+/*
+ * Copyright (c) 2009-2016 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.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include "jansson_private.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "jansson.h"
+#include "strbuffer.h"
+#include "utf.h"
+
+#define STREAM_STATE_OK 0
+#define STREAM_STATE_EOF -1
+#define STREAM_STATE_ERROR -2
+
+#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
+
+/* Locale independent versions of isxxx() functions */
+#define l_isupper(c) ('A' <= (c) && (c) <= 'Z')
+#define l_islower(c) ('a' <= (c) && (c) <= 'z')
+#define l_isalpha(c) (l_isupper(c) || l_islower(c))
+#define l_isdigit(c) ('0' <= (c) && (c) <= '9')
+#define l_isxdigit(c) \
+ (l_isdigit(c) || ('A' <= (c) && (c) <= 'F') || ('a' <= (c) && (c) <= 'f'))
+
+/* Read one byte from stream, convert to unsigned char, then int, and
+ return. return EOF on end of file. This corresponds to the
+ behaviour of fgetc(). */
+typedef int (*get_func)(void *data);
+
+typedef struct {
+ get_func get;
+ void *data;
+ char buffer[5];
+ size_t buffer_pos;
+ int state;
+ int line;
+ int column, last_column;
+ size_t position;
+} stream_t;
+
+typedef struct {
+ stream_t stream;
+ strbuffer_t saved_text;
+ size_t flags;
+ size_t depth;
+ int token;
+ union {
+ struct {
+ char *val;
+ size_t len;
+ } string;
+ json_int_t integer;
+ double real;
+ } value;
+} lex_t;
+
+#define stream_to_lex(stream) container_of(stream, lex_t, stream)
+
+
+/*** error reporting ***/
+
+static void error_set(json_error_t *error, const lex_t *lex,
+ enum json_error_code code,
+ const char *msg, ...)
+{
+ va_list ap;
+ char msg_text[JSON_ERROR_TEXT_LENGTH];
+ char msg_with_context[JSON_ERROR_TEXT_LENGTH];
+
+ int line = -1, col = -1;
+ size_t pos = 0;
+ const char *result = msg_text;
+
+ if(!error)
+ return;
+
+ va_start(ap, msg);
+ vsnprintf(msg_text, JSON_ERROR_TEXT_LENGTH, msg, ap);
+ msg_text[JSON_ERROR_TEXT_LENGTH - 1] = '\0';
+ va_end(ap);
+
+ if(lex)
+ {
+ const char *saved_text = strbuffer_value(&lex->saved_text);
+
+ line = lex->stream.line;
+ col = lex->stream.column;
+ pos = lex->stream.position;
+
+ if(saved_text && saved_text[0])
+ {
+ if(lex->saved_text.length <= 20) {
+ snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH,
+ "%s near '%s'", msg_text, saved_text);
+ msg_with_context[JSON_ERROR_TEXT_LENGTH - 1] = '\0';
+ result = msg_with_context;
+ }
+ }
+ else
+ {
+ if(code == json_error_invalid_syntax) {
+ /* More specific error code for premature end of file. */
+ code = json_error_premature_end_of_input;
+ }
+ if(lex->stream.state == STREAM_STATE_ERROR) {
+ /* No context for UTF-8 decoding errors */
+ result = msg_text;
+ }
+ else {
+ snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH,
+ "%s near end of file", msg_text);
+ msg_with_context[JSON_ERROR_TEXT_LENGTH - 1] = '\0';
+ result = msg_with_context;
+ }
+ }
+ }
+
+ jsonp_error_set(error, line, col, pos, code, "%s", result);
+}
+
+
+/*** lexical analyzer ***/
+
+static void
+stream_init(stream_t *stream, get_func get, void *data)
+{
+ stream->get = get;
+ stream->data = data;
+ stream->buffer[0] = '\0';
+ stream->buffer_pos = 0;
+
+ stream->state = STREAM_STATE_OK;
+ stream->line = 1;
+ stream->column = 0;
+ stream->position = 0;
+}
+
+static int stream_get(stream_t *stream, json_error_t *error)
+{
+ int c;
+
