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