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
110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
// Copyright 2016 Google Inc. All Rights Reserved.
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#include "entry_writer.h"
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#include "log.h"
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namespace wvcdm {
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namespace oemprofiler {
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static const uint64_t MAX_VALUES_FOR_BYTES[8] = {
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0x000000000000001F,
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0x0000000000001FFF,
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0x00000000001FFFFF,
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0x000000001FFFFFFF,
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0x0000001FFFFFFFFF,
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0x00001FFFFFFFFFFF,
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0x001FFFFFFFFFFFFF,
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0x1FFFFFFFFFFFFFFF
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};
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static const uint64_t CODE_FOR_BYTES[8] = {
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0x0000000000000000,
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0x0000000000002000,
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0x0000000000400000,
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0x0000000060000000,
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0x0000008000000000,
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0x0000A00000000000,
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0x00C0000000000000,
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0xE000000000000000
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};
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EntryWriter::EntryWriter() : write_head_(0){ }
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const uint8_t* EntryWriter::GetData() const { return bytes_; }
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size_t EntryWriter::GetSize() const { return write_head_; }
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int EntryWriter::WriteU8(uint8_t value) { return Write(value); }
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int EntryWriter::WriteU16(uint16_t value) { return Write(value); }
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int EntryWriter::WriteU32(uint32_t value) { return Write(value); }
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int EntryWriter::WriteU64(uint64_t value) { return Write(value); }
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int EntryWriter::WriteVLV(uint64_t value) {
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for (size_t i = 0; i < sizeof(uint64_t); i++) {
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if (value <= MAX_VALUES_FOR_BYTES[i]) {
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return Write(value | CODE_FOR_BYTES[i], i + 1);
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}
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}
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LOGE("writeVariableLengthValue - value too large for variable length value");
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return -1;
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}
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int EntryWriter::Write(uint64_t v, size_t num_bytes) {
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if (num_bytes > sizeof(uint64_t)) {
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LOGE("read - cannot read %zu bytes when 8 bytes are the max", num_bytes);
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return -1;
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}
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if (GetFreeSpace() < num_bytes) {
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LOGE("write - cannot write %zu when there are only %zu bytes remaining",
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num_bytes, GetFreeSpace());
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return -1;
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}
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for (int i = num_bytes; i > 0; i--) {
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bytes_[write_head_] = GetByte(v, i - 1);
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write_head_++;
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}
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return static_cast<int>(num_bytes);
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}
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void EntryWriter::Clear() {
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write_head_ = 0;
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}
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size_t EntryWriter::GetFreeSpace() const {
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return kBufferSize - write_head_;
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}
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template <typename T>
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int EntryWriter::Write(T v) {
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// start the values at index 1 so that the number of bytes
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// line up with the shift value
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static const size_t shifts[8] = { 0, 8, 16, 24, 32, 40, 48, 56 };
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if (GetFreeSpace() < sizeof(T)) {
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LOGE("write - cannot write %zu when there are only %zu bytes remaining",
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sizeof(T), GetFreeSpace());
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return -1; // there is not enough room
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}
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for (int i = sizeof(T) - 1; i >= 0; i--) {
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bytes_[write_head_] = (uint8_t)((v >> shifts[i]) & 0xFF);
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write_head_++;
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}
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return (int)sizeof(T);
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}
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uint8_t EntryWriter::GetByte(uint64_t value, size_t byte_index) {
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return static_cast<uint8_t>(0xFF & (value >> (byte_index * 8)));
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}
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} // oem profiler
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} // wvcdm
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