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protobuf/upb/json/decode.c

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// Protocol Buffers - Google's data interchange format
// Copyright 2023 Google LLC. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#include "upb/json/decode.h"
#include <errno.h>
#include <float.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <setjmp.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "upb/base/descriptor_constants.h"
#include "upb/base/status.h"
#include "upb/base/string_view.h"
#include "upb/lex/atoi.h"
#include "upb/lex/unicode.h"
#include "upb/mem/arena.h"
#include "upb/message/array.h"
#include "upb/message/map.h"
#include "upb/message/message.h"
#include "upb/mini_table/message.h"
#include "upb/reflection/def.h"
#include "upb/reflection/message.h"
#include "upb/wire/encode.h"
// Must be last.
#include "upb/port/def.inc"
typedef struct {
const char *ptr, *end;
upb_Arena* arena; /* TODO: should we have a tmp arena for tmp data? */
const upb_DefPool* symtab;
int depth;
upb_Status* status;
jmp_buf err;
int line;
const char* line_begin;
bool is_first;
int options;
const upb_FieldDef* debug_field;
} jsondec;
typedef struct {
upb_MessageValue value;
bool ignore;
} upb_JsonMessageValue;
enum { JD_OBJECT, JD_ARRAY, JD_STRING, JD_NUMBER, JD_TRUE, JD_FALSE, JD_NULL };
/* Forward declarations of mutually-recursive functions. */
static void jsondec_wellknown(jsondec* d, upb_Message* msg,
const upb_MessageDef* m);
static upb_JsonMessageValue jsondec_value(jsondec* d, const upb_FieldDef* f);
static void jsondec_wellknownvalue(jsondec* d, upb_Message* msg,
const upb_MessageDef* m);
static void jsondec_object(jsondec* d, upb_Message* msg,
const upb_MessageDef* m);
static bool jsondec_streql(upb_StringView str, const char* lit) {
return str.size == strlen(lit) && memcmp(str.data, lit, str.size) == 0;
}
static bool jsondec_isnullvalue(const upb_FieldDef* f) {
return upb_FieldDef_CType(f) == kUpb_CType_Enum &&
strcmp(upb_EnumDef_FullName(upb_FieldDef_EnumSubDef(f)),
"google.protobuf.NullValue") == 0;
}
static bool jsondec_isvalue(const upb_FieldDef* f) {
return (upb_FieldDef_CType(f) == kUpb_CType_Message &&
upb_MessageDef_WellKnownType(upb_FieldDef_MessageSubDef(f)) ==
kUpb_WellKnown_Value) ||
jsondec_isnullvalue(f);
}
static void jsondec_seterrmsg(jsondec* d, const char* msg) {
upb_Status_SetErrorFormat(d->status, "Error parsing JSON @%d:%d: %s", d->line,
(int)(d->ptr - d->line_begin), msg);
}
UPB_NORETURN static void jsondec_err(jsondec* d, const char* msg) {
jsondec_seterrmsg(d, msg);
UPB_LONGJMP(d->err, 1);
}
UPB_PRINTF(2, 3)
UPB_NORETURN static void jsondec_errf(jsondec* d, const char* fmt, ...) {
va_list argp;
upb_Status_SetErrorFormat(d->status, "Error parsing JSON @%d:%d: ", d->line,
(int)(d->ptr - d->line_begin));
va_start(argp, fmt);
upb_Status_VAppendErrorFormat(d->status, fmt, argp);
va_end(argp);
UPB_LONGJMP(d->err, 1);
}
// Advances d->ptr until the next non-whitespace character or to the end of
// the buffer.
static void jsondec_consumews(jsondec* d) {
while (d->ptr != d->end) {
switch (*d->ptr) {
case '\n':
d->line++;
d->line_begin = d->ptr;
/* Fallthrough. */
case '\r':
case '\t':
case ' ':
d->ptr++;
break;
default:
return;
}
}
}
// Advances d->ptr until the next non-whitespace character. Postcondition that
// d->ptr is pointing at a valid non-whitespace character (will err if end of
// buffer is reached).
static void jsondec_skipws(jsondec* d) {
jsondec_consumews(d);
if (d->ptr == d->end) {
jsondec_err(d, "Unexpected EOF");
}
}
static bool jsondec_tryparsech(jsondec* d, char ch) {
if (d->ptr == d->end || *d->ptr != ch) return false;
d->ptr++;
return true;
}
static void jsondec_parselit(jsondec* d, const char* lit) {
size_t avail = d->end - d->ptr;
size_t len = strlen(lit);
if (avail < len || memcmp(d->ptr, lit, len) != 0) {
jsondec_errf(d, "Expected: '%s'", lit);
}
d->ptr += len;
}
static void jsondec_wsch(jsondec* d, char ch) {
jsondec_skipws(d);
if (!jsondec_tryparsech(d, ch)) {
jsondec_errf(d, "Expected: '%c'", ch);
}
}
static void jsondec_true(jsondec* d) { jsondec_parselit(d, "true"); }
static void jsondec_false(jsondec* d) { jsondec_parselit(d, "false"); }
static void jsondec_null(jsondec* d) { jsondec_parselit(d, "null"); }
static void jsondec_entrysep(jsondec* d) {
jsondec_skipws(d);
jsondec_parselit(d, ":");
}
static int jsondec_rawpeek(jsondec* d) {
if (d->ptr == d->end) {
jsondec_err(d, "Unexpected EOF");
}
switch (*d->ptr) {
case '{':
return JD_OBJECT;
case '[':
return JD_ARRAY;
case '"':
return JD_STRING;
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return JD_NUMBER;
case 't':
return JD_TRUE;
case 'f':
return JD_FALSE;
case 'n':
return JD_NULL;
default:
jsondec_errf(d, "Unexpected character: '%c'", *d->ptr);
}
}
/* JSON object/array **********************************************************/
/* These are used like so:
*
* jsondec_objstart(d);
* while (jsondec_objnext(d)) {
* ...
