mirror of
https://github.com/cwinfo/matterbridge.git
synced 2025-07-11 00:16:30 +00:00
Bump github.com/SevereCloud/vksdk/v2 from 2.11.0 to 2.13.0 (#1698)
Bumps [github.com/SevereCloud/vksdk/v2](https://github.com/SevereCloud/vksdk) from 2.11.0 to 2.13.0. - [Release notes](https://github.com/SevereCloud/vksdk/releases) - [Commits](https://github.com/SevereCloud/vksdk/compare/v2.11.0...v2.13.0) --- updated-dependencies: - dependency-name: github.com/SevereCloud/vksdk/v2 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
This commit is contained in:
dependabot[bot]
256
vendor/github.com/klauspost/compress/s2/README.md
generated
vendored
256
vendor/github.com/klauspost/compress/s2/README.md
generated
vendored
@ -20,6 +20,7 @@ This is important, so you don't have to worry about spending CPU cycles on alrea
|
||||
* Concurrent stream compression
|
||||
* Faster decompression, even for Snappy compatible content
|
||||
* Ability to quickly skip forward in compressed stream
|
||||
* Random seeking with indexes
|
||||
* Compatible with reading Snappy compressed content
|
||||
* Smaller block size overhead on incompressible blocks
|
||||
* Block concatenation
|
||||
@ -29,8 +30,8 @@ This is important, so you don't have to worry about spending CPU cycles on alrea
|
||||
|
||||
## Drawbacks over Snappy
|
||||
|
||||
* Not optimized for 32 bit systems.
|
||||
* Streams use slightly more memory due to larger blocks and concurrency (configurable).
|
||||
* Not optimized for 32 bit systems
|
||||
* Streams use slightly more memory due to larger blocks and concurrency (configurable)
|
||||
|
||||
# Usage
|
||||
|
||||
@ -141,7 +142,7 @@ Binaries can be downloaded on the [Releases Page](https://github.com/klauspost/c
|
||||
|
||||
Installing then requires Go to be installed. To install them, use:
|
||||
|
||||
`go install github.com/klauspost/compress/s2/cmd/s2c && go install github.com/klauspost/compress/s2/cmd/s2d`
|
||||
`go install github.com/klauspost/compress/s2/cmd/s2c@latest && go install github.com/klauspost/compress/s2/cmd/s2d@latest`
|
||||
|
||||
To build binaries to the current folder use:
|
||||
|
||||
@ -176,6 +177,8 @@ Options:
|
||||
Compress faster, but with a minor compression loss
|
||||
-help
|
||||
Display help
|
||||
-index
|
||||
Add seek index (default true)
|
||||
-o string
|
||||
Write output to another file. Single input file only
|
||||
-pad string
|
||||
@ -217,11 +220,15 @@ Options:
|
||||
Display help
|
||||
-o string
|
||||
Write output to another file. Single input file only
|
||||
-q Don't write any output to terminal, except errors
|
||||
-offset string
|
||||
Start at offset. Examples: 92, 64K, 256K, 1M, 4M. Requires Index
|
||||
-q Don't write any output to terminal, except errors
|
||||
-rm
|
||||
Delete source file(s) after successful decompression
|
||||
Delete source file(s) after successful decompression
|
||||
-safe
|
||||
Do not overwrite output files
|
||||
Do not overwrite output files
|
||||
-tail string
|
||||
Return last of compressed file. Examples: 92, 64K, 256K, 1M, 4M. Requires Index
|
||||