+ if(stream->state != STREAM_STATE_OK)
+ return stream->state;
+
+ if(!stream->buffer[stream->buffer_pos])
+ {
+ c = stream->get(stream->data);
+ if(c == EOF) {
+ stream->state = STREAM_STATE_EOF;
+ return STREAM_STATE_EOF;
+ }
+
+ stream->buffer[0] = c;
+ stream->buffer_pos = 0;
+
+ if(0x80 <= c && c <= 0xFF)
+ {
+ /* multi-byte UTF-8 sequence */
+ size_t 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->buffer[count] = '\0';
+ }
+ else
+ stream->buffer[1] = '\0';
+ }
+
+ c = stream->buffer[stream->buffer_pos++];
+
+ stream->position++;
+ if(c == '\n') {
+ stream->line++;
+ stream->last_column = stream->column;
+ stream->column = 0;
+ }
+ else if(utf8_check_first(c)) {
+ /* track the Unicode character column, so increment only if
+ this is the first character of a UTF-8 sequence */
+ stream->column++;
+ }
+
+ return c;
+
+out:
+ stream->state = STREAM_STATE_ERROR;
+ error_set(error, stream_to_lex(stream), json_error_invalid_utf8, "unable to decode byte 0x%x", c);
+ return STREAM_STATE_ERROR;
+}
+
+static void stream_unget(stream_t *stream, int c)
+{
+ if(c == STREAM_STATE_EOF || c == STREAM_STATE_ERROR)
+ return;
+
+ stream->position--;
+ if(c == '\n') {
+ stream->line--;
+ stream->column = stream->last_column;
+ }
+ else if(utf8_check_first(c))
+ stream->column--;
+
+ 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 void lex_save(lex_t *lex, int c)
+{
+ strbuffer_append_byte(&lex->saved_text, c);
+}
+
+static int lex_get_save(lex_t *lex, json_error_t *error)
+{
+ int c = stream_get(&lex->stream, error);
+ if(c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR)
+ lex_save(lex, c);
+ return c;
+}
+
+static void lex_unget(lex_t *lex, int c)
+{
+ stream_unget(&lex->stream, c);
+}
+
+static void lex_unget_unsave(lex_t *lex, int c)
+{
+ if(c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR) {
+ /* Since we treat warnings as errors, when assertions are turned
+ * off the "d" variable would be set but never used. Which is
+ * treated as an error by GCC.
+ */
+ #ifndef NDEBUG
+ char d;
+ #endif
+ stream_unget(&lex->stream, c);
+ #ifndef NDEBUG
+ d =
+ #endif
+ 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++;
+ lex->stream.position++;
+ }
+}
+
+static void lex_free_string(lex_t *lex)
+{
+ jsonp_free(lex->value.string.val);
+ lex->value.string.val = NULL;
+ lex->value.string.len = 0;
+}
+
+/* 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(l_isdigit(c))
+ value += c - '0';
+ else if(l_islower(c))
+ value += c - 'a' + 10;
+ else if(l_isupper(c))
+ value += c - 'A' + 10;
+ else
+ return -1;
+ }
+
+ return value;
+}
+
+static void lex_scan_string(lex_t *lex, json_error_t *error)
+{
+ int c;
+ const char *p;
+ char *t;
+ int i;
+
+ lex->value.string.val = NULL;
+ lex->token = TOKEN_INVALID;
+
+ c = lex_get_save(lex, error);
+
+ while(c != '"') {
+ if(c == STREAM_STATE_ERROR)
+ goto out;
+
+ else if(c == STREAM_STATE_EOF) {
+ error_set(error, lex, json_error_premature_end_of_input, "premature end of input");
+ goto out;
+ }
+
+ else if(0 <= c && c <= 0x1F) {
+ /* control character */
+ lex_unget_unsave(lex, c);
+ if(c == '\n')
+ error_set(error, lex, json_error_invalid_syntax, "unexpected newline");
+ else
+ error_set(error, lex, json_error_invalid_syntax, "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(!l_isxdigit(c)) {
