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-rw-r--r--contrib/qemu/qobject/json-parser.c724
1 files changed, 0 insertions, 724 deletions
diff --git a/contrib/qemu/qobject/json-parser.c b/contrib/qemu/qobject/json-parser.c
deleted file mode 100644
index e7947b340c1..00000000000
--- a/contrib/qemu/qobject/json-parser.c
+++ /dev/null
@@ -1,724 +0,0 @@
-/*
- * JSON Parser
- *
- * Copyright IBM, Corp. 2009
- *
- * Authors:
- * Anthony Liguori <aliguori@us.ibm.com>
- *
- * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
- * See the COPYING.LIB file in the top-level directory.
- *
- */
-
-#include <stdarg.h>
-
-#include "qemu-common.h"
-#include "qapi/qmp/qstring.h"
-#include "qapi/qmp/qint.h"
-#include "qapi/qmp/qdict.h"
-#include "qapi/qmp/qlist.h"
-#include "qapi/qmp/qfloat.h"
-#include "qapi/qmp/qbool.h"
-#include "qapi/qmp/json-parser.h"
-#include "qapi/qmp/json-lexer.h"
-#include "qapi/qmp/qerror.h"
-
-typedef struct JSONParserContext
-{
- Error *err;
- struct {
- QObject **buf;
- size_t pos;
- size_t count;
- } tokens;
-} JSONParserContext;
-
-#define BUG_ON(cond) assert(!(cond))
-
-/**
- * TODO
- *
- * 0) make errors meaningful again
- * 1) add geometry information to tokens
- * 3) should we return a parsed size?
- * 4) deal with premature EOI
- */
-
-static QObject *parse_value(JSONParserContext *ctxt, va_list *ap);
-
-/**
- * Token manipulators
- *
- * tokens are dictionaries that contain a type, a string value, and geometry information
- * about a token identified by the lexer. These are routines that make working with
- * these objects a bit easier.
- */
-static const char *token_get_value(QObject *obj)
-{
- return qdict_get_str(qobject_to_qdict(obj), "token");
-}
-
-static JSONTokenType token_get_type(QObject *obj)
-{
- return qdict_get_int(qobject_to_qdict(obj), "type");
-}
-
-static int token_is_operator(QObject *obj, char op)
-{
- const char *val;
-
- if (token_get_type(obj) != JSON_OPERATOR) {
- return 0;
- }
-
- val = token_get_value(obj);
-
- return (val[0] == op) && (val[1] == 0);
-}
-
-static int token_is_keyword(QObject *obj, const char *value)
-{
- if (token_get_type(obj) != JSON_KEYWORD) {
- return 0;
- }
-
- return strcmp(token_get_value(obj), value) == 0;
-}
-
-static int token_is_escape(QObject *obj, const char *value)
-{
- if (token_get_type(obj) != JSON_ESCAPE) {
- return 0;
- }
-
- return (strcmp(token_get_value(obj), value) == 0);
-}
-
-/**
- * Error handler
- */
-static void GCC_FMT_ATTR(3, 4) parse_error(JSONParserContext *ctxt,
- QObject *token, const char *msg, ...)
-{
- va_list ap;
- char message[1024];
- va_start(ap, msg);
- vsnprintf(message, sizeof(message), msg, ap);
- va_end(ap);
- if (ctxt->err) {
- error_free(ctxt->err);
- ctxt->err = NULL;
- }
- error_set(&ctxt->err, QERR_JSON_PARSE_ERROR, message);
-}
-
-/**
- * String helpers
- *
- * These helpers are used to unescape strings.