* }
* jsondec_objend(d) */
static int jsondec_peek(jsondec* d) {
jsondec_skipws(d);
return jsondec_rawpeek(d);
}
static void jsondec_push(jsondec* d) {
if (--d->depth < 0) {
jsondec_err(d, "Recursion limit exceeded");
}
d->is_first = true;
}
static bool jsondec_seqnext(jsondec* d, char end_ch) {
bool is_first = d->is_first;
d->is_first = false;
jsondec_skipws(d);
if (*d->ptr == end_ch) return false;
if (!is_first) jsondec_parselit(d, ",");
return true;
}
static void jsondec_arrstart(jsondec* d) {
jsondec_push(d);
jsondec_wsch(d, '[');
}
static void jsondec_arrend(jsondec* d) {
d->depth++;
jsondec_wsch(d, ']');
}
static bool jsondec_arrnext(jsondec* d) { return jsondec_seqnext(d, ']'); }
static void jsondec_objstart(jsondec* d) {
jsondec_push(d);
jsondec_wsch(d, '{');
}
static void jsondec_objend(jsondec* d) {
d->depth++;
jsondec_wsch(d, '}');
}
static bool jsondec_objnext(jsondec* d) {
if (!jsondec_seqnext(d, '}')) return false;
if (jsondec_peek(d) != JD_STRING) {
jsondec_err(d, "Object must start with string");
}
return true;
}
/* JSON number ****************************************************************/
static bool jsondec_tryskipdigits(jsondec* d) {
const char* start = d->ptr;
while (d->ptr < d->end) {
if (*d->ptr < '0' || *d->ptr > '9') {
break;
}
d->ptr++;
}
return d->ptr != start;
}
static void jsondec_skipdigits(jsondec* d) {
if (!jsondec_tryskipdigits(d)) {
jsondec_err(d, "Expected one or more digits");
}
}
static double jsondec_number(jsondec* d) {
const char* start = d->ptr;
UPB_ASSERT(jsondec_rawpeek(d) == JD_NUMBER);
/* Skip over the syntax of a number, as specified by JSON. */
if (*d->ptr == '-') d->ptr++;
if (jsondec_tryparsech(d, '0')) {
if (jsondec_tryskipdigits(d)) {
jsondec_err(d, "number cannot have leading zero");
}
} else {
jsondec_skipdigits(d);
}
if (d->ptr == d->end) goto parse;
if (jsondec_tryparsech(d, '.')) {
jsondec_skipdigits(d);
}
if (d->ptr == d->end) goto parse;
if (*d->ptr == 'e' || *d->ptr == 'E') {
d->ptr++;
if (d->ptr == d->end) {
jsondec_err(d, "Unexpected EOF in number");
}
if (*d->ptr == '+' || *d->ptr == '-') {
d->ptr++;
}
jsondec_skipdigits(d);
}
parse:
/* Having verified the syntax of a JSON number, use strtod() to parse
* (strtod() accepts a superset of JSON syntax). */
errno = 0;
{
// Copy the number into a null-terminated scratch buffer since strtod
// expects a null-terminated string.
char nullz[64];
ptrdiff_t len = d->ptr - start;
if (len > (ptrdiff_t)(sizeof(nullz) - 1)) {
jsondec_err(d, "excessively long number");
}
memcpy(nullz, start, len);
nullz[len] = '\0';
char* end;
double val = strtod(nullz, &end);
UPB_ASSERT(end - nullz == len);
/* Currently the min/max-val conformance tests fail if we check this. Does
* this mean the conformance tests are wrong or strtod() is wrong, or
* something else? Investigate further. */
/*
if (errno == ERANGE) {
jsondec_err(d, "Number out of range");
}
*/
if (val > DBL_MAX || val < -DBL_MAX) {
jsondec_err(d, "Number out of range");
}
return val;
}
}
/* JSON string ****************************************************************/
static char jsondec_escape(jsondec* d) {
switch (*d->ptr++) {
case '"':
return '\"';
case '\\':
return '\\';
case '/':
return '/';
case 'b':
return '\b';
case 'f':
return '\f';
case 'n':
return '\n';
case 'r':
return '\r';
case 't':
return '\t';
default:
jsondec_err(d, "Invalid escape char");
}
}
static uint32_t jsondec_codepoint(jsondec* d) {
uint32_t cp = 0;
const char* end;
if (d->end - d->ptr < 4) {
jsondec_err(d, "EOF inside string");
}
end = d->ptr + 4;
while (d->ptr < end) {
char ch = *d->ptr++;
if (ch >= '0' && ch <= '9') {
ch -= '0';
} else if (ch >= 'a' && ch <= 'f') {
ch = ch - 'a' + 10;
} else if (ch >= 'A' && ch <= 'F') {
ch = ch - 'A' + 10;
} else {
jsondec_err(d, "Invalid hex digit");
}
cp = (cp << 4) | ch;
}
return cp;
}
/* Parses a \uXXXX unicode escape (possibly a surrogate pair). */
static size_t jsondec_unicode(jsondec* d, char* out) {
uint32_t cp = jsondec_codepoint(d);
if (upb_Unicode_IsHigh(cp)) {
/* Surrogate pair: two 16-bit codepoints become a 32-bit codepoint. */
jsondec_parselit(d, "\\u");
uint32_t low = jsondec_codepoint(d);
if (!upb_Unicode_IsLow(low)) jsondec_err(d, "Invalid low surrogate");
cp = upb_Unicode_FromPair(cp, low);
} else if (upb_Unicode_IsLow(cp)) {
jsondec_err(d, "Unpaired low surrogate");
}
/* Write to UTF-8 */
int bytes = upb_Unicode_ToUTF8(cp, out);
if (bytes == 0) jsondec_err(d, "Invalid codepoint");
return bytes;
}
static void jsondec_resize(jsondec* d, char** buf, char** end, char** buf_end) {
size_t oldsize = *buf_end - *buf;
size_t len = *end - *buf;
size_t size = UPB_MAX(8, 2 * oldsize);
