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7b1cd1c65a
qdict_iter() has just three uses and no test coverage. Replace by qdict_first(), qdict_next() for more concise code and less type punning. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20200415083048.14339-5-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
314 lines
8.0 KiB
C
314 lines
8.0 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-parser.h"
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#include "qapi/qmp/qjson.h"
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#include "qapi/qmp/qbool.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qlist.h"
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#include "qapi/qmp/qnum.h"
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#include "qapi/qmp/qstring.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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QObject *result;
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Error *err;
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} JSONParsingState;
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static void consume_json(void *opaque, QObject *json, Error *err)
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{
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JSONParsingState *s = opaque;
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assert(!json != !err);
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assert(!s->result || !s->err);
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if (s->result) {
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qobject_unref(s->result);
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s->result = NULL;
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error_setg(&s->err, "Expecting at most one JSON value");
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}
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if (s->err) {
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qobject_unref(json);
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error_free(err);
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return;
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}
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s->result = json;
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s->err = err;
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}
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/*
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* Parse @string as JSON value.
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* If @ap is non-null, interpolate %-escapes.
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* Takes ownership of %p arguments.
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* On success, return the JSON value.
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* On failure, store an error through @errp and return NULL.
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* Ownership of %p arguments becomes indeterminate then. To avoid
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* leaks, callers passing %p must terminate on error, e.g. by passing
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* &error_abort.
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*/
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static QObject *qobject_from_jsonv(const char *string, va_list *ap,
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Error **errp)
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{
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JSONParsingState state = {};
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json_message_parser_init(&state.parser, consume_json, &state, ap);
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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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if (!state.result && !state.err) {
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error_setg(&state.err, "Expecting a JSON value");
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}
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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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* Parse @string as JSON value with %-escapes interpolated.
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* Abort on error. Do not use with untrusted @string.
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* Return the resulting QObject. It is never null.
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*/
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QObject *qobject_from_vjsonf_nofail(const char *string, va_list ap)
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{
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va_list ap_copy;
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QObject *obj;
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/* va_copy() is needed when va_list is an array type */
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va_copy(ap_copy, ap);
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obj = qobject_from_jsonv(string, &ap_copy, &error_abort);
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va_end(ap_copy);
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assert(obj);
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return obj;
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}
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/*
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* Parse @string as JSON value with %-escapes interpolated.
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* Abort on error. Do not use with untrusted @string.
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* Return the resulting QObject. It is never null.
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*/
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QObject *qobject_from_jsonf_nofail(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_vjsonf_nofail(string, ap);
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va_end(ap);
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return obj;
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}
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/*
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* Parse @string as JSON object with %-escapes interpolated.
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* Abort on error. Do not use with untrusted @string.
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* Return the resulting QDict. It is never null.
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*/
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QDict *qdict_from_vjsonf_nofail(const char *string, va_list ap)
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{
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QDict *qdict;
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qdict = qobject_to(QDict, qobject_from_vjsonf_nofail(string, ap));
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assert(qdict);
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return qdict;
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}
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/*
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* Parse @string as JSON object with %-escapes interpolated.
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* Abort on error. Do not use with untrusted @string.
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* Return the resulting QDict. It is never null.
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*/
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QDict *qdict_from_jsonf_nofail(const char *string, ...)
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{
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QDict *qdict;
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va_list ap;
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va_start(ap, string);
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qdict = qdict_from_vjsonf_nofail(string, ap);
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va_end(ap);
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return qdict;
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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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static void json_pretty_newline(QString *str, bool pretty, int indent)
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{
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int i;
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if (pretty) {
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qstring_append(str, "\n");
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for (i = 0; i < indent; i++) {
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qstring_append(str, " ");
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}
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}
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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_QNUM: {
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QNum *val = qobject_to(QNum, obj);
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char *buffer = qnum_to_string(val);
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qstring_append(str, buffer);
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g_free(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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QDict *val = qobject_to(QDict, obj);
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const char *comma = pretty ? "," : ", ";
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const char *sep = "";
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const QDictEntry *entry;
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QString *qkey;
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qstring_append(str, "{");
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for (entry = qdict_first(val);
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entry;
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entry = qdict_next(val, entry)) {
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qstring_append(str, sep);
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json_pretty_newline(str, pretty, indent + 1);
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qkey = qstring_from_str(qdict_entry_key(entry));
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to_json(QOBJECT(qkey), str, pretty, indent + 1);
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qobject_unref(qkey);
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qstring_append(str, ": ");
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to_json(qdict_entry_value(entry), str, pretty, indent + 1);
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sep = comma;
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}
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json_pretty_newline(str, pretty, indent);
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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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QList *val = qobject_to(QList, obj);
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const char *comma = pretty ? "," : ", ";
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const char *sep = "";
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QListEntry *entry;
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qstring_append(str, "[");
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QLIST_FOREACH_ENTRY(val, entry) {
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qstring_append(str, sep);
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json_pretty_newline(str, pretty, indent + 1);
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to_json(qlist_entry_obj(entry), str, pretty, indent + 1);
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sep = comma;
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}
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json_pretty_newline(str, pretty, indent);
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qstring_append(str, "]");
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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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