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-rw-r--r--compat/jansson/load.c879
1 files changed, 879 insertions, 0 deletions
diff --git a/compat/jansson/load.c b/compat/jansson/load.c
new file mode 100644
index 0000000..d49a4da
--- /dev/null
+++ b/compat/jansson/load.c
@@ -0,0 +1,879 @@
+/*
+ * Copyright (c) 2009, 2010 Petri Lehtinen <petri@digip.org>
+ *
+ * Jansson is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
+#define _GNU_SOURCE
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <assert.h>
+
+#include <jansson.h>
+#include "jansson_private.h"
+#include "strbuffer.h"
+#include "utf.h"
+
+#define TOKEN_INVALID -1
+#define TOKEN_EOF 0
+#define TOKEN_STRING 256
+#define TOKEN_INTEGER 257
+#define TOKEN_REAL 258
+#define TOKEN_TRUE 259
+#define TOKEN_FALSE 260
+#define TOKEN_NULL 261
+
+/* read one byte from stream, return EOF on end of file */
+typedef int (*get_func)(void *data);
+
+/* return non-zero if end of file has been reached */
+typedef int (*eof_func)(void *data);
+
+typedef struct {
+ get_func get;
+ eof_func eof;
+ void *data;
+ int stream_pos;
+ char buffer[5];
+ int buffer_pos;
+} stream_t;
+
+
+typedef struct {
+ stream_t stream;
+ strbuffer_t saved_text;
+ int token;
+ int line, column;
+ union {
+ char *string;
+ int integer;
+ double real;
+ } value;
+} lex_t;
+
+
+/*** error reporting ***/
+
+static void error_init(json_error_t *error)
+{
+ if(error)
+ {
+ error->text[0] = '\0';
+ error->line = -1;
+ }
+}
+
+static void error_set(json_error_t *error, const lex_t *lex,
+ const char *msg, ...)
+{
+ va_list ap;
+ char text[JSON_ERROR_TEXT_LENGTH];
+
+ if(!error || error->text[0] != '\0') {
+ /* error already set */
+ return;
+ }
+
+ va_start(ap, msg);
+ vsnprintf(text, JSON_ERROR_TEXT_LENGTH, msg, ap);
+ va_end(ap);
+
+ if(lex)
+ {
+ const char *saved_text = strbuffer_value(&lex->saved_text);
+ error->line = lex->line;
+ if(saved_text && saved_text[0])
+ {
+ if(lex->saved_text.length <= 20) {
+ snprintf(error->text, JSON_ERROR_TEXT_LENGTH,
+ "%s near '%s'", text, saved_text);
+ }
+ else
+ snprintf(error->text, JSON_ERROR_TEXT_LENGTH, "%s", text);
+ }
+ else
+ {
+ snprintf(error->text, JSON_ERROR_TEXT_LENGTH,
+ "%s near end of file", text);
+ }
+ }
+ else
+ {
+ error->line = -1;
+ snprintf(error->text, JSON_ERROR_TEXT_LENGTH, "%s", text);
+ }
+}
+
+
+/*** lexical analyzer ***/
+
+static void
+stream_init(stream_t *stream, get_func get, eof_func eof, void *data)
+{
+ stream->get = get;
+ stream->eof = eof;
+ stream->data = data;
+ stream->stream_pos = 0;
+ stream->buffer[0] = '\0';
+ stream->buffer_pos = 0;
+}
+
+static char stream_get(stream_t *stream, json_error_t *error)
+{
+ char c;
+
+ if(!stream->buffer[stream->buffer_pos])
+ {
+ stream->buffer[0] = stream->get(stream->data);
+ stream->buffer_pos = 0;
+
+ c = stream->buffer[0];
+
+ if((unsigned char)c >= 0x80 && c != (char)EOF)
+ {
+ /* multi-byte UTF-8 sequence */
+ int i, count;
+
+ count = utf8_check_first(c);
+ if(!count)
+ goto out;
+
+ assert(count >= 2);
+
+ for(i = 1; i < count; i++)
+ stream->buffer[i] = stream->get(stream->data);
+
+ if(!utf8_check_full(stream->buffer, count, NULL))
+ goto out;
+
+ stream->stream_pos += count;
+ stream->buffer[count] = '\0';
+ }
+ else {
+ stream->buffer[1] = '\0';
+ stream->stream_pos++;
+ }
+ }
+
+ return stream->buffer[stream->buffer_pos++];
+
+out:
+ error_set(error, NULL, "unable to decode byte 0x%x at position %d",
+ (unsigned char)c, stream->stream_pos);
+
+ stream->buffer[0] = EOF;
+ stream->buffer[1] = '\0';
+ stream->buffer_pos = 1;
+
+ return EOF;
+}
+
+static void stream_unget(stream_t *stream, char c)
+{
+ assert(stream->buffer_pos > 0);
+ stream->buffer_pos--;
+ assert(stream->buffer[stream->buffer_pos] == c);
+}
+
+
+static int lex_get(lex_t *lex, json_error_t *error)
+{
+ return stream_get(&lex->stream, error);
+}
+
+static int lex_eof(lex_t *lex)
+{
+ return lex->stream.eof(lex->stream.data);
+}
+
+static void lex_save(lex_t *lex, char c)
+{
+ strbuffer_append_byte(&lex->saved_text, c);
+}
+
+static int lex_get_save(lex_t *lex, json_error_t *error)
+{
+ char c = stream_get(&lex->stream, error);
+ lex_save(lex, c);
+ return c;
+}
+
+static void lex_unget_unsave(lex_t *lex, char c)
+{
+ char d;
+ stream_unget(&lex->stream, c);
+ d = strbuffer_pop(&lex->saved_text);
+ assert(c == d);
+}
+
+static void lex_save_cached(lex_t *lex)
+{
+ while(lex->stream.buffer[lex->stream.buffer_pos] != '\0')
+ {
+ lex_save(lex, lex->stream.buffer[lex->stream.buffer_pos]);
+ lex->stream.buffer_pos++;
+ }
+}
+
+/* assumes that str points to 'u' plus at least 4 valid hex digits */
+static int32_t decode_unicode_escape(const char *str)
+{
+ int i;
+ int32_t value = 0;
+
+ assert(str[0] == 'u');
+
+ for(i = 1; i <= 4; i++) {
+ char c = str[i];
+ value <<= 4;
+ if(isdigit(c))
+ value += c - '0';
+ else if(islower(c))
+ value += c - 'a' + 10;
+ else if(isupper(c))
+ value += c - 'A' + 10;
+ else
+ assert(0);
+ }
+
+ return value;
+}
+
+static void lex_scan_string(lex_t *lex, json_error_t *error)
+{
+ char c;
+ const char *p;
+ char *t;
+ int i;
+
+ lex->value.string = NULL;
+ lex->token = TOKEN_INVALID;
+
+ c = lex_get_save(lex, error);
+
+ while(c != '"') {
+ if(c == (char)EOF) {
+ lex_unget_unsave(lex, c);
+ if(lex_eof(lex))
+ error_set(error, lex, "premature end of input");
+ goto out;
+ }
+
+ else if((unsigned char)c <= 0x1F) {
+ /* control character */
+ lex_unget_unsave(lex, c);
+ if(c == '\n')
+ error_set(error, lex, "unexpected newline", c);
+ else
+ error_set(error, lex, "control character 0x%x", c);
+ goto out;
+ }
+
+ else if(c == '\\') {
+ c = lex_get_save(lex, error);
+ if(c == 'u') {
+ c = lex_get_save(lex, error);
+ for(i = 0; i < 4; i++) {
+ if(!isxdigit(c)) {
+ lex_unget_unsave(lex, c);
+ error_set(error, lex, "invalid escape");
+ goto out;
+ }
+ c = lex_get_save(lex, error);
+ }
+ }
+ else if(c == '"' || c == '\\' || c == '/' || c == 'b' ||
+ c == 'f' || c == 'n' || c == 'r' || c == 't')
+ c = lex_get_save(lex, error);
+ else {
+ lex_unget_unsave(lex, c);
+ error_set(error, lex, "invalid escape");
+ goto out;
+ }
+ }
+ else
+ c = lex_get_save(lex, error);
+ }
+
+ /* the actual value is at most of the same length as the source
+ string, because:
+ - shortcut escapes (e.g. "\t") (length 2) are converted to 1 byte
+ - a single \uXXXX escape (length 6) is converted to at most 3 bytes
+ - two \uXXXX escapes (length 12) forming an UTF-16 surrogate pair
+ are converted to 4 bytes
+ */
+ lex->value.string = malloc(lex->saved_text.length + 1);
+ if(!lex->value.string) {
+ /* this is not very nice, since TOKEN_INVALID is returned */
+ goto out;
+ }
+
+ /* the target */
+ t = lex->value.string;
+
+ /* + 1 to skip the " */
+ p = strbuffer_value(&lex->saved_text) + 1;