+ error_set(error, lex, json_error_invalid_syntax, "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 {
+ error_set(error, lex, json_error_invalid_syntax, "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
+ */
+ t = jsonp_malloc(lex->saved_text.length + 1);
+ if(!t) {
+ /* this is not very nice, since TOKEN_INVALID is returned */
+ goto out;
+ }
+ lex->value.string.val = t;
+
+ /* + 1 to skip the " */
+ p = strbuffer_value(&lex->saved_text) + 1;
+
+ while(*p != '"') {
+ if(*p == '\\') {
+ p++;
+ if(*p == 'u') {
+ size_t length;
+ int32_t value;
+
+ value = decode_unicode_escape(p);
+ if(value < 0) {
+ error_set(error, lex, json_error_invalid_syntax, "invalid Unicode escape '%.6s'", p - 1);
+ goto out;
+ }
+ p += 5;
+
+ if(0xD800 <= value && value <= 0xDBFF) {
+ /* surrogate pair */
+ if(*p == '\\' && *(p + 1) == 'u') {
+ int32_t value2 = decode_unicode_escape(++p);
+ if(value2 < 0) {
+ error_set(error, lex, json_error_invalid_syntax, "invalid Unicode escape '%.6s'", p - 1);
+ goto out;
+ }
+ 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,
+ json_error_invalid_syntax,
+ "invalid Unicode '\\u%04X\\u%04X'",
+ value, value2);
+ goto out;
+ }
+ }
+ else {
+ /* no second surrogate */
+ error_set(error, lex, json_error_invalid_syntax, "invalid Unicode '\\u%04X'",
+ value);
+ goto out;
+ }
+ }
+ else if(0xDC00 <= value && value <= 0xDFFF) {
+ error_set(error, lex, json_error_invalid_syntax, "invalid Unicode '\\u%04X'", value);
+ goto out;
+ }
+
+ if(utf8_encode(value, t, &length))
+ assert(0);
+ 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->value.string.len = t - lex->value.string.val;
+ lex->token = TOKEN_STRING;
+ return;
+
+out:
+ lex_free_string(lex);
+}
+
+#ifndef JANSSON_USING_CMAKE /* disabled if using cmake */
+#if JSON_INTEGER_IS_LONG_LONG
+#ifdef _MSC_VER /* Microsoft Visual Studio */
+#define json_strtoint _strtoi64
+#else
+#define json_strtoint strtoll
+#endif
+#else
+#define json_strtoint strtol
+#endif
+#endif
+
+static int lex_scan_number(lex_t *lex, int c, json_error_t *error)
+{
+ const char *saved_text;
+ char *end;
+ double doubleval;
+
+ lex->token = TOKEN_INVALID;
+
+ if(c == '-')
+ c = lex_get_save(lex, error);
+
+ if(c == '0') {
+ c = lex_get_save(lex, error);
+ if(l_isdigit(c)) {
+ lex_unget_unsave(lex, c);
+ goto out;
+ }
+ }
+ else if(l_isdigit(c)) {
+ do
+ c = lex_get_save(lex, error);
+ while(l_isdigit(c));
+ }
+ else {
+ lex_unget_unsave(lex, c);
+ goto out;
+ }
+
+ if(!(lex->flags & JSON_DECODE_INT_AS_REAL) &&
+ c != '.' && c != 'E' && c != 'e')
+ {
+ json_int_t intval;
+
+ lex_unget_unsave(lex, c);
+
+ saved_text = strbuffer_value(&lex->saved_text);
+
+ errno = 0;
+ intval = json_strtoint(saved_text, &end, 10);
+ if(errno == ERANGE) {
+ if(intval < 0)
+ error_set(error, lex, json_error_numeric_overflow, "too big negative integer");
+ else
+ error_set(error, lex, json_error_numeric_overflow, "too big integer");
+ goto out;
+ }
+
+ assert(end == saved_text + lex->saved_text.length);
+
+ lex->token = TOKEN_INTEGER;
+ lex->value.integer = intval;
+ return 0;
+ }
+
+ if(c == '.') {
+ c = lex_get(lex, error);
+ if(!l_isdigit(c)) {
+ lex_unget(lex, c);
+ goto out;
+ }
+ lex_save(lex, c);
+
+ do
+ c = lex_get_save(lex, error);
+ while(l_isdigit(c));
+ }
+
+ if(c == 'E' || c == 'e') {
+ c = lex_get_save(lex, error);
+ if(c == '+' || c == '-')
