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-rw-r--r--third_party/pipewire/spa/utils/json.h483
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diff --git a/third_party/pipewire/spa/utils/json.h b/third_party/pipewire/spa/utils/json.h
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+/* Simple Plugin API
+ *
+ * Copyright © 2020 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef SPA_UTILS_JSON_H
+#define SPA_UTILS_JSON_H
+
+#ifdef __cplusplus
+extern "C" {
+#else
+#include <stdbool.h>
+#endif
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <math.h>
+#include <float.h>
+
+#include <spa/utils/defs.h>
+#include <spa/utils/string.h>
+
+/** \defgroup spa_json JSON
+ * Relaxed JSON variant parsing
+ */
+
+/**
+ * \addtogroup spa_json
+ * \{
+ */
+
+/* a simple JSON compatible tokenizer */
+struct spa_json {
+ const char *cur;
+ const char *end;
+ struct spa_json *parent;
+ uint32_t state;
+ uint32_t depth;
+};
+
+#define SPA_JSON_INIT(data,size) (struct spa_json) { (data), (data)+(size), }
+
+static inline void spa_json_init(struct spa_json * iter, const char *data, size_t size)
+{
+ *iter = SPA_JSON_INIT(data, size);
+}
+#define SPA_JSON_ENTER(iter) (struct spa_json) { (iter)->cur, (iter)->end, (iter), }
+
+static inline void spa_json_enter(struct spa_json * iter, struct spa_json * sub)
+{
+ *sub = SPA_JSON_ENTER(iter);
+}
+
+#define SPA_JSON_SAVE(iter) (struct spa_json) { (iter)->cur, (iter)->end, }
+
+/** Get the next token. \a value points to the token and the return value
+ * is the length. */
+static inline int spa_json_next(struct spa_json * iter, const char **value)
+{
+ int utf8_remain = 0;
+ enum { __NONE, __STRUCT, __BARE, __STRING, __UTF8, __ESC, __COMMENT };
+
+ *value = iter->cur;
+ for (; iter->cur < iter->end; iter->cur++) {
+ unsigned char cur = (unsigned char)*iter->cur;
+ again:
+ switch (iter->state) {
+ case __NONE:
+ iter->state = __STRUCT;
+ iter->depth = 0;
+ goto again;
+ case __STRUCT:
+ switch (cur) {
+ case '\0': case '\t': case ' ': case '\r': case '\n': case ':': case '=': case ',':
+ continue;
+ case '#':
+ iter->state = __COMMENT;
+ continue;
+ case '"':
+ *value = iter->cur;
+ iter->state = __STRING;
+ continue;
+ case '[': case '{':
+ *value = iter->cur;
+ if (++iter->depth > 1)
+ continue;
+ iter->cur++;
+ return 1;
+ case '}': case ']':
+ if (iter->depth == 0) {
+ if (iter->parent)
+ iter->parent->cur = iter->cur;
+ return 0;
+ }
+ --iter->depth;
+ continue;
+ default:
+ *value = iter->cur;
+ iter->state = __BARE;
+ }
+ continue;
+ case __BARE:
+ switch (cur) {
+ case '\t': case ' ': case '\r': case '\n':
+ case ':': case ',': case '=': case ']': case '}':
+ iter->state = __STRUCT;
+ if (iter->depth > 0)
+ goto again;
+ return iter->cur - *value;
+ }
+ continue;
+ case __STRING:
+ switch (cur) {
+ case '\\':
+ iter->state = __ESC;
+ continue;
+ case '"':
+ iter->state = __STRUCT;
+ if (iter->depth > 0)
+ continue;
+ return ++iter->cur - *value;
+ case 240 ... 247:
+ utf8_remain++;
+ SPA_FALLTHROUGH;
+ case 224 ... 239:
+ utf8_remain++;
+ SPA_FALLTHROUGH;
+ case 192 ... 223:
+ utf8_remain++;
+ iter->state = __UTF8;
+ continue;
+ default:
+ if (cur >= 32 && cur <= 126)
+ continue;
+ }
+ return -1;
+ case __UTF8:
+ switch (cur) {
+ case 128 ... 191:
+ if (--utf8_remain == 0)
+ iter->state = __STRING;
+ continue;
+ }
+ return -1;
+ case __ESC:
+ switch (cur) {
+ case '"': case '\\': case '/': case 'b': case 'f':
+ case 'n': case 'r': case 't': case 'u':
+ iter->state = __STRING;
