Cloning a bunch of stuff from the native_client repository at r6528

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.cc

Index: ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.cc
===================================================================
--- ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.cc	(revision 0)
+++ ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.cc	(revision 0)
@@ -0,0 +1,199 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "native_client/src/shared/ppapi_proxy/plugin_ppb_var.h"
+
+#include <stdio.h>
+
+#include <string>
+#include <utility>
+
+#include "native_client/src/include/checked_cast.h"
+#include "native_client/src/include/nacl_macros.h"
+#include "native_client/src/include/portability.h"
+#include "native_client/src/include/portability_io.h"
+#include "native_client/src/shared/ppapi_proxy/proxy_var_cache.h"
+#include "native_client/src/shared/ppapi_proxy/string_proxy_var.h"
+#include "native_client/src/shared/ppapi_proxy/utility.h"
+#include "ppapi/c/pp_var.h"
+#include "ppapi/c/ppb_var.h"
+
+namespace ppapi_proxy {
+
+namespace {
+
+void AddRef(PP_Var var) {
+  DebugPrintf("PPB_Var::AddRef: var=PPB_Var(%s)\n",
+              PluginVar::DebugString(var).c_str());
+  ProxyVarCache::GetInstance().RetainProxyVar(var);
+}
+
+void Release(PP_Var var) {
+  DebugPrintf("PPB_Var::Release: var=PPB_Var(%s)\n",
+              PluginVar::DebugString(var).c_str());
+  ProxyVarCache::GetInstance().ReleaseProxyVar(var);
+}
+
+PP_Var VarFromUtf8(PP_Module module_id, const char* data, uint32_t len) {
+  DebugPrintf("PPB_Var::VarFromUtf8: data='%.*s'\n", len, data);
+  UNREFERENCED_PARAMETER(module_id);
+  if (!StringIsUtf8(data, len)) {
+    DebugPrintf("PPB_Var::VarFromUtf8: not UTF8\n");
+    return PP_MakeNull();
+  }
+  SharedProxyVar proxy_var(new StringProxyVar(data, len));
+  ProxyVarCache::GetInstance().RetainSharedProxyVar(proxy_var);
+  PP_Var var;
+  var.type = PP_VARTYPE_STRING;
+  var.value.as_id = proxy_var->id();
+  // Increment the reference count for the return to the caller.
+  AddRef(var);
+  DebugPrintf("PPB_Var::VarFromUtf8: as_id=%"NACL_PRId64"\n", var.value.as_id);
+  return var;
+}
+
+const char* VarToUtf8(PP_Var var, uint32_t* len) {
+  DebugPrintf("PPB_Var::VarToUtf8: as_id=%"NACL_PRId64"\n", var.value.as_id);
+  SharedStringProxyVar string_var = StringProxyVar::CastFromProxyVar(
+      ProxyVarCache::GetInstance().SharedProxyVarForVar(var));
+  const char* data = NULL;
+  if (string_var == NULL) {
+    *len = 0;
+  } else {
+    *len = static_cast<uint32_t>(string_var->contents().size());
+    // Mimics PPAPI implementation: as long as SharedStringProxyVar is alive,
+    // the return value can be validly used.
