int dom_null(JSAXContextRef ctxt)
{
DomInfo *data = getDOMContext(ctxt);
// no handle to the context
CHECK_CONDITION_RETURN_VALUE(data == NULL, 0, "null encountered without any context");
// no parent node
CHECK_CONDITION_RETURN_VALUE(data->m_prev == NULL, 0, "unexpected state - how is this possible?");
SANITY_CHECK_POINTER(ctxt);
SANITY_CHECK_POINTER(data->m_prev);
if (data->m_value == NULL) {
CHECK_CONDITION_RETURN_VALUE(!jis_array(data->m_prev->m_value), 0, "Improper place for null");
jarray_append(data->m_prev->m_value, jnull());
} else if (jis_string(data->m_value)) {
CHECK_CONDITION_RETURN_VALUE(!jis_object(data->m_prev->m_value), 0, "Improper place for null");
jobject_put(data->m_prev->m_value, data->m_value, jnull());
data->m_value = NULL;
} else {
PJ_LOG_ERR("PBNJSON_NULL_VALUE_WO_KEY", 0, "value portion of key-value pair without a key");
return 0;
}
return 1;
}
jvalue_ref jdom_parse_file(const char *file, JSchemaInfoRef schemaInfo, JFileOptimizationFlags flags)
{
CHECK_POINTER_RETURN_NULL(file);
CHECK_POINTER_RETURN_NULL(schemaInfo);
int fd;
off_t fileSize;
raw_buffer input = { 0 };
jvalue_ref result;
char *err_msg;
fd = open(file, O_RDONLY);
if (fd == -1) {
goto errno_parse_failure;
}
if (!file_size(fd, &fileSize)) {
goto errno_parse_failure;
}
input.m_len = fileSize;
if (input.m_len != fileSize) {
PJ_LOG_ERR("File too big - currently unsupported by this API");
close(fd);
}
if (flags & JFileOptMMap) {
input.m_str = (char *)mmap(NULL, input.m_len, PROT_READ, MAP_PRIVATE | MAP_NORESERVE, fd, 0);
if (input.m_str == NULL || input.m_str == MAP_FAILED) {
goto errno_parse_failure;
}
} else {
input.m_str = (char *)malloc(input.m_len + 1);
if (input.m_len != read(fd, (char *)input.m_str, input.m_len)) {
goto errno_parse_failure;
}
((char *)input.m_str)[input.m_len] = 0;
}
result = jdom_parse(input, DOMOPT_INPUT_OUTLIVES_WITH_NOCHANGE, schemaInfo);
return_result:
close(fd);
if (UNLIKELY(jis_null(result))) {
if (input.m_str) {
if (flags & JFileOptMMap) {
munmap((void *)input.m_str, input.m_len);
} else {
free((void *)input.m_str);
}
}
} else {
result->m_backingBuffer = input;
result->m_backingBufferMMap = flags & JFileOptMMap;
}
return result;
errno_parse_failure:
err_msg = strdup(strerror(errno));
PJ_LOG_WARN("Attempt to parse json document '%s' failed (%d) : %s", file, errno, err_msg);
free(err_msg);
result = jnull();
goto return_result;
}
jvalue_ref jdom_parse_ex(raw_buffer input, JDOMOptimizationFlags optimizationMode, JSchemaInfoRef schemaInfo, bool allowComments)
{
jvalue_ref result;
PJSAXCallbacks callbacks = {
dom_object_start, // m_objStart
dom_object_key, // m_objKey
dom_object_end, // m_objEnd
dom_array_start, // m_arrStart
dom_array_end, // m_arrEnd
dom_string, // m_string
dom_number, // m_number
dom_boolean, // m_boolean
dom_null, // m_null
};
DomInfo *topLevelContext = calloc(1, sizeof(struct DomInfo));
CHECK_POINTER_RETURN_NULL(topLevelContext);
void *domCtxt = topLevelContext;
bool parsedOK = jsax_parse_internal(&callbacks, input, schemaInfo, &domCtxt, false /* don't log errors*/, allowComments);
result = topLevelContext->m_value;
if (domCtxt != topLevelContext) {
// unbalanced state machine (probably a result of parser failure)
// cleanup so there's no memory leak
PJ_LOG_ERR("state machine indicates invalid input");
parsedOK = false;
DomInfo *ctxt = domCtxt;
DomInfo *parentCtxt;
while (ctxt) {
#ifdef _DEBUG
if (ctxt == topLevelContext) {
assert(ctxt->m_prev == NULL);
} else {
assert(ctxt->m_prev != NULL);
}
#endif
parentCtxt = ctxt->m_prev;
// top-level json value can only be an object or array,
// thus we do not need to check that we aren't releasing topLevelContext->m_value.
// the only other object type that m_value will contain is string (representing the key of an object).
//if (ctxt->m_value && !jis_array(ctxt->m_value) && !jis_object(ctxt->m_value)) {
if (ctxt->m_value && jis_string(ctxt->m_value)) {
j_release(&ctxt->m_value);
}
free(ctxt);
ctxt = parentCtxt;
}
topLevelContext = NULL;
}
free(topLevelContext);
if (!parsedOK) {
PJ_LOG_ERR("Parser failure");
j_release(&result);
return jnull();
}
if (result == NULL)
PJ_LOG_ERR("result was NULL - unexpected. input was '%.*s'", (int)input.m_len, input.m_str);
else if (result == jnull())
PJ_LOG_WARN("result was NULL JSON - unexpected. input was '%.*s'", (int)input.m_len, input.m_str);
else {
if ((optimizationMode & (DOMOPT_INPUT_NOCHANGE | DOMOPT_INPUT_OUTLIVES_DOM | DOMOPT_INPUT_NULL_TERMINATED)) && input.m_str[input.m_len] == '\0') {
result->m_toString = (char *)input.m_str;
result->m_toStringDealloc = NULL;
}
}
return result;
}
