mongoose/examples/dashboard/mjson.c

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2020-12-05 19:26:32 +08:00
// Copyright (c) 2018-2020 Cesanta Software Limited
// All rights reserved
//
// 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 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.
#include "mjson.h"
#if !defined(_MSC_VER) || _MSC_VER >= 1700
#else
#define va_copy(x, y) (x) = (y)
#define snprintf _snprintf
#define alloca _alloca
#endif
static int mjson_esc(int c, int esc) {
const char *p, *esc1 = "\b\f\n\r\t\\\"", *esc2 = "bfnrt\\\"";
for (p = esc ? esc1 : esc2; *p != '\0'; p++) {
if (*p == c) return esc ? esc2[p - esc1] : esc1[p - esc2];
}
return 0;
}
static int mjson_pass_string(const char *s, int len) {
int i;
for (i = 0; i < len; i++) {
if (s[i] == '\\' && i + 1 < len && mjson_esc(s[i + 1], 1)) {
i++;
} else if (s[i] == '\0') {
return MJSON_ERROR_INVALID_INPUT;
} else if (s[i] == '"') {
return i;
}
}
return MJSON_ERROR_INVALID_INPUT;
}
int mjson(const char *s, int len, mjson_cb_t cb, void *ud) {
enum { S_VALUE, S_KEY, S_COLON, S_COMMA_OR_EOO } expecting = S_VALUE;
unsigned char nesting[MJSON_MAX_DEPTH];
int i, depth = 0;
#define MJSONCALL(ev) \
if (cb != NULL && cb(ev, s, start, i - start + 1, ud)) return i + 1;
// In the ascii table, the distance between `[` and `]` is 2.
// Ditto for `{` and `}`. Hence +2 in the code below.
#define MJSONEOO() \
do { \
if (c != nesting[depth - 1] + 2) return MJSON_ERROR_INVALID_INPUT; \
depth--; \
if (depth == 0) { \
MJSONCALL(tok); \
return i + 1; \
} \
} while (0)
for (i = 0; i < len; i++) {
int start = i;
unsigned char c = ((unsigned char *) s)[i];
int tok = c;
if (c == ' ' || c == '\t' || c == '\n' || c == '\r') continue;
// printf("- %c [%.*s] %d %d\n", c, i, s, depth, expecting);
switch (expecting) {
case S_VALUE:
if (c == '{') {
if (depth >= (int) sizeof(nesting)) return MJSON_ERROR_TOO_DEEP;
nesting[depth++] = c;
expecting = S_KEY;
break;
} else if (c == '[') {
if (depth >= (int) sizeof(nesting)) return MJSON_ERROR_TOO_DEEP;
nesting[depth++] = c;
break;
} else if (c == ']' && depth > 0) { // Empty array
MJSONEOO();
} else if (c == 't' && i + 3 < len && memcmp(&s[i], "true", 4) == 0) {
i += 3;
tok = MJSON_TOK_TRUE;
} else if (c == 'n' && i + 3 < len && memcmp(&s[i], "null", 4) == 0) {
i += 3;
tok = MJSON_TOK_NULL;
} else if (c == 'f' && i + 4 < len && memcmp(&s[i], "false", 5) == 0) {
i += 4;
tok = MJSON_TOK_FALSE;
} else if (c == '-' || ((c >= '0' && c <= '9'))) {
char *end = NULL;
strtod(&s[i], &end);
if (end != NULL) i += end - &s[i] - 1;
tok = MJSON_TOK_NUMBER;
} else if (c == '"') {
int n = mjson_pass_string(&s[i + 1], len - i - 1);
if (n < 0) return n;
i += n + 1;
tok = MJSON_TOK_STRING;
} else {
return MJSON_ERROR_INVALID_INPUT;
}
if (depth == 0) {
MJSONCALL(tok);
return i + 1;
}
expecting = S_COMMA_OR_EOO;
break;
case S_KEY:
if (c == '"') {
int n = mjson_pass_string(&s[i + 1], len - i - 1);
if (n < 0) return n;
i += n + 1;
tok = MJSON_TOK_KEY;
expecting = S_COLON;
} else if (c == '}') { // Empty object
MJSONEOO();
expecting = S_COMMA_OR_EOO;
} else {
return MJSON_ERROR_INVALID_INPUT;
}
break;
case S_COLON:
if (c == ':') {
expecting = S_VALUE;
