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rtc::Buffer: Remove backwards compatibility band-aids

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This CL makes two changes to rtc::Buffer that have had to wait for
Chromium's use of it to be modernized:

  1. Change default return type of rtc::Buffer::data() from char* to
     uint8_t*. uint8_t is a more natural type for bytes, and won't
     accidentally convert to a string. (Chromium previously expected
     the default return type to be char, which is why
     rtc::Buffer::data() initially got char as default return type in
     9478437f, but that's been fixed now.)

  2. Stop accepting void* inputs in constructors and methods. While
     this is convenient, it's also dangerous since any pointer type
     will implicitly convert to void*.

(This was previously committed (9e1a6d7c) but had to be reverted
(cbf09274) because Chromium on Android wasn't quite ready for it).

TBR=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/47109004

Cr-Commit-Position: refs/heads/master@{#9132}
This commit is contained in:
Karl Wiberg
2015-05-04 14:54:55 +02:00
parent f75f0cf36a
commit c56ac1ec29
4 changed files with 18 additions and 33 deletions
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31
webrtc/base/buffer.h
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@ -40,20 +40,6 @@ struct ByteType {
using t = decltype(F(static_cast<T*>(nullptr)));
};
// Deprecated: Accept void* in addition to the byte-sized types.
// TODO(kwiberg): Remove once Chromium doesn't need this anymore.
template <typename T>
struct ByteTypeOrVoid {
private:
static int F(uint8_t*);
static int F(int8_t*);
static int F(char*);
static int F(void*);
public:
using t = decltype(F(static_cast<T*>(nullptr)));
};
} // namespace internal
// Basic buffer class, can be grown and shrunk dynamically.
@ -70,10 +56,10 @@ class Buffer final {
// Construct a buffer and copy the specified number of bytes into it. The
// source array may be (const) uint8_t*, int8_t*, or char*.
template <typename T, typename internal::ByteTypeOrVoid<T>::t = 0>
template <typename T, typename internal::ByteType<T>::t = 0>
Buffer(const T* data, size_t size)
: Buffer(data, size, size) {}
template <typename T, typename internal::ByteTypeOrVoid<T>::t = 0>
template <typename T, typename internal::ByteType<T>::t = 0>
Buffer(const T* data, size_t size, size_t capacity)
: Buffer(size, capacity) {
std::memcpy(data_.get(), data, size);
@ -86,15 +72,14 @@ class Buffer final {
~Buffer();
// Get a pointer to the data. Just .data() will give you a (const) char*,
// but you may also use .data<int8_t>() and .data<uint8_t>().
// TODO(kwiberg): Change default to uint8_t
template <typename T = char, typename internal::ByteType<T>::t = 0>
// Get a pointer to the data. Just .data() will give you a (const) uint8_t*,
// but you may also use .data<int8_t>() and .data<char>().
template <typename T = uint8_t, typename internal::ByteType<T>::t = 0>
const T* data() const {
assert(IsConsistent());
return reinterpret_cast<T*>(data_.get());
}
template <typename T = char, typename internal::ByteType<T>::t = 0>
template <typename T = uint8_t, typename internal::ByteType<T>::t = 0>
T* data() {
assert(IsConsistent());
return reinterpret_cast<T*>(data_.get());
@ -133,7 +118,7 @@ class Buffer final {
// Replace the contents of the buffer. Accepts the same types as the
// constructors.
template <typename T, typename internal::ByteTypeOrVoid<T>::t = 0>
template <typename T, typename internal::ByteType<T>::t = 0>
void SetData(const T* data, size_t size) {
assert(IsConsistent());
size_ = 0;
@ -146,7 +131,7 @@ class Buffer final {
void SetData(const Buffer& buf) { SetData(buf.data(), buf.size()); }
// Append data to the buffer. Accepts the same types as the constructors.
template <typename T, typename internal::ByteTypeOrVoid<T>::t = 0>
template <typename T, typename internal::ByteType<T>::t = 0>
void AppendData(const T* data, size_t size) {
assert(IsConsistent());
const size_t new_size = size_ + size;