297 lines
7.5 KiB
C
297 lines
7.5 KiB
C
/*
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* QObject JSON integration
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*
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* Copyright IBM, Corp. 2009
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qapi/qmp/json-lexer.h"
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#include "qapi/qmp/json-parser.h"
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#include "qapi/qmp/json-streamer.h"
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#include "qapi/qmp/qjson.h"
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#include "qapi/qmp/types.h"
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#include "qemu/unicode.h"
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typedef struct JSONParsingState
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{
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JSONMessageParser parser;
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va_list *ap;
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QObject *result;
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Error *err;
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} JSONParsingState;
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static void parse_json(JSONMessageParser *parser, GQueue *tokens)
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{
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JSONParsingState *s = container_of(parser, JSONParsingState, parser);
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s->result = json_parser_parse_err(tokens, s->ap, &s->err);
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}
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QObject *qobject_from_jsonv(const char *string, va_list *ap, Error **errp)
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{
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JSONParsingState state = {};
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state.ap = ap;
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json_message_parser_init(&state.parser, parse_json);
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json_message_parser_feed(&state.parser, string, strlen(string));
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json_message_parser_flush(&state.parser);
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json_message_parser_destroy(&state.parser);
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error_propagate(errp, state.err);
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return state.result;
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}
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QObject *qobject_from_json(const char *string, Error **errp)
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{
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return qobject_from_jsonv(string, NULL, errp);
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}
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/*
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* IMPORTANT: This function aborts on error, thus it must not
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* be used with untrusted arguments.
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*/
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QObject *qobject_from_jsonf(const char *string, ...)
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{
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QObject *obj;
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va_list ap;
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va_start(ap, string);
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obj = qobject_from_jsonv(string, &ap, &error_abort);
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va_end(ap);
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assert(obj != NULL);
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return obj;
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}
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typedef struct ToJsonIterState
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{
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int indent;
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int pretty;
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int count;
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QString *str;
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} ToJsonIterState;
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static void to_json(const QObject *obj, QString *str, int pretty, int indent);
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static void to_json_dict_iter(const char *key, QObject *obj, void *opaque)
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{
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ToJsonIterState *s = opaque;
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QString *qkey;
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int j;
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if (s->count) {
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qstring_append(s->str, s->pretty ? "," : ", ");
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}
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if (s->pretty) {
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qstring_append(s->str, "\n");
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for (j = 0 ; j < s->indent ; j++)
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qstring_append(s->str, " ");
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}
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qkey = qstring_from_str(key);
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to_json(QOBJECT(qkey), s->str, s->pretty, s->indent);
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QDECREF(qkey);
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qstring_append(s->str, ": ");
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to_json(obj, s->str, s->pretty, s->indent);
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s->count++;
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}
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static void to_json_list_iter(QObject *obj, void *opaque)
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{
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ToJsonIterState *s = opaque;
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int j;
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if (s->count) {
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qstring_append(s->str, s->pretty ? "," : ", ");
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}
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if (s->pretty) {
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qstring_append(s->str, "\n");
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for (j = 0 ; j < s->indent ; j++)
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qstring_append(s->str, " ");
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}
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to_json(obj, s->str, s->pretty, s->indent);
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s->count++;
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}
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static void to_json(const QObject *obj, QString *str, int pretty, int indent)
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{
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switch (qobject_type(obj)) {
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case QTYPE_QNULL:
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qstring_append(str, "null");
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break;
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case QTYPE_QINT: {
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QInt *val = qobject_to_qint(obj);
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char buffer[1024];
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snprintf(buffer, sizeof(buffer), "%" PRId64, qint_get_int(val));
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qstring_append(str, buffer);
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break;
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}
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case QTYPE_QSTRING: {
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QString *val = qobject_to_qstring(obj);
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const char *ptr;
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int cp;
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char buf[16];
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char *end;
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ptr = qstring_get_str(val);
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qstring_append(str, "\"");
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for (; *ptr; ptr = end) {
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cp = mod_utf8_codepoint(ptr, 6, &end);
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switch (cp) {
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case '\"':
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qstring_append(str, "\\\"");