} else {
return MJSON_ERROR_INVALID_INPUT;
}
break;
case S_COMMA_OR_EOO:
if (depth <= 0) return MJSON_ERROR_INVALID_INPUT;
if (c == ',') {
expecting = (nesting[depth - 1] == '{') ? S_KEY : S_VALUE;
} else if (c == ']' || c == '}') {
MJSONEOO();
} else {
return MJSON_ERROR_INVALID_INPUT;
}
break;
}
MJSONCALL(tok);
}
return MJSON_ERROR_INVALID_INPUT;
}
struct msjon_get_data {
const char *path; // Lookup json path
int pos; // Current path index
int d1; // Current depth of traversal
int d2; // Expected depth of traversal
int i1; // Index in an array
int i2; // Expected index in an array
int obj; // If the value is array/object, offset where it starts
const char **tokptr; // Destination
int *toklen; // Destination length
int tok; // Returned token
};
static int mjson_plen(const char *s) {
int i = 0;
while (s[i] != '\0' && s[i] != '.' && s[i] != '[') i++;
return i;
}
static int mjson_get_cb(int tok, const char *s, int off, int len, void *ud) {
struct msjon_get_data *data = (struct msjon_get_data *) ud;
// printf("--> %2x %2d %2d %2d %2d\t'%s'\t'%.*s'\t\t'%.*s'\n", tok, data->d1,
// data->d2, data->i1, data->i2, data->path + data->pos, off, s, len,
// s + off);
if (data->tok != MJSON_TOK_INVALID) return 1; // Found
if (tok == '{') {
if (!data->path[data->pos] && data->d1 == data->d2) data->obj = off;
data->d1++;
} else if (tok == '[') {
if (data->d1 == data->d2 && data->path[data->pos] == '[') {
data->i1 = 0;
data->i2 = (int) strtod(&data->path[data->pos + 1], NULL);
if (data->i1 == data->i2) {
data->d2++;
data->pos += 3;
}
}
if (!data->path[data->pos] && data->d1 == data->d2) data->obj = off;
data->d1++;
} else if (tok == ',') {
if (data->d1 == data->d2 + 1) {
data->i1++;
if (data->i1 == data->i2) {
while (data->path[data->pos] != ']') data->pos++;
data->pos++;
data->d2++;
}
}
} else if (tok == MJSON_TOK_KEY && data->d1 == data->d2 + 1 &&
data->path[data->pos] == '.' && s[off] == '"' &&
s[off + len - 1] == '"' &&
mjson_plen(&data->path[data->pos + 1]) == len - 2 &&
!memcmp(s + off + 1, &data->path[data->pos + 1], len - 2)) {
data->d2++;
data->pos += len - 1;
} else if (tok == MJSON_TOK_KEY && data->d1 == data->d2) {
return 1; // Exhausted path, not found
} else if (tok == '}' || tok == ']') {
data->d1--;
// data->d2--;
if (!data->path[data->pos] && data->d1 == data->d2 && data->obj != -1) {
data->tok = tok - 2;
if (data->tokptr) *data->tokptr = s + data->obj;
if (data->toklen) *data->toklen = off - data->obj + 1;
return 1;
}
} else if (MJSON_TOK_IS_VALUE(tok)) {
// printf("TOK --> %d\n", tok);
if (data->d1 == data->d2 && !data->path[data->pos]) {
data->tok = tok;
if (data->tokptr) *data->tokptr = s + off;
if (data->toklen) *data->toklen = len;
return 1;
}
}
return 0;
}
enum mjson_tok mjson_find(const char *s, int len, const char *jp,
const char **tokptr, int *toklen) {
struct msjon_get_data data = {jp, 1, 0, 0, 0,
0, -1, tokptr, toklen, MJSON_TOK_INVALID};
if (jp[0] != '$') return MJSON_TOK_INVALID;
if (mjson(s, len, mjson_get_cb, &data) < 0) return MJSON_TOK_INVALID;
return (enum mjson_tok) data.tok;
}
int mjson_get_number(const char *s, int len, const char *path, double *v) {
const char *p;
int tok, n;