*buf = upb_Arena_Realloc(d->arena, *buf, len, size);
if (!*buf) jsondec_err(d, "Out of memory");
*end = *buf + len;
*buf_end = *buf + size;
}
static upb_StringView jsondec_string(jsondec* d) {
char* buf = NULL;
char* end = NULL;
char* buf_end = NULL;
jsondec_skipws(d);
if (*d->ptr++ != '"') {
jsondec_err(d, "Expected string");
}
while (d->ptr < d->end) {
char ch = *d->ptr++;
if (end == buf_end) {
jsondec_resize(d, &buf, &end, &buf_end);
}
switch (ch) {
case '"': {
upb_StringView ret;
ret.data = buf;
ret.size = end - buf;
*end = '\0'; /* Needed for possible strtod(). */
return ret;
}
case '\\':
if (d->ptr == d->end) goto eof;
if (*d->ptr == 'u') {
d->ptr++;
if (buf_end - end < 4) {
/* Allow space for maximum-sized codepoint (4 bytes). */
jsondec_resize(d, &buf, &end, &buf_end);
}
end += jsondec_unicode(d, end);
} else {
*end++ = jsondec_escape(d);
}
break;
default:
if ((unsigned char)ch < 0x20) {
jsondec_err(d, "Invalid char in JSON string");
}
*end++ = ch;
break;
}
}
eof:
jsondec_err(d, "EOF inside string");
}
static void jsondec_skipval(jsondec* d) {
switch (jsondec_peek(d)) {
case JD_OBJECT:
jsondec_objstart(d);
while (jsondec_objnext(d)) {
jsondec_string(d);
jsondec_entrysep(d);
jsondec_skipval(d);
}
jsondec_objend(d);
break;
case JD_ARRAY:
jsondec_arrstart(d);
while (jsondec_arrnext(d)) {
jsondec_skipval(d);
}
jsondec_arrend(d);
break;
case JD_TRUE:
jsondec_true(d);
break;
case JD_FALSE:
jsondec_false(d);
break;
case JD_NULL:
jsondec_null(d);
break;
case JD_STRING:
jsondec_string(d);
break;
case JD_NUMBER:
jsondec_number(d);
break;
}
}
/* Base64 decoding for bytes fields. ******************************************/
static unsigned int jsondec_base64_tablelookup(const char ch) {
/* Table includes the normal base64 chars plus the URL-safe variant. */
const signed char table[256] = {
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, 62 /*+*/, -1, 62 /*-*/, -1, 63 /*/ */, 52 /*0*/,
53 /*1*/, 54 /*2*/, 55 /*3*/, 56 /*4*/, 57 /*5*/, 58 /*6*/, 59 /*7*/,
60 /*8*/, 61 /*9*/, -1, -1, -1, -1, -1,
-1, -1, 0 /*A*/, 1 /*B*/, 2 /*C*/, 3 /*D*/, 4 /*E*/,
5 /*F*/, 6 /*G*/, 07 /*H*/, 8 /*I*/, 9 /*J*/, 10 /*K*/, 11 /*L*/,
12 /*M*/, 13 /*N*/, 14 /*O*/, 15 /*P*/, 16 /*Q*/, 17 /*R*/, 18 /*S*/,
19 /*T*/, 20 /*U*/, 21 /*V*/, 22 /*W*/, 23 /*X*/, 24 /*Y*/, 25 /*Z*/,
-1, -1, -1, -1, 63 /*_*/, -1, 26 /*a*/,
27 /*b*/, 28 /*c*/, 29 /*d*/, 30 /*e*/, 31 /*f*/, 32 /*g*/, 33 /*h*/,
34 /*i*/, 35 /*j*/, 36 /*k*/, 37 /*l*/, 38 /*m*/, 39 /*n*/, 40 /*o*/,
41 /*p*/, 42 /*q*/, 43 /*r*/, 44 /*s*/, 45 /*t*/, 46 /*u*/, 47 /*v*/,
48 /*w*/, 49 /*x*/, 50 /*y*/, 51 /*z*/, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1};
/* Sign-extend return value so high bit will be set on any unexpected char. */
return table[(unsigned)ch];
}
static char* jsondec_partialbase64(jsondec* d, const char* ptr, const char* end,
char* out) {
int32_t val = -1;
switch (end - ptr) {
case 2:
val = jsondec_base64_tablelookup(ptr[0]) << 18 |
jsondec_base64_tablelookup(ptr[1]) << 12;
out[0] = val >> 16;
out += 1;
break;
case 3:
val = jsondec_base64_tablelookup(ptr[0]) << 18 |
jsondec_base64_tablelookup(ptr[1]) << 12 |
jsondec_base64_tablelookup(ptr[2]) << 6;
out[0] = val >> 16;
out[1] = (val >> 8) & 0xff;
out += 2;
break;
}
if (val < 0) {
jsondec_err(d, "Corrupt base64");
}
return out;
}
static size_t jsondec_base64(jsondec* d, upb_StringView str) {
/* We decode in place. This is safe because this is a new buffer (not
* aliasing the input) and because base64 decoding shrinks 4 bytes into 3. */
char* out = (char*)str.data;
const char* ptr = str.data;
const char* end = ptr + str.size;
const char* end4 = ptr + (str.size & -4); /* Round down to multiple of 4. */
for (; ptr < end4; ptr += 4, out += 3) {
int val = jsondec_base64_tablelookup(ptr[0]) << 18 |
jsondec_base64_tablelookup(ptr[1]) << 12 |
jsondec_base64_tablelookup(ptr[2]) << 6 |
jsondec_base64_tablelookup(ptr[3]) << 0;
if (val < 0) {
/* Junk chars or padding. Remove trailing padding, if any. */
if (end - ptr == 4 && ptr[3] == '=') {
if (ptr[2] == '=') {
end -= 2;
} else {
end -= 1;
}
}
break;
}
out[0] = val >> 16;
out[1] = (val >> 8) & 0xff;
out[2] = val & 0xff;
}
if (ptr < end) {
/* Process remaining chars. We do not require padding. */
out = jsondec_partialbase64(d, ptr, end, out);
}
return out - str.data;
}
/* Low-level integer parsing **************************************************/
static const char* jsondec_buftouint64(jsondec* d, const char* ptr,
const char* end, uint64_t* val) {
const char* out = upb_BufToUint64(ptr, end, val);
if (!out) jsondec_err(d, "Integer overflow");
return out;
}
static const char* jsondec_buftoint64(jsondec* d, const char* ptr,
