components/nacl/renderer/plugin/srpc_params.cc

   1 /*
   2  * Copyright (c) 2012 The Chromium Authors. All rights reserved.
   3  * Use of this source code is governed by a BSD-style license that can be
   4  * found in the LICENSE file.
   5  */
   6
   7
   8 #include "components/nacl/renderer/plugin/srpc_params.h"
   9
  10 #include <stdlib.h>
  11
  12 #include "native_client/src/shared/srpc/nacl_srpc.h"
  13
  14
  15 namespace plugin {
  16
  17 namespace {
  18
  19 bool FillVec(NaClSrpcArg* vec[], const char* types) {
  20   const size_t kLength = strlen(types);
  21   if (kLength > NACL_SRPC_MAX_ARGS) {
  22     return false;
  23   }
  24   // We use malloc/new here rather than new/delete, because the SRPC layer
  25   // is written in C and hence will use malloc/free.
  26   // This array will get deallocated by FreeArguments().
  27   if (kLength > 0) {
  28     NaClSrpcArg* args =
  29       reinterpret_cast<NaClSrpcArg*>(malloc(kLength * sizeof(*args)));
  30     if (NULL == args) {
  31       return false;
  32     }
  33
  34     memset(static_cast<void*>(args), 0, kLength * sizeof(*args));
  35     for (size_t i = 0; i < kLength; ++i) {
  36       vec[i] = &args[i];
  37       args[i].tag = static_cast<NaClSrpcArgType>(types[i]);
  38     }
  39   }
  40   vec[kLength] = NULL;
  41   return true;
  42 }
  43
  44 void FreeSrpcArg(NaClSrpcArg* arg) {
  45   switch (arg->tag) {
  46     case NACL_SRPC_ARG_TYPE_CHAR_ARRAY:
  47       free(arg->arrays.carr);
  48       break;
  49     case NACL_SRPC_ARG_TYPE_DOUBLE_ARRAY:
  50       free(arg->arrays.darr);
  51       break;
  52     case NACL_SRPC_ARG_TYPE_HANDLE:
  53       break;
  54     case NACL_SRPC_ARG_TYPE_INT_ARRAY:
  55       free(arg->arrays.iarr);
  56       break;
  57     case NACL_SRPC_ARG_TYPE_LONG_ARRAY:
  58       free(arg->arrays.larr);
  59       break;
  60     case NACL_SRPC_ARG_TYPE_STRING:
  61       // All strings that are passed in SrpcArg must be allocated using
  62       // malloc! We cannot use browser's allocation API
  63       // since some of SRPC arguments is handled outside of the plugin code.
  64       free(arg->arrays.str);
  65       break;
  66     case NACL_SRPC_ARG_TYPE_VARIANT_ARRAY:
  67       if (arg->arrays.varr) {
  68         for (uint32_t i = 0; i < arg->u.count; i++) {
  69           FreeSrpcArg(&arg->arrays.varr[i]);
  70         }
  71       }
  72       break;
  73     case NACL_SRPC_ARG_TYPE_OBJECT:
  74       // This is a pointer to a scriptable object and should be released
  75       // by the browser
  76       break;
  77     case NACL_SRPC_ARG_TYPE_BOOL:
  78     case NACL_SRPC_ARG_TYPE_DOUBLE:
  79     case NACL_SRPC_ARG_TYPE_INT:
  80     case NACL_SRPC_ARG_TYPE_LONG:
  81     case NACL_SRPC_ARG_TYPE_INVALID:
  82     default:
  83       break;
  84   }
  85 }
  86
  87 void FreeArguments(NaClSrpcArg* vec[]) {
  88   if (NULL == vec[0]) {
  89     return;
  90   }
  91   for (NaClSrpcArg** argp = vec; *argp; ++argp) {
  92     FreeSrpcArg(*argp);
  93   }
  94   // Free the vector containing the arguments themselves that was
  95   // allocated with FillVec().
  96   free(vec[0]);
  97 }
  98
  99 }  // namespace
 100
 101 bool SrpcParams::Init(const char* in_types, const char* out_types) {
 102   if (!FillVec(ins_, in_types)) {
 103     return false;
 104   }
 105   if (!FillVec(outs_, out_types)) {
 106     FreeArguments(ins_);
 107     return false;
 108   }
 109   return true;
 110 }
 111
 112 void SrpcParams::FreeAll() {
 113   FreeArguments(ins_);
 114   FreeArguments(outs_);
 115   memset(ins_, 0, sizeof(ins_));
 116   memset(outs_, 0, sizeof(outs_));
 117 }
 118
 119 }  // namespace plugin