if ((tok = mjson_find(s, len, path, &p, &n)) == MJSON_TOK_NUMBER) {
if (v != NULL) *v = strtod(p, NULL);
}
return tok == MJSON_TOK_NUMBER ? 1 : 0;
}
int mjson_get_bool(const char *s, int len, const char *path, int *v) {
int tok = mjson_find(s, len, path, NULL, NULL);
if (tok == MJSON_TOK_TRUE && v != NULL) *v = 1;
if (tok == MJSON_TOK_FALSE && v != NULL) *v = 0;
return tok == MJSON_TOK_TRUE || tok == MJSON_TOK_FALSE ? 1 : 0;
}
static int mjson_unescape(const char *s, int len, char *to, int n) {
int i, j;
for (i = 0, j = 0; i < len && j < n; i++, j++) {
if (s[i] == '\\' && i + 1 < len) {
int c = mjson_esc(s[i + 1], 0);
if (c == 0) return -1;
to[j] = c;
i++;
} else {
to[j] = s[i];
}
}
if (j >= n) return -1;
if (n > 0) to[j] = '\0';
return j;
}
int mjson_get_string(const char *s, int len, const char *path, char *to,
int n) {
const char *p;
int sz;
if (mjson_find(s, len, path, &p, &sz) != MJSON_TOK_STRING) return -1;
return mjson_unescape(p + 1, sz - 2, to, n);
}
int mjson_get_hex(const char *s, int len, const char *x, char *to, int n) {
const char *p;
int i, j, sz;
if (mjson_find(s, len, x, &p, &sz) != MJSON_TOK_STRING) return -1;
for (i = j = 0; i < sz - 3 && j < n; i += 2, j++) {
#define HEXTOI(x) (x >= '0' && x <= '9' ? x - '0' : x - 'W')
unsigned char a = *(const unsigned char *) (p + i + 1);
unsigned char b = *(const unsigned char *) (p + i + 2);
((unsigned char *) to)[j] = (HEXTOI(a) << 4) | HEXTOI(b);
}
if (j < n) to[j] = '\0';
return j;
}
#if MJSON_ENABLE_BASE64
static int mjson_base64rev(int c) {
if (c >= 'A' && c <= 'Z') {
return c - 'A';
} else if (c >= 'a' && c <= 'z') {
return c + 26 - 'a';
} else if (c >= '0' && c <= '9') {
return c + 52 - '0';
} else if (c == '+') {
return 62;
} else if (c == '/') {
return 63;
} else {
return 64;
}
}
int mjson_base64_dec(const char *src, int n, char *dst, int dlen) {
const char *end = src + n;
int len = 0;
while (src + 3 < end && len < dlen) {
int a = mjson_base64rev(src[0]), b = mjson_base64rev(src[1]),
c = mjson_base64rev(src[2]), d = mjson_base64rev(src[3]);
dst[len++] = (a << 2) | (b >> 4);
if (src[2] != '=' && len < dlen) {
dst[len++] = (b << 4) | (c >> 2);
if (src[3] != '=' && len < dlen) {
dst[len++] = (c << 6) | d;
}
}
src += 4;
}
if (len < dlen) dst[len] = '\0';
return len;
}
int mjson_get_base64(const char *s, int len, const char *path, char *to,
int n) {
const char *p;
int sz;
if (mjson_find(s, len, path, &p, &sz) != MJSON_TOK_STRING) return 0;
return mjson_base64_dec(p + 1, sz - 2, to, n);
}
#endif // MJSON_ENABLE_BASE64
#if MJSON_ENABLE_NEXT
struct nextdata {
int off, len, depth, t, vo, arrayindex;
int *koff, *klen, *voff, *vlen, *vtype;
};
static int next_cb(int tok, const char *s, int off, int len, void *ud) {
struct nextdata *d = (struct nextdata *) ud;
// int i;
switch (tok) {
case '{':
case '[':
if (d->depth == 0 && tok == '[') d->arrayindex = 0;
if (d->depth == 1 && off > d->off) {
d->vo = off;
d->t = tok == '{' ? MJSON_TOK_OBJECT : MJSON_TOK_ARRAY;
if (d->voff) *d->voff = off;
if (d->vtype) *d->vtype = d->t;
}
d->depth++;
break;
case '}':
case ']':
d->depth--;
if (d->depth == 1 && d->vo) {
d->len = off + len;
if (d->vlen) *d->vlen = d->len - d->vo;