const char* end, int64_t* val,
bool* is_neg) {
const char* out = upb_BufToInt64(ptr, end, val, is_neg);
if (!out) jsondec_err(d, "Integer overflow");
return out;
}
static uint64_t jsondec_strtouint64(jsondec* d, upb_StringView str) {
const char* end = str.data + str.size;
uint64_t ret;
if (jsondec_buftouint64(d, str.data, end, &ret) != end) {
jsondec_err(d, "Non-number characters in quoted integer");
}
return ret;
}
static int64_t jsondec_strtoint64(jsondec* d, upb_StringView str) {
const char* end = str.data + str.size;
int64_t ret;
if (jsondec_buftoint64(d, str.data, end, &ret, NULL) != end) {
jsondec_err(d, "Non-number characters in quoted integer");
}
return ret;
}
/* Primitive value types ******************************************************/
/* Parse INT32 or INT64 value. */
static upb_MessageValue jsondec_int(jsondec* d, const upb_FieldDef* f) {
upb_MessageValue val;
switch (jsondec_peek(d)) {
case JD_NUMBER: {
double dbl = jsondec_number(d);
if (dbl > 9223372036854774784.0 || dbl < -9223372036854775808.0) {
jsondec_err(d, "JSON number is out of range.");
}
val.int64_val = dbl; /* must be guarded, overflow here is UB */
if (val.int64_val != dbl) {
jsondec_errf(d, "JSON number was not integral (%f != %" PRId64 ")", dbl,
val.int64_val);
}
break;
}
case JD_STRING: {
upb_StringView str = jsondec_string(d);
val.int64_val = jsondec_strtoint64(d, str);
break;
}
default:
jsondec_err(d, "Expected number or string");
}
if (upb_FieldDef_CType(f) == kUpb_CType_Int32 ||
upb_FieldDef_CType(f) == kUpb_CType_Enum) {
if (val.int64_val > INT32_MAX || val.int64_val < INT32_MIN) {
jsondec_err(d, "Integer out of range.");
}
val.int32_val = (int32_t)val.int64_val;
}
return val;
}
/* Parse UINT32 or UINT64 value. */
static upb_MessageValue jsondec_uint(jsondec* d, const upb_FieldDef* f) {
upb_MessageValue val = {0};
switch (jsondec_peek(d)) {
case JD_NUMBER: {
double dbl = jsondec_number(d);
if (dbl > 18446744073709549568.0 || dbl < 0) {
jsondec_err(d, "JSON number is out of range.");
}
val.uint64_val = dbl; /* must be guarded, overflow here is UB */
if (val.uint64_val != dbl) {
jsondec_errf(d, "JSON number was not integral (%f != %" PRIu64 ")", dbl,
val.uint64_val);
}
break;
}
case JD_STRING: {
upb_StringView str = jsondec_string(d);
val.uint64_val = jsondec_strtouint64(d, str);
break;
}
default:
jsondec_err(d, "Expected number or string");
}
if (upb_FieldDef_CType(f) == kUpb_CType_UInt32) {
if (val.uint64_val > UINT32_MAX) {
jsondec_err(d, "Integer out of range.");
}
val.uint32_val = (uint32_t)val.uint64_val;
}
return val;
}
/* Parse DOUBLE or FLOAT value. */
static upb_MessageValue jsondec_double(jsondec* d, const upb_FieldDef* f) {
upb_StringView str;
upb_MessageValue val = {0};
switch (jsondec_peek(d)) {
case JD_NUMBER:
val.double_val = jsondec_number(d);
break;
case JD_STRING:
str = jsondec_string(d);
if (jsondec_streql(str, "NaN")) {
val.double_val = NAN;
} else if (jsondec_streql(str, "Infinity")) {
val.double_val = INFINITY;
} else if (jsondec_streql(str, "-Infinity")) {
val.double_val = -INFINITY;
} else {
val.double_val = strtod(str.data, NULL);
}
break;
default:
jsondec_err(d, "Expected number or string");
}
if (upb_FieldDef_CType(f) == kUpb_CType_Float) {
float f = val.double_val;
if (val.double_val != INFINITY && val.double_val != -INFINITY) {
if (f == INFINITY || f == -INFINITY) jsondec_err(d, "Float out of range");
}
val.float_val = f;
}
return val;
}
/* Parse STRING or BYTES value. */
static upb_MessageValue jsondec_strfield(jsondec* d, const upb_FieldDef* f) {
upb_MessageValue val;
val.str_val = jsondec_string(d);
if (upb_FieldDef_CType(f) == kUpb_CType_Bytes) {
val.str_val.size = jsondec_base64(d, val.str_val);
}
return val;
}
static upb_JsonMessageValue jsondec_enum(jsondec* d, const upb_FieldDef* f) {
switch (jsondec_peek(d)) {
case JD_STRING: {
upb_StringView str = jsondec_string(d);
const upb_EnumDef* e = upb_FieldDef_EnumSubDef(f);
const upb_EnumValueDef* ev =
upb_EnumDef_FindValueByNameWithSize(e, str.data, str.size);
upb_JsonMessageValue val = {.ignore = false};
if (ev) {
val.value.int32_val = upb_EnumValueDef_Number(ev);
} else {
if (d->options & upb_JsonDecode_IgnoreUnknown) {
val.ignore = true;
} else {
jsondec_errf(d, "Unknown enumerator: '" UPB_STRINGVIEW_FORMAT "'",
UPB_STRINGVIEW_ARGS(str));
}
}
return val;
}
case JD_NULL: {
if (jsondec_isnullvalue(f)) {
upb_JsonMessageValue val = {.ignore = false};
jsondec_null(d);
val.value.int32_val = 0;
return val;
}
}
/* Fallthrough. */
default:
return (upb_JsonMessageValue){.value = jsondec_int(d, f),
.ignore = false};
}
}
static upb_MessageValue jsondec_bool(jsondec* d, const upb_FieldDef* f) {
