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GNU General Public License
==========================
_Version 3, 29 June 2007_
_Copyright © 2007 Free Software Foundation, Inc. &lt;<http://fsf.org/>&gt;_
Everyone is permitted to copy and distribute verbatim copies of this license
document, but changing it is not allowed.
## Preamble
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The licenses for most software and other practical works are designed to take away
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## TERMS AND CONDITIONS
### 0. Definitions
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### 7. Additional Terms
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### 8. Termination
You may not propagate or modify a covered work except as expressly provided under
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granted under the third paragraph of section 11).
However, if you cease all violation of this License, then your license from a
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Moreover, your license from a particular copyright holder is reinstated permanently
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is the first time you have received notice of violation of this License (for any
work) from that copyright holder, and you cure the violation prior to 30 days after
your receipt of the notice.
Termination of your rights under this section does not terminate the licenses of
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receive new licenses for the same material under section 10.
### 9. Acceptance Not Required for Having Copies
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Program. Ancillary propagation of a covered work occurring solely as a consequence of
using peer-to-peer transmission to receive a copy likewise does not require
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### 10. Automatic Licensing of Downstream Recipients
Each time you convey a covered work, the recipient automatically receives a license
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merging organizations. If propagation of a covered work results from an entity
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receives whatever licenses to the work the party's predecessor in interest had or
could give under the previous paragraph, plus a right to possession of the
Corresponding Source of the work from the predecessor in interest, if the predecessor
has it or can get it with reasonable efforts.
You may not impose any further restrictions on the exercise of the rights granted or
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or other charge for exercise of rights granted under this License, and you may not
initiate litigation (including a cross-claim or counterclaim in a lawsuit) alleging
that any patent claim is infringed by making, using, selling, offering for sale, or
importing the Program or any portion of it.
### 11. Patents
A “contributor” is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The work thus
licensed is called the contributor's “contributor version”.
A contributor's “essential patent claims” are all patent claims owned or
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would be infringed by some manner, permitted by this License, of making, using, or
selling its contributor version, but do not include claims that would be infringed
only as a consequence of further modification of the contributor version. For
purposes of this definition, “control” includes the right to grant patent
sublicenses in a manner consistent with the requirements of this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free patent license
under the contributor's essential patent claims, to make, use, sell, offer for sale,
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In the following three paragraphs, a “patent license” is any express
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express permission to practice a patent or covenant not to sue for patent
infringement). To “grant” such a patent license to a party means to make
such an agreement or commitment not to enforce a patent against the party.
If you convey a covered work, knowingly relying on a patent license, and the
Corresponding Source of the work is not available for anyone to copy, free of charge
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Source to be so available, or **(2)** arrange to deprive yourself of the benefit of the
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the requirements of this License, to extend the patent license to downstream
recipients. “Knowingly relying” means you have actual knowledge that, but
for the patent license, your conveying the covered work in a country, or your
recipient's use of the covered work in a country, would infringe one or more
identifiable patents in that country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or arrangement, you
convey, or propagate by procuring conveyance of, a covered work, and grant a patent
license to some of the parties receiving the covered work authorizing them to use,
propagate, modify or convey a specific copy of the covered work, then the patent
license you grant is automatically extended to all recipients of the covered work and
works based on it.
A patent license is “discriminatory” if it does not include within the
scope of its coverage, prohibits the exercise of, or is conditioned on the
non-exercise of one or more of the rights that are specifically granted under this
License. You may not convey a covered work if you are a party to an arrangement with
a third party that is in the business of distributing software, under which you make
payment to the third party based on the extent of your activity of conveying the
work, and under which the third party grants, to any of the parties who would receive
the covered work from you, a discriminatory patent license **(a)** in connection with
copies of the covered work conveyed by you (or copies made from those copies), or **(b)**
primarily for and in connection with specific products or compilations that contain
the covered work, unless you entered into that arrangement, or that patent license
was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting any implied
license or other defenses to infringement that may otherwise be available to you
under applicable patent law.
### 12. No Surrender of Others' Freedom
If conditions are imposed on you (whether by court order, agreement or otherwise)
that contradict the conditions of this License, they do not excuse you from the
conditions of this License. If you cannot convey a covered work so as to satisfy
simultaneously your obligations under this License and any other pertinent
obligations, then as a consequence you may not convey it at all. For example, if you
agree to terms that obligate you to collect a royalty for further conveying from
those to whom you convey the Program, the only way you could satisfy both those terms
and this License would be to refrain entirely from conveying the Program.