if (d->arrayindex >= 0) {
if (d->koff) *d->koff = d->arrayindex; // koff holds array index
if (d->klen) *d->klen = 0; // klen holds 0
}
return 1;
}
if (d->depth == 1 && d->arrayindex >= 0) d->arrayindex++;
break;
case ',':
case ':':
break;
case MJSON_TOK_KEY:
if (d->depth == 1 && d->off < off) {
if (d->koff) *d->koff = off; // And report back to the user
if (d->klen) *d->klen = len; // If we have to
}
break;
default:
if (d->depth != 1) break;
// If we're iterating over the array
if (off > d->off) {
d->len = off + len;
if (d->vlen) *d->vlen = len; // value length
if (d->voff) *d->voff = off; // value offset
if (d->vtype) *d->vtype = tok; // value type
if (d->arrayindex >= 0) {
if (d->koff) *d->koff = d->arrayindex; // koff holds array index
if (d->klen) *d->klen = 0; // klen holds 0
}
return 1;
}
if (d->arrayindex >= 0) d->arrayindex++;
break;
}
(void) s;
return 0;
}
int mjson_next(const char *s, int n, int off, int *koff, int *klen, int *voff,
int *vlen, int *vtype) {
struct nextdata d = {off, 0, 0, 0, 0, -1, koff, klen, voff, vlen, vtype};
mjson(s, n, next_cb, &d);
return d.len;
}
#endif
#if MJSON_ENABLE_PRINT
int mjson_print_fixed_buf(const char *ptr, int len, void *fndata) {
struct mjson_fixedbuf *fb = (struct mjson_fixedbuf *) fndata;
int i, left = fb->size - 1 - fb->len;
if (left < len) len = left;
for (i = 0; i < len; i++) fb->ptr[fb->len + i] = ptr[i];
fb->len += len;
fb->ptr[fb->len] = '\0';
return len;
}
int mjson_print_dynamic_buf(const char *ptr, int len, void *fndata) {
char *s, *buf = *(char **) fndata;
int curlen = buf == NULL ? 0 : strlen(buf);
if ((s = (char *) realloc(buf, curlen + len + 1)) == NULL) {
return 0;
} else {
memcpy(s + curlen, ptr, len);
s[curlen + len] = '\0';
*(char **) fndata = s;
return len;
}
}
int mjson_print_null(const char *ptr, int len, void *userdata) {
(void) ptr;
(void) userdata;
return len;
}
int mjson_print_file(const char *ptr, int len, void *userdata) {
return fwrite(ptr, 1, len, (FILE *) userdata);
}
int mjson_print_buf(mjson_print_fn_t fn, void *fndata, const char *buf,
int len) {
return fn(buf, len, fndata);
}
int mjson_print_int(mjson_print_fn_t fn, void *fndata, int value,
int is_signed) {
char buf[20];
int len = snprintf(buf, sizeof(buf), is_signed ? "%d" : "%u", value);
return fn(buf, len, fndata);
}
int mjson_print_long(mjson_print_fn_t fn, void *fndata, long value,
int is_signed) {
char buf[20];
const char *fmt = (is_signed ? "%ld" : "%lu");
int len = snprintf(buf, sizeof(buf), fmt, value);
return fn(buf, len, fndata);
}
int mjson_print_dbl(mjson_print_fn_t fn, void *fndata, double d,
const char *fmt) {
char buf[40];
int n = snprintf(buf, sizeof(buf), fmt, d);
return fn(buf, n, fndata);
}
int mjson_print_str(mjson_print_fn_t fn, void *fndata, const char *s, int len) {
int i, n = fn("\"", 1, fndata);
for (i = 0; i < len; i++) {
char c = mjson_esc(s[i], 1);
if (c) {
n += fn("\\", 1, fndata);
n += fn(&c, 1, fndata);
} else {
n += fn(&s[i], 1, fndata);
}
}
return n + fn("\"", 1, fndata);
}
#if MJSON_ENABLE_BASE64
int mjson_print_b64(mjson_print_fn_t fn, void *fndata, const unsigned char *s,
int n) {
const char *t =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int i, len = fn("\"", 1, fndata);
