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-rw-r--r--src/libbasic/json.c871
1 files changed, 871 insertions, 0 deletions
diff --git a/src/libbasic/json.c b/src/libbasic/json.c
new file mode 100644
index 0000000000..daa98fc815
--- /dev/null
+++ b/src/libbasic/json.c
@@ -0,0 +1,871 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "alloc-util.h"
+#include "hexdecoct.h"
+#include "json.h"
+#include "macro.h"
+#include "string-util.h"
+#include "utf8.h"
+
+int json_variant_new(JsonVariant **ret, JsonVariantType type) {
+ JsonVariant *v;
+
+ v = new0(JsonVariant, 1);
+ if (!v)
+ return -ENOMEM;
+ v->type = type;
+ *ret = v;
+ return 0;
+}
+
+static int json_variant_deep_copy(JsonVariant *ret, JsonVariant *variant) {
+ int r;
+
+ assert(ret);
+ assert(variant);
+
+ ret->type = variant->type;
+ ret->size = variant->size;
+
+ if (variant->type == JSON_VARIANT_STRING) {
+ ret->string = memdup(variant->string, variant->size+1);
+ if (!ret->string)
+ return -ENOMEM;
+ } else if (variant->type == JSON_VARIANT_ARRAY || variant->type == JSON_VARIANT_OBJECT) {
+ size_t i;
+
+ ret->objects = new0(JsonVariant, variant->size);
+ if (!ret->objects)
+ return -ENOMEM;
+
+ for (i = 0; i < variant->size; ++i) {
+ r = json_variant_deep_copy(&ret->objects[i], &variant->objects[i]);
+ if (r < 0)
+ return r;
+ }
+ } else
+ ret->value = variant->value;
+
+ return 0;
+}
+
+static JsonVariant *json_object_unref(JsonVariant *variant);
+
+static JsonVariant *json_variant_unref_inner(JsonVariant *variant) {
+ if (!variant)
+ return NULL;
+
+ if (variant->type == JSON_VARIANT_ARRAY || variant->type == JSON_VARIANT_OBJECT)
+ return json_object_unref(variant);
+ else if (variant->type == JSON_VARIANT_STRING)
+ free(variant->string);
+
+ return NULL;
+}
+
+static JsonVariant *json_raw_unref(JsonVariant *variant, size_t size) {
+ if (!variant)
+ return NULL;
+
+ for (size_t i = 0; i < size; ++i)
+ json_variant_unref_inner(&variant[i]);
+
+ free(variant);
+ return NULL;
+}
+
+static JsonVariant *json_object_unref(JsonVariant *variant) {
+ size_t i;
+
+ assert(variant);
+
+ if (!variant->objects)
+ return NULL;
+
+ for (i = 0; i < variant->size; ++i)
+ json_variant_unref_inner(&variant->objects[i]);
+
+ free(variant->objects);
+ return NULL;
+}
+
+static JsonVariant **json_variant_array_unref(JsonVariant **variant) {
+ size_t i = 0;
+ JsonVariant *p = NULL;
+
+ if (!variant)
+ return NULL;
+
+ while((p = (variant[i++])) != NULL) {
+ if (p->type == JSON_VARIANT_STRING)
+ free(p->string);
+ free(p);
+ }
+
+ free(variant);
+
+ return NULL;
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(JsonVariant **, json_variant_array_unref);
+
+JsonVariant *json_variant_unref(JsonVariant *variant) {
