diff options
Diffstat (limited to 'qobject')
| -rw-r--r-- | qobject/Makefile.objs | 2 | ||||
| -rw-r--r-- | qobject/json-lexer.c | 373 | ||||
| -rw-r--r-- | qobject/json-parser.c | 714 | ||||
| -rw-r--r-- | qobject/json-streamer.c | 122 | ||||
| -rw-r--r-- | qobject/qbool.c | 68 | ||||
| -rw-r--r-- | qobject/qdict.c | 802 | ||||
| -rw-r--r-- | qobject/qfloat.c | 68 | ||||
| -rw-r--r-- | qobject/qint.c | 67 | ||||
| -rw-r--r-- | qobject/qjson.c | 285 | ||||
| -rw-r--r-- | qobject/qlist.c | 170 | ||||
| -rw-r--r-- | qobject/qnull.c | 29 | ||||
| -rw-r--r-- | qobject/qstring.c | 149 |
12 files changed, 2849 insertions, 0 deletions
diff --git a/qobject/Makefile.objs b/qobject/Makefile.objs new file mode 100644 index 00000000..0031e8b6 --- /dev/null +++ b/qobject/Makefile.objs @@ -0,0 +1,2 @@ +util-obj-y = qnull.o qint.o qstring.o qdict.o qlist.o qfloat.o qbool.o +util-obj-y += qjson.o json-lexer.o json-streamer.o json-parser.o diff --git a/qobject/json-lexer.c b/qobject/json-lexer.c new file mode 100644 index 00000000..b19623e2 --- /dev/null +++ b/qobject/json-lexer.c @@ -0,0 +1,373 @@ +/* + * JSON lexer + * + * 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 "qapi/qmp/qstring.h" +#include "qapi/qmp/qlist.h" +#include "qapi/qmp/qdict.h" +#include "qapi/qmp/qint.h" +#include "qemu-common.h" +#include "qapi/qmp/json-lexer.h" + +#define MAX_TOKEN_SIZE (64ULL << 20) + +/* + * \"([^\\\"]|(\\\"\\'\\\\\\/\\b\\f\\n\\r\\t\\u[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]))*\" + * '([^\\']|(\\\"\\'\\\\\\/\\b\\f\\n\\r\\t\\u[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]))*' + * 0|([1-9][0-9]*(.[0-9]+)?([eE]([-+])?[0-9]+)) + * [{}\[\],:] + * [a-z]+ + * + */ + +enum json_lexer_state { + IN_ERROR = 0, + IN_DQ_UCODE3, + IN_DQ_UCODE2, + IN_DQ_UCODE1, + IN_DQ_UCODE0, + IN_DQ_STRING_ESCAPE, + IN_DQ_STRING, + IN_SQ_UCODE3, + IN_SQ_UCODE2, + IN_SQ_UCODE1, + IN_SQ_UCODE0, + IN_SQ_STRING_ESCAPE, + IN_SQ_STRING, + IN_ZERO, + IN_DIGITS, + IN_DIGIT, + IN_EXP_E, + IN_MANTISSA, + IN_MANTISSA_DIGITS, + IN_NONZERO_NUMBER, + IN_NEG_NONZERO_NUMBER, + IN_KEYWORD, + IN_ESCAPE, + IN_ESCAPE_L, + IN_ESCAPE_LL, + IN_ESCAPE_I, + IN_ESCAPE_I6, + IN_ESCAPE_I64, + IN_WHITESPACE, + IN_START, +}; + +#define TERMINAL(state) [0 ... 0x7F] = (state) + +/* Return whether TERMINAL is a terminal state and the transition to it + from OLD_STATE required lookahead. This happens whenever the table + below uses the TERMINAL macro. */ +#define TERMINAL_NEEDED_LOOKAHEAD(old_state, terminal) \ + (json_lexer[(old_state)][0] == (terminal)) + +static const uint8_t json_lexer[][256] = { + /* double quote string */ + [IN_DQ_UCODE3] = { + ['0' ... '9'] = IN_DQ_STRING, + ['a' ... 'f'] = IN_DQ_STRING, + ['A' ... 'F'] = IN_DQ_STRING, + }, + [IN_DQ_UCODE2] = { + ['0' ... '9'] = IN_DQ_UCODE3, + ['a' ... 'f'] = IN_DQ_UCODE3, + ['A' ... 'F'] = IN_DQ_UCODE3, + }, + [IN_DQ_UCODE1] = { + ['0' ... '9'] = IN_DQ_UCODE2, + ['a' ... 'f'] = IN_DQ_UCODE2, + ['A' ... 'F'] = IN_DQ_UCODE2, + }, + [IN_DQ_UCODE0] = { + ['0' ... '9'] = IN_DQ_UCODE1, + ['a' ... 'f'] = IN_DQ_UCODE1, + ['A' ... 'F'] = IN_DQ_UCODE1, + }, + [IN_DQ_STRING_ESCAPE] = { + ['b'] = IN_DQ_STRING, + ['f'] = IN_DQ_STRING, + ['n'] = IN_DQ_STRING, + ['r'] = IN_DQ_STRING, + ['t'] = IN_DQ_STRING, + ['/'] = IN_DQ_STRING, + ['\\'] = IN_DQ_STRING, + ['\''] = IN_DQ_STRING, + ['\"'] = IN_DQ_STRING, + ['u'] = IN_DQ_UCODE0, + }, + [IN_DQ_STRING] = { + [1 ... 0xBF] = IN_DQ_STRING, + [0xC2 ... 0xF4] = IN_DQ_STRING, + ['\\'] = IN_DQ_STRING_ESCAPE, + ['"'] = JSON_STRING, + }, + + /* single quote string */ + [IN_SQ_UCODE3] = { + ['0' ... '9'] = IN_SQ_STRING, + ['a' ... 'f'] = IN_SQ_STRING, + ['A' ... 'F'] = IN_SQ_STRING, + }, + [IN_SQ_UCODE2] = { + ['0' ... '9'] = IN_SQ_UCODE3, + ['a' ... 'f'] = IN_SQ_UCODE3, + ['A' ... 'F'] = IN_SQ_UCODE3, + }, + [IN_SQ_UCODE1] = { + ['0' ... '9'] = IN_SQ_UCODE2, + ['a' ... 'f'] = IN_SQ_UCODE2, + ['A' ... 'F'] = IN_SQ_UCODE2, + }, + [IN_SQ_UCODE0] = { + ['0' ... '9'] = IN_SQ_UCODE1, + ['a' ... 'f'] = IN_SQ_UCODE1, + ['A' ... 'F'] = IN_SQ_UCODE1, + }, + [IN_SQ_STRING_ESCAPE] = { + ['b'] = IN_SQ_STRING, + ['f'] = IN_SQ_STRING, + ['n'] = IN_SQ_STRING, + ['r'] = IN_SQ_STRING, + ['t'] = IN_SQ_STRING, + ['/'] = IN_SQ_STRING, + ['\\'] = IN_SQ_STRING, + ['\''] = IN_SQ_STRING, + ['\"'] = IN_SQ_STRING, + ['u'] = IN_SQ_UCODE0, + }, + [IN_SQ_STRING] = { + [1 ... 0xBF] = IN_SQ_STRING, + [0xC2 ... 0xF4] = IN_SQ_STRING, + ['\\'] = IN_SQ_STRING_ESCAPE, + ['\''] = JSON_STRING, + }, + + /* Zero */ + [IN_ZERO] = { + TERMINAL(JSON_INTEGER), + ['0' ... '9'] = IN_ERROR, + ['.'] = IN_MANTISSA, + }, + + /* Float */ + [IN_DIGITS] = { + TERMINAL(JSON_FLOAT), + ['0' ... '9'] = IN_DIGITS, + }, + + [IN_DIGIT] = { + ['0' ... '9'] = IN_DIGITS, + }, + + [IN_EXP_E] = { + ['-'] = IN_DIGIT, + ['+'] = IN_DIGIT, + ['0' ... '9'] = IN_DIGITS, + }, + + [IN_MANTISSA_DIGITS] = { + TERMINAL(JSON_FLOAT), + ['0' ... '9'] = IN_MANTISSA_DIGITS, + ['e'] = IN_EXP_E, + ['E'] = IN_EXP_E, + }, + + [IN_MANTISSA] = { + ['0' ... '9'] = IN_MANTISSA_DIGITS, + }, + + /* Number */ + [IN_NONZERO_NUMBER] = { + TERMINAL(JSON_INTEGER), + ['0' ... '9'] = IN_NONZERO_NUMBER, + ['e'] = IN_EXP_E, + ['E'] = IN_EXP_E, + ['.'] = IN_MANTISSA, + }, + + [IN_NEG_NONZERO_NUMBER] = { + ['0'] = IN_ZERO, + ['1' ... '9'] = IN_NONZERO_NUMBER, + }, + + /* keywords */ + [IN_KEYWORD] = { + TERMINAL(JSON_KEYWORD), + ['a' ... 'z'] = IN_KEYWORD, + }, + + /* whitespace */ + [IN_WHITESPACE] = { + TERMINAL(JSON_SKIP), + [' '] = IN_WHITESPACE, + ['\t'] = IN_WHITESPACE, + ['\r'] = IN_WHITESPACE, + ['\n'] = IN_WHITESPACE, + }, + + /* escape */ + [IN_ESCAPE_LL] = { + ['d'] = JSON_ESCAPE, + }, + + [IN_ESCAPE_L] = { + ['d'] = JSON_ESCAPE, + ['l'] = IN_ESCAPE_LL, + }, + + [IN_ESCAPE_I64] = { + ['d'] = JSON_ESCAPE, + }, + + [IN_ESCAPE_I6] = { + ['4'] = IN_ESCAPE_I64, + }, + + [IN_ESCAPE_I] = { + ['6'] = IN_ESCAPE_I6, + }, + + [IN_ESCAPE] = { + ['d'] = JSON_ESCAPE, + ['i'] = JSON_ESCAPE, + ['p'] = JSON_ESCAPE, + ['s'] = JSON_ESCAPE, + ['f'] = JSON_ESCAPE, + ['l'] = IN_ESCAPE_L, + ['I'] = IN_ESCAPE_I, + }, + + /* top level rule */ + [IN_START] = { + ['"'] = IN_DQ_STRING, + ['\''] = IN_SQ_STRING, + ['0'] = IN_ZERO, + ['1' ... '9'] = IN_NONZERO_NUMBER, + ['-'] = IN_NEG_NONZERO_NUMBER, + ['{'] = JSON_OPERATOR, + ['}'] = JSON_OPERATOR, + ['['] = JSON_OPERATOR, + [']'] = JSON_OPERATOR, + [','] = JSON_OPERATOR, + [':'] = JSON_OPERATOR, + ['a' ... 