bool is_map_key = upb_FieldDef_Number(f) == 1 &&
upb_MessageDef_IsMapEntry(upb_FieldDef_ContainingType(f));
upb_MessageValue val;
if (is_map_key) {
upb_StringView str = jsondec_string(d);
if (jsondec_streql(str, "true")) {
val.bool_val = true;
} else if (jsondec_streql(str, "false")) {
val.bool_val = false;
} else {
jsondec_err(d, "Invalid boolean map key");
}
} else {
switch (jsondec_peek(d)) {
case JD_TRUE:
val.bool_val = true;
jsondec_true(d);
break;
case JD_FALSE:
val.bool_val = false;
jsondec_false(d);
break;
default:
jsondec_err(d, "Expected true or false");
}
}
return val;
}
/* Composite types (array/message/map) ****************************************/
static void jsondec_array(jsondec* d, upb_Message* msg, const upb_FieldDef* f) {
upb_Array* arr = upb_Message_Mutable(msg, f, d->arena).array;
jsondec_arrstart(d);
while (jsondec_arrnext(d)) {
upb_JsonMessageValue elem = jsondec_value(d, f);
if (!elem.ignore) {
upb_Array_Append(arr, elem.value, d->arena);
}
}
jsondec_arrend(d);
}
static void jsondec_map(jsondec* d, upb_Message* msg, const upb_FieldDef* f) {
upb_Map* map = upb_Message_Mutable(msg, f, d->arena).map;
const upb_MessageDef* entry = upb_FieldDef_MessageSubDef(f);
const upb_FieldDef* key_f = upb_MessageDef_FindFieldByNumber(entry, 1);
const upb_FieldDef* val_f = upb_MessageDef_FindFieldByNumber(entry, 2);
jsondec_objstart(d);
while (jsondec_objnext(d)) {
upb_JsonMessageValue key, val;
key = jsondec_value(d, key_f);
UPB_ASSUME(!key.ignore); // Map key cannot be enum.
jsondec_entrysep(d);
val = jsondec_value(d, val_f);
if (!val.ignore) {
upb_Map_Set(map, key.value, val.value, d->arena);
}
}
jsondec_objend(d);
}
static void jsondec_tomsg(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
if (upb_MessageDef_WellKnownType(m) == kUpb_WellKnown_Unspecified) {
jsondec_object(d, msg, m);
} else {
jsondec_wellknown(d, msg, m);
}
}
static upb_MessageValue jsondec_msg(jsondec* d, const upb_FieldDef* f) {
const upb_MessageDef* m = upb_FieldDef_MessageSubDef(f);
const upb_MiniTable* layout = upb_MessageDef_MiniTable(m);
upb_Message* msg = upb_Message_New(layout, d->arena);
upb_MessageValue val;
jsondec_tomsg(d, msg, m);
val.msg_val = msg;
return val;
}
static void jsondec_field(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
upb_StringView name;
const upb_FieldDef* f;
const upb_FieldDef* preserved;
name = jsondec_string(d);
jsondec_entrysep(d);
if (name.size >= 2 && name.data[0] == '[' &&
name.data[name.size - 1] == ']') {
f = upb_DefPool_FindExtensionByNameWithSize(d->symtab, name.data + 1,
name.size - 2);
if (f && upb_FieldDef_ContainingType(f) != m) {
jsondec_errf(
d, "Extension %s extends message %s, but was seen in message %s",
upb_FieldDef_FullName(f),
upb_MessageDef_FullName(upb_FieldDef_ContainingType(f)),
upb_MessageDef_FullName(m));
}
} else {
f = upb_MessageDef_FindByJsonNameWithSize(m, name.data, name.size);
}
if (!f) {
if ((d->options & upb_JsonDecode_IgnoreUnknown) == 0) {
jsondec_errf(d, "No such field: " UPB_STRINGVIEW_FORMAT,
UPB_STRINGVIEW_ARGS(name));
}
jsondec_skipval(d);
return;
}
if (jsondec_peek(d) == JD_NULL && !jsondec_isvalue(f)) {
/* JSON "null" indicates a default value, so no need to set anything. */
jsondec_null(d);
return;
}
if (upb_FieldDef_RealContainingOneof(f) &&
upb_Message_WhichOneof(msg, upb_FieldDef_ContainingOneof(f))) {
jsondec_err(d, "More than one field for this oneof.");
}
preserved = d->debug_field;
d->debug_field = f;
if (upb_FieldDef_IsMap(f)) {
jsondec_map(d, msg, f);
} else if (upb_FieldDef_IsRepeated(f)) {
jsondec_array(d, msg, f);
} else if (upb_FieldDef_IsSubMessage(f)) {
upb_Message* submsg = upb_Message_Mutable(msg, f, d->arena).msg;
const upb_MessageDef* subm = upb_FieldDef_MessageSubDef(f);
jsondec_tomsg(d, submsg, subm);
} else {
upb_JsonMessageValue val = jsondec_value(d, f);
if (!val.ignore) {
upb_Message_SetFieldByDef(msg, f, val.value, d->arena);
}
}
d->debug_field = preserved;
}
static void jsondec_object(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
jsondec_objstart(d);
while (jsondec_objnext(d)) {
jsondec_field(d, msg, m);
}
jsondec_objend(d);
}
static upb_MessageValue jsondec_nonenum(jsondec* d, const upb_FieldDef* f) {
switch (upb_FieldDef_CType(f)) {
case kUpb_CType_Bool:
return jsondec_bool(d, f);
case kUpb_CType_Float:
case kUpb_CType_Double:
return jsondec_double(d, f);
case kUpb_CType_UInt32:
case kUpb_CType_UInt64:
return jsondec_uint(d, f);
case kUpb_CType_Int32:
case kUpb_CType_Int64:
return jsondec_int(d, f);
case kUpb_CType_String:
case kUpb_CType_Bytes:
return jsondec_strfield(d, f);
case kUpb_CType_Message:
return jsondec_msg(d, f);
case kUpb_CType_Enum:
default:
UPB_UNREACHABLE();
}
}
static upb_JsonMessageValue jsondec_value(jsondec* d, const upb_FieldDef* f) {
if (upb_FieldDef_CType(f) == kUpb_CType_Enum) {
return jsondec_enum(d, f);
} else {
return (upb_JsonMessageValue){.value = jsondec_nonenum(d, f),
.ignore = false};
}
}
/* Well-known types ***********************************************************/
static int jsondec_tsdigits(jsondec* d, const char** ptr, size_t digits,
const char* after) {
uint64_t val;
const char* p = *ptr;
const char* end = p + digits;
size_t after_len = after ? strlen(after) : 0;
UPB_ASSERT(digits <= 9); /* int can't overflow. */
if (jsondec_buftouint64(d, p, end, &val) != end ||
(after_len && memcmp(end, after, after_len) != 0)) {
jsondec_err(d, "Malformed timestamp");
}
UPB_ASSERT(val < INT_MAX);
*ptr = end + after_len;
return (int)val;
}
static int jsondec_nanos(jsondec* d, const char** ptr, const char* end) {
uint64_t nanos = 0;
const char* p = *ptr;
if (p != end && *p == '.') {
const char* nano_end = jsondec_buftouint64(d, p + 1, end, &nanos);
int digits = (int)(nano_end - p - 1);
int exp_lg10 = 9 - digits;
if (digits > 9) {
jsondec_err(d, "Too many digits for partial seconds");
}
while (exp_lg10--) nanos *= 10;
*ptr = nano_end;
}
UPB_ASSERT(nanos < INT_MAX);
return (int)nanos;
}
/* jsondec_epochdays(1970, 1, 1) == 1970-01-01 == 0. */
int jsondec_epochdays(int y, int m, int d) {
const uint32_t year_base = 4800; /* Before min year, multiple of 400. */
const uint32_t m_adj = m - 3; /* March-based month. */
const uint32_t carry = m_adj > (uint32_t)m ? 1 : 0;
const uint32_t adjust = carry ? 12 : 0;
const uint32_t y_adj = y + year_base - carry;
const uint32_t month_days = ((m_adj + adjust) * 62719 + 769) / 2048;
const uint32_t leap_days = y_adj / 4 - y_adj / 100 + y_adj / 400;
return y_adj * 365 + leap_days + month_days + (d - 1) - 2472632;
}
static int64_t jsondec_unixtime(int y, int m, int d, int h, int min, int s) {
return (int64_t)jsondec_epochdays(y, m, d) * 86400 + h * 3600 + min * 60 + s;
}
static void jsondec_timestamp(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
upb_MessageValue seconds;
upb_MessageValue nanos;
upb_StringView str = jsondec_string(d);
const char* ptr = str.data;
const char* end = ptr + str.size;
if (str.size < 20) goto malformed;
{
/* 1972-01-01T01:00:00 */
int year = jsondec_tsdigits(d, &ptr, 4, "-");
int mon = jsondec_tsdigits(d, &ptr, 2, "-");
int day = jsondec_tsdigits(d, &ptr, 2, "T");
int hour = jsondec_tsdigits(d, &ptr, 2, ":");
int min = jsondec_tsdigits(d, &ptr, 2, ":");
int sec = jsondec_tsdigits(d, &ptr, 2, NULL);
seconds.int64_val = jsondec_unixtime(year, mon, day, hour, min, sec);
}
nanos.int32_val = jsondec_nanos(d, &ptr, end);
{
/* [+-]08:00 or Z */
int ofs_hour = 0;
int ofs_min = 0;
bool neg = false;
if (ptr == end) goto malformed;
switch (*ptr++) {
case '-':
neg = true;
/* fallthrough */
case '+':
if ((end - ptr) != 5) goto malformed;
ofs_hour = jsondec_tsdigits(d, &ptr, 2, ":");
ofs_min = jsondec_tsdigits(d, &ptr, 2, NULL);
ofs_min = ((ofs_hour * 60) + ofs_min) * 60;
seconds.int64_val += (neg ? ofs_min : -ofs_min);
break;
case 'Z':
if (ptr != end) goto malformed;
break;
default:
goto malformed;
}
}
if (seconds.int64_val < -62135596800) {
jsondec_err(d, "Timestamp out of range");
}
upb_Message_SetFieldByDef(msg, upb_MessageDef_FindFieldByNumber(m, 1),
seconds, d->arena);
upb_Message_SetFieldByDef(msg, upb_MessageDef_FindFieldByNumber(m, 2), nanos,
d->arena);
return;
malformed:
jsondec_err(d, "Malformed timestamp");
}
static void jsondec_duration(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
upb_MessageValue seconds;
upb_MessageValue nanos;
upb_StringView str = jsondec_string(d);
const char* ptr = str.data;
const char* end = ptr + str.size;
const int64_t max = (uint64_t)3652500 * 86400;
bool neg = false;
/* "3.000000001s", "3s", etc. */
ptr = jsondec_buftoint64(d, ptr, end, &seconds.int64_val, &neg);
nanos.int32_val = jsondec_nanos(d, &ptr, end);
if (end - ptr != 1 || *ptr != 's') {
jsondec_err(d, "Malformed duration");
}
if (seconds.int64_val < -max || seconds.int64_val > max) {
jsondec_err(d, "Duration out of range");
}
if (neg) {
nanos.int32_val = -nanos.int32_val;
}
upb_Message_SetFieldByDef(msg, upb_MessageDef_FindFieldByNumber(m, 1),
seconds, d->arena);
upb_Message_SetFieldByDef(msg, upb_MessageDef_FindFieldByNumber(m, 2), nanos,
d->arena);
}
static void jsondec_listvalue(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
const upb_FieldDef* values_f = upb_MessageDef_FindFieldByNumber(m, 1);
const upb_MessageDef* value_m = upb_FieldDef_MessageSubDef(values_f);
const upb_MiniTable* value_layout = upb_MessageDef_MiniTable(value_m);