for (i = 0; i < n; i += 3) {
int a = s[i], b = i + 1 < n ? s[i + 1] : 0, c = i + 2 < n ? s[i + 2] : 0;
char buf[4] = {t[a >> 2], t[(a & 3) << 4 | (b >> 4)], '=', '='};
if (i + 1 < n) buf[2] = t[(b & 15) << 2 | (c >> 6)];
if (i + 2 < n) buf[3] = t[c & 63];
len += fn(buf, sizeof(buf), fndata);
}
return len + fn("\"", 1, fndata);
}
#endif /* MJSON_ENABLE_BASE64 */
int mjson_vprintf(mjson_print_fn_t fn, void *fndata, const char *fmt,
va_list xap) {
int i = 0, n = 0;
va_list ap;
va_copy(ap, xap);
while (fmt[i] != '\0') {
if (fmt[i] == '%') {
char fc = fmt[++i];
int is_long = 0;
if (fc == 'l') {
is_long = 1;
fc = fmt[i + 1];
}
if (fc == 'Q') {
char *buf = va_arg(ap, char *);
n += mjson_print_str(fn, fndata, buf ? buf : "", buf ? strlen(buf) : 0);
} else if (strncmp(&fmt[i], ".*Q", 3) == 0) {
int len = va_arg(ap, int);
char *buf = va_arg(ap, char *);
n += mjson_print_str(fn, fndata, buf, len);
i += 2;
} else if (fc == 'd' || fc == 'u') {
int is_signed = (fc == 'd');
if (is_long) {
long val = va_arg(ap, long);
n += mjson_print_long(fn, fndata, val, is_signed);
i++;
} else {
int val = va_arg(ap, int);
n += mjson_print_int(fn, fndata, val, is_signed);
}
} else if (fc == 'B') {
const char *s = va_arg(ap, int) ? "true" : "false";
n += mjson_print_buf(fn, fndata, s, strlen(s));
} else if (fc == 's') {
char *buf = va_arg(ap, char *);
n += mjson_print_buf(fn, fndata, buf, strlen(buf));
} else if (strncmp(&fmt[i], ".*s", 3) == 0) {
int len = va_arg(ap, int);
char *buf = va_arg(ap, char *);
n += mjson_print_buf(fn, fndata, buf, len);
i += 2;
} else if (fc == 'g') {
n += mjson_print_dbl(fn, fndata, va_arg(ap, double), "%g");
} else if (fc == 'f') {
n += mjson_print_dbl(fn, fndata, va_arg(ap, double), "%f");
#if MJSON_ENABLE_BASE64
} else if (fc == 'V') {
int len = va_arg(ap, int);
const char *buf = va_arg(ap, const char *);
n += mjson_print_b64(fn, fndata, (unsigned char *) buf, len);
#endif
} else if (fc == 'H') {
const char *hex = "0123456789abcdef";
int i, len = va_arg(ap, int);
const unsigned char *p = va_arg(ap, const unsigned char *);
n += fn("\"", 1, fndata);
for (i = 0; i < len; i++) {
n += fn(&hex[(p[i] >> 4) & 15], 1, fndata);
n += fn(&hex[p[i] & 15], 1, fndata);
}
n += fn("\"", 1, fndata);
} else if (fc == 'M') {
mjson_vprint_fn_t vfn = va_arg(ap, mjson_vprint_fn_t);
n += vfn(fn, fndata, &ap);
}
i++;
} else {
n += mjson_print_buf(fn, fndata, &fmt[i++], 1);
}
}
va_end(xap);
va_end(ap);
return n;
}
int mjson_printf(mjson_print_fn_t fn, void *fndata, const char *fmt, ...) {
va_list ap;
int len;
va_start(ap, fmt);
len = mjson_vprintf(fn, fndata, fmt, ap);
va_end(ap);
return len;
}
#endif /* MJSON_ENABLE_PRINT */
#if MJSON_IMPLEMENT_STRTOD
static inline int is_digit(int c) {
return c >= '0' && c <= '9';
}
/* NOTE: strtod() implementation by Yasuhiro Matsumoto. */
double strtod(const char *str, char **end) {
double d = 0.0;
int sign = 1, n = 0;
const char *p = str, *a = str;
/* decimal part */
if (*p == '-') {
sign = -1;
++p;
} else if (*p == '+')
++p;
if (is_digit(*p)) {
d = (double) (*p++ - '0');
while (*p && is_digit(*p)) {
d = d * 10.0 + (double) (*p - '0');
++p;
++n;
}
a = p;
} else if (*p != '.')
