DeleteFound removes the value addressed by keys and reports whether the value was found and removed. When found is false, result is data unchanged. SYS-REQ-010
(data []byte, keys ...string)
| 1132 | // value was found and removed. When found is false, result is data unchanged. |
| 1133 | // SYS-REQ-010 |
| 1134 | func DeleteFound(data []byte, keys ...string) (result []byte, found bool) { |
| 1135 | lk := len(keys) |
| 1136 | if lk == 0 { |
| 1137 | // Deleting the root produces an empty document whose backing array |
| 1138 | // must not alias the caller's input. |
| 1139 | return make([]byte, 0), true |
| 1140 | } |
| 1141 | |
| 1142 | array := false |
| 1143 | if len(keys[lk-1]) > 0 && string(keys[lk-1][0]) == "[" { |
| 1144 | array = true |
| 1145 | } |
| 1146 | |
| 1147 | var startOffset, keyOffset int |
| 1148 | endOffset := len(data) |
| 1149 | var err error |
| 1150 | if !array { |
| 1151 | if len(keys) > 1 { |
| 1152 | _, _, startOffset, endOffset, err = internalGet(data, keys[:lk-1]...) |
| 1153 | if err != nil { |
| 1154 | // problem parsing the data |
| 1155 | return data, false |
| 1156 | } |
| 1157 | } |
| 1158 | |
| 1159 | keyOffset, err = findKeyStart(data[startOffset:endOffset], keys[lk-1]) |
| 1160 | if err == KeyPathNotFoundError { |
| 1161 | // problem parsing the data |
| 1162 | return data, false |
| 1163 | } |
| 1164 | keyOffset += startOffset |
| 1165 | var subEndOffset int |
| 1166 | _, _, _, subEndOffset, err = internalGet(data[startOffset:endOffset], keys[lk-1]) |
| 1167 | if err != nil { |
| 1168 | return data, false |
| 1169 | } |
| 1170 | endOffset = startOffset + subEndOffset |
| 1171 | tokEnd := tokenEnd(data[endOffset:]) |
| 1172 | tokStart := findTokenStart(data[:keyOffset], ","[0]) |
| 1173 | |
| 1174 | if endOffset+tokEnd >= len(data) { |
| 1175 | // tokenEnd sentinel: no delimiter found, input is truncated |
| 1176 | return data, false |
| 1177 | } |
| 1178 | |
| 1179 | // guard: tokenEnd sentinel may return -1 on truncated input; bounds-check before deref. |
| 1180 | idx := endOffset + tokEnd |
| 1181 | // Scan forward from idx through any JSON whitespace to find the next |
| 1182 | // real token. The original check only matched a single ' ' byte |
| 1183 | // before the comma, so inputs like '{"a":1,\n"b":2}' or '[0,0 ,0]' |
| 1184 | // (multiple whitespace bytes) bypassed the cleanup and left a |
| 1185 | // dangling comma sequence. Found by FuzzPathMutation. |
| 1186 | nextTokIdx := idx |
| 1187 | for nextTokIdx < len(data) && isJSONWhitespace(data[nextTokIdx]) { |
| 1188 | nextTokIdx++ |
| 1189 | } |
| 1190 | if len(data) > idx && data[idx] == ',' { |
| 1191 | endOffset += tokEnd + 1 |