upb_Array* values = upb_Message_Mutable(msg, values_f, d->arena).array;
jsondec_arrstart(d);
while (jsondec_arrnext(d)) {
upb_Message* value_msg = upb_Message_New(value_layout, d->arena);
upb_MessageValue value;
value.msg_val = value_msg;
upb_Array_Append(values, value, d->arena);
jsondec_wellknownvalue(d, value_msg, value_m);
}
jsondec_arrend(d);
}
static void jsondec_struct(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
const upb_FieldDef* fields_f = upb_MessageDef_FindFieldByNumber(m, 1);
const upb_MessageDef* entry_m = upb_FieldDef_MessageSubDef(fields_f);
const upb_FieldDef* value_f = upb_MessageDef_FindFieldByNumber(entry_m, 2);
const upb_MessageDef* value_m = upb_FieldDef_MessageSubDef(value_f);
const upb_MiniTable* value_layout = upb_MessageDef_MiniTable(value_m);
upb_Map* fields = upb_Message_Mutable(msg, fields_f, d->arena).map;
jsondec_objstart(d);
while (jsondec_objnext(d)) {
upb_MessageValue key, value;
upb_Message* value_msg = upb_Message_New(value_layout, d->arena);
key.str_val = jsondec_string(d);
value.msg_val = value_msg;
upb_Map_Set(fields, key, value, d->arena);
jsondec_entrysep(d);
jsondec_wellknownvalue(d, value_msg, value_m);
}
jsondec_objend(d);
}
static void jsondec_wellknownvalue(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
upb_MessageValue val;
const upb_FieldDef* f;
upb_Message* submsg;
switch (jsondec_peek(d)) {
case JD_NUMBER:
/* double number_value = 2; */
f = upb_MessageDef_FindFieldByNumber(m, 2);
val.double_val = jsondec_number(d);
break;
case JD_STRING:
/* string string_value = 3; */
f = upb_MessageDef_FindFieldByNumber(m, 3);
val.str_val = jsondec_string(d);
break;
case JD_FALSE:
/* bool bool_value = 4; */
f = upb_MessageDef_FindFieldByNumber(m, 4);
val.bool_val = false;
jsondec_false(d);
break;
case JD_TRUE:
/* bool bool_value = 4; */
f = upb_MessageDef_FindFieldByNumber(m, 4);
val.bool_val = true;
jsondec_true(d);
break;
case JD_NULL:
/* NullValue null_value = 1; */
f = upb_MessageDef_FindFieldByNumber(m, 1);
val.int32_val = 0;
jsondec_null(d);
break;
/* Note: these cases return, because upb_Message_Mutable() is enough. */
case JD_OBJECT:
/* Struct struct_value = 5; */
f = upb_MessageDef_FindFieldByNumber(m, 5);
submsg = upb_Message_Mutable(msg, f, d->arena).msg;
jsondec_struct(d, submsg, upb_FieldDef_MessageSubDef(f));
return;
case JD_ARRAY:
/* ListValue list_value = 6; */
f = upb_MessageDef_FindFieldByNumber(m, 6);
submsg = upb_Message_Mutable(msg, f, d->arena).msg;
jsondec_listvalue(d, submsg, upb_FieldDef_MessageSubDef(f));
return;
default:
UPB_UNREACHABLE();
}
upb_Message_SetFieldByDef(msg, f, val, d->arena);
}
static upb_StringView jsondec_mask(jsondec* d, const char* buf,
const char* end) {
/* FieldMask fields grow due to inserted '_' characters, so we can't do the
* transform in place. */
const char* ptr = buf;
upb_StringView ret;
char* out;
ret.size = end - ptr;
while (ptr < end) {
ret.size += (*ptr >= 'A' && *ptr <= 'Z');
ptr++;
}
out = upb_Arena_Malloc(d->arena, ret.size);
ptr = buf;
ret.data = out;
while (ptr < end) {
char ch = *ptr++;
if (ch >= 'A' && ch <= 'Z') {
*out++ = '_';
*out++ = ch + 32;
} else if (ch == '_') {
jsondec_err(d, "field mask may not contain '_'");
} else {
*out++ = ch;
}
}
return ret;
}
static void jsondec_fieldmask(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
/* repeated string paths = 1; */
const upb_FieldDef* paths_f = upb_MessageDef_FindFieldByNumber(m, 1);
upb_Array* arr = upb_Message_Mutable(msg, paths_f, d->arena).array;
upb_StringView str = jsondec_string(d);
const char* ptr = str.data;
const char* end = ptr + str.size;
upb_MessageValue val;
while (ptr < end) {
const char* elem_end = memchr(ptr, ',', end - ptr);
if (elem_end) {
val.str_val = jsondec_mask(d, ptr, elem_end);
ptr = elem_end + 1;
} else {
val.str_val = jsondec_mask(d, ptr, end);
ptr = end;
}
upb_Array_Append(arr, val, d->arena);
}
}
static void jsondec_anyfield(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
if (upb_MessageDef_WellKnownType(m) == kUpb_WellKnown_Unspecified) {
/* For regular types: {"@type": "[user type]", "f1": <V1>, "f2": <V2>}
* where f1, f2, etc. are the normal fields of this type. */
jsondec_field(d, msg, m);
} else {
/* For well-known types: {"@type": "[well-known type]", "value": <X>}
* where <X> is whatever encoding the WKT normally uses. */
upb_StringView str = jsondec_string(d);
jsondec_entrysep(d);
if (!jsondec_streql(str, "value")) {
jsondec_err(d, "Key for well-known type must be 'value'");
}
jsondec_wellknown(d, msg, m);
}
}
static const upb_MessageDef* jsondec_typeurl(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