+ if (!variant)
+ return NULL;
+
+ if (variant->type == JSON_VARIANT_ARRAY || variant->type == JSON_VARIANT_OBJECT)
+ json_object_unref(variant);
+ else if (variant->type == JSON_VARIANT_STRING)
+ free(variant->string);
+
+ free(variant);
+
+ return NULL;
+}
+
+char *json_variant_string(JsonVariant *variant){
+ assert(variant);
+ assert(variant->type == JSON_VARIANT_STRING);
+
+ return variant->string;
+}
+
+bool json_variant_bool(JsonVariant *variant) {
+ assert(variant);
+ assert(variant->type == JSON_VARIANT_BOOLEAN);
+
+ return variant->value.boolean;
+}
+
+intmax_t json_variant_integer(JsonVariant *variant) {
+ assert(variant);
+ assert(variant->type == JSON_VARIANT_INTEGER);
+
+ return variant->value.integer;
+}
+
+double json_variant_real(JsonVariant *variant) {
+ assert(variant);
+ assert(variant->type == JSON_VARIANT_REAL);
+
+ return variant->value.real;
+}
+
+JsonVariant *json_variant_element(JsonVariant *variant, unsigned index) {
+ assert(variant);
+ assert(variant->type == JSON_VARIANT_ARRAY || variant->type == JSON_VARIANT_OBJECT);
+ assert(index < variant->size);
+ assert(variant->objects);
+
+ return &variant->objects[index];
+}
+
+JsonVariant *json_variant_value(JsonVariant *variant, const char *key) {
+ size_t i;
+
+ assert(variant);
+ assert(variant->type == JSON_VARIANT_OBJECT);
+ assert(variant->objects);
+
+ for (i = 0; i < variant->size; i += 2) {
+ JsonVariant *p = &variant->objects[i];
+ if (p->type == JSON_VARIANT_STRING && streq(key, p->string))
+ return &variant->objects[i + 1];
+ }
+
+ return NULL;
+}
+
+static void inc_lines(unsigned *line, const char *s, size_t n) {
+ const char *p = s;
+
+ if (!line)
+ return;
+
+ for (;;) {
+ const char *f;
+
+ f = memchr(p, '\n', n);
+ if (!f)
+ return;
+
+ n -= (f - p) + 1;
+ p = f + 1;
+ (*line)++;
+ }
+}
+
+static int unhex_ucs2(const char *c, uint16_t *ret) {
+ int aa, bb, cc, dd;
+ uint16_t x;
+
+ assert(c);
+ assert(ret);
+
+ aa = unhexchar(c[0]);
+ if (aa < 0)
+ return -EINVAL;
+
+ bb = unhexchar(c[1]);
+ if (bb < 0)
+ return -EINVAL;
+
+ cc = unhexchar(c[2]);
+ if (cc < 0)
+ return -EINVAL;
+
+ dd = unhexchar(c[3]);
+ if (dd < 0)
+ return -EINVAL;
+
+ x = ((uint16_t) aa << 12) |
+ ((uint16_t) bb << 8) |
+ ((uint16_t) cc << 4) |
+ ((uint16_t) dd);
+
+ if (x <= 0)
+ return -EINVAL;
+
+ *ret = x;
+
+ return 0;
+}
+
+static int json_parse_string(const char **p, char **ret) {
+ _cleanup_free_ char *s = NULL;
+ size_t n = 0, allocated = 0;
+ const char *c;
+
+ assert(p);
+ assert(*p);
+ assert(ret);
+
+ c = *p;
+
+ if (*c != '"')
+ return -EINVAL;
+
+ c++;
+
+ for (;;) {
+ int len;
+
+ /* Check for EOF */
+ if (*c == 0)
+ return -EINVAL;
+
+ /* Check for control characters 0x00..0x1f */
+ if (*c > 0 && *c < ' ')
