a249c67504
This CL is a merge from the widevine repo of: http://go/wvgerrit/16491 Circular Buffer http://go/wvgerrit/16512 Circular Buffer Tests http://go/wvgerrit/16493 Entry Writer http://go/wvgerrit/16495 Profiled Scope http://go/wvgerrit/16500 Stats Collection http://go/wvgerrit/16543 Disallow Stats Copy or Assign http://go/wvgerrit/16514 Moving OEM Function Enum http://go/wvgerrit/16501 Defining Session Interface http://go/wvgerrit/16502 Session Definitions http://go/wvgerrit/16573 Remove code to num bytes table http://go/wvgerrit/16556 Connecting Profiler to Profiled Scope http://go/wvgerrit/16557 Android Reading Profiler History http://go/wvgerrit/16574 Adding Get Stats Method http://go/wvgerrit/16606 Seperating Session Parsing http://go/wvgerrit/16607 Adding get stats method to DRMPlugin http://go/wvgerrit/16608 Fixing Linux Build Failure http://go/wvgerrit/16612 Stop Clearing History http://go/wvgerrit/16613 Accessing profiler information using session id http://go/wvgerrit/16614 Making All Session Subsets of Global Session BUG: 25123303 BUG: 26027857 Change-Id: Ie2422e644aa631871852ea0e461695aeb7060f88
93 lines
1.8 KiB
C++
93 lines
1.8 KiB
C++
// Copyright 2016 Google Inc. All Rights Reserved.
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#include "circular_buffer.h"
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#include "log.h"
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namespace wvcdm {
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namespace oemprofiler {
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CircularBuffer::CircularBuffer(size_t memory_budget) :
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buffer_(memory_budget) {
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buffer_.resize(memory_budget, 0x00);
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fill_ = head_ = tail_ = 0;
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}
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size_t CircularBuffer::GetFreeSpace() const {
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return buffer_.size() - fill_;
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}
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size_t CircularBuffer::GetUsedSpace() const {
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return fill_;
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}
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bool CircularBuffer::AddU8(uint8_t value) {
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return AddU8s(&value, 1);
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}
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bool CircularBuffer::AddU8s(const uint8_t* values, size_t values_length) {
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if (GetFreeSpace() < values_length) {
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return false;
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}
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for (size_t i = 0; i < values_length; i++) {
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buffer_[head_] = values[i];
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head_ = (head_ + 1) % buffer_.size();
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}
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fill_ += values_length;
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return true;
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}
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bool CircularBuffer::PeekU8s(
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size_t offset,
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uint8_t* out,
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size_t read_length) const {
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if (out == NULL) {
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LOGE("Cannot read to null output");
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return false;
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}
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if (offset >= GetUsedSpace()) {
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LOGE("Cannot read past end of data - %zu >= %zu",
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offset, GetUsedSpace());
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return false;
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}
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if (read_length > GetUsedSpace() - offset) {
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LOGE("Cannot read when there is not enough data - %zu >= %zu",
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GetUsedSpace() - offset, sizeof(uint8_t));
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return false;
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}
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for (size_t i = 0; i < read_length; i++) {
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const size_t safe_index = (tail_ + offset + i) % buffer_.size();
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out[i] = buffer_[safe_index];
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}
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return true;
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}
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bool CircularBuffer::PeekU8(size_t offset, uint8_t* out) const {
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return PeekU8s(offset, out, 1);
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}
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bool CircularBuffer::Remove(size_t count) {
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if (count > GetUsedSpace()) {
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// can't remove more than there is
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return false;
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}
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fill_ -= count;
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tail_ = (tail_ + count) % buffer_.size();
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return true;
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}
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} // namespace oemprofiler
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} // namespace wvcdm
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