goto done;
d *= sign;
/* fraction part */
if (*p == '.') {
double f = 0.0;
double base = 0.1;
++p;
if (is_digit(*p)) {
while (*p && is_digit(*p)) {
f += base * (*p - '0');
base /= 10.0;
++p;
++n;
}
}
d += f * sign;
a = p;
}
/* exponential part */
if ((*p == 'E') || (*p == 'e')) {
int e = 0;
++p;
sign = 1;
if (*p == '-') {
sign = -1;
++p;
} else if (*p == '+')
++p;
if (is_digit(*p)) {
while (*p == '0') ++p;
e = (int) (*p++ - '0');
while (*p && is_digit(*p)) {
e = e * 10 + (int) (*p - '0');
++p;
}
e *= sign;
} else if (!is_digit(*(a - 1))) {
a = str;
goto done;
} else if (*p == 0)
goto done;
if (d == 2.2250738585072011 && e == -308) {
d = 0.0;
a = p;
goto done;
}
if (d == 2.2250738585072012 && e <= -308) {
d *= 1.0e-308;
a = p;
goto done;
}
{
int i;
for (i = 0; i < 10; i++) d *= 10;
}
a = p;
} else if (p > str && !is_digit(*(p - 1))) {
a = str;
goto done;
}
done:
if (end) *end = (char *) a;
return d;
}
#endif
#if MJSON_ENABLE_MERGE
int mjson_merge(const char *s, int n, const char *s2, int n2,
mjson_print_fn_t fn, void *userdata) {
int koff, klen, voff, vlen, t, t2, k, off = 0, len = 0, comma = 0;
if (n < 2) return len;
len += fn("{", 1, userdata);
while ((off = mjson_next(s, n, off, &koff, &klen, &voff, &vlen, &t)) != 0) {
#if !defined(_MSC_VER) || _MSC_VER >= 1700
char path[klen + 1];
#else
char *path = (char *) alloca(klen + 1);
#endif
const char *val;
memcpy(path, "$.", 2);
memcpy(path + 2, s + koff + 1, klen - 2);
path[klen] = '\0';
if ((t2 = mjson_find(s2, n2, path, &val, &k)) != MJSON_TOK_INVALID) {
if (t2 == MJSON_TOK_NULL) continue; // null deletes the key
} else {
val = s + voff; // Key is not found in the update. Copy the old value.
}
if (comma) len += fn(",", 1, userdata);
len += fn(s + koff, klen, userdata);
len += fn(":", 1, userdata);
if (t == MJSON_TOK_OBJECT && t2 == MJSON_TOK_OBJECT) {
len += mjson_merge(s + voff, vlen, val, k, fn, userdata);
} else {
if (t2 != MJSON_TOK_INVALID) vlen = k;
len += fn(val, vlen, userdata);
}
comma = 1;
}
// Add missing keys
off = 0;
while ((off = mjson_next(s2, n2, off, &koff, &klen, &voff, &vlen, &t)) != 0) {
#if !defined(_MSC_VER) || _MSC_VER >= 1700
char path[klen + 1];
#else
char *path = (char *) alloca(klen + 1);
#endif
const char *val;
if (t == MJSON_TOK_NULL) continue;
memcpy(path, "$.", 2);
memcpy(path + 2, s2 + koff + 1, klen - 2);
path[klen] = '\0';
if (mjson_find(s, n, path, &val, &vlen) != MJSON_TOK_INVALID) continue;
if (comma) len += fn(",", 1, userdata);
len += fn(s2 + koff, klen, userdata);
len += fn(":", 1, userdata);
len += fn(s2 + voff, vlen, userdata);
comma = 1;
}
len += fn("}", 1, userdata);
return len;
}
#endif // MJSON_ENABLE_MERGE
#if MJSON_ENABLE_PRETTY
struct prettydata {
int level;
int len;
int prev;
const char *pad;
int padlen;
mjson_print_fn_t fn;
void *userdata;
};
static int pretty_cb(int ev, const char *s, int off, int len, void *ud) {
struct prettydata *d = (struct prettydata *) ud;
int i;
switch (ev) {
case '{':
case '[':
d->level++;
d->len += d->fn(s + off, len, d->userdata);
break;
case '}':
case ']':
d->level--;
if (d->prev != '[' && d->prev != '{' && d->padlen > 0) {
d->len += d->fn("\n", 1, d->userdata);
for (i = 0; i < d->level; i++)
d->len += d->fn(d->pad, d->padlen, d->userdata);
}
d->len += d->fn(s + off, len, d->userdata);
break;
case ',':
d->len += d->fn(s + off, len, d->userdata);