### 13. Use with the GNU Affero General Public License
Notwithstanding any other provision of this License, you have permission to link or
combine any covered work with a work licensed under version 3 of the GNU Affero
General Public License into a single combined work, and to convey the resulting work.
The terms of this License will continue to apply to the part which is the covered
work, but the special requirements of the GNU Affero General Public License, section
13, concerning interaction through a network will apply to the combination as such.
### 14. Revised Versions of this License
The Free Software Foundation may publish revised and/or new versions of the GNU
General Public License from time to time. Such new versions will be similar in spirit
to the present version, but may differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the Program specifies that
a certain numbered version of the GNU General Public License “or any later
version” applies to it, you have the option of following the terms and
conditions either of that numbered version or of any later version published by the
Free Software Foundation. If the Program does not specify a version number of the GNU
General Public License, you may choose any version ever published by the Free
Software Foundation.
If the Program specifies that a proxy can decide which future versions of the GNU
General Public License can be used, that proxy's public statement of acceptance of a
version permanently authorizes you to choose that version for the Program.
Later license versions may give you additional or different permissions. However, no
additional obligations are imposed on any author or copyright holder as a result of
your choosing to follow a later version.
### 15. Disclaimer of Warranty
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE
QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
### 16. Limitation of Liability
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY
COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS
PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE
OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE
WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
### 17. Interpretation of Sections 15 and 16
If the disclaimer of warranty and limitation of liability provided above cannot be
given local legal effect according to their terms, reviewing courts shall apply local
law that most closely approximates an absolute waiver of all civil liability in
connection with the Program, unless a warranty or assumption of liability accompanies
a copy of the Program in return for a fee.
_END OF TERMS AND CONDITIONS_
## How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest possible use to
the public, the best way to achieve this is to make it free software which everyone
can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest to attach them
to the start of each source file to most effectively state the exclusion of warranty;
and each file should have at least the “copyright” line and a pointer to
where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short notice like this
when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'show c' for details.
The hypothetical commands `show w` and `show c` should show the appropriate parts of
the General Public License. Of course, your program's commands might be different;
for a GUI interface, you would use an “about box”.
You should also get your employer (if you work as a programmer) or school, if any, to
sign a “copyright disclaimer” for the program, if necessary. For more
information on this, and how to apply and follow the GNU GPL, see
&lt;<http://www.gnu.org/licenses/>&gt;.
The GNU General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may consider it
more useful to permit linking proprietary applications with the library. If this is
what you want to do, use the GNU Lesser General Public License instead of this
License. But first, please read
&lt;<http://www.gnu.org/philosophy/why-not-lgpl.html>&gt;.

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CC=gcc
CXX=g++
CFLAGS=-O3
CXXFLAGS=-O3
DEPS = src/compress.h src/stringutils.h
LIBS=-llzma
OBJECTS = build/compress.o build/stringutils.o
MAKE_BUILD_FOLDER = @mkdir -p build
.PHONY: all clean
all: $(OBJECTS) build/compress_measurements
build/%.o: src/%.c $(DEPS)
$(MAKE_BUILD_FOLDER)
$(CC) -c -o $@ $< $(CFLAGS)
build/%.o: src/%.cpp $(DEPS)
$(MAKE_BUILD_FOLDER)
$(CXX) -c -o $@ $< $(CFLAGS)
build/compress_measurements: $(OBJECTS) src/compress_measurements.cpp
$(MAKE_BUILD_FOLDER)
$(CXX) -o $@ $^ $(LIBS) $(CFLAGS)
clean:
-rm -rf build

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///////////////////////////////////////////////////////////////////////////////////////////////////////////
// This file is based on https://github.com/kobolabs/liblzma/blob/master/doc/examples/01_compress_easy.c //
///////////////////////////////////////////////////////////////////////////////////////////////////////////
#include "compress.h"
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <lzma.h>
bool lzma_init_encoder(lzma_stream *strm, uint32_t preset)
{
// Initialize the encoder using a preset. Set the integrity to check
// to CRC64, which is the default in the xz command line tool. If
// the .xz file needs to be decompressed with XZ Embedded, use
// LZMA_CHECK_CRC32 instead.
lzma_ret ret = lzma_easy_encoder(strm, preset, LZMA_CHECK_CRC64);
// Return successfully if the initialization went fine.