+    data = string_var->contents().c_str();
+  }
+  DebugPrintf("PPB_Var::VarToUtf8: data='%.*s'\n", *len, data);
+  return data;
+}
+
+int64_t GetVarId(PP_Var var) {
+  SharedProxyVar proxy_var =
+      ProxyVarCache::GetInstance().SharedProxyVarForVar(var);
+  if (proxy_var == NULL) {
+    return -1;
+  } else {
+    return proxy_var->id();
+  }
+}
+
+}  // namespace
+
+const PPB_Var* PluginVar::GetInterface() {
+  static const PPB_Var var_interface = {
+    AddRef,
+    Release,
+    VarFromUtf8,
+    VarToUtf8
+  };
+  return &var_interface;
+}
+
+std::string PluginVar::DebugString(const PP_Var& var) {
+  switch (var.type) {
+    case PP_VARTYPE_UNDEFINED:
+      return "##UNDEFINED##";
+    case PP_VARTYPE_NULL:
+      return "##NULL##";
+    case PP_VARTYPE_BOOL:
+      return (var.value.as_bool ? "true" : "false");
+    case PP_VARTYPE_INT32:
+      {
+        char buf[32];
+        const size_t kBufSize = sizeof(buf);
+        SNPRINTF(buf, kBufSize, "%d", static_cast<int>(var.value.as_int));
+        return buf;
+      }
+    case PP_VARTYPE_DOUBLE:
+      {
+        char buf[32];
+        const size_t kBufSize = sizeof(buf);
+        SNPRINTF(buf, kBufSize, "%f", var.value.as_double);
+        return buf;
+      }
+    case PP_VARTYPE_STRING:
+      {
+        uint32_t len;
+        const char* data = VarToUtf8(var, &len);
+        return std::string(data, len);
+      }
+    case PP_VARTYPE_OBJECT:
+      {
+        char buf[32];
+        const size_t kBufSize = sizeof(buf);
+        SNPRINTF(buf, kBufSize, "%"NACL_PRIu64"", GetVarId(var));
+        return std::string("##OBJECT##") + buf + "##";
+      }
+    case PP_VARTYPE_ARRAY:
+    case PP_VARTYPE_DICTIONARY:
+      NACL_NOTREACHED();
+      break;
+  }
+  ASSERT_MSG(0, "Unexpected type seen");
+  return "##ERROR##";
+}
+
+PP_Var PluginVar::StringToPPVar(PP_Module module_id, const std::string& str) {
+  static const PPB_Var* ppb_var = NULL;
+  if (ppb_var == NULL) {
+    ppb_var = static_cast<const PPB_Var*>(
+        ppapi_proxy::PluginVar::GetInterface());
+  }
+  if (ppb_var == NULL) {
+    return PP_MakeUndefined();
+  }
+  return ppb_var->VarFromUtf8(
+      module_id, str.c_str(), nacl::assert_cast<uint32_t>(str.size()));
+}
+
+std::string PluginVar::PPVarToString(const PP_Var& var) {
+  static const PPB_Var* ppb_var = NULL;
+  if (ppb_var == NULL) {
+    ppb_var = static_cast<const PPB_Var*>(
+        ppapi_proxy::PluginVar::GetInterface());
+  }
+  if (ppb_var == NULL || var.type != PP_VARTYPE_STRING) {
+    return "";
+  }
+  uint32_t len;
+  return ppb_var->VarToUtf8(var, &len);
+}
+
+void PluginVar::Print(const PP_Var& var) {
+  switch (var.type) {
+    case PP_VARTYPE_UNDEFINED:
+      DebugPrintf("PP_Var(undefined)");
+      break;
+    case PP_VARTYPE_NULL:
+      DebugPrintf("PP_Var(null)");
+      break;
+    case PP_VARTYPE_BOOL:
+      DebugPrintf("PP_Var(bool: %s)", var.value.as_bool ? "true" : "false");
+      break;
+    case PP_VARTYPE_INT32:
+      DebugPrintf("PP_Var(int32: %"NACL_PRId32")", var.value.as_int);
+      break;
+    case PP_VARTYPE_DOUBLE:
+      DebugPrintf("PP_Var(double: %f)", var.value.as_double);
+      break;
+    case PP_VARTYPE_STRING:
+      {
+        std::string str = DebugString(var);
+        DebugPrintf("PP_Var(string: '%*s')",
+                    static_cast<uint32_t>(str.size()),
+                    str.c_str());
+      }
+    case PP_VARTYPE_OBJECT:
+      DebugPrintf("PP_Var(object: %"NACL_PRIu64")", GetVarId(var));
+      break;
+    case PP_VARTYPE_ARRAY:
+    case PP_VARTYPE_DICTIONARY:
+      NACL_NOTREACHED();
+      break;
+  }
+}
+
+}  // namespace ppapi_proxy