if (d->padlen > 0) {
d->len += d->fn("\n", 1, d->userdata);
for (i = 0; i < d->level; i++)
d->len += d->fn(d->pad, d->padlen, d->userdata);
}
break;
case ':':
d->len += d->fn(s + off, len, d->userdata);
if (d->padlen > 0) d->len += d->fn(" ", 1, d->userdata);
break;
case MJSON_TOK_KEY:
if (d->prev == '{' && d->padlen > 0) {
d->len += d->fn("\n", 1, d->userdata);
for (i = 0; i < d->level; i++)
d->len += d->fn(d->pad, d->padlen, d->userdata);
}
d->len += d->fn(s + off, len, d->userdata);
break;
default:
if (d->prev == '[' && d->padlen > 0) {
d->len += d->fn("\n", 1, d->userdata);
for (i = 0; i < d->level; i++)
d->len += d->fn(d->pad, d->padlen, d->userdata);
}
d->len += d->fn(s + off, len, d->userdata);
break;
}
d->prev = ev;
return 0;
}
int mjson_pretty(const char *s, int n, const char *pad, mjson_print_fn_t fn,
void *userdata) {
struct prettydata d = {0, 0, 0, pad, strlen(pad), fn, userdata};
if (mjson(s, n, pretty_cb, &d) < 0) return -1;
return d.len;
}
#endif // MJSON_ENABLE_PRETTY
#if MJSON_ENABLE_RPC
struct jsonrpc_ctx jsonrpc_default_context;
struct jsonrpc_userdata {
mjson_print_fn_t fn;
void *fndata;
};
int mjson_globmatch(const char *s1, int n1, const char *s2, int n2) {
int i = 0, j = 0, ni = 0, nj = 0;
while (i < n1 || j < n2) {
if (i < n1 && j < n2 && (s1[i] == '?' || s2[j] == s1[i])) {
i++, j++;
} else if (i < n1 && (s1[i] == '*' || s1[i] == '#')) {
ni = i, nj = j + 1, i++;
} else if (nj > 0 && nj <= n2 && (s1[i - 1] == '#' || s2[j] != '/')) {
i = ni, j = nj;
} else {
return 0;
}
}
return 1;
}
static int jsonrpc_printer(const char *buf, int len, void *userdata) {
struct jsonrpc_userdata *u = (struct jsonrpc_userdata *) userdata;
return u->fn(buf, len, u->fndata);
}
void jsonrpc_return_errorv(struct jsonrpc_request *r, int code,
const char *message, const char *data_fmt,
va_list ap) {
if (r->id_len == 0) return;
mjson_printf(r->fn, r->fndata,
"{\"id\":%.*s,\"error\":{\"code\":%d,\"message\":%Q", r->id_len,
r->id, code, message == NULL ? "" : message);
if (data_fmt != NULL) {
mjson_printf(r->fn, r->fndata, ",\"data\":");
mjson_vprintf(r->fn, r->fndata, data_fmt, ap);
}
mjson_printf(r->fn, r->fndata, "}}\n");
}
void jsonrpc_return_error(struct jsonrpc_request *r, int code,
const char *message, const char *data_fmt, ...) {
va_list ap;
va_start(ap, data_fmt);
jsonrpc_return_errorv(r, code, message, data_fmt, ap);
va_end(ap);
}
void jsonrpc_return_successv(struct jsonrpc_request *r, const char *result_fmt,
va_list ap) {
if (r->id_len == 0) return;
mjson_printf(r->fn, r->fndata, "{\"id\":%.*s,\"result\":", r->id_len, r->id);
if (result_fmt != NULL) {
mjson_vprintf(r->fn, r->fndata, result_fmt, ap);
} else {
mjson_printf(r->fn, r->fndata, "%s", "null");
}
mjson_printf(r->fn, r->fndata, "}\n");
}
void jsonrpc_return_success(struct jsonrpc_request *r, const char *result_fmt,
...) {
va_list ap;
va_start(ap, result_fmt);
jsonrpc_return_successv(r, result_fmt, ap);
va_end(ap);
}
void jsonrpc_ctx_process(struct jsonrpc_ctx *ctx, const char *req, int req_sz,
mjson_print_fn_t fn, void *fndata) {
const char *result = NULL, *error = NULL;
int result_sz = 0, error_sz = 0;
struct jsonrpc_method *m = NULL;
struct jsonrpc_userdata d;
struct jsonrpc_request r = {req, req_sz, 0, 0, 0, 0, 0,
0, &jsonrpc_printer, NULL, NULL};
d.fn = fn;
d.fndata = fndata;
r.fndata = &d;
// Is is a response frame?