- */
-static void wchar_to_utf8(uint16_t wchar, char *buffer, size_t buffer_length)
-{
- if (wchar <= 0x007F) {
- BUG_ON(buffer_length < 2);
-
- buffer[0] = wchar & 0x7F;
- buffer[1] = 0;
- } else if (wchar <= 0x07FF) {
- BUG_ON(buffer_length < 3);
-
- buffer[0] = 0xC0 | ((wchar >> 6) & 0x1F);
- buffer[1] = 0x80 | (wchar & 0x3F);
- buffer[2] = 0;
- } else {
- BUG_ON(buffer_length < 4);
-
- buffer[0] = 0xE0 | ((wchar >> 12) & 0x0F);
- buffer[1] = 0x80 | ((wchar >> 6) & 0x3F);
- buffer[2] = 0x80 | (wchar & 0x3F);
- buffer[3] = 0;
- }
-}
-
-static int hex2decimal(char ch)
-{
- if (ch >= '0' && ch <= '9') {
- return (ch - '0');
- } else if (ch >= 'a' && ch <= 'f') {
- return 10 + (ch - 'a');
- } else if (ch >= 'A' && ch <= 'F') {
- return 10 + (ch - 'A');
- }
-
- return -1;
-}
-
-/**
- * parse_string(): Parse a json string and return a QObject
- *
- * string
- * ""
- * " chars "
- * chars
- * char
- * char chars
- * char
- * any-Unicode-character-
- * except-"-or-\-or-
- * control-character
- * \"
- * \\
- * \/
- * \b
- * \f
- * \n
- * \r
- * \t
- * \u four-hex-digits
- */
-static QString *qstring_from_escaped_str(JSONParserContext *ctxt, QObject *token)
-{
- const char *ptr = token_get_value(token);
- QString *str;
- int double_quote = 1;
-
- if (*ptr == '"') {
- double_quote = 1;
- } else {
- double_quote = 0;
- }
- ptr++;
-
- str = qstring_new();
- while (*ptr &&
- ((double_quote && *ptr != '"') || (!double_quote && *ptr != '\''))) {
- if (*ptr == '\\') {
- ptr++;
-
- switch (*ptr) {
- case '"':
- qstring_append(str, "\"");
- ptr++;
- break;
- case '\'':
- qstring_append(str, "'");
- ptr++;
- break;
- case '\\':
- qstring_append(str, "\\");
- ptr++;
- break;
- case '/':
- qstring_append(str, "/");
- ptr++;
- break;
- case 'b':
- qstring_append(str, "\b");
- ptr++;
- break;
- case 'f':
- qstring_append(str, "\f");
- ptr++;
- break;
- case 'n':
- qstring_append(str, "\n");
- ptr++;
- break;
- case 'r':
- qstring_append(str, "\r");
- ptr++;
- break;
- case 't':
- qstring_append(str, "\t");
- ptr++;
- break;
- case 'u': {
- uint16_t unicode_char = 0;
- char utf8_char[4];
- int i = 0;
-
- ptr++;
-
- for (i = 0; i < 4; i++) {
- if (qemu_isxdigit(*ptr)) {
- unicode_char |= hex2decimal(*ptr) << ((3 - i) * 4);
- } else {
- parse_error(ctxt, token,
- "invalid hex escape sequence in string");
- goto out;
- }
- ptr++;
- }
-
- wchar_to_utf8(unicode_char, utf8_char, sizeof(utf8_char));
- qstring_append(str, utf8_char);
- } break;
- default:
- parse_error(ctxt, token, "invalid escape sequence in string");
- goto out;
- }
- } else {
- char dummy[2];
-
- dummy[0] = *ptr++;
- dummy[1] = 0;
-
- qstring_append(str, dummy);
- }
- }
-
- return str;
-
-out:
- QDECREF(str);
- return NULL;
-}
-
-static QObject *parser_context_pop_token(JSONParserContext *ctxt)
-{
- QObject *token;
- g_assert(ctxt->tokens.pos < ctxt->tokens.count);
- token = ctxt->tokens.buf[ctxt->tokens.pos];
- ctxt->tokens.pos++;
- return token;
-}
-
-/* Note: parser_context_{peek|pop}_token do not increment the
- * token object's refcount. In both cases the references will continue
- * to be tracked and cleaned up in parser_context_free(), so do not
- * attempt to free the token object.