+ return -EINVAL;
+
+ /* Check for control character 0x7f */
+ if (*c == 0x7f)
+ return -EINVAL;
+
+ if (*c == '"') {
+ if (!s) {
+ s = strdup("");
+ if (!s)
+ return -ENOMEM;
+ } else
+ s[n] = 0;
+
+ *p = c + 1;
+
+ *ret = s;
+ s = NULL;
+ return JSON_STRING;
+ }
+
+ if (*c == '\\') {
+ char ch = 0;
+ c++;
+
+ if (*c == 0)
+ return -EINVAL;
+
+ if (IN_SET(*c, '"', '\\', '/'))
+ ch = *c;
+ else if (*c == 'b')
+ ch = '\b';
+ else if (*c == 'f')
+ ch = '\f';
+ else if (*c == 'n')
+ ch = '\n';
+ else if (*c == 'r')
+ ch = '\r';
+ else if (*c == 't')
+ ch = '\t';
+ else if (*c == 'u') {
+ char16_t x;
+ int r;
+
+ r = unhex_ucs2(c + 1, &x);
+ if (r < 0)
+ return r;
+
+ c += 5;
+
+ if (!GREEDY_REALLOC(s, allocated, n + 4))
+ return -ENOMEM;
+
+ if (!utf16_is_surrogate(x))
+ n += utf8_encode_unichar(s + n, (char32_t) x);
+ else if (utf16_is_trailing_surrogate(x))
+ return -EINVAL;
+ else {
+ char16_t y;
+
+ if (c[0] != '\\' || c[1] != 'u')
+ return -EINVAL;
+
+ r = unhex_ucs2(c + 2, &y);
+ if (r < 0)
+ return r;
+
+ c += 6;
+
+ if (!utf16_is_trailing_surrogate(y))
+ return -EINVAL;
+
+ n += utf8_encode_unichar(s + n, utf16_surrogate_pair_to_unichar(x, y));
+ }
+
+ continue;
+ } else
+ return -EINVAL;
+
+ if (!GREEDY_REALLOC(s, allocated, n + 2))
+ return -ENOMEM;
+
+ s[n++] = ch;
+ c ++;
+ continue;
+ }
+
+ len = utf8_encoded_valid_unichar(c);
+ if (len < 0)
+ return len;
+
+ if (!GREEDY_REALLOC(s, allocated, n + len + 1))
+ return -ENOMEM;
+
+ memcpy(s + n, c, len);
+ n += len;
+ c += len;
+ }
+}
+
+static int json_parse_number(const char **p, union json_value *ret) {
+ bool negative = false, exponent_negative = false, is_double = false;
+ double x = 0.0, y = 0.0, exponent = 0.0, shift = 1.0;
+ intmax_t i = 0;
+ const char *c;
+
+ assert(p);
+ assert(*p);
+ assert(ret);
+
+ c = *p;
+
+ if (*c == '-') {
+ negative = true;
+ c++;
+ }
+
+ if (*c == '0')
+ c++;
+ else {
+ if (!strchr("123456789", *c) || *c == 0)
+ return -EINVAL;
+
+ do {
+ if (!is_double) {
+ int64_t t;
+
+ t = 10 * i + (*c - '0');
+ if (t < i) /* overflow */
+ is_double = false;
+ else
+ i = t;
+ }
+
+ x = 10.0 * x + (*c - '0');
+ c++;
+ } while (strchr("0123456789", *c) && *c != 0);
+ }
+
+ if (*c == '.') {
+ is_double = true;
+ c++;
+
+ if (!strchr("0123456789", *c) || *c == 0)
+ return -EINVAL;
+
+ do {
+ y = 10.0 * y + (*c - '0');
+ shift = 10.0 * shift;
+ c++;
+ } while (strchr("0123456789", *c) && *c != 0);
+ }
+
+ if (*c == 'e' || *c == 'E') {
+ is_double = true;
+ c++;
+
+ if (*c == '-') {
+ exponent_negative = true;
+ c++;
+ } else if (*c == '+')
+ c++;
+
+ if (!strchr("0123456789", *c) || *c == 0)
+ return -EINVAL;
+
+ do {
+ exponent = 10.0 * exponent + (*c - '0');
+ c++;
+ } while (strchr("0123456789", *c) && *c != 0);
