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/usr/include/json/json_tokener.h is in libjson0-dev 0.9-1ubuntu1.

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/*
 * $Id: json_tokener.h,v 1.10 2006/07/25 03:24:50 mclark Exp $
 *
 * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
 * Michael Clark <michael@metaparadigm.com>
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See COPYING for details.
 *
 */

#ifndef _json_tokener_h_
#define _json_tokener_h_

#include <stddef.h>
#include "json_object.h"

#ifdef __cplusplus
extern "C" {
#endif

enum json_tokener_error {
  json_tokener_success,
  json_tokener_continue,
  json_tokener_error_depth,
  json_tokener_error_parse_eof,
  json_tokener_error_parse_unexpected,
  json_tokener_error_parse_null,
  json_tokener_error_parse_boolean,
  json_tokener_error_parse_number,
  json_tokener_error_parse_array,
  json_tokener_error_parse_object_key_name,
  json_tokener_error_parse_object_key_sep,
  json_tokener_error_parse_object_value_sep,
  json_tokener_error_parse_string,
  json_tokener_error_parse_comment
};

enum json_tokener_state {
  json_tokener_state_eatws,
  json_tokener_state_start,
  json_tokener_state_finish,
  json_tokener_state_null,
  json_tokener_state_comment_start,
  json_tokener_state_comment,
  json_tokener_state_comment_eol,
  json_tokener_state_comment_end,
  json_tokener_state_string,
  json_tokener_state_string_escape,
  json_tokener_state_escape_unicode,
  json_tokener_state_boolean,
  json_tokener_state_number,
  json_tokener_state_array,
  json_tokener_state_array_add,
  json_tokener_state_array_sep,
  json_tokener_state_object_field_start,
  json_tokener_state_object_field,
  json_tokener_state_object_field_end,
  json_tokener_state_object_value,
  json_tokener_state_object_value_add,
  json_tokener_state_object_sep
};

struct json_tokener_srec
{
  enum json_tokener_state state, saved_state;
  struct json_object *obj;
  struct json_object *current;
  char *obj_field_name;
};

#define JSON_TOKENER_MAX_DEPTH 32

struct json_tokener
{
  char *str;
  struct printbuf *pb;
  int depth, is_double, st_pos, char_offset;
  ptrdiff_t err;
  unsigned int ucs_char;
  char quote_char;
  struct json_tokener_srec stack[JSON_TOKENER_MAX_DEPTH];
};

extern const char* json_tokener_errors[];

extern struct json_tokener* json_tokener_new(void);
extern void json_tokener_free(struct json_tokener *tok);
extern void json_tokener_reset(struct json_tokener *tok);
extern struct json_object* json_tokener_parse(const char *str);
extern struct json_object* json_tokener_parse_ex(struct json_tokener *tok,
						 const char *str, int len);

#ifdef __cplusplus
}
#endif

#endif