- */
-static QObject *parser_context_peek_token(JSONParserContext *ctxt)
-{
- QObject *token;
- g_assert(ctxt->tokens.pos < ctxt->tokens.count);
- token = ctxt->tokens.buf[ctxt->tokens.pos];
- return token;
-}
-
-static JSONParserContext parser_context_save(JSONParserContext *ctxt)
-{
- JSONParserContext saved_ctxt = {0};
- saved_ctxt.tokens.pos = ctxt->tokens.pos;
- saved_ctxt.tokens.count = ctxt->tokens.count;
- saved_ctxt.tokens.buf = ctxt->tokens.buf;
- return saved_ctxt;
-}
-
-static void parser_context_restore(JSONParserContext *ctxt,
- JSONParserContext saved_ctxt)
-{
- ctxt->tokens.pos = saved_ctxt.tokens.pos;
- ctxt->tokens.count = saved_ctxt.tokens.count;
- ctxt->tokens.buf = saved_ctxt.tokens.buf;
-}
-
-static void tokens_append_from_iter(QObject *obj, void *opaque)
-{
- JSONParserContext *ctxt = opaque;
- g_assert(ctxt->tokens.pos < ctxt->tokens.count);
- ctxt->tokens.buf[ctxt->tokens.pos++] = obj;
- qobject_incref(obj);
-}
-
-static JSONParserContext *parser_context_new(QList *tokens)
-{
- JSONParserContext *ctxt;
- size_t count;
-
- if (!tokens) {
- return NULL;
- }
-
- count = qlist_size(tokens);
- if (count == 0) {
- return NULL;
- }
-
- ctxt = g_malloc0(sizeof(JSONParserContext));
- ctxt->tokens.pos = 0;
- ctxt->tokens.count = count;
- ctxt->tokens.buf = g_malloc(count * sizeof(QObject *));
- qlist_iter(tokens, tokens_append_from_iter, ctxt);
- ctxt->tokens.pos = 0;
-
- return ctxt;
-}
-
-/* to support error propagation, ctxt->err must be freed separately */
-static void parser_context_free(JSONParserContext *ctxt)
-{
- int i;
- if (ctxt) {
- for (i = 0; i < ctxt->tokens.count; i++) {
- qobject_decref(ctxt->tokens.buf[i]);
- }
- g_free(ctxt->tokens.buf);
- g_free(ctxt);
- }
-}
-
-/**
- * Parsing rules
- */
-static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap)
-{
- QObject *key = NULL, *token = NULL, *value, *peek;
- JSONParserContext saved_ctxt = parser_context_save(ctxt);
-
- peek = parser_context_peek_token(ctxt);
- if (peek == NULL) {
- parse_error(ctxt, NULL, "premature EOI");
- goto out;
- }
-
- key = parse_value(ctxt, ap);
- if (!key || qobject_type(key) != QTYPE_QSTRING) {
- parse_error(ctxt, peek, "key is not a string in object");
- goto out;
- }
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- parse_error(ctxt, NULL, "premature EOI");
- goto out;
- }
-
- if (!token_is_operator(token, ':')) {
- parse_error(ctxt, token, "missing : in object pair");
- goto out;
- }
-
- value = parse_value(ctxt, ap);
- if (value == NULL) {
- parse_error(ctxt, token, "Missing value in dict");
- goto out;
- }
-
- qdict_put_obj(dict, qstring_get_str(qobject_to_qstring(key)), value);
-
- qobject_decref(key);
-
- return 0;
-
-out:
- parser_context_restore(ctxt, saved_ctxt);
- qobject_decref(key);
-
- return -1;
-}
-
-static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
-{
- QDict *dict = NULL;
- QObject *token, *peek;
- JSONParserContext saved_ctxt = parser_context_save(ctxt);
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- goto out;
- }
-
- if (!token_is_operator(token, '{')) {
- goto out;
- }
- token = NULL;
-
- dict = qdict_new();
-
- peek = parser_context_peek_token(ctxt);