+ }
+
+ *p = c;
+
+ if (is_double) {
+ ret->real = ((negative ? -1.0 : 1.0) * (x + (y / shift))) * exp10((exponent_negative ? -1.0 : 1.0) * exponent);
+ return JSON_REAL;
+ } else {
+ ret->integer = negative ? -i : i;
+ return JSON_INTEGER;
+ }
+}
+
+int json_tokenize(
+ const char **p,
+ char **ret_string,
+ union json_value *ret_value,
+ void **state,
+ unsigned *line) {
+
+ const char *c;
+ int t;
+ int r;
+
+ enum {
+ STATE_NULL,
+ STATE_VALUE,
+ STATE_VALUE_POST,
+ };
+
+ assert(p);
+ assert(*p);
+ assert(ret_string);
+ assert(ret_value);
+ assert(state);
+
+ t = PTR_TO_INT(*state);
+ c = *p;
+
+ if (t == STATE_NULL) {
+ if (line)
+ *line = 1;
+ t = STATE_VALUE;
+ }
+
+ for (;;) {
+ const char *b;
+
+ b = c + strspn(c, WHITESPACE);
+ if (*b == 0)
+ return JSON_END;
+
+ inc_lines(line, c, b - c);
+ c = b;
+
+ switch (t) {
+
+ case STATE_VALUE:
+
+ if (*c == '{') {
+ *ret_string = NULL;
+ *ret_value = JSON_VALUE_NULL;
+ *p = c + 1;
+ *state = INT_TO_PTR(STATE_VALUE);
+ return JSON_OBJECT_OPEN;
+
+ } else if (*c == '}') {
+ *ret_string = NULL;
+ *ret_value = JSON_VALUE_NULL;
+ *p = c + 1;
+ *state = INT_TO_PTR(STATE_VALUE_POST);
+ return JSON_OBJECT_CLOSE;
+
+ } else if (*c == '[') {
+ *ret_string = NULL;
+ *ret_value = JSON_VALUE_NULL;
+ *p = c + 1;
+ *state = INT_TO_PTR(STATE_VALUE);
+ return JSON_ARRAY_OPEN;
+
+ } else if (*c == ']') {
+ *ret_string = NULL;
+ *ret_value = JSON_VALUE_NULL;
+ *p = c + 1;
+ *state = INT_TO_PTR(STATE_VALUE_POST);
+ return JSON_ARRAY_CLOSE;
+
+ } else if (*c == '"') {
+ r = json_parse_string(&c, ret_string);
+ if (r < 0)
+ return r;
+
+ *ret_value = JSON_VALUE_NULL;
+ *p = c;
+ *state = INT_TO_PTR(STATE_VALUE_POST);
+ return r;
+
+ } else if (strchr("-0123456789", *c)) {
+ r = json_parse_number(&c, ret_value);
+ if (r < 0)
+ return r;
+
+ *ret_string = NULL;
+ *p = c;
+ *state = INT_TO_PTR(STATE_VALUE_POST);
+ return r;
+
+ } else if (startswith(c, "true")) {
+ *ret_string = NULL;
+ ret_value->boolean = true;
+ *p = c + 4;
+ *state = INT_TO_PTR(STATE_VALUE_POST);
+ return JSON_BOOLEAN;
+
+ } else if (startswith(c, "false")) {
+ *ret_string = NULL;
+ ret_value->boolean = false;
+ *p = c + 5;
+ *state = INT_TO_PTR(STATE_VALUE_POST);
+ return JSON_BOOLEAN;
+
+ } else if (startswith(c, "null")) {
+ *ret_string = NULL;
+ *ret_value = JSON_VALUE_NULL;
+ *p = c + 4;
+ *state = INT_TO_PTR(STATE_VALUE_POST);
+ return JSON_NULL;
+
+ } else
+ return -EINVAL;
+
+ case STATE_VALUE_POST:
+
+ if (*c == ':') {
+ *ret_string = NULL;
+ *ret_value = JSON_VALUE_NULL;
+ *p = c + 1;
+ *state = INT_TO_PTR(STATE_VALUE);
+ return JSON_COLON;
+ } else if (*c == ',') {
+ *ret_string = NULL;
+ *ret_value = JSON_VALUE_NULL;
+ *p = c + 1;
