1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "ppapi/cpp/var.h"
12 #include "ppapi/c/pp_var.h"
13 #include "ppapi/c/ppb_var.h"
14 #include "ppapi/cpp/instance.h"
15 #include "ppapi/cpp/logging.h"
16 #include "ppapi/cpp/module.h"
17 #include "ppapi/cpp/module_impl.h"
19 // Define equivalent to snprintf on Windows.
21 # define snprintf sprintf_s
28 template <> const char* interface_name<PPB_Var_1_2>() {
29 return PPB_VAR_INTERFACE_1_2;
31 template <> const char* interface_name<PPB_Var_1_1>() {
32 return PPB_VAR_INTERFACE_1_1;
34 template <> const char* interface_name<PPB_Var_1_0>() {
35 return PPB_VAR_INTERFACE_1_0;
38 // Technically you can call AddRef and Release on any Var, but it may involve
39 // cross-process calls depending on the plugin. This is an optimization so we
40 // only do refcounting on the necessary objects.
41 inline bool NeedsRefcounting(const PP_Var& var) {
42 return var.type > PP_VARTYPE_DOUBLE;
45 // This helper function uses the latest available version of VarFromUtf8. Note
46 // that version 1.0 of this method has a different API to later versions.
47 PP_Var VarFromUtf8Helper(const char* utf8_str, uint32_t len) {
48 if (has_interface<PPB_Var_1_2>()) {
49 return get_interface<PPB_Var_1_2>()->VarFromUtf8(utf8_str, len);
50 } else if (has_interface<PPB_Var_1_1>()) {
51 return get_interface<PPB_Var_1_1>()->VarFromUtf8(utf8_str, len);
52 } else if (has_interface<PPB_Var_1_0>()) {
53 return get_interface<PPB_Var_1_0>()->VarFromUtf8(Module::Get()->pp_module(),
60 // This helper function uses the latest available version of AddRef.
61 // Returns true on success, false if no appropriate interface was available.
62 bool AddRefHelper(const PP_Var& var) {
63 if (has_interface<PPB_Var_1_2>()) {
64 get_interface<PPB_Var_1_2>()->AddRef(var);
66 } else if (has_interface<PPB_Var_1_1>()) {
67 get_interface<PPB_Var_1_1>()->AddRef(var);
69 } else if (has_interface<PPB_Var_1_0>()) {
70 get_interface<PPB_Var_1_0>()->AddRef(var);
76 // This helper function uses the latest available version of Release.
77 // Returns true on success, false if no appropriate interface was available.
78 bool ReleaseHelper(const PP_Var& var) {
79 if (has_interface<PPB_Var_1_2>()) {
80 get_interface<PPB_Var_1_2>()->Release(var);
82 } else if (has_interface<PPB_Var_1_1>()) {
83 get_interface<PPB_Var_1_1>()->Release(var);
85 } else if (has_interface<PPB_Var_1_0>()) {
86 get_interface<PPB_Var_1_0>()->Release(var);
95 memset(&var_, 0, sizeof(var_));
96 var_.type = PP_VARTYPE_UNDEFINED;
101 memset(&var_, 0, sizeof(var_));
102 var_.type = PP_VARTYPE_NULL;
107 var_.type = PP_VARTYPE_BOOL;
109 var_.value.as_bool = PP_FromBool(b);
113 Var::Var(int32_t i) {
114 var_.type = PP_VARTYPE_INT32;
116 var_.value.as_int = i;
121 var_.type = PP_VARTYPE_DOUBLE;
123 var_.value.as_double = d;
127 Var::Var(const char* utf8_str) {
128 uint32_t len = utf8_str ? static_cast<uint32_t>(strlen(utf8_str)) : 0;
129 var_ = VarFromUtf8Helper(utf8_str, len);
133 Var::Var(const std::string& utf8_str) {
134 var_ = VarFromUtf8Helper(utf8_str.c_str(),
135 static_cast<uint32_t>(utf8_str.size()));
139 Var::Var(const pp::Resource& resource) {
140 if (has_interface<PPB_Var_1_2>()) {
141 var_ = get_interface<PPB_Var_1_2>()->VarFromResource(
142 resource.pp_resource());
147 // Set |is_managed_| to true, so |var_| will be properly released upon
153 Var::Var(const PP_Var& var) {
156 if (NeedsRefcounting(var_)) {
157 if (!AddRefHelper(var_))
158 var_.type = PP_VARTYPE_NULL;
162 Var::Var(const Var& other) {
165 if (NeedsRefcounting(var_)) {
166 if (!AddRefHelper(var_))
167 var_.type = PP_VARTYPE_NULL;
172 if (NeedsRefcounting(var_) && is_managed_)
176 Var& Var::operator=(const Var& other) {
177 // Early return for self-assignment. Note however, that two distinct vars
178 // can refer to the same object, so we still need to be careful about the
179 // refcounting below.