if (ret == LZMA_OK)
return true;
// Something went wrong. The possible errors are documented in
// lzma/container.h (src/liblzma/api/lzma/container.h in the source
// package or e.g. /usr/include/lzma/container.h depending on the
// install prefix).
const char *msg;
switch (ret)
{
case LZMA_MEM_ERROR:
msg = "Memory allocation failed";
break;
case LZMA_OPTIONS_ERROR:
msg = "Specified preset is not supported";
break;
case LZMA_UNSUPPORTED_CHECK:
msg = "Specified integrity check is not supported";
break;
default:
// This is most likely LZMA_PROG_ERROR indicating a bug in
// this program or in liblzma. It is inconvenient to have a
// separate error message for errors that should be impossible
// to occur, but knowing the error code is important for
// debugging. That's why it is good to print the error code
// at least when there is no good error message to show.
msg = "Unknown error, possibly a bug";
break;
}
fprintf(stderr, "Error initializing the encoder: %s (error code %u)\n",
msg, ret);
return false;
}
bool lzma_compress(lzma_stream *strm, FILE *infile, FILE *outfile)
{
// This will be LZMA_RUN until the end of the input file is reached.
// This tells lzma_code() when there will be no more input.
lzma_action action = LZMA_RUN;
// Buffers to temporarily hold uncompressed input
// and compressed output.
uint8_t inbuf[BUFSIZ];
uint8_t outbuf[BUFSIZ];
// Initialize the input and output pointers. Initializing next_in
// and avail_in isn't really necessary when we are going to encode
// just one file since LZMA_STREAM_INIT takes care of initializing
// those already. But it doesn't hurt much and it will be needed
// if encoding more than one file like we will in 02_decompress.c.
//
// While we don't care about strm->total_in or strm->total_out in this
// example, it is worth noting that initializing the encoder will
// always reset total_in and total_out to zero. But the encoder
// initialization doesn't touch next_in, avail_in, next_out, or
// avail_out.
strm->next_in = NULL;
strm->avail_in = 0;
strm->next_out = outbuf;
strm->avail_out = sizeof(outbuf);
// Loop until the file has been successfully compressed or until
// an error occurs.
while (true)
{
// Fill the input buffer if it is empty.
if (strm->avail_in == 0 && !feof(infile))
{
strm->next_in = inbuf;
strm->avail_in = fread(inbuf, 1, sizeof(inbuf),
infile);
if (ferror(infile))
{
fprintf(stderr, "Read error: %s\n",
strerror(errno));
return false;
}
// Once the end of the input file has been reached,
// we need to tell lzma_code() that no more input
// will be coming and that it should finish the
// encoding.
if (feof(infile))
action = LZMA_FINISH;
}
// Tell liblzma do the actual encoding.
//
// This reads up to strm->avail_in bytes of input starting
// from strm->next_in. avail_in will be decremented and
// next_in incremented by an equal amount to match the
// number of input bytes consumed.
//
// Up to strm->avail_out bytes of compressed output will be
// written starting from strm->next_out. avail_out and next_out
// will be incremented by an equal amount to match the number
// of output bytes written.
//
// The encoder has to do internal buffering, which means that
// it may take quite a bit of input before the same data is
// available in compressed form in the output buffer.
lzma_ret ret = lzma_code(strm, action);
// If the output buffer is full or if the compression finished
// successfully, write the data from the output bufffer to
// the output file.
if (strm->avail_out == 0 || ret == LZMA_STREAM_END)
{
// When lzma_code() has returned LZMA_STREAM_END,
// the output buffer is likely to be only partially
// full. Calculate how much new data there is to
// be written to the output file.
size_t write_size = sizeof(outbuf) - strm->avail_out;
if (fwrite(outbuf, 1, write_size, outfile) != write_size)
{
fprintf(stderr, "Write error: %s\n",
strerror(errno));
return false;
}
// Reset next_out and avail_out.
strm->next_out = outbuf;
strm->avail_out = sizeof(outbuf);
}
// Normally the return value of lzma_code() will be LZMA_OK
// until everything has been encoded.
if (ret != LZMA_OK)
{
// Once everything has been encoded successfully, the
// return value of lzma_code() will be LZMA_STREAM_END.
