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49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
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// Copyright 2024 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/android/jni_bytebuffer.h"
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#include "base/numerics/safe_conversions.h"
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namespace base::android {
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base::span<const uint8_t> JavaByteBufferToSpan(JNIEnv* env, jobject buffer) {
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auto span = MaybeJavaByteBufferToSpan(env, buffer);
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CHECK(span.has_value());
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return *span;
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}
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base::span<uint8_t> JavaByteBufferToMutableSpan(JNIEnv* env, jobject buffer) {
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auto span = MaybeJavaByteBufferToMutableSpan(env, buffer);
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CHECK(span.has_value());
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return *span;
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}
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std::optional<base::span<const uint8_t>> MaybeJavaByteBufferToSpan(
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JNIEnv* env,
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jobject buffer) {
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auto span = MaybeJavaByteBufferToMutableSpan(env, buffer);
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return span ? std::make_optional(base::span<const uint8_t>(*span))
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: std::nullopt;
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}
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std::optional<base::span<uint8_t>> MaybeJavaByteBufferToMutableSpan(
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JNIEnv* env,
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jobject buffer) {
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void* data = env->GetDirectBufferAddress(buffer);
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jlong size = env->GetDirectBufferCapacity(buffer);
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// !data && size == 0 is allowed - this is how a 0-length Buffer is
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// represented.
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if (size < 0 || (!data && size > 0)) {
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return std::nullopt;
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}
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// SAFETY: This relies on the ByteBuffer to be internally valid.
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return UNSAFE_BUFFERS(base::span<uint8_t>(static_cast<uint8_t*>(data),
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base::checked_cast<size_t>(size)));
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}
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} // namespace base::android
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