mjson_find(req, req_sz, "$.result", &result, &result_sz);
if (result == NULL) mjson_find(req, req_sz, "$.error", &error, &error_sz);
if (result_sz > 0 || error_sz > 0) {
if (ctx->response_cb != NULL) ctx->response_cb(req, req_sz, ctx->userdata);
return;
}
// Method must exist and must be a string
if (mjson_find(req, req_sz, "$.method", &r.method, &r.method_len) !=
MJSON_TOK_STRING) {
mjson_printf(fn, fndata, "{\"error\":{\"code\":-32700,\"message\":%.*Q}}\n",
req_sz, req);
ctx->in_len = 0;
return;
}
// id and params are optional
mjson_find(req, req_sz, "$.id", &r.id, &r.id_len);
mjson_find(req, req_sz, "$.params", &r.params, &r.params_len);
for (m = ctx->methods; m != NULL; m = m->next) {
if (mjson_globmatch(m->method, m->method_sz, r.method + 1,
r.method_len - 2) > 0) {
if (r.params == NULL) r.params = "";
r.userdata = m->cbdata;
m->cb(&r);
break;
}
}
if (m == NULL) {
jsonrpc_return_error(&r, JSONRPC_ERROR_NOT_FOUND, "method not found", NULL);
}
}
static int jsonrpc_print_methods(mjson_print_fn_t fn, void *fndata,
va_list *ap) {
struct jsonrpc_ctx *ctx = va_arg(*ap, struct jsonrpc_ctx *);
struct jsonrpc_method *m;
int len = 0;
for (m = ctx->methods; m != NULL; m = m->next) {
if (m != ctx->methods) len += mjson_print_buf(fn, fndata, ",", 1);
len += mjson_print_str(fn, fndata, m->method, strlen(m->method));
}
return len;
}
static void rpclist(struct jsonrpc_request *r) {
jsonrpc_return_success(r, "[%M]", jsonrpc_print_methods, r->userdata);
}
void jsonrpc_ctx_init(struct jsonrpc_ctx *ctx, mjson_print_fn_t response_cb,
void *userdata) {
ctx->response_cb = response_cb;
ctx->userdata = userdata;
jsonrpc_ctx_export(ctx, MJSON_RPC_LIST_NAME, rpclist, ctx);
}
void jsonrpc_ctx_process_byte(struct jsonrpc_ctx *ctx, unsigned char ch,
mjson_print_fn_t fn, void *p) {
if (ctx->in_len >= (int) sizeof(ctx->in)) ctx->in_len = 0; // Overflow
if (ch == '\n') { // If new line, parse frame
if (ctx->in_len > 1) jsonrpc_ctx_process(ctx, ctx->in, ctx->in_len, fn, p);
ctx->in_len = 0;
} else {
ctx->in[ctx->in_len] = ch; // Append to the buffer
ctx->in_len++;
}
}
void jsonrpc_init(mjson_print_fn_t response_cb, void *userdata) {
jsonrpc_ctx_init(&jsonrpc_default_context, response_cb, userdata);
}
#endif // MJSON_ENABLE_RPC