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break;
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case '\\':
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qstring_append(str, "\\\\");
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break;
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case '\b':
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qstring_append(str, "\\b");
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break;
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case '\f':
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qstring_append(str, "\\f");
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break;
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case '\n':
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qstring_append(str, "\\n");
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break;
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case '\r':
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qstring_append(str, "\\r");
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break;
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case '\t':
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qstring_append(str, "\\t");
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break;
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default:
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if (cp < 0) {
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cp = 0xFFFD; /* replacement character */
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}
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if (cp > 0xFFFF) {
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/* beyond BMP; need a surrogate pair */
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snprintf(buf, sizeof(buf), "\\u%04X\\u%04X",
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0xD800 + ((cp - 0x10000) >> 10),
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0xDC00 + ((cp - 0x10000) & 0x3FF));
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} else if (cp < 0x20 || cp >= 0x7F) {
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snprintf(buf, sizeof(buf), "\\u%04X", cp);
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} else {
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buf[0] = cp;
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buf[1] = 0;
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}
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qstring_append(str, buf);
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}
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};
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qstring_append(str, "\"");
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break;
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}
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case QTYPE_QDICT: {
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ToJsonIterState s;
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QDict *val = qobject_to_qdict(obj);
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s.count = 0;
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s.str = str;
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s.indent = indent + 1;
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s.pretty = pretty;
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qstring_append(str, "{");
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qdict_iter(val, to_json_dict_iter, &s);
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if (pretty) {
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int j;
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qstring_append(str, "\n");
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for (j = 0 ; j < indent ; j++)
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qstring_append(str, " ");
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}
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qstring_append(str, "}");
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break;
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}
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case QTYPE_QLIST: {
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ToJsonIterState s;
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QList *val = qobject_to_qlist(obj);
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s.count = 0;
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s.str = str;
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s.indent = indent + 1;
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s.pretty = pretty;
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qstring_append(str, "[");
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qlist_iter(val, (void *)to_json_list_iter, &s);
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if (pretty) {
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int j;
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qstring_append(str, "\n");
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for (j = 0 ; j < indent ; j++)
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qstring_append(str, " ");
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}
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qstring_append(str, "]");
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break;
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}
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case QTYPE_QFLOAT: {
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QFloat *val = qobject_to_qfloat(obj);
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char buffer[1024];
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int len;
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/* FIXME: snprintf() is locale dependent; but JSON requires
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* numbers to be formatted as if in the C locale. Dependence
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* on C locale is a pervasive issue in QEMU. */
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/* FIXME: This risks printing Inf or NaN, which are not valid
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* JSON values. */
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/* FIXME: the default precision of 6 for %f often causes
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* rounding errors; we should be using DBL_DECIMAL_DIG (17),
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* and only rounding to a shorter number if the result would
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* still produce the same floating point value. */
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len = snprintf(buffer, sizeof(buffer), "%f", qfloat_get_double(val));
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while (len > 0 && buffer[len - 1] == '0') {
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len--;
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}
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if (len && buffer[len - 1] == '.') {
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buffer[len - 1] = 0;
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} else {
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buffer[len] = 0;
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}
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qstring_append(str, buffer);
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break;
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}
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case QTYPE_QBOOL: {
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QBool *val = qobject_to_qbool(obj);
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if (qbool_get_bool(val)) {
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qstring_append(str, "true");
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} else {
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qstring_append(str, "false");
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}
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break;
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}
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default:
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abort();
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}
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}
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QString *qobject_to_json(const QObject *obj)
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{
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QString *str = qstring_new();
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to_json(obj, str, 0, 0);
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return str;
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}
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QString *qobject_to_json_pretty(const QObject *obj)
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{
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QString *str = qstring_new();
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to_json(obj, str, 1, 0);
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return str;
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}
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