+
+ while(*p != '"') {
+ if(*p == '\\') {
+ p++;
+ if(*p == 'u') {
+ char buffer[4];
+ int length;
+ int32_t value;
+
+ value = decode_unicode_escape(p);
+ p += 5;
+
+ if(0xD800 <= value && value <= 0xDBFF) {
+ /* surrogate pair */
+ if(*p == '\\' && *(p + 1) == 'u') {
+ int32_t value2 = decode_unicode_escape(++p);
+ p += 5;
+
+ if(0xDC00 <= value2 && value2 <= 0xDFFF) {
+ /* valid second surrogate */
+ value =
+ ((value - 0xD800) << 10) +
+ (value2 - 0xDC00) +
+ 0x10000;
+ }
+ else {
+ /* invalid second surrogate */
+ error_set(error, lex,
+ "invalid Unicode '\\u%04X\\u%04X'",
+ value, value2);
+ goto out;
+ }
+ }
+ else {
+ /* no second surrogate */
+ error_set(error, lex, "invalid Unicode '\\u%04X'",
+ value);
+ goto out;
+ }
+ }
+ else if(0xDC00 <= value && value <= 0xDFFF) {
+ error_set(error, lex, "invalid Unicode '\\u%04X'", value);
+ goto out;
+ }
+ else if(value == 0)
+ {
+ error_set(error, lex, "\\u0000 is not allowed");
+ goto out;
+ }
+
+ if(utf8_encode(value, buffer, &length))
+ assert(0);
+
+ memcpy(t, buffer, length);
+ t += length;
+ }
+ else {
+ switch(*p) {
+ case '"': case '\\': case '/':
+ *t = *p; break;
+ case 'b': *t = '\b'; break;
+ case 'f': *t = '\f'; break;
+ case 'n': *t = '\n'; break;
+ case 'r': *t = '\r'; break;
+ case 't': *t = '\t'; break;
+ default: assert(0);
+ }
+ t++;
+ p++;
+ }
+ }
+ else
+ *(t++) = *(p++);
+ }
+ *t = '\0';
+ lex->token = TOKEN_STRING;
+ return;
+
+out:
+ free(lex->value.string);
+}
+
+static int lex_scan_number(lex_t *lex, char c, json_error_t *error)
+{
+ const char *saved_text;
+ char *end;
+ double value;
+
+ lex->token = TOKEN_INVALID;
+
+ if(c == '-')
+ c = lex_get_save(lex, error);
+
+ if(c == '0') {
+ c = lex_get_save(lex, error);
+ if(isdigit(c)) {
+ lex_unget_unsave(lex, c);
+ goto out;
+ }
+ }
+ else if(isdigit(c)) {
+ c = lex_get_save(lex, error);
+ while(isdigit(c))
+ c = lex_get_save(lex, error);
+ }
+ else {
+ lex_unget_unsave(lex, c);
+ goto out;
+ }
+
+ if(c != '.' && c != 'E' && c != 'e') {
+ long value;
+
+ lex_unget_unsave(lex, c);
+
+ saved_text = strbuffer_value(&lex->saved_text);
+ value = strtol(saved_text, &end, 10);
+ assert(end == saved_text + lex->saved_text.length);
+
+ if((value == LONG_MAX && errno == ERANGE) || value > INT_MAX) {
+ error_set(error, lex, "too big integer");
+ goto out;
+ }
+ else if((value == LONG_MIN && errno == ERANGE) || value < INT_MIN) {
+ error_set(error, lex, "too big negative integer");
+ goto out;
+ }
+
+ lex->token = TOKEN_INTEGER;
+ lex->value.integer = (int)value;
+ return 0;
+ }
+
+ if(c == '.') {
+ c = lex_get(lex, error);
+ if(!isdigit(c))
+ goto out;
+ lex_save(lex, c);
+
+ c = lex_get_save(lex, error);
+ while(isdigit(c))
+ c = lex_get_save(lex, error);
+ }
+
+ if(c == 'E' || c == 'e') {
+ c = lex_get_save(lex, error);
+ if(c == '+' || c == '-')
+ c = lex_get_save(lex, error);
+
+ if(!isdigit(c)) {
+ lex_unget_unsave(lex, c);
+ goto out;
+ }
+
+ c = lex_get_save(lex, error);
+ while(isdigit(c))
+ c = lex_get_save(lex, error);
+ }
+
+ lex_unget_unsave(lex, c);
+
+ saved_text = strbuffer_value(&lex->saved_text);
+ value = strtod(saved_text, &end);
+ assert(end == saved_text + lex->saved_text.length);
+
+ if(errno == ERANGE && value != 0) {
+ error_set(error, lex, "real number overflow");
+ goto out;
+ }
+
+ lex->token = TOKEN_REAL;
+ lex->value.real = value;