+ c = lex_get_save(lex, error);
+
+ if(!l_isdigit(c)) {
+ lex_unget_unsave(lex, c);
+ goto out;
+ }
+
+ do
+ c = lex_get_save(lex, error);
+ while(l_isdigit(c));
+ }
+
+ lex_unget_unsave(lex, c);
+
+ if(jsonp_strtod(&lex->saved_text, &doubleval)) {
+ error_set(error, lex, json_error_numeric_overflow, "real number overflow");
+ goto out;
+ }
+
+ lex->token = TOKEN_REAL;
+ lex->value.real = doubleval;
+ return 0;
+
+out:
+ return -1;
+}
+
+static int lex_scan(lex_t *lex, json_error_t *error)
+{
+ int c;
+
+ strbuffer_clear(&lex->saved_text);
+
+ if(lex->token == TOKEN_STRING)
+ lex_free_string(lex);
+
+ do
+ c = lex_get(lex, error);
+ while(c == ' ' || c == '\t' || c == '\n' || c == '\r');
+
+ if(c == STREAM_STATE_EOF) {
+ lex->token = TOKEN_EOF;
+ goto out;
+ }
+
+ if(c == STREAM_STATE_ERROR) {
+ 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(l_isdigit(c) || c == '-') {
+ if(lex_scan_number(lex, c, error))
+ goto out;
+ }
+
+ else if(l_isalpha(c)) {
+ /* eat up the whole identifier for clearer error messages */
+ const char *saved_text;
+
+ do
+ c = lex_get_save(lex, error);
+ while(l_isalpha(c));
+ 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, size_t *out_len)
+{
+ char *result = NULL;
+ if(lex->token == TOKEN_STRING) {
+ result = lex->value.string.val;
+ *out_len = lex->value.string.len;
+ lex->value.string.val = NULL;
+ lex->value.string.len = 0;
+ }
+ return result;
+}
+
+static int lex_init(lex_t *lex, get_func get, size_t flags, void *data)
+{
+ stream_init(&lex->stream, get, data);
+ if(strbuffer_init(&lex->saved_text))
+ return -1;
+
+ lex->flags = flags;
+ lex->token = TOKEN_INVALID;
+ return 0;
+}
+
+static void lex_close(lex_t *lex)
+{
+ if(lex->token == TOKEN_STRING)
+ lex_free_string(lex);
+ strbuffer_close(&lex->saved_text);
+}
+
+
+/*** parser ***/
+
+static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error);
+
+static json_t *parse_object(lex_t *lex, size_t flags, 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;
+ size_t len;
+ json_t *value;
+
+ if(lex->token != TOKEN_STRING) {
+ error_set(error, lex, json_error_invalid_syntax, "string or '}' expected");
+ goto error;
+ }
+
+ key = lex_steal_string(lex, &len);
+ if(!key)
+ return NULL;
+ if (memchr(key, '\0', len)) {
+ jsonp_free(key);
+ error_set(error, lex, json_error_null_byte_in_key, "NUL byte in object key not supported");
+ goto error;
+ }
+
+ if(flags & JSON_REJECT_DUPLICATES) {
+ if(json_object_get(object, key)) {
+ jsonp_free(key);
+ error_set(error, lex, json_error_duplicate_key, "duplicate object key");
+ goto error;
+ }
+ }
+
+ lex_scan(lex, error);
+ if(lex->token != ':') {
+ jsonp_free(key);
+ error_set(error, lex, json_error_invalid_syntax, "':' expected");
+ goto error;
+ }
+
+ lex_scan(lex, error);
+ value = parse_value(lex, flags, error);
+ if(!value) {
+ jsonp_free(key);
+ goto error;
+ }
+
+ if(json_object_set_new_nocheck(object, key, value)) {
+ jsonp_free(key);
+ goto error;
+ }
+
+ jsonp_free(key);
+
+ lex_scan(lex, error);
+ if(lex->token != ',')
+ break;
+
+ lex_scan(lex, error);
+ }
+
+ if(lex->token != '}') {
+ error_set(error, lex, json_error_invalid_syntax, "'}' expected");
+ goto error;
+ }
+
+ return object;
+
+error:
+ json_decref(object);
+ return NULL;
+}
+
+static json_t *parse_array(lex_t *lex, size_t flags, 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, flags, error);