'z'] = IN_KEYWORD, + ['%'] = IN_ESCAPE, + [' '] = IN_WHITESPACE, + ['\t'] = IN_WHITESPACE, + ['\r'] = IN_WHITESPACE, + ['\n'] = IN_WHITESPACE, + }, +}; + +void json_lexer_init(JSONLexer *lexer, JSONLexerEmitter func) +{ + lexer->emit = func; + lexer->state = IN_START; + lexer->token = qstring_new(); + lexer->x = lexer->y = 0; +} + +static int json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush) +{ + int char_consumed, new_state; + + lexer->x++; + if (ch == '\n') { + lexer->x = 0; + lexer->y++; + } + + do { + new_state = json_lexer[lexer->state][(uint8_t)ch]; + char_consumed = !TERMINAL_NEEDED_LOOKAHEAD(lexer->state, new_state); + if (char_consumed) { + qstring_append_chr(lexer->token, ch); + } + + switch (new_state) { + case JSON_OPERATOR: + case JSON_ESCAPE: + case JSON_INTEGER: + case JSON_FLOAT: + case JSON_KEYWORD: + case JSON_STRING: + lexer->emit(lexer, lexer->token, new_state, lexer->x, lexer->y); + /* fall through */ + case JSON_SKIP: + QDECREF(lexer->token); + lexer->token = qstring_new(); + new_state = IN_START; + break; + case IN_ERROR: + /* XXX: To avoid having previous bad input leaving the parser in an + * unresponsive state where we consume unpredictable amounts of + * subsequent "good" input, percolate this error state up to the + * tokenizer/parser by forcing a NULL object to be emitted, then + * reset state. + * + * Also note that this handling is required for reliable channel + * negotiation between QMP and the guest agent, since chr(0xFF) + * is placed at the beginning of certain events to ensure proper + * delivery when the channel is in an unknown state. chr(0xFF) is + * never a valid ASCII/UTF-8 sequence, so this should reliably + * induce an error/flush state. + */ + lexer->emit(lexer, lexer->token, JSON_ERROR, lexer->x, lexer->y); + QDECREF(lexer->token); + lexer->token = qstring_new(); + new_state = IN_START; + lexer->state = new_state; + return 0; + default: + break; + } + lexer->state = new_state; + } while (!char_consumed && !flush); + + /* Do not let a single token grow to an arbitrarily large size, + * this is a security consideration. + */ + if (lexer->token->length > MAX_TOKEN_SIZE) { + lexer->emit(lexer, lexer->token, lexer->state, lexer->x, lexer->y); + QDECREF(lexer->token); + lexer->token = qstring_new(); + lexer->state = IN_START; + } + + return 0; +} + +int json_lexer_feed(JSONLexer *lexer, const char *buffer, size_t size) +{ + size_t i; + + for (i = 0; i < size; i++) { + int err; + + err = json_lexer_feed_char(lexer, buffer[i], false); + if (err < 0) { + return err; + } + } + + return 0; +} + +int json_lexer_flush(JSONLexer *lexer) +{ + return lexer->state == IN_START ? 0 : json_lexer_feed_char(lexer, 0, true); +} + +void json_lexer_destroy(JSONLexer *lexer) +{ + QDECREF(lexer->token); +} diff --git a/qobject/json-parser.c b/qobject/json-parser.c new file mode 100644 index 00000000..ac991ba3 --- /dev/null +++ b/qobject/json-parser.c @@ -0,0 +1,714 @@ +/* + * 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" + +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_setg(&ctxt->err, "JSON parse error, %s", 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; + } + + 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; + } + + 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; + } + } + } else { + (void)parser_context_pop_token(ctxt); + } + + 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, '[')) { + goto out; + } + + 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; + } + + 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; + } + } + } else { + (void)parser_context_pop_token(ctxt); + } + + 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_bool(true)); + } else if (token_is_keyword(token, "false")) { + ret = QOBJECT(qbool_from_bool(false)); + } else if (token_is_keyword(token, "null")) { + ret = qnull(); + } 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_bool(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; +} diff --git a/qobject/json-streamer.c b/qobject/json-streamer.c new file mode 100644 index 00000000..1b2f9b1d --- /dev/null +++ b/qobject/json-streamer.c @@ -0,0 +1,122 @@ +/* + * JSON streaming support + * + * 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 "qapi/qmp/qlist.h" +#include "qapi/qmp/qint.h" +#include "qapi/qmp/qdict.h" +#include "qemu-common.h" +#include "qapi/qmp/json-lexer.h" +#include "qapi/qmp/json-streamer.h" + +#define MAX_TOKEN_SIZE (64ULL << 20) +#define MAX_NESTING (1ULL << 10) + +static void json_message_process_token(JSONLexer *lexer, QString *token, JSONTokenType type, int x, int y) +{ + JSONMessageParser *parser = container_of(lexer, JSONMessageParser, lexer); + QDict *dict; + + if (type == JSON_OPERATOR) { + switch (qstring_get_str(token)[0]) { + case '{': + parser->brace_count++; + break; + case '}': + parser->brace_count--; + break; + case '[': + parser->bracket_count++; + break; + case ']': + parser->bracket_count--; + break; + default: + break; + } + } + + dict = qdict_new(); + qdict_put(dict, "type", qint_from_int(type)); + QINCREF(token); + qdict_put(dict, "token", token); + qdict_put(dict, "x", qint_from_int(x)); + qdict_put(dict, "y", qint_from_int(y)); + + parser->token_size += token->length; + + qlist_append(parser->tokens, dict); + + if (type == JSON_ERROR) { + goto out_emit_bad; + } else if (parser->brace_count < 0 || + parser->bracket_count < 0 || + (parser->brace_count == 0 && + parser->bracket_count == 0)) { + goto out_emit; + } else if (parser->token_size > MAX_TOKEN_SIZE || + parser->bracket_count > MAX_NESTING || + parser->brace_count > MAX_NESTING) { + /* Security consideration, we limit total memory allocated per object + * and the maximum recursion depth that a message can force. + */ + goto out_emit; + } + + return; + +out_emit_bad: + /* clear out token list and tell the parser to emit and error + * indication by passing it a NULL list + */ + QDECREF(parser->tokens); + parser->tokens = NULL; +out_emit: + /* send current list of tokens to parser and reset tokenizer */ + parser->brace_count = 0; + parser->bracket_count = 0; + parser->emit(parser, parser->tokens); + if (parser->tokens) { + QDECREF(parser->tokens); + } + parser->tokens = qlist_new(); + parser->token_size = 0; +} + +void json_message_parser_init(JSONMessageParser *parser, + void (*func)(JSONMessageParser *, QList *)) +{ + parser->emit = func; + parser->brace_count = 0; + parser->bracket_count = 0; + parser->tokens = qlist_new(); + parser->token_size = 0; + + json_lexer_init(&parser->lexer, json_message_process_token); +} + +int json_message_parser_feed(JSONMessageParser *parser, + const char *buffer, size_t size) +{ + return json_lexer_feed(&parser->lexer, buffer, size); +} + +int json_message_parser_flush(JSONMessageParser *parser) +{ + return json_lexer_flush(&parser->lexer); +} + +void json_message_parser_destroy(JSONMessageParser *parser) +{ + json_lexer_destroy(&parser->lexer); + QDECREF(parser->tokens); +} diff --git a/qobject/qbool.c b/qobject/qbool.c new file mode 100644 index 00000000..5ff69f0b --- /dev/null +++ b/qobject/qbool.c @@ -0,0 +1,68 @@ +/* + * QBool Module + * + * 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 "qapi/qmp/qbool.h" +#include "qapi/qmp/qobject.h" +#include "qemu-common.h" + +static void qbool_destroy_obj(QObject *obj); + +static const QType qbool_type = { + .code = QTYPE_QBOOL, + .destroy = qbool_destroy_obj, +}; + +/** + * qbool_from_bool(): Create a new QBool from a bool + * + * Return strong reference. + */ +QBool *qbool_from_bool(bool value) +{ + QBool *qb; + + qb = g_malloc(sizeof(*qb)); + qb->value = value; + QOBJECT_INIT(qb, &qbool_type); + + return qb; +} + +/** + * qbool_get_bool(): Get the stored bool + */ +bool qbool_get_bool(const QBool *qb) +{ + return qb->value; +} + +/** + * qobject_to_qbool(): Convert a QObject into a QBool + */ +QBool *qobject_to_qbool(const QObject *obj) +{ + if (qobject_type(obj) != QTYPE_QBOOL) + return NULL; + + return container_of(obj, QBool, base); +} + +/** + * qbool_destroy_obj(): Free all memory allocated by a + * QBool object + */ +static void qbool_destroy_obj(QObject *obj) +{ + assert(obj != NULL); + g_free(qobject_to_qbool(obj)); +} diff --git a/qobject/qdict.c b/qobject/qdict.c new file mode 100644 index 00000000..67b1a58a --- /dev/null +++ b/qobject/qdict.c @@ -0,0 +1,802 @@ +/* + * QDict Module + * + * Copyright (C) 2009 Red Hat Inc. + * + * Authors: + * Luiz Capitulino <lcapitulino@redhat.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 "qapi/qmp/qint.h" +#include "qapi/qmp/qfloat.h" +#include "qapi/qmp/qdict.h" +#include "qapi/qmp/qbool.h" +#include "qapi/qmp/qstring.h" +#include "qapi/qmp/qobject.h" +#include "qemu/queue.h" +#include "qemu-common.h" + +static void qdict_destroy_obj(QObject *obj); + +static const QType qdict_type = { + .code = QTYPE_QDICT, + .destroy = qdict_destroy_obj, +}; + +/** + * qdict_new(): Create a new QDict + * + * Return strong reference. + */ +QDict *qdict_new(void) +{ + QDict *qdict; + + qdict = g_malloc0(sizeof(*qdict)); + QOBJECT_INIT(qdict, &qdict_type); + + return qdict; +} + +/** + * qobject_to_qdict(): Convert a QObject into a QDict + */ +QDict *qobject_to_qdict(const QObject *obj) +{ + if (qobject_type(obj) != QTYPE_QDICT) + return NULL; + + return container_of(obj, QDict, base); +} + +/** + * tdb_hash(): based on the hash agorithm from gdbm, via tdb + * (from module-init-tools) + */ +static unsigned int tdb_hash(const char *name) +{ + unsigned value; /* Used to compute the hash value. */ + unsigned i; /* Used to cycle through random values. */ + + /* Set the initial value from the key size. */ + for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++) + value = (value + (((const unsigned char *)name)[i] << (i*5 % 24))); + + return (1103515243 * value + 12345); +} + +/** + * alloc_entry(): allocate a new QDictEntry + */ +static QDictEntry *alloc_entry(const char *key, QObject *value) +{ + QDictEntry *entry; + + entry = g_malloc0(sizeof(*entry)); + entry->key = g_strdup(key); + entry->value = value; + + return entry; +} + +/** + * qdict_entry_value(): Return qdict entry value + * + * Return weak reference. + */ +QObject *qdict_entry_value(const QDictEntry *entry) +{ + return entry->value; +} + +/** + * qdict_entry_key(): Return qdict entry key + * + * Return a *pointer* to the string, it has to be duplicated before being + * stored. + */ +const char *qdict_entry_key(const QDictEntry *entry) +{ + return entry->key; +} + +/** + * qdict_find(): List lookup function + */ +static QDictEntry *qdict_find(const QDict *qdict, + const char *key, unsigned int bucket) +{ + QDictEntry *entry; + + QLIST_FOREACH(entry, &qdict->table[bucket], next) + if (!strcmp(entry->key, key)) + return entry; + + return NULL; +} + +/** + * qdict_put_obj(): Put a new QObject into the dictionary + * + * Insert the pair 'key:value' into 'qdict', if 'key' already exists + * its 'value' will be replaced. + * + * This is done by freeing the reference to the stored QObject and + * storing the new one in the same entry. + * + * NOTE: ownership of 'value' is transferred to the QDict + */ +void qdict_put_obj(QDict *qdict, const char *key, QObject *value) +{ + unsigned int bucket; + QDictEntry *entry; + + bucket = tdb_hash(key) % QDICT_BUCKET_MAX; + entry = qdict_find(qdict, key, bucket); + if (entry) { + /* replace key's value */ + qobject_decref(entry->value); + entry->value = value; + } else { + /* allocate a new entry */ + entry = alloc_entry(key, value); + QLIST_INSERT_HEAD(&qdict->table[bucket], entry, next); + qdict->size++; + } +} + +/** + * qdict_get(): Lookup for a given 'key' + * + * Return a weak reference to the QObject associated with 'key' if + * 'key' is present in the dictionary, NULL otherwise. + */ +QObject *qdict_get(const QDict *qdict, const char *key) +{ + QDictEntry *entry; + + entry = qdict_find(qdict, key, tdb_hash(key) % QDICT_BUCKET_MAX); + return (entry == NULL ? NULL : entry->value); +} + +/** + * qdict_haskey(): Check if 'key' exists + * + * Return 1 if 'key' exists in the dict, 0 otherwise + */ +int qdict_haskey(const QDict *qdict, const char *key) +{ + unsigned int bucket = tdb_hash(key) % QDICT_BUCKET_MAX; + return (qdict_find(qdict, key, bucket) == NULL ? 