//
// It is important to check for LZMA_STREAM_END. Do not
// assume that getting ret != LZMA_OK would mean that
// everything has gone well.
if (ret == LZMA_STREAM_END)
return true;
// It's not LZMA_OK nor LZMA_STREAM_END,
// so it must be an error code. See lzma/base.h
// (src/liblzma/api/lzma/base.h in the source package
// or e.g. /usr/include/lzma/base.h depending on the
// install prefix) for the list and documentation of
// possible values. Most values listen in lzma_ret
// enumeration aren't possible in this example.
const char *msg;
switch (ret)
{
case LZMA_MEM_ERROR:
msg = "Memory allocation failed";
break;
case LZMA_DATA_ERROR:
// This error is returned if the compressed
// or uncompressed size get near 8 EiB
// (2^63 bytes) because that's where the .xz
// file format size limits currently are.
// That is, the possibility of this error
// is mostly theoretical unless you are doing
// something very unusual.
//
// Note that strm->total_in and strm->total_out
// have nothing to do with this error. Changing
// those variables won't increase or decrease
// the chance of getting this error.
msg = "File size limits exceeded";
break;
default:
// This is most likely LZMA_PROG_ERROR, but
// if this program is buggy (or liblzma has
// a bug), it may be e.g. LZMA_BUF_ERROR or
// LZMA_OPTIONS_ERROR too.
//
// It is inconvenient to have a separate
// error message for errors that should be
// impossible to occur, but knowing the error
// code is important for debugging. That's why
// it is good to print the error code at least
// when there is no good error message to show.
msg = "Unknown error, possibly a bug";
break;
}
fprintf(stderr, "Encoder error: %s (error code %u)\n",
msg, ret);
return false;
}
}
}

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///////////////////////////////////////////////////////////////////////////////////////////////////////////
// This file is based on https://github.com/kobolabs/liblzma/blob/master/doc/examples/01_compress_easy.c //
///////////////////////////////////////////////////////////////////////////////////////////////////////////
#include <stdbool.h>
#include <stdio.h>
#include <lzma.h>
bool lzma_init_encoder(lzma_stream *strm, uint32_t preset);
bool lzma_compress(lzma_stream *strm, FILE *infile, FILE *outfile);

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#include "stringutils.h"
extern "C"
{
#include "compress.h"
}
#include <iostream>
#include <vector>
#include <filesystem>
#include <cstring>
#include <cstdio>
#include <cerrno>
extern "C"
{
#include <lzma.h>
}
const std::vector<std::string> ENDINGS = {".mf4", ".rif"};
int main(int argc, char *argv[])
{
const std::filesystem::path directory = argc > 1 ? argv[1] : std::filesystem::current_path();
lzma_stream strm = LZMA_STREAM_INIT;
bool success = lzma_init_encoder(&strm, 9 | LZMA_PRESET_EXTREME);
if (success)
{
for (const auto &entry : std::filesystem::directory_iterator(directory))
{
const std::string path = entry.path().string();
if (entry.is_regular_file() && stringutils::has_any_ending(stringutils::to_lower(path), ENDINGS))
{
std::cout << "Compressing " + path + "..." << std::flush;
const std::string output_path = path + ".xz";
FILE *infile = std::fopen(path.c_str(), "rb");
FILE *outfile = std::fopen(output_path.c_str(), "wb");
success = lzma_compress(&strm, infile, outfile);
std::fclose(infile);
if (std::fclose(outfile))
{
std::cout << " FAILED!" << std::endl
<< std::flush;
fprintf(stderr, "Write error: %s\n", std::strerror(errno));
success = false;
break;
}
std::filesystem::remove(path);
std::cout << " OK!" << std::endl
<< std::flush;
}
}
}
lzma_end(&strm);
return success ? EXIT_SUCCESS : EXIT_FAILURE;
}

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#include "stringutils.h"
#include <string>
#include <vector>
#include <algorithm>
namespace stringutils
{
std::string to_lower(std::string string)
{
std::transform(string.begin(), string.end(), string.begin(),
[](unsigned char c)
{ return std::tolower(c); });
return string;
}
bool has_ending(const std::string &string, const std::string &ending)
{
return string.length() >= ending.length() &&
string.compare(string.length() - ending.length(), ending.length(), ending) == 0;
}
bool has_any_ending(const std::string &string, const std::vector<std::string> &endings)
{
for (const auto ending : endings)
{
if (has_ending(string, ending))
{
return true;
}
}
return false;
}
}

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#include <string>
#include <vector>
namespace stringutils
{
std::string to_lower(std::string string);
bool has_ending(const std::string &string, const std::string &ending);
bool has_any_ending(const std::string &string, const std::vector<std::string> &endings);
}