+ if(!elem)
+ goto error;
+
+ if(json_array_append_new(array, elem)) {
+ goto error;
+ }
+
+ lex_scan(lex, error);
+ if(lex->token != ',')
+ break;
+
+ lex_scan(lex, error);
+ }
+
+ if(lex->token != ']') {
+ error_set(error, lex, json_error_invalid_syntax, "']' expected");
+ goto error;
+ }
+
+ return array;
+
+error:
+ json_decref(array);
+ return NULL;
+}
+
+static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error)
+{
+ json_t *json;
+
+ lex->depth++;
+ if(lex->depth > JSON_PARSER_MAX_DEPTH) {
+ error_set(error, lex, json_error_stack_overflow, "maximum parsing depth reached");
+ return NULL;
+ }
+
+ switch(lex->token) {
+ case TOKEN_STRING: {
+ const char *value = lex->value.string.val;
+ size_t len = lex->value.string.len;
+
+ if(!(flags & JSON_ALLOW_NUL)) {
+ if(memchr(value, '\0', len)) {
+ error_set(error, lex, json_error_null_character, "\\u0000 is not allowed without JSON_ALLOW_NUL");
+ return NULL;
+ }
+ }
+
+ json = jsonp_stringn_nocheck_own(value, len);
+ if(json) {
+ lex->value.string.val = NULL;
+ lex->value.string.len = 0;
+ }
+ 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, flags, error);
+ break;
+
+ case '[':
+ json = parse_array(lex, flags, error);
+ break;
+
+ case TOKEN_INVALID:
+ error_set(error, lex, json_error_invalid_syntax, "invalid token");
+ return NULL;
+
+ default:
+ error_set(error, lex, json_error_invalid_syntax, "unexpected token");
+ return NULL;
+ }
+
+ if(!json)
+ return NULL;
+
+ lex->depth--;
+ return json;
+}
+
+static json_t *parse_json(lex_t *lex, size_t flags, json_error_t *error)
+{
+ json_t *result;
+
+ lex->depth = 0;
+
+ lex_scan(lex, error);
+ if(!(flags & JSON_DECODE_ANY)) {
+ if(lex->token != '[' && lex->token != '{') {
+ error_set(error, lex, json_error_invalid_syntax, "'[' or '{' expected");
+ return NULL;
+ }
+ }
+
+ result = parse_value(lex, flags, error);
+ if(!result)
+ return NULL;
+
+ if(!(flags & JSON_DISABLE_EOF_CHECK)) {
+ lex_scan(lex, error);
+ if(lex->token != TOKEN_EOF) {
+ error_set(error, lex, json_error_end_of_input_expected, "end of file expected");
+ json_decref(result);
+ return NULL;
+ }
+ }
+
+ if(error) {
+ /* Save the position even though there was no error */
+ error->position = (int)lex->stream.position;
+ }
+
+ return result;
+}
+
+typedef struct
+{
+ const char *data;
+ size_t 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 (unsigned char)c;
+ }
+}
+
+json_t *json_loads(const char *string, size_t flags, json_error_t *error)
+{
+ lex_t lex;
+ json_t *result;
+ string_data_t stream_data;
+
+ jsonp_error_init(error, "<string>");
+
+ if (string == NULL) {
+ error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
+ return NULL;
+ }
+
+ stream_data.data = string;
+ stream_data.pos = 0;
+
+ if(lex_init(&lex, string_get, flags, (void *)&stream_data))
+ return NULL;
+
+ result = parse_json(&lex, flags, error);
+
+ lex_close(&lex);
+ return result;
+}
+
+typedef struct
+{
+ const char *data;
+ size_t len;
+ size_t pos;
+} buffer_data_t;
+
+static int buffer_get(void *data)
+{
+ char c;
+ buffer_data_t *stream = data;
+ if(stream->pos >= stream->len)
+ return EOF;
+
+ c = stream->data[stream->pos];
+ stream->pos++;
+ return (unsigned char)c;
+}
+
+json_t *json_loadb(const char *buffer, size_t buflen, size_t flags, json_error_t *error)