- if (peek == NULL) {
- parse_error(ctxt, NULL, "premature EOI");
- goto out;
- }
-
- if (!token_is_operator(peek, '}')) {
- if (parse_pair(ctxt, dict, ap) == -1) {
- goto out;
- }
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- parse_error(ctxt, NULL, "premature EOI");
- goto out;
- }
-
- while (!token_is_operator(token, '}')) {
- if (!token_is_operator(token, ',')) {
- parse_error(ctxt, token, "expected separator in dict");
- goto out;
- }
- token = NULL;
-
- if (parse_pair(ctxt, dict, ap) == -1) {
- goto out;
- }
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- parse_error(ctxt, NULL, "premature EOI");
- goto out;
- }
- }
- token = NULL;
- } else {
- token = parser_context_pop_token(ctxt);
- token = NULL;
- }
-
- return QOBJECT(dict);
-
-out:
- parser_context_restore(ctxt, saved_ctxt);
- QDECREF(dict);
- return NULL;
-}
-
-static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
-{
- QList *list = NULL;
- QObject *token, *peek;
- JSONParserContext saved_ctxt = parser_context_save(ctxt);
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- goto out;
- }
-
- if (!token_is_operator(token, '[')) {
- token = NULL;
- goto out;
- }
- token = NULL;
-
- list = qlist_new();
-
- peek = parser_context_peek_token(ctxt);
- if (peek == NULL) {
- parse_error(ctxt, NULL, "premature EOI");
- goto out;
- }
-
- if (!token_is_operator(peek, ']')) {
- QObject *obj;
-
- obj = parse_value(ctxt, ap);
- if (obj == NULL) {
- parse_error(ctxt, token, "expecting value");
- goto out;
- }
-
- qlist_append_obj(list, obj);
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- parse_error(ctxt, NULL, "premature EOI");
- goto out;
- }
-
- while (!token_is_operator(token, ']')) {
- if (!token_is_operator(token, ',')) {
- parse_error(ctxt, token, "expected separator in list");
- goto out;
- }
-
- token = NULL;
-
- obj = parse_value(ctxt, ap);
- if (obj == NULL) {
- parse_error(ctxt, token, "expecting value");
- goto out;
- }
-
- qlist_append_obj(list, obj);
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- parse_error(ctxt, NULL, "premature EOI");
- goto out;
- }
- }
-
- token = NULL;
- } else {
- token = parser_context_pop_token(ctxt);
- token = NULL;
- }
-
- return QOBJECT(list);
-
-out:
- parser_context_restore(ctxt, saved_ctxt);
- QDECREF(list);
- return NULL;
-}
-
-static QObject *parse_keyword(JSONParserContext *ctxt)
-{
- QObject *token, *ret;
- JSONParserContext saved_ctxt = parser_context_save(ctxt);
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- goto out;
- }
-
- if (token_get_type(token) != JSON_KEYWORD) {
- goto out;
- }
-
- if (token_is_keyword(token, "true")) {
- ret = QOBJECT(qbool_from_int(true));
- } else if (token_is_keyword(token, "false")) {
- ret = QOBJECT(qbool_from_int(false));
- } else {
- parse_error(ctxt, token, "invalid keyword `%s'", token_get_value(token));
- goto out;
- }
-
- return ret;
-
-out:
- parser_context_restore(ctxt, saved_ctxt);
-
- return NULL;
-}
-
-static QObject *parse_escape(JSONParserContext *ctxt, va_list *ap)
-{
- QObject *token = NULL, *obj;
- JSONParserContext saved_ctxt = parser_context_save(ctxt);
-
- if (ap == NULL) {
- goto out;