0 : 1); +} + +/** + * qdict_size(): Return the size of the dictionary + */ +size_t qdict_size(const QDict *qdict) +{ + return qdict->size; +} + +/** + * qdict_get_obj(): Get a QObject of a specific type + */ +static QObject *qdict_get_obj(const QDict *qdict, const char *key, + qtype_code type) +{ + QObject *obj; + + obj = qdict_get(qdict, key); + assert(obj != NULL); + assert(qobject_type(obj) == type); + + return obj; +} + +/** + * qdict_get_double(): Get an number mapped by 'key' + * + * This function assumes that 'key' exists and it stores a + * QFloat or QInt object. + * + * Return number mapped by 'key'. + */ +double qdict_get_double(const QDict *qdict, const char *key) +{ + QObject *obj = qdict_get(qdict, key); + + assert(obj); + switch (qobject_type(obj)) { + case QTYPE_QFLOAT: + return qfloat_get_double(qobject_to_qfloat(obj)); + case QTYPE_QINT: + return qint_get_int(qobject_to_qint(obj)); + default: + abort(); + } +} + +/** + * qdict_get_int(): Get an integer mapped by 'key' + * + * This function assumes that 'key' exists and it stores a + * QInt object. + * + * Return integer mapped by 'key'. + */ +int64_t qdict_get_int(const QDict *qdict, const char *key) +{ + QObject *obj = qdict_get_obj(qdict, key, QTYPE_QINT); + return qint_get_int(qobject_to_qint(obj)); +} + +/** + * qdict_get_bool(): Get a bool mapped by 'key' + * + * This function assumes that 'key' exists and it stores a + * QBool object. + * + * Return bool mapped by 'key'. + */ +bool qdict_get_bool(const QDict *qdict, const char *key) +{ + QObject *obj = qdict_get_obj(qdict, key, QTYPE_QBOOL); + return qbool_get_bool(qobject_to_qbool(obj)); +} + +/** + * qdict_get_qlist(): Get the QList mapped by 'key' + * + * This function assumes that 'key' exists and it stores a + * QList object. + * + * Return QList mapped by 'key'. + */ +QList *qdict_get_qlist(const QDict *qdict, const char *key) +{ + return qobject_to_qlist(qdict_get_obj(qdict, key, QTYPE_QLIST)); +} + +/** + * qdict_get_qdict(): Get the QDict mapped by 'key' + * + * This function assumes that 'key' exists and it stores a + * QDict object. + * + * Return QDict mapped by 'key'. + */ +QDict *qdict_get_qdict(const QDict *qdict, const char *key) +{ + return qobject_to_qdict(qdict_get_obj(qdict, key, QTYPE_QDICT)); +} + +/** + * qdict_get_str(): Get a pointer to the stored string mapped + * by 'key' + * + * This function assumes that 'key' exists and it stores a + * QString object. + * + * Return pointer to the string mapped by 'key'. + */ +const char *qdict_get_str(const QDict *qdict, const char *key) +{ + QObject *obj = qdict_get_obj(qdict, key, QTYPE_QSTRING); + return qstring_get_str(qobject_to_qstring(obj)); +} + +/** + * qdict_get_try_int(): Try to get integer mapped by 'key' + * + * Return integer mapped by 'key', if it is not present in + * the dictionary or if the stored object is not of QInt type + * 'def_value' will be returned. + */ +int64_t qdict_get_try_int(const QDict *qdict, const char *key, + int64_t def_value) +{ + QObject *obj; + + obj = qdict_get(qdict, key); + if (!obj || qobject_type(obj) != QTYPE_QINT) + return def_value; + + return qint_get_int(qobject_to_qint(obj)); +} + +/** + * qdict_get_try_bool(): Try to get a bool mapped by 'key' + * + * Return bool mapped by 'key', if it is not present in the + * dictionary or if the stored object is not of QBool type + * 'def_value' will be returned. + */ +bool qdict_get_try_bool(const QDict *qdict, const char *key, bool def_value) +{ + QObject *obj; + + obj = qdict_get(qdict, key); + if (!obj || qobject_type(obj) != QTYPE_QBOOL) + return def_value; + + return qbool_get_bool(qobject_to_qbool(obj)); +} + +/** + * qdict_get_try_str(): Try to get a pointer to the stored string + * mapped by 'key' + * + * Return a pointer to the string mapped by 'key', if it is not present + * in the dictionary or if the stored object is not of QString type + * NULL will be returned. + */ +const char *qdict_get_try_str(const QDict *qdict, const char *key) +{ + QObject *obj; + + obj = qdict_get(qdict, key); + if (!obj || qobject_type(obj) != QTYPE_QSTRING) + return NULL; + + return qstring_get_str(qobject_to_qstring(obj)); +} + +/** + * qdict_iter(): Iterate over all the dictionary's stored values. + * + * This function allows the user to provide an iterator, which will be + * called for each stored value in the dictionary. + */ +void qdict_iter(const QDict *qdict, + void (*iter)(const char *key, QObject *obj, void *opaque), + void *opaque) +{ + int i; + QDictEntry *entry; + + for (i = 0; i < QDICT_BUCKET_MAX; i++) { + QLIST_FOREACH(entry, &qdict->table[i], next) + iter(entry->key, entry->value, opaque); + } +} + +static QDictEntry *qdict_next_entry(const QDict *qdict, int first_bucket) +{ + int i; + + for (i = first_bucket; i < QDICT_BUCKET_MAX; i++) { + if (!QLIST_EMPTY(&qdict->table[i])) { + return QLIST_FIRST(&qdict->table[i]); + } + } + + return NULL; +} + +/** + * qdict_first(): Return first qdict entry for iteration. + */ +const QDictEntry *qdict_first(const QDict *qdict) +{ + return qdict_next_entry(qdict, 0); +} + +/** + * qdict_next(): Return next qdict entry in an iteration. + */ +const QDictEntry *qdict_next(const QDict *qdict, const QDictEntry *entry) +{ + QDictEntry *ret; + + ret = QLIST_NEXT(entry, next); + if (!ret) { + unsigned int bucket = tdb_hash(entry->key) % QDICT_BUCKET_MAX; + ret = qdict_next_entry(qdict, bucket + 1); + } + + return ret; +} + +/** + * qdict_clone_shallow(): Clones a given QDict. Its entries are not copied, but + * another reference is added. + */ +QDict *qdict_clone_shallow(const QDict *src) +{ + QDict *dest; + QDictEntry *entry; + int i; + + dest = qdict_new(); + + for (i = 0; i < QDICT_BUCKET_MAX; i++) { + QLIST_FOREACH(entry, &src->table[i], next) { + qobject_incref(entry->value); + qdict_put_obj(dest, entry->key, entry->value); + } + } + + return dest; +} + +/** + * qentry_destroy(): Free all the memory allocated by a QDictEntry + */ +static void qentry_destroy(QDictEntry *e) +{ + assert(e != NULL); + assert(e->key != NULL); + assert(e->value != NULL); + + qobject_decref(e->value); + g_free(e->key); + g_free(e); +} + +/** + * qdict_del(): Delete a 'key:value' pair from the dictionary + * + * This will destroy all data allocated by this entry. + */ +void qdict_del(QDict *qdict, const char *key) +{ + QDictEntry *entry; + + entry = qdict_find(qdict, key, tdb_hash(key) % QDICT_BUCKET_MAX); + if (entry) { + QLIST_REMOVE(entry, next); + qentry_destroy(entry); + qdict->size--; + } +} + +/** + * qdict_destroy_obj(): Free all the memory allocated by a QDict + */ +static void qdict_destroy_obj(QObject *obj) +{ + int i; + QDict *qdict; + + assert(obj != NULL); + qdict = qobject_to_qdict(obj); + + for (i = 0; i < QDICT_BUCKET_MAX; i++) { + QDictEntry *entry = QLIST_FIRST(&qdict->table[i]); + while (entry) { + QDictEntry *tmp = QLIST_NEXT(entry, next); + QLIST_REMOVE(entry, next); + qentry_destroy(entry); + entry = tmp; + } + } + + g_free(qdict); +} + +/** + * qdict_copy_default(): If no entry mapped by 'key' exists in 'dst' yet, the + * value of 'key' in 'src' is copied there (and the refcount increased + * accordingly). + */ +void qdict_copy_default(QDict *dst, QDict *src, const char *key) +{ + QObject *val; + + if (qdict_haskey(dst, key)) { + return; + } + + val = qdict_get(src, key); + if (val) { + qobject_incref(val); + qdict_put_obj(dst, key, val); + } +} + +/** + * qdict_set_default_str(): If no entry mapped by 'key' exists in 'dst' yet, a + * new QString initialised by 'val' is put there. + */ +void qdict_set_default_str(QDict *dst, const char *key, const char *val) +{ + if (qdict_haskey(dst, key)) { + return; + } + + qdict_put(dst, key, qstring_from_str(val)); +} + +static void qdict_flatten_qdict(QDict *qdict, QDict *target, + const char *prefix); + +static void qdict_flatten_qlist(QList *qlist, QDict *target, const char *prefix) +{ + QObject *value; + const QListEntry *entry; + char *new_key; + int i; + + /* This function is never called with prefix == NULL, i.e., it is always + * called from within qdict_flatten_q(list|dict)(). Therefore, it does not + * need to remove list entries during the iteration (the whole list will be + * deleted eventually anyway from qdict_flatten_qdict()). */ + assert(prefix); + + entry = qlist_first(qlist); + + for (i = 0; entry; entry = qlist_next(entry), i++) { + value = qlist_entry_obj(entry); + new_key = g_strdup_printf("%s.%i", prefix, i); + + if (qobject_type(value) == QTYPE_QDICT) { + qdict_flatten_qdict(qobject_to_qdict(value), target, new_key); + } else if (qobject_type(value) == QTYPE_QLIST) { + qdict_flatten_qlist(qobject_to_qlist(value), target, new_key); + } else { + /* All other types are moved to the target unchanged. */ + qobject_incref(value); + qdict_put_obj(target, new_key, value); + } + + g_free(new_key); + } +} + +static void qdict_flatten_qdict(QDict *qdict, QDict *target, const char *prefix) +{ + QObject *value; + const QDictEntry *entry, *next; + char *new_key; + bool delete; + + entry = qdict_first(qdict); + + while (entry != NULL) { + + next = qdict_next(qdict, entry); + value = qdict_entry_value(entry); + new_key = NULL; + delete = false; + + if (prefix) { + new_key = g_strdup_printf("%s.%s", prefix, entry->key); + } + + if (qobject_type(value) == QTYPE_QDICT) { + /* Entries of QDicts are processed recursively, the QDict object + * itself disappears. */ + qdict_flatten_qdict(qobject_to_qdict(value), target, + new_key ? new_key : entry->key); + delete = true; + } else if (qobject_type(value) == QTYPE_QLIST) { + qdict_flatten_qlist(qobject_to_qlist(value), target, + new_key ? new_key : entry->key); + delete = true; + } else if (prefix) { + /* All other objects are moved to the target unchanged. */ + qobject_incref(value); + qdict_put_obj(target, new_key, value); + delete = true; + } + + g_free(new_key); + + if (delete) { + qdict_del(qdict, entry->key); + + /* Restart loop after modifying the iterated QDict */ + entry = qdict_first(qdict); + continue; + } + + entry = next; + } +} + +/** + * qdict_flatten(): For each nested QDict with key x, all fields with key y + * are moved to this QDict and their key is renamed to "x.y". For each nested + * QList with key x, the field at index y is moved to this QDict with the key + * "x.y" (i.e., the reverse of what qdict_array_split() does). + * This operation is applied recursively for nested QDicts and QLists. + */ +void qdict_flatten(QDict *qdict) +{ + qdict_flatten_qdict(qdict, qdict, NULL); +} + +/* extract all the src QDict entries starting by start into dst */ +void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start) + +{ + const QDictEntry *entry, *next; + const char *p; + + *dst = qdict_new(); + entry = qdict_first(src); + + while (entry != NULL) { + next = qdict_next(src, entry); + if (strstart(entry->key, start, &p)) { + qobject_incref(entry->value); + qdict_put_obj(*dst, p, entry->value); + qdict_del(src, entry->key); + } + entry = next; + } +} + +static int qdict_count_prefixed_entries(const QDict *src, const char *start) +{ + const QDictEntry *entry; + int count = 0; + + for (entry = qdict_first(src); entry; entry = qdict_next(src, entry)) { + if (strstart(entry->key, start, NULL)) { + if (count == INT_MAX) { + return -ERANGE; + } + count++; + } + } + + return count; +} + +/** + * qdict_array_split(): This function moves array-like elements of a QDict into + * a new QList. Every entry in the original QDict with a key "%u" or one + * prefixed "%u.", where %u designates an unsigned integer starting at 0 and + * incrementally counting up, will be moved to a new QDict at index %u in the + * output QList with the key prefix removed, if that prefix is "%u.". If the + * whole key is just "%u", the whole QObject will be moved unchanged without + * creating a new QDict. The function terminates when there is no entry in the + * QDict with a prefix directly (incrementally) following the last one; it also + * returns if there are both entries with "%u" and "%u." for the same index %u. + * Example: {"0.a": 42, "0.b": 23, "1.x": 0, "4.y": 1, "o.o": 7, "2": 66} + * (or {"1.x": 0, "4.y": 1, "0.a": 42, "o.o": 7, "0.b": 23, "2": 66}) + * => [{"a": 42, "b": 23}, {"x": 0}, 66] + * and {"4.y": 1, "o.o": 7} (remainder of the old QDict) + */ +void qdict_array_split(QDict *src, QList **dst) +{ + unsigned i; + + *dst = qlist_new(); + + for (i = 0; i < UINT_MAX; i++) { + QObject *subqobj; + bool is_subqdict; + QDict *subqdict; + char indexstr[32], prefix[32]; + size_t snprintf_ret; + + snprintf_ret = snprintf(indexstr, 32, "%u", i); + assert(snprintf_ret < 32); + + subqobj = qdict_get(src, indexstr); + + snprintf_ret = snprintf(prefix, 32, "%u.", i); + assert(snprintf_ret < 32); + + /* Overflow is the same as positive non-zero results */ + is_subqdict = qdict_count_prefixed_entries(src, prefix); + + // There may be either a single subordinate object (named "%u") or + // multiple objects (each with a key prefixed "%u."), but not both. + if (!subqobj == !is_subqdict) { + break; + } + + if (is_subqdict) { + qdict_extract_subqdict(src, &subqdict, prefix); + assert(qdict_size(subqdict) > 0); + } else { + qobject_incref(subqobj); + qdict_del(src, indexstr); + } + + qlist_append_obj(*dst, subqobj ?: QOBJECT(subqdict)); + } +} + +/** + * qdict_array_entries(): Returns the number of direct array entries if the + * sub-QDict of src specified by the prefix in subqdict (or src itself for + * prefix == "") is valid as an array, i.e. the length of the created list if + * the sub-QDict would become empty after calling qdict_array_split() on it. If + * the array is not valid, -EINVAL is returned. + */ +int qdict_array_entries(QDict *src, const char *subqdict) +{ + const QDictEntry *entry; + unsigned i; + unsigned entries = 0; + size_t subqdict_len = strlen(subqdict); + + assert(!subqdict_len || subqdict[subqdict_len - 1] == '.'); + + /* qdict_array_split() loops until UINT_MAX, but as we want to return + * negative errors, we only have a signed return value here. Any additional + * entries will lead to -EINVAL. */ + for (i = 0; i < INT_MAX; i++) { + QObject *subqobj; + int subqdict_entries; + size_t slen = 32 + subqdict_len; + char indexstr[slen], prefix[slen]; + size_t snprintf_ret; + + snprintf_ret = snprintf(indexstr, slen, "%s%u", subqdict, i); + assert(snprintf_ret < slen); + + subqobj = qdict_get(src, indexstr); + + snprintf_ret = snprintf(prefix, slen, "%s%u.", subqdict, i); + assert(snprintf_ret < slen); + + subqdict_entries = qdict_count_prefixed_entries(src, prefix); + if (subqdict_entries < 0) { + return subqdict_entries; + } + + /* There may be either a single subordinate object (named "%u") or + * multiple objects (each with a key prefixed "%u."), but not both. */ + if (subqobj && subqdict_entries) { + return -EINVAL; + } else if (!subqobj && !subqdict_entries) { + break; + } + + entries += subqdict_entries ? subqdict_entries : 1; + } + + /* Consider everything handled that isn't part of the given sub-QDict */ + for (entry = qdict_first(src); entry; entry = qdict_next(src, entry)) { + if (!strstart(qdict_entry_key(entry), subqdict, NULL)) { + entries++; + } + } + + /* Anything left in the sub-QDict that wasn't handled? */ + if (qdict_size(src) != entries) { + return -EINVAL; + } + + return i; +} + +/** + * qdict_join(): Absorb the src QDict into the dest QDict, that is, move all + * elements from src to dest. + * + * If an element from src has a key already present in dest, it will not be + * moved unless overwrite is true. + * + * If overwrite is true, the conflicting values in dest will be discarded and + * replaced by the corresponding values from src. + * + * Therefore, with overwrite being true, the src QDict will always be empty when + * this function returns. If overwrite is false, the src QDict will be empty + * iff there were no conflicts. + */ +void qdict_join(QDict *dest, QDict *src, bool overwrite) +{ + const QDictEntry *entry, *next; + + entry = qdict_first(src); + while (entry) { + next = qdict_next(src, entry); + + if (overwrite || !qdict_haskey(dest, entry->key)) { + qobject_incref(entry->value); + qdict_put_obj(dest, entry->key, entry->value); + qdict_del(src, entry->key); + } + + entry = next; + } +} diff --git a/qobject/qfloat.c b/qobject/qfloat.c new file mode 100644 index 00000000..7de0992d --- /dev/null +++ b/qobject/qfloat.c @@ -0,0 +1,68 @@ +/* + * QFloat Module + * + * 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 "qapi/qmp/qfloat.h" +#include "qapi/qmp/qobject.h" +#include "qemu-common.h" + +static void qfloat_destroy_obj(QObject *obj); + +static const QType qfloat_type = { + .code = QTYPE_QFLOAT, + .destroy = qfloat_destroy_obj, +}; + +/** + * qfloat_from_int(): Create a new QFloat from a float + * + * Return strong reference. + */ +QFloat *qfloat_from_double(double value) +{ + QFloat *qf; + + qf = g_malloc(sizeof(*qf)); + qf->value = value; + QOBJECT_INIT(qf, &qfloat_type); + + return qf; +} + +/** + * qfloat_get_double(): Get the stored float + */ +double qfloat_get_double(const QFloat *qf) +{ + return qf->value; +} + +/** + * qobject_to_qfloat(): Convert a QObject into a QFloat + */ +QFloat *qobject_to_qfloat(const QObject *obj) +{ + if (qobject_type(obj) != QTYPE_QFLOAT) + return NULL; + + return container_of(obj, QFloat, base); +} + +/** + * qfloat_destroy_obj(): Free all memory allocated by a + * QFloat object + */ +static void qfloat_destroy_obj(QObject *obj) +{ + assert(obj != NULL); + g_free(qobject_to_qfloat(obj)); +} diff --git a/qobject/qint.c b/qobject/qint.c new file mode 100644 index 00000000..86b9b04f --- /dev/null +++ b/qobject/qint.c @@ -0,0 +1,67 @@ +/* + * QInt Module + * + * Copyright (C) 2009 Red Hat Inc. + * + * Authors: + * Luiz Capitulino <lcapitulino@redhat.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 "qapi/qmp/qint.h" +#include "qapi/qmp/qobject.h" +#include "qemu-common.h" + +static void qint_destroy_obj(QObject *obj); + +static const QType qint_type = { + .code = QTYPE_QINT, + .destroy = qint_destroy_obj, +}; + +/** + * qint_from_int(): Create a new QInt from an int64_t + * + * Return strong reference. + */ +QInt *qint_from_int(int64_t value) +{ + QInt *qi; + + qi = g_malloc(sizeof(*qi)); + qi->value = value; + QOBJECT_INIT(qi, &qint_type); + + return qi; +} + +/** + * qint_get_int(): Get the stored integer + */ +int64_t qint_get_int(const QInt *qi) +{ + return qi->value; +} + +/** + * qobject_to_qint(): Convert a QObject into a QInt + */ +QInt *qobject_to_qint(const QObject *obj) +{ + if (qobject_type(obj) != QTYPE_QINT) + return NULL; + + return container_of(obj, QInt, base); +} + +/** + * qint_destroy_obj(): Free all memory allocated by a + * QInt object + */ +static void qint_destroy_obj(QObject *obj) +{ + assert(obj != NULL); + g_free(qobject_to_qint(obj)); +} diff --git a/qobject/qjson.c b/qobject/qjson.c new file mode 100644 index 00000000..33f8ef53 --- /dev/null +++ b/qobject/qjson.c @@ -0,0 +1,285 @@ +/* + * QObject JSON integration + * + * 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 "qapi/qmp/json-lexer.h" +#include "qapi/qmp/json-parser.h" +#include "qapi/qmp/json-streamer.h" +#include "qapi/qmp/qjson.h" +#include "qapi/qmp/qint.h" +#include "qapi/qmp/qlist.h" +#include "qapi/qmp/qbool.h" +#include "qapi/qmp/qfloat.h" +#include "qapi/qmp/qdict.h" + +typedef struct JSONParsingState +{ + JSONMessageParser parser; + va_list *ap; + QObject *result; +} JSONParsingState; + +static void parse_json(JSONMessageParser *parser, QList *tokens) +{ + JSONParsingState *s = container_of(parser, JSONParsingState, parser); + s->result = json_parser_parse(tokens, s->ap); +} + +QObject *qobject_from_jsonv(const char *string, va_list *ap) +{ + JSONParsingState state = {}; + + state.ap = ap; + + json_message_parser_init(&state.parser, parse_json); + json_message_parser_feed(&state.parser, string, strlen(string)); + json_message_parser_flush(&state.parser); + json_message_parser_destroy(&state.parser); + + return state.result; +} + +QObject *qobject_from_json(const char *string) +{ + return qobject_from_jsonv(string, NULL); +} + +/* + * IMPORTANT: This function aborts on error, thus it must not + * be used with untrusted arguments. + */ +QObject *qobject_from_jsonf(const char *string, ...) +{ + QObject *obj; + va_list ap; + + va_start(ap, string); + obj = qobject_from_jsonv(string, &ap); + va_end(ap); + + assert(obj != NULL); + return obj; +} + +typedef struct ToJsonIterState +{ + int indent; + int pretty; + int count; + QString *str; +} ToJsonIterState; + +static void to_json(const QObject *obj, QString *str, int pretty, int indent); + +static void to_json_dict_iter(const char *key, QObject *obj, void *opaque) +{ + ToJsonIterState *s = opaque; + QString *qkey; + int j; + + if (s->count) { + qstring_append(s->str, s->pretty ? "," : ", "); + } + + if (s->pretty) { + qstring_append(s->str, "\n"); + for (j = 0 ; j < s->indent ; j++) + qstring_append(s->str, " "); + } + + qkey = qstring_from_str(key); + to_json(QOBJECT(qkey), s->str, s->pretty, s->indent); + QDECREF(qkey); + + qstring_append(s->str, ": "); + to_json(obj, s->str, s->pretty, s->indent); + s->count++; +} + +static void to_json_list_iter(QObject *obj, void *opaque) +{ + ToJsonIterState *s = opaque; + int j; + + if (s->count) { + qstring_append(s->str, s->pretty ? "," : ", "); + } + + if (s->pretty) { + qstring_append(s->str, "\n"); + for (j = 0 ; j < s->indent ; j++) + qstring_append(s->str, " "); + } + + to_json(obj, s->str, s->pretty, s->indent); + s->count++; +} + +static void to_json(const QObject *obj, QString *str, int pretty, int indent) +{ + switch (qobject_type(obj)) { + case QTYPE_QNULL: + qstring_append(str, "null"); + break; + case QTYPE_QINT: { + QInt *val = qobject_to_qint(obj); + char buffer[1024]; + + snprintf(buffer, sizeof(buffer), "%" PRId64, qint_get_int(val)); + qstring_append(str, buffer); + break; + } + case QTYPE_QSTRING: { + QString *val = qobject_to_qstring(obj); + const char *ptr; + int cp; + char buf[16]; + char *end; + + ptr = qstring_get_str(val); + qstring_append(str, "\""); + + for (; *ptr; ptr = end) { + cp = mod_utf8_codepoint(ptr, 6, &end); + switch (cp) { + case '\"': + qstring_append(str, "\\\""); + break; + case '\\': + qstring_append(str, "\\\\"); + break; + case '\b': + qstring_append(str, "\\b"); + break; + case '\f': + qstring_append(str, "\\f"); + break; + case '\n': + qstring_append(str, "\\n"); + break; + case '\r': + qstring_append(str, "\\r"); + break; + case '\t': + qstring_append(str, "\\t"); + break; + default: + if (cp < 0) { + cp = 0xFFFD; /* replacement character */ + } + if (cp > 0xFFFF) { + /* beyond BMP; need a surrogate pair */ + snprintf(buf, sizeof(buf), "\\u%04X\\u%04X", + 0xD800 + ((cp - 0x10000) >> 10), + 0xDC00 + ((cp - 0x10000) & 0x3FF)); + } else if (cp < 0x20 || cp >= 0x7F) { + snprintf(buf, sizeof(buf), "\\u%04X", cp); + } else { + buf[0] = cp; + buf[1] = 0; + } + qstring_append(str, buf); + } + }; + + qstring_append(str, "\""); + break; + } + case QTYPE_QDICT: { + ToJsonIterState s; + QDict *val = qobject_to_qdict(obj); + + s.count = 0; + s.str = str; + s.indent = indent + 1; + s.pretty = pretty; + qstring_append(str, "{"); + qdict_iter(val, to_json_dict_iter, &s); + if (pretty) { + int j; + qstring_append(str, "\n"); + for (j = 0 ; j < indent ; j++) + qstring_append(str, " "); + } + qstring_append(str, "}"); + break; + } + case QTYPE_QLIST: { + ToJsonIterState s; + QList *val = qobject_to_qlist(obj); + + s.count = 0; + s.str = str; + s.indent = indent + 1; + s.pretty = pretty; + qstring_append(str, "["); + qlist_iter(val, (void *)to_json_list_iter, &s); + if (pretty) { + int j; + qstring_append(str, "\n"); + for (j = 0 ; j < indent ; j++) + qstring_append(str, " "); + } + qstring_append(str, "]"); + break; + } + case QTYPE_QFLOAT: { + QFloat *val = qobject_to_qfloat(obj); + char buffer[1024]; + int len; + + len = snprintf(buffer, sizeof(buffer), "%f", qfloat_get_double(val)); + while (len > 0 && buffer[len - 1] == '0') { + len--; + } + + if (len && buffer[len - 1] == '.') { + buffer[len - 1] = 0; + } else { + buffer[len] = 0; + } + + qstring_append(str, buffer); + break; + } + case QTYPE_QBOOL: { + QBool *val = qobject_to_qbool(obj); + + if (qbool_get_bool(val)) { + qstring_append(str, "true"); + } else { + qstring_append(str, "false"); + } + break; + } + default: + abort(); + } +} + +QString *qobject_to_json(const QObject *obj) +{ + QString *str = qstring_new(); + + to_json(obj, str, 0, 0); + + return str; +} + +QString *qobject_to_json_pretty(const QObject *obj) +{ + QString *str = qstring_new(); + + to_json(obj, str, 1, 0); + + return str; +} diff --git a/qobject/qlist.c b/qobject/qlist.c new file mode 100644 index 00000000..1ced0de5 --- /dev/null +++ b/qobject/qlist.c @@ -0,0 +1,170 @@ +/* + * QList Module + * + * Copyright (C) 2009 Red Hat Inc. + * + * Authors: + * Luiz Capitulino <lcapitulino@redhat.