-verify
|
||||
Verify files, but do not write output
|
||||
```
|
||||
@ -633,12 +640,12 @@ Compression and speed is typically a bit better `MaxEncodedLen` is also smaller
|
||||
Comparison of [`webdevdata.org-2015-01-07-subset`](https://files.klauspost.com/compress/webdevdata.org-2015-01-07-4GB-subset.7z),
|
||||
53927 files, total input size: 4,014,735,833 bytes. amd64, single goroutine used:
|
||||
|
||||
| Encoder | Size | MB/s | Reduction |
|
||||
|-----------------------|------------|--------|------------
|
||||
| snappy.Encode | 1128706759 | 725.59 | 71.89% |
|
||||
| s2.EncodeSnappy | 1093823291 | 899.16 | 72.75% |
|
||||
| s2.EncodeSnappyBetter | 1001158548 | 578.49 | 75.06% |
|
||||
| s2.EncodeSnappyBest | 944507998 | 66.00 | 76.47% |
|
||||
| Encoder | Size | MB/s | Reduction |
|
||||
|-----------------------|------------|------------|------------
|
||||
| snappy.Encode | 1128706759 | 725.59 | 71.89% |
|
||||
| s2.EncodeSnappy | 1093823291 | **899.16** | 72.75% |
|
||||
| s2.EncodeSnappyBetter | 1001158548 | 578.49 | 75.06% |
|
||||
| s2.EncodeSnappyBest | 944507998 | 66.00 | **76.47%**|
|
||||
|
||||
## Streams
|
||||
|
||||
@ -649,11 +656,11 @@ Comparison of different streams, AMD Ryzen 3950x, 16 cores. Size and throughput:
|
||||
|
||||
| File | snappy.NewWriter | S2 Snappy | S2 Snappy, Better | S2 Snappy, Best |
|
||||
|-----------------------------|--------------------------|---------------------------|--------------------------|-------------------------|
|
||||
| nyc-taxi-data-10M.csv | 1316042016 - 517.54MB/s | 1307003093 - 8406.29MB/s | 1174534014 - 4984.35MB/s | 1115904679 - 177.81MB/s |
|
||||
| enwik10 | 5088294643 - 433.45MB/s | 5175840939 - 8454.52MB/s | 4560784526 - 4403.10MB/s | 4340299103 - 159.71MB/s |
|
||||
| 10gb.tar | 6056946612 - 703.25MB/s | 6208571995 - 9035.75MB/s | 5741646126 - 2402.08MB/s | 5548973895 - 171.17MB/s |
|
||||
| github-june-2days-2019.json | 1525176492 - 908.11MB/s | 1476519054 - 12625.93MB/s | 1400547532 - 6163.61MB/s | 1321887137 - 200.71MB/s |
|
||||
| consensus.db.10gb | 5412897703 - 1054.38MB/s | 5354073487 - 12634.82MB/s | 5335069899 - 2472.23MB/s | 5201000954 - 166.32MB/s |
|
||||
| nyc-taxi-data-10M.csv | 1316042016 - 539.47MB/s | 1307003093 - 10132.73MB/s | 1174534014 - 5002.44MB/s | 1115904679 - 177.97MB/s |
|
||||
| enwik10 (xml) | 5088294643 - 451.13MB/s | 5175840939 - 9440.69MB/s | 4560784526 - 4487.21MB/s | 4340299103 - 158.92MB/s |
|
||||
| 10gb.tar (mixed) | 6056946612 - 729.73MB/s | 6208571995 - 9978.05MB/s | 5741646126 - 4919.98MB/s | 5548973895 - 180.44MB/s |
|
||||
| github-june-2days-2019.json | 1525176492 - 933.00MB/s | 1476519054 - 13150.12MB/s | 1400547532 - 5803.40MB/s | 1321887137 - 204.29MB/s |
|
||||
| consensus.db.10gb (db) | 5412897703 - 1102.14MB/s | 5354073487 - 13562.91MB/s | 5335069899 - 5294.73MB/s | 5201000954 - 175.72MB/s |
|
||||
|
||||
# Decompression
|
||||
|
||||
@ -679,7 +686,220 @@ The 10 byte 'stream identifier' of the second stream can optionally be stripped,
|
||||
|
||||
Blocks can be concatenated using the `ConcatBlocks` function.