+ return 0;
+
+out:
+ return -1;
+}
+
+static int lex_scan(lex_t *lex, json_error_t *error)
+{
+ char c;
+
+ strbuffer_clear(&lex->saved_text);
+
+ if(lex->token == TOKEN_STRING) {
+ free(lex->value.string);
+ lex->value.string = NULL;
+ }
+
+ c = lex_get(lex, error);
+ while(c == ' ' || c == '\t' || c == '\n' || c == '\r')
+ {
+ if(c == '\n')
+ lex->line++;
+
+ c = lex_get(lex, error);
+ }
+
+ if(c == (char)EOF) {
+ if(lex_eof(lex))
+ lex->token = TOKEN_EOF;
+ else
+ lex->token = TOKEN_INVALID;
+ goto out;
+ }
+
+ lex_save(lex, c);
+
+ if(c == '{' || c == '}' || c == '[' || c == ']' || c == ':' || c == ',')
+ lex->token = c;
+
+ else if(c == '"')
+ lex_scan_string(lex, error);
+
+ else if(isdigit(c) || c == '-') {
+ if(lex_scan_number(lex, c, error))
+ goto out;
+ }
+
+ else if(isupper(c) || islower(c)) {
+ /* eat up the whole identifier for clearer error messages */
+ const char *saved_text;
+
+ c = lex_get_save(lex, error);
+ while(isupper(c) || islower(c))
+ c = lex_get_save(lex, error);
+ lex_unget_unsave(lex, c);
+
+ saved_text = strbuffer_value(&lex->saved_text);
+
+ if(strcmp(saved_text, "true") == 0)
+ lex->token = TOKEN_TRUE;
+ else if(strcmp(saved_text, "false") == 0)
+ lex->token = TOKEN_FALSE;
+ else if(strcmp(saved_text, "null") == 0)
+ lex->token = TOKEN_NULL;
+ else
+ lex->token = TOKEN_INVALID;
+ }
+
+ else {
+ /* save the rest of the input UTF-8 sequence to get an error
+ message of valid UTF-8 */
+ lex_save_cached(lex);
+ lex->token = TOKEN_INVALID;
+ }
+
+out:
+ return lex->token;
+}
+
+static char *lex_steal_string(lex_t *lex)
+{
+ char *result = NULL;
+ if(lex->token == TOKEN_STRING)
+ {
+ result = lex->value.string;
+ lex->value.string = NULL;
+ }
+ return result;
+}
+
+static int lex_init(lex_t *lex, get_func get, eof_func eof, void *data)
+{
+ stream_init(&lex->stream, get, eof, data);
+ if(strbuffer_init(&lex->saved_text))
+ return -1;
+
+ lex->token = TOKEN_INVALID;
+ lex->line = 1;
+
+ return 0;
+}
+
+static void lex_close(lex_t *lex)
+{
+ if(lex->token == TOKEN_STRING)
+ free(lex->value.string);
+ strbuffer_close(&lex->saved_text);
+}
+
+
+/*** parser ***/
+
+static json_t *parse_value(lex_t *lex, json_error_t *error);
+
+static json_t *parse_object(lex_t *lex, json_error_t *error)
+{
+ json_t *object = json_object();
+ if(!object)
+ return NULL;
+
+ lex_scan(lex, error);
+ if(lex->token == '}')
+ return object;
+
+ while(1) {
+ char *key;
+ json_t *value;
+
+ if(lex->token != TOKEN_STRING) {
+ error_set(error, lex, "string or '}' expected");
+ goto error;
+ }
+
+ key = lex_steal_string(lex);
+ if(!key)
+ return NULL;
+
+ lex_scan(lex, error);
+ if(lex->token != ':') {
+ free(key);
+ error_set(error, lex, "':' expected");
+ goto error;
+ }
+
+ lex_scan(lex, error);
+ value = parse_value(lex, error);
+ if(!value) {
+ free(key);
+ goto error;
+ }
+
+ if(json_object_set_nocheck(object, key, value)) {
+ free(key);
+ json_decref(value);
+ goto error;
+ }
+
+ json_decref(value);
+ free(key);
+
+ lex_scan(lex, error);
+ if(lex->token != ',')
+ break;
+
+ lex_scan(lex, error);
+ }
+
+ if(lex->token != '}') {
+ error_set(error, lex, "'}' expected");
+ goto error;
+ }
+
+ return object;
+
+error:
+ json_decref(object);
+ return NULL;
+}
+
+static json_t *parse_array(lex_t *lex, json_error_t *error)
+{
+ json_t *array = json_array();
+ if(!array)
+ return NULL;
+