+ *state = INT_TO_PTR(STATE_VALUE);
+ return JSON_COMMA;
+ } else if (*c == '}') {
+ *ret_string = NULL;
+ *ret_value = JSON_VALUE_NULL;
+ *p = c + 1;
+ *state = INT_TO_PTR(STATE_VALUE_POST);
+ return JSON_OBJECT_CLOSE;
+ } else if (*c == ']') {
+ *ret_string = NULL;
+ *ret_value = JSON_VALUE_NULL;
+ *p = c + 1;
+ *state = INT_TO_PTR(STATE_VALUE_POST);
+ return JSON_ARRAY_CLOSE;
+ } else
+ return -EINVAL;
+ }
+
+ }
+}
+
+static bool json_is_value(JsonVariant *var) {
+ assert(var);
+
+ return var->type != JSON_VARIANT_CONTROL;
+}
+
+static int json_scoped_parse(JsonVariant **tokens, size_t *i, size_t n, JsonVariant *scope) {
+ bool arr = scope->type == JSON_VARIANT_ARRAY;
+ int terminator = arr ? JSON_ARRAY_CLOSE : JSON_OBJECT_CLOSE;
+ size_t allocated = 0, size = 0;
+ JsonVariant *key = NULL, *value = NULL, *var = NULL, *items = NULL;
+ enum {
+ STATE_KEY,
+ STATE_COLON,
+ STATE_COMMA,
+ STATE_VALUE
+ } state = arr ? STATE_VALUE : STATE_KEY;
+
+ assert(tokens);
+ assert(i);
+ assert(scope);
+
+ while((var = *i < n ? tokens[(*i)++] : NULL) != NULL) {
+ bool stopper;
+ int r;
+
+ stopper = !json_is_value(var) && var->value.integer == terminator;
+
+ if (stopper) {
+ if (state != STATE_COMMA && size > 0)
+ goto error;
+
+ goto out;
+ }
+
+ if (state == STATE_KEY) {
+ if (var->type != JSON_VARIANT_STRING)
+ goto error;
+ else {
+ key = var;
+ state = STATE_COLON;
+ }
+ }
+ else if (state == STATE_COLON) {
+ if (key == NULL)
+ goto error;
+
+ if (json_is_value(var))
+ goto error;
+
+ if (var->value.integer != JSON_COLON)
+ goto error;
+
+ state = STATE_VALUE;
+ }
+ else if (state == STATE_VALUE) {
+ _cleanup_json_variant_unref_ JsonVariant *v = NULL;
+ size_t toadd = arr ? 1 : 2;
+
+ if (!json_is_value(var)) {
+ int type = (var->value.integer == JSON_ARRAY_OPEN) ? JSON_VARIANT_ARRAY : JSON_VARIANT_OBJECT;
+
+ r = json_variant_new(&v, type);
+ if (r < 0)
+ goto error;
+
+ r = json_scoped_parse(tokens, i, n, v);
+ if (r < 0)
+ goto error;
+
+ value = v;
+ }
+ else
+ value = var;
+
+ if(!GREEDY_REALLOC(items, allocated, size + toadd))
+ goto error;
+
+ if (arr) {
+ r = json_variant_deep_copy(&items[size], value);
+ if (r < 0)
+ goto error;
+ } else {
+ r = json_variant_deep_copy(&items[size], key);
+ if (r < 0)
+ goto error;
+
+ r = json_variant_deep_copy(&items[size+1], value);
+ if (r < 0)
+ goto error;
+ }
+
+ size += toadd;
+ state = STATE_COMMA;
+ }
+ else if (state == STATE_COMMA) {
+ if (json_is_value(var))
+ goto error;
+
+ if (var->value.integer != JSON_COMMA)
+ goto error;
+
+ key = NULL;
+ value = NULL;
+
+ state = arr ? STATE_VALUE : STATE_KEY;
+ }
+ }
+
+error:
+ json_raw_unref(items, size);
+ return -EBADMSG;
+
+out:
+ scope->size = size;
+ scope->objects = items;
+
