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ovsdb-data: New functions for predicting serialized length of data.

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These will be used for the first time in an upcoming commit.

Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2013-03-27 09:32:56 -07:00
parent 1600fa6853
commit 0ea7bec76d
3 changed files with 108 additions and 5 deletions
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93
lib/ovsdb-data.c
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@@ -1,4 +1,4 @@
/* Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
/* Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -466,6 +466,47 @@ ovsdb_atom_to_json(const union ovsdb_atom *atom, enum ovsdb_atomic_type type)
}
}
/* Returns strlen(json_to_string(ovsdb_atom_to_json(atom, type), 0)). */
size_t
ovsdb_atom_json_length(const union ovsdb_atom *atom,
enum ovsdb_atomic_type type)
{
struct json json;
switch (type) {
case OVSDB_TYPE_VOID:
NOT_REACHED();
case OVSDB_TYPE_INTEGER:
json.type = JSON_INTEGER;
json.u.integer = atom->integer;
break;
case OVSDB_TYPE_REAL:
json.type = JSON_REAL;
json.u.real = atom->real;
break;
case OVSDB_TYPE_BOOLEAN:
json.type = atom->boolean ? JSON_TRUE : JSON_FALSE;
break;
case OVSDB_TYPE_STRING:
json.type = JSON_STRING;
json.u.string = atom->string;
break;
case OVSDB_TYPE_UUID:
return strlen("[\"uuid\",\"00000000-0000-0000-0000-000000000000\"]");
case OVSDB_N_TYPES:
default:
NOT_REACHED();
}
return json_serialized_length(&json);
}
static char *
ovsdb_atom_from_string__(union ovsdb_atom *atom,
const struct ovsdb_base_type *base, const char *s,
@@ -1307,6 +1348,56 @@ ovsdb_datum_to_json(const struct ovsdb_datum *datum,
}
}
/* Returns strlen(json_to_string(ovsdb_datum_to_json(datum, type), 0)). */
size_t
ovsdb_datum_json_length(const struct ovsdb_datum *datum,
const struct ovsdb_type *type)
{
if (ovsdb_type_is_map(type)) {
size_t length;
/* ["map",[...]]. */
length = 10;
if (datum->n > 0) {
size_t i;
/* Commas between pairs in the inner [...] */
length += datum->n - 1;
/* [,] in each pair. */
length += datum->n * 3;
/* Data. */
for (i = 0; i < datum->n; i++) {
length += ovsdb_atom_json_length(&datum->keys[i],
type->key.type);
length += ovsdb_atom_json_length(&datum->values[i],
type->value.type);
}
}
return length;
} else if (datum->n == 1) {
return ovsdb_atom_json_length(&datum->keys[0], type->key.type);
} else {
size_t length;
size_t i;
/* ["set",[...]]. */
length = 10;
if (datum->n > 0) {
/* Commas between elements in the inner [...]. */
length += datum->n - 1;
/* Data. */
for (i = 0; i < datum->n; i++) {
length += ovsdb_atom_json_length(&datum->keys[i],
type->key.type);
}
}
return length;
}
}
static const char *
skip_spaces(const char *p)
{