+ lex_scan(lex, error);
+ if(lex->token == ']')
+ return array;
+
+ while(lex->token) {
+ json_t *elem = parse_value(lex, error);
+ if(!elem)
+ goto error;
+
+ if(json_array_append(array, elem)) {
+ json_decref(elem);
+ goto error;
+ }
+ json_decref(elem);
+
+ lex_scan(lex, error);
+ if(lex->token != ',')
+ break;
+
+ lex_scan(lex, error);
+ }
+
+ if(lex->token != ']') {
+ error_set(error, lex, "']' expected");
+ goto error;
+ }
+
+ return array;
+
+error:
+ json_decref(array);
+ return NULL;
+}
+
+static json_t *parse_value(lex_t *lex, json_error_t *error)
+{
+ json_t *json;
+
+ switch(lex->token) {
+ case TOKEN_STRING: {
+ json = json_string_nocheck(lex->value.string);
+ break;
+ }
+
+ case TOKEN_INTEGER: {
+ json = json_integer(lex->value.integer);
+ break;
+ }
+
+ case TOKEN_REAL: {
+ json = json_real(lex->value.real);
+ break;
+ }
+
+ case TOKEN_TRUE:
+ json = json_true();
+ break;
+
+ case TOKEN_FALSE:
+ json = json_false();
+ break;
+
+ case TOKEN_NULL:
+ json = json_null();
+ break;
+
+ case '{':
+ json = parse_object(lex, error);
+ break;
+
+ case '[':
+ json = parse_array(lex, error);
+ break;
+
+ case TOKEN_INVALID:
+ error_set(error, lex, "invalid token");
+ return NULL;
+
+ default:
+ error_set(error, lex, "unexpected token");
+ return NULL;
+ }
+
+ if(!json)
+ return NULL;
+
+ return json;
+}
+
+static json_t *parse_json(lex_t *lex, json_error_t *error)
+{
+ error_init(error);
+
+ lex_scan(lex, error);
+ if(lex->token != '[' && lex->token != '{') {
+ error_set(error, lex, "'[' or '{' expected");
+ return NULL;
+ }
+
+ return parse_value(lex, error);
+}
+
+typedef struct
+{
+ const char *data;
+ int pos;
+} string_data_t;
+
+static int string_get(void *data)
+{
+ char c;
+ string_data_t *stream = (string_data_t *)data;
+ c = stream->data[stream->pos];
+ if(c == '\0')
+ return EOF;
+ else
+ {
+ stream->pos++;
+ return c;
+ }
+}
+
+static int string_eof(void *data)
+{
+ string_data_t *stream = (string_data_t *)data;
+ return (stream->data[stream->pos] == '\0');
+}
+
+json_t *json_loads(const char *string, json_error_t *error)
+{
+ lex_t lex;
+ json_t *result;
+
+ string_data_t stream_data = {
+ .data = string,
+ .pos = 0
+ };
+
+ if(lex_init(&lex, string_get, string_eof, (void *)&stream_data))
+ return NULL;
+
+ result = parse_json(&lex, error);
+ if(!result)
+ goto out;
+
+ lex_scan(&lex, error);
+ if(lex.token != TOKEN_EOF) {
+ error_set(error, &lex, "end of file expected");
+ json_decref(result);
+ result = NULL;
+ }
+
+out:
+ lex_close(&lex);
+ return result;
+}
+
+json_t *json_loadf(FILE *input, json_error_t *error)
+{
+ lex_t lex;
+ json_t *result;
+
+ if(lex_init(&lex, (get_func)fgetc, (eof_func)feof, input))
+ return NULL;
+
+ result = parse_json(&lex, error);
+ if(!result)
+ goto out;
+
+ lex_scan(&lex, error);
+ if(lex.token != TOKEN_EOF) {
+ error_set(error, &lex, "end of file expected");
+ json_decref(result);
+ result = NULL;
+ }
+
+out:
+ lex_close(&lex);
+ return result;
+}
+
+json_t *json_load_file(const char *path, json_error_t *error)
+{
+ json_t *result;
+ FILE *fp;
+
+ error_init(error);
+
+ fp = fopen(path, "r");
+ if(!fp)
+ {
+ error_set(error, NULL, "unable to open %s: %s",
+ path, strerror(errno));
+ return NULL;
+ }
+
+ result = json_loadf(fp, error);
+
+ fclose(fp);
+ return result;
+}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2025-02-19 19:52:03 +0000