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/**************************************************************************
*
* Copyright 2016 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include "trace_file.hpp"
#include <assert.h>
#include <string.h>
#include <iostream>
#include <brotli/decode.h>
#include "os.hpp"
using namespace trace;
class BrotliFile : public File {
public:
BrotliFile(void);
virtual ~BrotliFile();
protected:
virtual bool rawOpen(const char *filename) override;
virtual size_t rawRead(void *buffer, size_t length) override;
virtual int rawGetc(void) override;
virtual void rawClose(void) override;
virtual bool rawSkip(size_t length) override;
size_t containerSizeInBytes(void) const override;
size_t containerBytesRead(void) const override;
size_t dataBytesRead(void) const override;
const char *containerType(void) const override;
private:
BrotliDecoderState *state;
mutable std::ifstream m_stream;
static const size_t kFileBufferSize = 65536;
uint8_t input[kFileBufferSize];
const uint8_t* next_in;
size_t available_in;
std::streampos m_endPos = 0;
size_t m_dataBytesRead = 0;
};
BrotliFile::BrotliFile(void)
{
state = BrotliDecoderCreateInstance(nullptr, nullptr, nullptr);
available_in = 0;
next_in = input;
}
BrotliFile::~BrotliFile()
{
close();
BrotliDecoderDestroyInstance(state);
}
bool BrotliFile::rawOpen(const char *filename)
{
std::ios_base::openmode fmode = std::fstream::binary
| std::fstream::in;
m_stream.open(filename, fmode);
if (m_stream.is_open()) {
m_stream.seekg(0, std::ios::end);
m_endPos = m_stream.tellg();
m_stream.seekg(0, std::ios::beg);
m_dataBytesRead = 0;
}
return m_stream.is_open();
}
size_t BrotliFile::rawRead(void *buffer, size_t length)
{
uint8_t* output = (uint8_t *)buffer;
size_t total_out;
size_t available_out = length;
uint8_t* next_out = output;
while (true) {
BrotliDecoderResult result;
result = BrotliDecoderDecompressStream(state,
&available_in, &next_in,
&available_out, &next_out, &total_out);
if (result == BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT) {
if (m_stream.fail()) {
break;
}
m_stream.read((char *)input, kFileBufferSize);
available_in = kFileBufferSize;
if (m_stream.fail()) {
available_in = m_stream.gcount();
if (!available_in) {
break;
}
}
next_in = input;
} else {
assert(result == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT ||
result == BROTLI_DECODER_RESULT_SUCCESS);
break;
}
}
assert(next_out - output <= length);
m_dataBytesRead += static_cast<size_t>(next_out - output);
return next_out - output;
}
int BrotliFile::rawGetc()
{
unsigned char c;
if (rawRead(&c, 1) != 1) {
return -1;
}
return c;
}
void BrotliFile::rawClose()
{
m_stream.close();
}
bool BrotliFile::rawSkip(size_t)
{
return false;
}
size_t BrotliFile::containerSizeInBytes(void) const {
return static_cast<size_t>(m_endPos);
}
size_t BrotliFile::containerBytesRead(void) const {
return static_cast<size_t>(m_stream.tellg());
}
size_t BrotliFile::dataBytesRead(void) const {
return m_dataBytesRead;
}
const char *BrotliFile::containerType(void) const {
return "Brotli";
}
File * File::createBrotli(void) {
return new BrotliFile;
}
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