+ continue;
+ }
+ return -1;
+ case __COMMENT:
+ switch (cur) {
+ case '\n': case '\r':
+ iter->state = __STRUCT;
+ }
+ }
+
+ }
+ if (iter->depth != 0)
+ return -1;
+ if (iter->state != __STRUCT) {
+ iter->state = __STRUCT;
+ return iter->cur - *value;
+ }
+ return 0;
+}
+
+static inline int spa_json_enter_container(struct spa_json *iter, struct spa_json *sub, char type)
+{
+ const char *value;
+ if (spa_json_next(iter, &value) <= 0 || *value != type)
+ return -1;
+ spa_json_enter(iter, sub);
+ return 1;
+}
+
+static inline int spa_json_is_container(const char *val, int len)
+{
+ return len > 0 && (*val == '{' || *val == '[');
+}
+
+static inline int spa_json_container_len(struct spa_json *iter, const char *value, int len)
+{
+ const char *val;
+ struct spa_json sub;
+ spa_json_enter(iter, &sub);
+ while (spa_json_next(&sub, &val) > 0);
+ return sub.cur + 1 - value;
+}
+
+/* object */
+static inline int spa_json_is_object(const char *val, int len)
+{
+ return len > 0 && *val == '{';
+}
+static inline int spa_json_enter_object(struct spa_json *iter, struct spa_json *sub)
+{
+ return spa_json_enter_container(iter, sub, '{');
+}
+
+/* array */
+static inline bool spa_json_is_array(const char *val, int len)
+{
+ return len > 0 && *val == '[';
+}
+static inline int spa_json_enter_array(struct spa_json *iter, struct spa_json *sub)
+{
+ return spa_json_enter_container(iter, sub, '[');
+}
+
+/* null */
+static inline bool spa_json_is_null(const char *val, int len)
+{
+ return len == 4 && strncmp(val, "null", 4) == 0;
+}
+
+/* float */
+static inline int spa_json_parse_float(const char *val, int len, float *result)
+{
+ char *end;
+ *result = spa_strtof(val, &end);
+ return len > 0 && end == val + len;
+}
+
+static inline bool spa_json_is_float(const char *val, int len)
+{
+ float dummy;
+ return spa_json_parse_float(val, len, &dummy);
+}
+static inline int spa_json_get_float(struct spa_json *iter, float *res)
+{
+ const char *value;
+ int len;
+ if ((len = spa_json_next(iter, &value)) <= 0)
+ return -1;
+ return spa_json_parse_float(value, len, res);
+}
+
+static inline char *spa_json_format_float(char *str, int size, float val)
+{
+ if (SPA_UNLIKELY(!isnormal(val))) {
+ if (val == INFINITY)
+ val = FLT_MAX;
+ else if (val == -INFINITY)
+ val = FLT_MIN;
+ else
+ val = 0.0f;
+ }
+ return spa_dtoa(str, size, val);
+}
+
+/* int */
+static inline int spa_json_parse_int(const char *val, int len, int *result)
+{
+ char *end;
+ *result = strtol(val, &end, 0);
+ return len > 0 && end == val + len;
+}
+static inline bool spa_json_is_int(const char *val, int len)
+{
+ int dummy;
+ return spa_json_parse_int(val, len, &dummy);
+}
+static inline int spa_json_get_int(struct spa_json *iter, int *res)
+{
+ const char *value;
+ int len;
+ if ((len = spa_json_next(iter, &value)) <= 0)
+ return -1;
+ return spa_json_parse_int(value, len, res);
+}
+
+/* bool */
+static inline bool spa_json_is_true(const char *val, int len)
+{
+ return len == 4 && strncmp(val, "true", 4) == 0;
+}
+
+static inline bool spa_json_is_false(const char *val, int len)
+{
+ return len == 5 && strncmp(val, "false", 5) == 0;
+}
+
+static inline bool spa_json_is_bool(const char *val, int len)
+{
+ return spa_json_is_true(val, len) || spa_json_is_false(val, len);
+}
+
+static inline int spa_json_parse_bool(const char *val, int len, bool *result)
+{
+ if ((*result = spa_json_is_true(val, len)))
+ return 1;
+ if (!(*result = !spa_json_is_false(val, len)))
+ return 1;
+ return -1;