+{
+ lex_t lex;
+ json_t *result;
+ buffer_data_t stream_data;
+
+ jsonp_error_init(error, "<buffer>");
+
+ if (buffer == NULL) {
+ error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
+ return NULL;
+ }
+
+ stream_data.data = buffer;
+ stream_data.pos = 0;
+ stream_data.len = buflen;
+
+ if(lex_init(&lex, buffer_get, flags, (void *)&stream_data))
+ return NULL;
+
+ result = parse_json(&lex, flags, error);
+
+ lex_close(&lex);
+ return result;
+}
+
+json_t *json_loadf(FILE *input, size_t flags, json_error_t *error)
+{
+ lex_t lex;
+ const char *source;
+ json_t *result;
+
+ if(input == stdin)
+ source = "<stdin>";
+ else
+ source = "<stream>";
+
+ jsonp_error_init(error, source);
+
+ if (input == NULL) {
+ error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
+ return NULL;
+ }
+
+ if(lex_init(&lex, (get_func)fgetc, flags, input))
+ return NULL;
+
+ result = parse_json(&lex, flags, error);
+
+ lex_close(&lex);
+ return result;
+}
+
+static int fd_get_func(int *fd)
+{
+ uint8_t c;
+#ifdef HAVE_UNISTD_H
+ if (read(*fd, &c, 1) == 1)
+ return c;
+#endif
+ return EOF;
+}
+
+json_t *json_loadfd(int input, size_t flags, json_error_t *error)
+{
+ lex_t lex;
+ const char *source;
+ json_t *result;
+
+#ifdef HAVE_UNISTD_H
+ if(input == STDIN_FILENO)
+ source = "<stdin>";
+ else
+#endif
+ source = "<stream>";
+
+ jsonp_error_init(error, source);
+
+ if (input < 0) {
+ error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
+ return NULL;
+ }
+
+ if(lex_init(&lex, (get_func)fd_get_func, flags, &input))
+ return NULL;
+
+ result = parse_json(&lex, flags, error);
+
+ lex_close(&lex);
+ return result;
+}
+
+json_t *json_load_file(const char *path, size_t flags, json_error_t *error)
+{
+ json_t *result;
+ FILE *fp;
+
+ jsonp_error_init(error, path);
+
+ if (path == NULL) {
+ error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
+ return NULL;
+ }
+
+ fp = fopen(path, "rb");
+ if(!fp)
+ {
+ error_set(error, NULL, json_error_cannot_open_file, "unable to open %s: %s",
+ path, strerror(errno));
+ return NULL;
+ }
+
+ result = json_loadf(fp, flags, error);
+
+ fclose(fp);
+ return result;
+}
+
+#define MAX_BUF_LEN 1024
+
+typedef struct
+{
+ char data[MAX_BUF_LEN];
+ size_t len;
+ size_t pos;
+ json_load_callback_t callback;
+ void *arg;
+} callback_data_t;
+
+static int callback_get(void *data)
+{
+ char c;
+ callback_data_t *stream = data;
+
+ if(stream->pos >= stream->len) {
+ stream->pos = 0;
+ stream->len = stream->callback(stream->data, MAX_BUF_LEN, stream->arg);
+ if(stream->len == 0 || stream->len == (size_t)-1)
+ return EOF;
+ }
+
+ c = stream->data[stream->pos];
+ stream->pos++;
+ return (unsigned char)c;
+}
+
+json_t *json_load_callback(json_load_callback_t callback, void *arg, size_t flags, json_error_t *error)
+{
+ lex_t lex;
+ json_t *result;
+
+ callback_data_t stream_data;
+
+ memset(&stream_data, 0, sizeof(stream_data));
+ stream_data.callback = callback;
+ stream_data.arg = arg;
+
+ jsonp_error_init(error, "<callback>");
+
+ if (callback == NULL) {
+ error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
+ return NULL;
+ }
+
+ if(lex_init(&lex, (get_func)callback_get, flags, &stream_data))
+ return NULL;
+
+ result = parse_json(&lex, flags, error);
+
+ lex_close(&lex);
+ return result;
+}
projects / proxmark3-svn / commitdiff