- }
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- goto out;
- }
-
- if (token_is_escape(token, "%p")) {
- obj = va_arg(*ap, QObject *);
- } else if (token_is_escape(token, "%i")) {
- obj = QOBJECT(qbool_from_int(va_arg(*ap, int)));
- } else if (token_is_escape(token, "%d")) {
- obj = QOBJECT(qint_from_int(va_arg(*ap, int)));
- } else if (token_is_escape(token, "%ld")) {
- obj = QOBJECT(qint_from_int(va_arg(*ap, long)));
- } else if (token_is_escape(token, "%lld") ||
- token_is_escape(token, "%I64d")) {
- obj = QOBJECT(qint_from_int(va_arg(*ap, long long)));
- } else if (token_is_escape(token, "%s")) {
- obj = QOBJECT(qstring_from_str(va_arg(*ap, const char *)));
- } else if (token_is_escape(token, "%f")) {
- obj = QOBJECT(qfloat_from_double(va_arg(*ap, double)));
- } else {
- goto out;
- }
-
- return obj;
-
-out:
- parser_context_restore(ctxt, saved_ctxt);
-
- return NULL;
-}
-
-static QObject *parse_literal(JSONParserContext *ctxt)
-{
- QObject *token, *obj;
- JSONParserContext saved_ctxt = parser_context_save(ctxt);
-
- token = parser_context_pop_token(ctxt);
- if (token == NULL) {
- goto out;
- }
-
- switch (token_get_type(token)) {
- case JSON_STRING:
- obj = QOBJECT(qstring_from_escaped_str(ctxt, token));
- break;
- case JSON_INTEGER: {
- /* A possibility exists that this is a whole-valued float where the
- * fractional part was left out due to being 0 (.0). It's not a big
- * deal to treat these as ints in the parser, so long as users of the
- * resulting QObject know to expect a QInt in place of a QFloat in
- * cases like these.
- *
- * However, in some cases these values will overflow/underflow a
- * QInt/int64 container, thus we should assume these are to be handled
- * as QFloats/doubles rather than silently changing their values.
- *
- * strtoll() indicates these instances by setting errno to ERANGE
- */
- int64_t value;
-
- errno = 0; /* strtoll doesn't set errno on success */
- value = strtoll(token_get_value(token), NULL, 10);
- if (errno != ERANGE) {
- obj = QOBJECT(qint_from_int(value));
- break;
- }
- /* fall through to JSON_FLOAT */
- }
- case JSON_FLOAT:
- /* FIXME dependent on locale */
- obj = QOBJECT(qfloat_from_double(strtod(token_get_value(token), NULL)));
- break;
- default:
- goto out;
- }
-
- return obj;
-
-out:
- parser_context_restore(ctxt, saved_ctxt);
-
- return NULL;
-}
-
-static QObject *parse_value(JSONParserContext *ctxt, va_list *ap)
-{
- QObject *obj;
-
- obj = parse_object(ctxt, ap);
- if (obj == NULL) {
- obj = parse_array(ctxt, ap);
- }
- if (obj == NULL) {
- obj = parse_escape(ctxt, ap);
- }
- if (obj == NULL) {
- obj = parse_keyword(ctxt);
- }
- if (obj == NULL) {
- obj = parse_literal(ctxt);
- }
-
- return obj;
-}
-
-QObject *json_parser_parse(QList *tokens, va_list *ap)
-{
- return json_parser_parse_err(tokens, ap, NULL);
-}
-
-QObject *json_parser_parse_err(QList *tokens, va_list *ap, Error **errp)
-{
- JSONParserContext *ctxt = parser_context_new(tokens);
- QObject *result;
-
- if (!ctxt) {
- return NULL;
- }
-
- result = parse_value(ctxt, ap);
-
- error_propagate(errp, ctxt->err);
-
- parser_context_free(ctxt);
-
- return result;
-}