src/dawn/native/stream/Stream.cpp

// Copyright 2022 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
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//    this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#include "dawn/native/stream/Stream.h"

#include <string>

#include "dawn/native/Limits.h"

namespace dawn::native::stream {

template <>
void Stream<std::string>::Write(Sink* s, const std::string& t) {
    StreamIn(s, t.length());
    size_t size = t.length() * sizeof(char);
    if (size > 0) {
        void* ptr = s->GetSpace(size);
        memcpy(ptr, t.data(), size);
    }
}

template <>
MaybeError Stream<std::string>::Read(Source* s, std::string* t) {
    size_t length;
    DAWN_TRY(StreamOut(s, &length));
    const void* ptr;
    DAWN_TRY(s->Read(&ptr, length));
    *t = std::string(static_cast<const char*>(ptr), length);
    return {};
}

template <>
void Stream<std::wstring>::Write(Sink* s, const std::wstring& t) {
    StreamIn(s, t.length());
    size_t size = t.length() * sizeof(wchar_t);
    if (size > 0) {
        void* ptr = s->GetSpace(size);
        memcpy(ptr, t.data(), size);
    }
}

template <>
MaybeError Stream<std::wstring>::Read(Source* s, std::wstring* t) {
    size_t length;
    DAWN_TRY(StreamOut(s, &length));
    size_t size = length * sizeof(wchar_t);
    const void* ptr;
    DAWN_TRY(s->Read(&ptr, size));
    *t = std::wstring(static_cast<const wchar_t*>(ptr), length);
    return {};
}

template <>
void Stream<std::string_view>::Write(Sink* s, const std::string_view& t) {
    StreamIn(s, t.length());
    size_t size = t.length() * sizeof(char);
    if (size > 0) {
        void* ptr = s->GetSpace(size);
        memcpy(ptr, t.data(), size);
    }
}

template <>
void Stream<std::wstring_view>::Write(Sink* s, const std::wstring_view& t) {
    StreamIn(s, t.length());
    size_t size = t.length() * sizeof(wchar_t);
    if (size > 0) {
        void* ptr = s->GetSpace(size);
        memcpy(ptr, t.data(), size);
    }
}

}  // namespace dawn::native::stream