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Add new c++ helpers to ease usage of size prefixed FlatBuffers (#4626)

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It was missing some helpers when we choose to use
size prefixed FlatBuffers.

* Add general helper : GetPrefixedSize
* Add generated helpers :
 * GetSizePrefixedXXX
 * VerfifySizePrefixedXXXBuffer
 * FinishSizePrefixedXXXBuffer
This commit is contained in:
desqaz
2018-02-22 18:19:08 +01:00
committed by Wouter van Oortmerssen
parent 19c81b11b3
commit 132e6a8220
8 changed files with 86 additions and 14 deletions
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24
src/idl_gen_cpp.cpp
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@@ -333,6 +333,14 @@ class CppGenerator : public BaseGenerator {
code_ += "}";
code_ += "";
code_ += "inline \\";
code_ +=
"const {{CPP_NAME}} *{{NULLABLE_EXT}}GetSizePrefixed{{STRUCT_NAME}}(const void "
"*buf) {";
code_ += " return flatbuffers::GetSizePrefixedRoot<{{CPP_NAME}}>(buf);";
code_ += "}";
code_ += "";
if (parser_.opts.mutable_buffer) {
code_ += "inline \\";
code_ += "{{STRUCT_NAME}} *GetMutable{{STRUCT_NAME}}(void *buf) {";
@@ -370,6 +378,12 @@ class CppGenerator : public BaseGenerator {
code_ += "}";
code_ += "";
code_ += "inline bool VerifySizePrefixed{{STRUCT_NAME}}Buffer(";
code_ += " flatbuffers::Verifier &verifier) {";
code_ += " return verifier.VerifySizePrefixedBuffer<{{CPP_NAME}}>({{ID}});";
code_ += "}";
code_ += "";
if (parser_.file_extension_.length()) {
// Return the extension
code_ += "inline const char *{{STRUCT_NAME}}Extension() {";
@@ -389,6 +403,16 @@ class CppGenerator : public BaseGenerator {
code_ += "}";
code_ += "";
code_ += "inline void FinishSizePrefixed{{STRUCT_NAME}}Buffer(";
code_ += " flatbuffers::FlatBufferBuilder &fbb,";
code_ += " flatbuffers::Offset<{{CPP_NAME}}> root) {";
if (parser_.file_identifier_.length())
code_ += " fbb.FinishSizePrefixed(root, {{STRUCT_NAME}}Identifier());";
else
code_ += " fbb.FinishSizePrefixed(root);";
code_ += "}";
code_ += "";
if (parser_.opts.generate_object_based_api) {
// A convenient root unpack function.
auto native_name =