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 "qapi/qmp/qlist.h" +#include "qapi/qmp/qobject.h" +#include "qemu/queue.h" +#include "qemu-common.h" + +static void qlist_destroy_obj(QObject *obj); + +static const QType qlist_type = { + .code = QTYPE_QLIST, + .destroy = qlist_destroy_obj, +}; + +/** + * qlist_new(): Create a new QList + * + * Return strong reference. + */ +QList *qlist_new(void) +{ + QList *qlist; + + qlist = g_malloc(sizeof(*qlist)); + QTAILQ_INIT(&qlist->head); + QOBJECT_INIT(qlist, &qlist_type); + + return qlist; +} + +static void qlist_copy_elem(QObject *obj, void *opaque) +{ + QList *dst = opaque; + + qobject_incref(obj); + qlist_append_obj(dst, obj); +} + +QList *qlist_copy(QList *src) +{ + QList *dst = qlist_new(); + + qlist_iter(src, qlist_copy_elem, dst); + + return dst; +} + +/** + * qlist_append_obj(): Append an QObject into QList + * + * NOTE: ownership of 'value' is transferred to the QList + */ +void qlist_append_obj(QList *qlist, QObject *value) +{ + QListEntry *entry; + + entry = g_malloc(sizeof(*entry)); + entry->value = value; + + QTAILQ_INSERT_TAIL(&qlist->head, entry, next); +} + +/** + * qlist_iter(): Iterate over all the list's stored values. + * + * This function allows the user to provide an iterator, which will be + * called for each stored value in the list. + */ +void qlist_iter(const QList *qlist, + void (*iter)(QObject *obj, void *opaque), void *opaque) +{ + QListEntry *entry; + + QTAILQ_FOREACH(entry, &qlist->head, next) + iter(entry->value, opaque); +} + +QObject *qlist_pop(QList *qlist) +{ + QListEntry *entry; + QObject *ret; + + if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) { + return NULL; + } + + entry = QTAILQ_FIRST(&qlist->head); + QTAILQ_REMOVE(&qlist->head, entry, next); + + ret = entry->value; + g_free(entry); + + return ret; +} + +QObject *qlist_peek(QList *qlist) +{ + QListEntry *entry; + QObject *ret; + + if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) { + return NULL; + } + + entry = QTAILQ_FIRST(&qlist->head); + + ret = entry->value; + + return ret; +} + +int qlist_empty(const QList *qlist) +{ + return QTAILQ_EMPTY(&qlist->head); +} + +static void qlist_size_iter(QObject *obj, void *opaque) +{ + size_t *count = opaque; + (*count)++; +} + +size_t qlist_size(const QList *qlist) +{ + size_t count = 0; + qlist_iter(qlist, qlist_size_iter, &count); + return count; +} + +/** + * qobject_to_qlist(): Convert a QObject into a QList + */ +QList *qobject_to_qlist(const QObject *obj) +{ + if (qobject_type(obj) != QTYPE_QLIST) { + return NULL; + } + + return container_of(obj, QList, base); +} + +/** + * qlist_destroy_obj(): Free all the memory allocated by a QList + */ +static void qlist_destroy_obj(QObject *obj) +{ + QList *qlist; + QListEntry *entry, *next_entry; + + assert(obj != NULL); + qlist = qobject_to_qlist(obj); + + QTAILQ_FOREACH_SAFE(entry, &qlist->head, next, next_entry) { + QTAILQ_REMOVE(&qlist->head, entry, next); + qobject_decref(entry->value); + g_free(entry); + } + + g_free(qlist); +} diff --git a/qobject/qnull.c b/qobject/qnull.c new file mode 100644 index 00000000..9873e266 --- /dev/null +++ b/qobject/qnull.c @@ -0,0 +1,29 @@ +/* + * QNull + * + * Copyright (C) 2015 Red Hat, Inc. + * + * Authors: + * Markus Armbruster <armbru@redhat.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 "qemu-common.h" +#include "qapi/qmp/qobject.h" + +static void qnull_destroy_obj(QObject *obj) +{ + assert(0); +} + +static const QType qnull_type = { + .code = QTYPE_QNULL, + .destroy = qnull_destroy_obj, +}; + +QObject qnull_ = { + .type = &qnull_type, + .refcnt = 1, +}; diff --git a/qobject/qstring.c b/qobject/qstring.c new file mode 100644 index 00000000..607b7a14 --- /dev/null +++ b/qobject/qstring.c @@ -0,0 +1,149 @@ +/* + * QString Module + * + * Copyright (C) 2009 Red Hat Inc. + * + * Authors: + * Luiz Capitulino <lcapitulino@redhat.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 "qapi/qmp/qobject.h" +#include "qapi/qmp/qstring.h" +#include "qemu-common.h" + +static void qstring_destroy_obj(QObject *obj); + +static const QType qstring_type = { + .code = QTYPE_QSTRING, + .destroy = qstring_destroy_obj, +}; + +/** + * qstring_new(): Create a new empty QString + * + * Return strong reference. + */ +QString *qstring_new(void) +{ + return qstring_from_str(""); +} + +/** + * qstring_get_length(): Get the length of a QString + */ +size_t qstring_get_length(const QString *qstring) +{ + return qstring->length; +} + +/** + * qstring_from_substr(): Create a new QString from a C string substring + * + * Return string reference + */ +QString *qstring_from_substr(const char *str, int start, int end) +{ + QString *qstring; + + qstring = g_malloc(sizeof(*qstring)); + + qstring->length = end - start + 1; + qstring->capacity = qstring->length; + + qstring->string = g_malloc(qstring->capacity + 1); + memcpy(qstring->string, str + start, qstring->length); + qstring->string[qstring->length] = 0; + + QOBJECT_INIT(qstring, &qstring_type); + + return qstring; +} + +/** + * qstring_from_str(): Create a new QString from a regular C string + * + * Return strong reference. + */ +QString *qstring_from_str(const char *str) +{ + return qstring_from_substr(str, 0, strlen(str) - 1); +} + +static void capacity_increase(QString *qstring, size_t len) +{ + if (qstring->capacity < (qstring->length + len)) { + qstring->capacity += len; + qstring->capacity *= 2; /* use exponential growth */ + + qstring->string = g_realloc(qstring->string, qstring->capacity + 1); + } +} + +/* qstring_append(): Append a C string to a QString + */ +void qstring_append(QString *qstring, const char *str) +{ + size_t len = strlen(str); + + capacity_increase(qstring, len); + memcpy(qstring->string + qstring->length, str, len); + qstring->length += len; + qstring->string[qstring->length] = 0; +} + +void qstring_append_int(QString *qstring, int64_t value) +{ + char num[32]; + + snprintf(num, sizeof(num), "%" PRId64, value); + qstring_append(qstring, num); +} + +/** + * qstring_append_chr(): Append a C char to a QString + */ +void qstring_append_chr(QString *qstring, int c) +{ + capacity_increase(qstring, 1); + qstring->string[qstring->length++] = c; + qstring->string[qstring->length] = 0; +} + +/** + * qobject_to_qstring(): Convert a QObject to a QString + */ +QString *qobject_to_qstring(const QObject *obj) +{ + if (qobject_type(obj) != QTYPE_QSTRING) + return NULL; + + return container_of(obj, QString, base); +} + +/** + * qstring_get_str(): Return a pointer to the stored string + * + * NOTE: Should be used with caution, if the object is deallocated + * this pointer becomes invalid. + */ +const char *qstring_get_str(const QString *qstring) +{ + return qstring->string; +} + +/** + * qstring_destroy_obj(): Free all memory allocated by a QString + * object + */ +static void qstring_destroy_obj(QObject *obj) +{ + QString *qs; + + assert(obj != NULL); + qs = qobject_to_qstring(obj); + g_free(qs->string); + g_free(qs); +} |