const upb_FieldDef* type_url_f = upb_MessageDef_FindFieldByNumber(m, 1);
const upb_MessageDef* type_m;
upb_StringView type_url = jsondec_string(d);
const char* end = type_url.data + type_url.size;
const char* ptr = end;
upb_MessageValue val;
val.str_val = type_url;
upb_Message_SetFieldByDef(msg, type_url_f, val, d->arena);
/* Find message name after the last '/' */
while (ptr > type_url.data && *--ptr != '/') {
}
if (ptr == type_url.data || ptr == end) {
jsondec_err(d, "Type url must have at least one '/' and non-empty host");
}
ptr++;
type_m = upb_DefPool_FindMessageByNameWithSize(d->symtab, ptr, end - ptr);
if (!type_m) {
jsondec_err(d, "Type was not found");
}
return type_m;
}
static void jsondec_any(jsondec* d, upb_Message* msg, const upb_MessageDef* m) {
/* string type_url = 1;
* bytes value = 2; */
const upb_FieldDef* value_f = upb_MessageDef_FindFieldByNumber(m, 2);
upb_Message* any_msg;
const upb_MessageDef* any_m = NULL;
const char* pre_type_data = NULL;
const char* pre_type_end = NULL;
upb_MessageValue encoded;
jsondec_objstart(d);
/* Scan looking for "@type", which is not necessarily first. */
while (!any_m && jsondec_objnext(d)) {
const char* start = d->ptr;
upb_StringView name = jsondec_string(d);
jsondec_entrysep(d);
if (jsondec_streql(name, "@type")) {
any_m = jsondec_typeurl(d, msg, m);
if (pre_type_data) {
pre_type_end = start;
while (*pre_type_end != ',') pre_type_end--;
}
} else {
if (!pre_type_data) pre_type_data = start;
jsondec_skipval(d);
}
}
if (!any_m) {
jsondec_err(d, "Any object didn't contain a '@type' field");
}
const upb_MiniTable* any_layout = upb_MessageDef_MiniTable(any_m);
any_msg = upb_Message_New(any_layout, d->arena);
if (pre_type_data) {
size_t len = pre_type_end - pre_type_data + 1;
char* tmp = upb_Arena_Malloc(d->arena, len);
const char* saved_ptr = d->ptr;
const char* saved_end = d->end;
memcpy(tmp, pre_type_data, len - 1);
tmp[len - 1] = '}';
d->ptr = tmp;
d->end = tmp + len;
d->is_first = true;
while (jsondec_objnext(d)) {
jsondec_anyfield(d, any_msg, any_m);
}
d->ptr = saved_ptr;
d->end = saved_end;
}
while (jsondec_objnext(d)) {
jsondec_anyfield(d, any_msg, any_m);
}
jsondec_objend(d);
upb_EncodeStatus status =
upb_Encode(any_msg, upb_MessageDef_MiniTable(any_m), 0, d->arena,
(char**)&encoded.str_val.data, &encoded.str_val.size);
// TODO: We should fail gracefully here on a bad return status.
UPB_ASSERT(status == kUpb_EncodeStatus_Ok);
upb_Message_SetFieldByDef(msg, value_f, encoded, d->arena);
}
static void jsondec_wrapper(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
const upb_FieldDef* value_f = upb_MessageDef_FindFieldByNumber(m, 1);
upb_JsonMessageValue val = jsondec_value(d, value_f);
UPB_ASSUME(val.ignore == false); // Wrapper cannot be an enum.
upb_Message_SetFieldByDef(msg, value_f, val.value, d->arena);
}
static void jsondec_wellknown(jsondec* d, upb_Message* msg,
const upb_MessageDef* m) {
switch (upb_MessageDef_WellKnownType(m)) {
case kUpb_WellKnown_Any:
jsondec_any(d, msg, m);
break;
case kUpb_WellKnown_FieldMask:
jsondec_fieldmask(d, msg, m);
break;
case kUpb_WellKnown_Duration:
jsondec_duration(d, msg, m);
break;
case kUpb_WellKnown_Timestamp:
jsondec_timestamp(d, msg, m);
break;
case kUpb_WellKnown_Value:
jsondec_wellknownvalue(d, msg, m);
break;
case kUpb_WellKnown_ListValue:
jsondec_listvalue(d, msg, m);
break;
case kUpb_WellKnown_Struct:
jsondec_struct(d, msg, m);
break;
case kUpb_WellKnown_DoubleValue:
case kUpb_WellKnown_FloatValue:
case kUpb_WellKnown_Int64Value:
case kUpb_WellKnown_UInt64Value:
case kUpb_WellKnown_Int32Value:
case kUpb_WellKnown_UInt32Value:
case kUpb_WellKnown_StringValue:
case kUpb_WellKnown_BytesValue:
case kUpb_WellKnown_BoolValue:
jsondec_wrapper(d, msg, m);
break;
default:
UPB_UNREACHABLE();
}
}
static bool upb_JsonDecoder_Decode(jsondec* const d, upb_Message* const msg,
const upb_MessageDef* const m) {
if (UPB_SETJMP(d->err)) return false;
jsondec_tomsg(d, msg, m);
// Consume any trailing whitespace before checking if we read the entire
// input.
jsondec_consumews(d);
if (d->ptr == d->end) {
return true;
} else {
jsondec_seterrmsg(d, "unexpected trailing characters");
return false;
}
}
bool upb_JsonDecode(const char* buf, size_t size, upb_Message* msg,
const upb_MessageDef* m, const upb_DefPool* symtab,
int options, upb_Arena* arena, upb_Status* status) {
UPB_ASSERT(!upb_Message_IsFrozen(msg));
jsondec d;
if (size == 0) return true;
d.ptr = buf;
d.end = buf + size;
d.arena = arena;
d.symtab = symtab;
d.status = status;
d.options = options;
d.depth = 64;
d.line = 1;
d.line_begin = d.ptr;
d.debug_field = NULL;
d.is_first = false;
return upb_JsonDecoder_Decode(&d, msg, m);
}