+ return scope->type;
+}
+
+static int json_parse_tokens(JsonVariant **tokens, size_t ntokens, JsonVariant **rv) {
+ size_t it = 0;
+ int r;
+ JsonVariant *e;
+ _cleanup_json_variant_unref_ JsonVariant *p = NULL;
+
+ assert(tokens);
+ assert(ntokens);
+
+ e = tokens[it++];
+ r = json_variant_new(&p, JSON_VARIANT_OBJECT);
+ if (r < 0)
+ return r;
+
+ if (e->type != JSON_VARIANT_CONTROL && e->value.integer != JSON_OBJECT_OPEN)
+ return -EBADMSG;
+
+ r = json_scoped_parse(tokens, &it, ntokens, p);
+ if (r < 0)
+ return r;
+
+ *rv = p;
+ p = NULL;
+
+ return 0;
+}
+
+static int json_tokens(const char *string, size_t size, JsonVariant ***tokens, size_t *n) {
+ _cleanup_free_ char *buf = NULL;
+ _cleanup_(json_variant_array_unrefp) JsonVariant **items = NULL;
+ union json_value v = {};
+ void *json_state = NULL;
+ const char *p;
+ int t, r;
+ size_t allocated = 0, s = 0;
+
+ assert(string);
+ assert(n);
+
+ if (size <= 0)
+ return -EBADMSG;
+
+ buf = strndup(string, size);
+ if (!buf)
+ return -ENOMEM;
+
+ p = buf;
+ for (;;) {
+ _cleanup_json_variant_unref_ JsonVariant *var = NULL;
+ _cleanup_free_ char *rstr = NULL;
+
+ t = json_tokenize(&p, &rstr, &v, &json_state, NULL);
+
+ if (t < 0)
+ return t;
+ else if (t == JSON_END)
+ break;
+
+ if (t <= JSON_ARRAY_CLOSE) {
+ r = json_variant_new(&var, JSON_VARIANT_CONTROL);
+ if (r < 0)
+ return r;
+ var->value.integer = t;
+ } else {
+ switch (t) {
+ case JSON_STRING:
+ r = json_variant_new(&var, JSON_VARIANT_STRING);
+ if (r < 0)
+ return r;
+ var->size = strlen(rstr);
+ var->string = strdup(rstr);
+ if (!var->string) {
+ return -ENOMEM;
+ }
+ break;
+ case JSON_INTEGER:
+ r = json_variant_new(&var, JSON_VARIANT_INTEGER);
+ if (r < 0)
+ return r;
+ var->value = v;
+ break;
+ case JSON_REAL:
+ r = json_variant_new(&var, JSON_VARIANT_REAL);
+ if (r < 0)
+ return r;
+ var->value = v;
+ break;
+ case JSON_BOOLEAN:
+ r = json_variant_new(&var, JSON_VARIANT_BOOLEAN);
+ if (r < 0)
+ return r;
+ var->value = v;
+ break;
+ case JSON_NULL:
+ r = json_variant_new(&var, JSON_VARIANT_NULL);
+ if (r < 0)
+ return r;
+ break;
+ }
+ }
+
+ if (!GREEDY_REALLOC(items, allocated, s+2))
+ return -ENOMEM;
+
+ items[s++] = var;
+ items[s] = NULL;
+ var = NULL;
+ }
+
+ *n = s;
+ *tokens = items;
+ items = NULL;
+
+ return 0;
+}
+
+int json_parse(const char *string, JsonVariant **rv) {
+ _cleanup_(json_variant_array_unrefp) JsonVariant **s = NULL;
+ JsonVariant *v = NULL;
+ size_t n = 0;
+ int r;
+
+ assert(string);
+ assert(rv);
+
+ r = json_tokens(string, strlen(string), &s, &n);
+ if (r < 0)
+ return r;
+
+ r = json_parse_tokens(s, n, &v);
+ if (r < 0)
+ return r;
+
+ *rv = v;
+ return 0;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-14 03:33:30 +0000