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Support empty strings and vectors in standard codec #12974

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franciscojma86 merged 4 commits into from
Oct 15, 2019
Merged

Support empty strings and vectors in standard codec #12974

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2f174c9
Support empty strings and vectors in standard codec
rokob Oct 7, 2019
a0e69c3
fix typo in test name
rokob Oct 7, 2019
25c0f0f
remove unnecessary length check in ReadValue for List
rokob Oct 7, 2019
ed41ed6
we also don't need this check before calling read as memcpy can handl…
rokob Oct 7, 2019
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9 changes: 7 additions & 2 deletions shell/platform/common/cpp/client_wrapper/standard_codec.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -176,8 +176,10 @@ void StandardCodecSerializer::WriteValue(const EncodableValue& value,
const auto& string_value = value.StringValue();
size_t size = string_value.size();
WriteSize(size, stream);
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@franciscojma86 franciscojma86 Oct 7, 2019

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Should this be included in the if statement below?

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@rokob rokob Oct 7, 2019

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No we always want to write the size because the format specifies type|size|contents and the reading code needs to read that zero to be able to decode an empty string.

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@franciscojma86 franciscojma86 Oct 7, 2019

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makes sense, thanks!

stream->WriteBytes(reinterpret_cast<const uint8_t*>(string_value.data()),
size);
if (size > 0) {
stream->WriteBytes(
reinterpret_cast<const uint8_t*>(string_value.data()), size);
}
break;
}
case EncodableValue::Type::kByteList:
Expand Down Expand Up @@ -259,6 +261,9 @@ void StandardCodecSerializer::WriteVector(
ByteBufferStreamWriter* stream) const {
size_t count = vector.size();
WriteSize(count, stream);
if (count == 0) {
return;
}
uint8_t type_size = static_cast<uint8_t>(sizeof(T));
if (type_size > 1) {
stream->WriteAlignment(type_size);
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10 changes: 10 additions & 0 deletions shell/platform/common/cpp/client_wrapper/standard_message_codec_unittests.cc
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Expand Up @@ -97,6 +97,11 @@ TEST(StandardMessageCodec, CanEncodeAndDecodeStringWithNonBMPCodePoint) {
CheckEncodeDecode(EncodableValue(u8"h\U0001F602w"), bytes);
}

TEST(StandardMessageCodec, CanEncodeAndDecodeEmptyString) {
std::vector<uint8_t> bytes = {0x07, 0x00};
CheckEncodeDecode(EncodableValue(u8""), bytes);
}

TEST(StandardMessageCodec, CanEncodeAndDecodeList) {
std::vector<uint8_t> bytes = {
0x0c, 0x05, 0x00, 0x07, 0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x06,
Expand All @@ -117,6 +122,11 @@ TEST(StandardMessageCodec, CanEncodeAndDecodeList) {
CheckEncodeDecode(value, bytes);
}

TEST(StandardMessageCodec, CanEncodeAndDecodeEmptyList) {
std::vector<uint8_t> bytes = {0x0c, 0x00};
CheckEncodeDecode(EncodableValue(EncodableList{}), bytes);
}

TEST(StandardMessageCodec, CanEncodeAndDecodeMap) {
std::vector<uint8_t> bytes_prefix = {0x0d, 0x04};
EncodableValue value(EncodableMap{
Expand Down