183 // Be careful to keep the ref alive for cases where we're assigning an
184 // object to itself by addrefing the new one before releasing the old one.
185 bool old_is_managed = is_managed_;
187 if (NeedsRefcounting(other.var_)) {
188 AddRefHelper(other.var_);
190 if (NeedsRefcounting(var_) && old_is_managed)
197 bool Var::operator==(const Var& other) const {
198 if (var_.type != other.var_.type)
201 case PP_VARTYPE_UNDEFINED:
202 case PP_VARTYPE_NULL:
204 case PP_VARTYPE_BOOL:
205 return AsBool() == other.AsBool();
206 case PP_VARTYPE_INT32:
207 return AsInt() == other.AsInt();
208 case PP_VARTYPE_DOUBLE:
209 return AsDouble() == other.AsDouble();
210 case PP_VARTYPE_STRING:
211 if (var_.value.as_id == other.var_.value.as_id)
213 return AsString() == other.AsString();
214 case PP_VARTYPE_OBJECT:
215 case PP_VARTYPE_ARRAY:
216 case PP_VARTYPE_ARRAY_BUFFER:
217 case PP_VARTYPE_DICTIONARY:
218 case PP_VARTYPE_RESOURCE:
219 default: // Objects, arrays, dictionaries, resources.
220 return var_.value.as_id == other.var_.value.as_id;
224 bool Var::AsBool() const {
229 return PP_ToBool(var_.value.as_bool);
232 int32_t Var::AsInt() const {
234 return var_.value.as_int;
236 return static_cast<int>(var_.value.as_double);
241 double Var::AsDouble() const {
243 return var_.value.as_double;
245 return static_cast<double>(var_.value.as_int);
250 std::string Var::AsString() const {
253 return std::string();
258 if (has_interface<PPB_Var_1_2>())
259 str = get_interface<PPB_Var_1_2>()->VarToUtf8(var_, &len);
260 else if (has_interface<PPB_Var_1_1>())
261 str = get_interface<PPB_Var_1_1>()->VarToUtf8(var_, &len);
262 else if (has_interface<PPB_Var_1_0>())
263 str = get_interface<PPB_Var_1_0>()->VarToUtf8(var_, &len);
265 return std::string();
266 return std::string(str, len);
269 pp::Resource Var::AsResource() const {
270 if (!is_resource()) {
272 return pp::Resource();
275 if (has_interface<PPB_Var_1_2>()) {
276 return pp::Resource(pp::PASS_REF,
277 get_interface<PPB_Var_1_2>()->VarToResource(var_));
279 return pp::Resource();
283 std::string Var::DebugString() const {
285 if (is_undefined()) {
286 snprintf(buf, sizeof(buf), "Var(UNDEFINED)");
287 } else if (is_null()) {
288 snprintf(buf, sizeof(buf), "Var(NULL)");
289 } else if (is_bool()) {
290 snprintf(buf, sizeof(buf), AsBool() ? "Var(true)" : "Var(false)");
291 } else if (is_int()) {
292 snprintf(buf, sizeof(buf), "Var(%d)", static_cast<int>(AsInt()));
293 } else if (is_double()) {
294 snprintf(buf, sizeof(buf), "Var(%f)", AsDouble());
295 } else if (is_string()) {
296 char format[] = "Var<'%s'>";
297 size_t decoration = sizeof(format) - 2; // The %s is removed.
298 size_t available = sizeof(buf) - decoration;
299 std::string str = AsString();
300 if (str.length() > available) {
301 str.resize(available - 3); // Reserve space for ellipsis.
304 snprintf(buf, sizeof(buf), format, str.c_str());
305 } else if (is_object()) {
306 snprintf(buf, sizeof(buf), "Var(OBJECT)");
307 } else if (is_array()) {
308 snprintf(buf, sizeof(buf), "Var(ARRAY)");
309 } else if (is_dictionary()) {
310 snprintf(buf, sizeof(buf), "Var(DICTIONARY)");
311 } else if (is_array_buffer()) {
312 snprintf(buf, sizeof(buf), "Var(ARRAY_BUFFER)");
313 } else if (is_resource()) {
314 snprintf(buf, sizeof(buf), "Var(RESOURCE)");