonVal, int64_t *pi64Num);
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209 |
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210 | /**
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211 | * Returns the floating point value from a given JSON number 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 prdNum WHere to store the floating point number on success.
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217 | * @sa RTJsonValueQueryInteger
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218 | */
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219 | RTDECL(int) RTJsonValueQueryNumber(RTJSONVAL hJsonVal, double *prdNum);
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220 |
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221 | /**
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222 | * Returns the value associated with a given name for the given JSON object 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 an object.
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226 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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227 | * @param hJsonVal The JSON value handle.
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228 | * @param pszName The member name of the object.
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229 | * @param phJsonVal Where to store the handle to the JSON value on success.
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230 | */
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231 | RTDECL(int) RTJsonValueQueryByName(RTJSONVAL hJsonVal, const char *pszName, PRTJSONVAL phJsonVal);
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232 |
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233 | /**
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234 | * Returns the number of a number value associated with a given name for the given JSON object value.
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235 | *
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236 | * @returns IPRT status code.
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237 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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238 | * the name does not point to an integer value.
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239 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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240 | * @param hJsonVal The JSON value handle.
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241 | * @param pszName The member name of the object.
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242 | * @param pi64Num Where to store the number on success.
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243 | */
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244 | RTDECL(int) RTJsonValueQueryIntegerByName(RTJSONVAL hJsonVal, const char *pszName, int64_t *pi64Num);
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245 |
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246 | /**
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247 | * Returns the number of a number value associated with a given name for the given JSON object value.
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248 | *
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249 | * @returns IPRT status code.
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250 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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251 | * the name does not point to a number value.
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252 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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253 | * @param hJsonVal The JSON value handle.
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254 | * @param pszName The member name of the object.
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255 | * @param prdNum WHere to store the floating point number on success.
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256 | */
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257 | RTDECL(int) RTJsonValueQueryNumberByName(RTJSONVAL hJsonVal, const char *pszName, double *prdNum);
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258 |
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259 | /**
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260 | * Returns the string of a string value associated with a given name for the given JSON object value.
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261 | *
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262 | * @returns IPRT status code.
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263 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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264 | * the name does not point to a string value.
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265 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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266 | * @param hJsonVal The JSON value handle.
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267 | * @param pszName The member name of the object.
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268 | * @param ppszStr Where to store the pointer to the string on success.
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269 | * Must be freed with RTStrFree().
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270 | */
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271 | RTDECL(int) RTJsonValueQueryStringByName(RTJSONVAL hJsonVal, const char *pszName, char **ppszStr);
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272 |
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273 | /**
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274 | * Returns the boolean of a true/false value associated with a given name for the given JSON object value.
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275 | *
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276 | * @returns IPRT status code.
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277 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an object or
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278 | * the name does not point to a true/false value.
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279 | * @retval VERR_NOT_FOUND if the name is not known for this JSON object.
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280 | * @param hJsonVal The JSON value handle.
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281 | * @param pszName The member name of the object.
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282 | * @param pfBoolean Where to store the boolean value on success.
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283 | */
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284 | RTDECL(int) RTJsonValueQueryBooleanByName(RTJSONVAL hJsonVal, const char *pszName, bool *pfBoolean);
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285 |
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286 | /**
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287 | * Returns the size of a given JSON array value.
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288 | *
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289 | * @returns Size of the JSON array value.
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290 | * @retval 0 if the array is empty or the JSON value is not an array.
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291 | * @param hJsonVal The JSON value handle.
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292 | */
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293 | RTDECL(unsigned) RTJsonValueGetArraySize(RTJSONVAL hJsonVal);
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294 |
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295 | /**
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296 | * Returns the size of a given JSON array value - extended version.
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297 | *
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298 | * @returns IPRT status code.
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299 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array.
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300 | * @param hJsonVal The JSON value handle.
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301 | * @param pcItems Where to store the size of the JSON array value on success.
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302 | */
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303 | RTDECL(int) RTJsonValueQueryArraySize(RTJSONVAL hJsonVal, unsigned *pcItems);
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304 |
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305 | /**
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306 | * Returns the value for the given index of a given JSON array value.
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307 | *
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308 | * @returns IPRT status code.
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309 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array.
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310 | * @retval VERR_OUT_OF_RANGE if @a idx is out of bounds.
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311 | *
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312 | * @param hJsonVal The JSON value handle.
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313 | * @param idx The index to get the value from.
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314 | * @param phJsonVal Where to store the handle to the JSON value on success.
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315 | */
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316 | RTDECL(int) RTJsonValueQueryByIndex(RTJSONVAL hJsonVal, unsigned idx, PRTJSONVAL phJsonVal);
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317 |
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318 | /**
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319 | * Creates an iterator for a given JSON array or object value.
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320 | *
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321 | * @returns IPRT status code.
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322 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array or
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323 | * object.
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324 | * @param hJsonVal The JSON value handle.
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325 | * @param phJsonIt Where to store the JSON iterator handle on success.
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326 | * @todo Make return VERR_JSON_IS_EMPTY (or remove it).
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327 | */
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328 | RTDECL(int) RTJsonIteratorBegin(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt);
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329 |
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330 | /**
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331 | * Creates an iterator for a given JSON array value.
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332 | *
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333 | * @returns IPRT status code.
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334 | * @retval VERR_JSON_VALUE_INVALID_TYPE if the JSON value is not an array.
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335 | * @retval VERR_JSON_IS_EMPTY if no members.
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336 | * @param hJsonVal The JSON value handle.
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337 | * @param phJsonIt Where to store the JSON iterator handle on success.
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338 | */
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339 | RTDECL(int) RTJsonIteratorBeginArray(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 object 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 object.
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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) RTJsonIteratorBeginObject(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt);
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351 |
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352 | /**
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353 | * Gets the value and optional name for the current iterator position.
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354 | *
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355 | * @returns IPRT status code.
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356 | * @param hJsonIt The JSON iterator handle.
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357 | * @param phJsonVal Where to store the handle to the JSON value on success.
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358 | * @param ppszName Where to store the object member name for an object.
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359 | * NULL is returned for arrays.
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360 | */
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361 | RTDECL(int) RTJsonIteratorQueryValue(RTJSONIT hJsonIt, PRTJSONVAL phJsonVal, const char **ppszName);
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362 |
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363 | /**
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364 | * Advances to the next element in the referenced JSON value.
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365 | *
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366 | * @returns IPRT status code.
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367 | * @retval VERR_JSON_ITERATOR_END if the end for this iterator was reached.
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368 | * @param hJsonIt The JSON iterator handle.
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369 | */
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370 | RTDECL(int) RTJsonIteratorNext(RTJSONIT hJsonIt);
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371 |
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372 | /**
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373 | * Frees a given JSON iterator.
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374 | *
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375 | * @param hJsonIt The JSON iterator to free.
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376 | */
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377 | RTDECL(void) RTJsonIteratorFree(RTJSONIT hJsonIt);
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378 |
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379 | RT_C_DECLS_END
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380 |
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381 | /** @} */
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382 |
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383 | #endif /* !IPRT_INCLUDED_json_h */
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384 |
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