+}
+static inline int spa_json_get_bool(struct spa_json *iter, bool *res)
+{
+ const char *value;
+ int len;
+ if ((len = spa_json_next(iter, &value)) <= 0)
+ return -1;
+ return spa_json_parse_bool(value, len, res);
+}
+
+/* string */
+static inline bool spa_json_is_string(const char *val, int len)
+{
+ return len > 1 && *val == '"';
+}
+
+static inline int spa_json_parse_hex(const char *p, int num, uint32_t *res)
+{
+ int i;
+ *res = 0;
+ for (i = 0; i < num; i++) {
+ char v = p[i];
+ if (v >= '0' && v <= '9')
+ v = v - '0';
+ else if (v >= 'a' && v <= 'f')
+ v = v - 'a' + 10;
+ else if (v >= 'A' && v <= 'F')
+ v = v - 'A' + 10;
+ else
+ return -1;
+ *res = (*res << 4) | v;
+ }
+ return 1;
+}
+
+static inline int spa_json_parse_stringn(const char *val, int len, char *result, int maxlen)
+{
+ const char *p;
+ if (maxlen <= len)
+ return -1;
+ if (!spa_json_is_string(val, len)) {
+ if (result != val)
+ strncpy(result, val, len);
+ result += len;
+ } else {
+ for (p = val+1; p < val + len; p++) {
+ if (*p == '\\') {
+ p++;
+ if (*p == 'n')
+ *result++ = '\n';
+ else if (*p == 'r')
+ *result++ = '\r';
+ else if (*p == 'b')
+ *result++ = '\b';
+ else if (*p == 't')
+ *result++ = '\t';
+ else if (*p == 'f')
+ *result++ = '\f';
+ else if (*p == 'u') {
+ uint8_t prefix[] = { 0, 0xc0, 0xe0, 0xf0 };
+ uint32_t idx, n, v, cp, enc[] = { 0x80, 0x800, 0x10000 };
+ if (val + len - p < 5 ||
+ spa_json_parse_hex(p+1, 4, &cp) < 0) {
+ *result++ = *p;
+ continue;
+ }
+ p += 4;
+
+ if (cp >= 0xd800 && cp <= 0xdbff) {
+ if (val + len - p < 7 ||
+ p[1] != '\\' || p[2] != 'u' ||
+ spa_json_parse_hex(p+3, 4, &v) < 0 ||
+ v < 0xdc00 || v > 0xdfff)
+ continue;
+ p += 6;
+ cp = 0x010000 | ((cp & 0x3ff) << 10) | (v & 0x3ff);
+ } else if (cp >= 0xdc00 && cp <= 0xdfff)
+ continue;
+
+ for (idx = 0; idx < 3; idx++)
+ if (cp < enc[idx])
+ break;
+ for (n = idx; n > 0; n--, cp >>= 6)
+ result[n] = (cp | 0x80) & 0xbf;
+ *result++ = (cp | prefix[idx]) & 0xff;
+ result += idx;
+ } else
+ *result++ = *p;
+ } else if (*p == '\"') {
+ break;
+ } else
+ *result++ = *p;
+ }
+ }
+ *result = '\0';
+ return 1;
+}
+
+static inline int spa_json_parse_string(const char *val, int len, char *result)
+{
+ return spa_json_parse_stringn(val, len, result, len+1);
+}
+
+static inline int spa_json_get_string(struct spa_json *iter, char *res, int maxlen)
+{
+ const char *value;
+ int len;
+ if ((len = spa_json_next(iter, &value)) <= 0)
+ return -1;
+ return spa_json_parse_stringn(value, len, res, maxlen);
+}
+
+static inline int spa_json_encode_string(char *str, int size, const char *val)
+{
+ int len = 0;
+ static const char hex[] = { "0123456789abcdef" };
+#define __PUT(c) { if (len < size) *str++ = c; len++; }
+ __PUT('"');
+ while (*val) {
+ switch (*val) {
+ case '\n':
+ __PUT('\\'); __PUT('n');
+ break;
+ case '\r':
+ __PUT('\\'); __PUT('r');
+ break;
+ case '\b':
+ __PUT('\\'); __PUT('b');
+ break;
+ case '\t':
+ __PUT('\\'); __PUT('t');
+ break;
+ case '\f':
+ __PUT('\\'); __PUT('f');
+ break;
+ case '\\':
+ case '"':
+ __PUT('\\'); __PUT(*val);
+ break;
+ default:
+ if (*val > 0 && *val < 0x20) {
+ __PUT('\\'); __PUT('u');
+ __PUT('0'); __PUT('0');
+ __PUT(hex[((*val)>>4)&0xf]); __PUT(hex[(*val)&0xf]);
+ } else {
+ __PUT(*val);
+ }
+ break;
+ }
+ val++;
+ }
+ __PUT('"');
+ __PUT('\0');
+#undef __PUT
+ return len-1;
+}
+
+/**
+ * \}
+ */
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* SPA_UTILS_JSON_H */
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