1 /*
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "perfetto/public/abi/heap_buffer.h"
18
19 #include "perfetto/protozero/scattered_heap_buffer.h"
20 #include "src/shared_lib/stream_writer.h"
21
PerfettoHeapBufferCreate(struct PerfettoStreamWriter * w)22 struct PerfettoHeapBuffer* PerfettoHeapBufferCreate(
23 struct PerfettoStreamWriter* w) {
24 auto* shb = new protozero::ScatteredHeapBuffer(4096, 4096);
25 auto* sw = new protozero::ScatteredStreamWriter(shb);
26 shb->set_writer(sw);
27
28 w->impl = reinterpret_cast<PerfettoStreamWriterImpl*>(sw);
29 perfetto::UpdateStreamWriter(*sw, w);
30 return reinterpret_cast<PerfettoHeapBuffer*>(shb);
31 }
32
PerfettoHeapBufferCopyInto(struct PerfettoHeapBuffer * buf,struct PerfettoStreamWriter * w,void * dst,size_t size)33 void PerfettoHeapBufferCopyInto(struct PerfettoHeapBuffer* buf,
34 struct PerfettoStreamWriter* w,
35 void* dst,
36 size_t size) {
37 auto* shb = reinterpret_cast<protozero::ScatteredHeapBuffer*>(buf);
38 auto* sw = reinterpret_cast<protozero::ScatteredStreamWriter*>(w->impl);
39 sw->set_write_ptr(w->write_ptr);
40
41 uint8_t* dst_ptr = reinterpret_cast<uint8_t*>(dst);
42 for (const protozero::ScatteredHeapBuffer::Slice& slice : shb->GetSlices()) {
43 if (size == 0) {
44 break;
45 }
46 protozero::ContiguousMemoryRange used_range = slice.GetUsedRange();
47 size_t to_copy = std::min(size, used_range.size());
48 memcpy(dst_ptr, used_range.begin, to_copy);
49 dst_ptr += to_copy;
50 size -= to_copy;
51 }
52 }
53
PerfettoHeapBufferDestroy(struct PerfettoHeapBuffer * buf,struct PerfettoStreamWriter * w)54 void PerfettoHeapBufferDestroy(struct PerfettoHeapBuffer* buf,
55 struct PerfettoStreamWriter* w) {
56 auto* shb = reinterpret_cast<protozero::ScatteredHeapBuffer*>(buf);
57 auto* sw = reinterpret_cast<protozero::ScatteredStreamWriter*>(w->impl);
58 delete sw;
59 delete shb;
60 }
61