|
||||
|
||||
Snappy blocks/streams can safely be concatenated with S2 blocks and streams.
|
||||
Snappy blocks/streams can safely be concatenated with S2 blocks and streams.
|
||||
Streams with indexes (see below) will currently not work on concatenated streams.
|
||||
|
||||
# Stream Seek Index
|
||||
|
||||
S2 and Snappy streams can have indexes. These indexes will allow random seeking within the compressed data.
|
||||
|
||||
The index can either be appended to the stream as a skippable block or returned for separate storage.
|
||||
|
||||
When the index is appended to a stream it will be skipped by regular decoders,
|
||||
so the output remains compatible with other decoders.
|
||||
|
||||
## Creating an Index
|
||||
|
||||
To automatically add an index to a stream, add `WriterAddIndex()` option to your writer.
|
||||
Then the index will be added to the stream when `Close()` is called.
|
||||
|
||||
```
|
||||
// Add Index to stream...
|
||||
enc := s2.NewWriter(w, s2.WriterAddIndex())
|
||||
io.Copy(enc, r)
|
||||
enc.Close()
|
||||
```
|
||||
|
||||
If you want to store the index separately, you can use `CloseIndex()` instead of the regular `Close()`.
|
||||
This will return the index. Note that `CloseIndex()` should only be called once, and you shouldn't call `Close()`.
|
||||
|
||||
```
|
||||
// Get index for separate storage...
|
||||
enc := s2.NewWriter(w)
|
||||
io.Copy(enc, r)
|
||||
index, err := enc.CloseIndex()
|
||||
```
|
||||
|
||||
The `index` can then be used needing to read from the stream.
|
||||
This means the index can be used without needing to seek to the end of the stream
|
||||
or for manually forwarding streams. See below.
|
||||
|
||||
Finally, an existing S2/Snappy stream can be indexed using the `s2.IndexStream(r io.Reader)` function.
|
||||
|
||||
## Using Indexes
|
||||
|
||||
To use indexes there is a `ReadSeeker(random bool, index []byte) (*ReadSeeker, error)` function available.
|
||||
|
||||
Calling ReadSeeker will return an [io.ReadSeeker](https://pkg.go.dev/io#ReadSeeker) compatible version of the reader.
|
||||
|
||||
If 'random' is specified the returned io.Seeker can be used for random seeking, otherwise only forward seeking is supported.
|
||||
Enabling random seeking requires the original input to support the [io.Seeker](https://pkg.go.dev/io#Seeker) interface.
|
||||
|
||||
```
|
||||
dec := s2.NewReader(r)
|
||||
rs, err := dec.ReadSeeker(false, nil)
|
||||
rs.Seek(wantOffset, io.SeekStart)
|
||||
```
|
||||
|
||||
Get a seeker to seek forward. Since no index is provided, the index is read from the stream.
|
||||
This requires that an index was added and that `r` supports the [io.Seeker](https://pkg.go.dev/io#Seeker) interface.
|
||||
|
||||
A custom index can be specified which will be used if supplied.
|
||||
When using a custom index, it will not be read from the input stream.
|
||||
|
||||
```
|
||||
dec := s2.NewReader(r)
|
||||
rs, err := dec.ReadSeeker(false, index)
|
||||
rs.Seek(wantOffset, io.SeekStart)
|
||||
```
|
||||
|
||||
This will read the index from `index`. Since we specify non-random (forward only) seeking `r` does not have to be an io.Seeker
|
||||
|
||||
```
|
||||
dec := s2.NewReader(r)
|
||||
rs, err := dec.ReadSeeker(true, index)
|
||||
rs.Seek(wantOffset, io.SeekStart)
|
||||
```
|
||||
|
||||
Finally, since we specify that we want to do random seeking `r` must be an io.Seeker.
|
||||
|
||||
The returned [ReadSeeker](https://pkg.go.dev/github.com/klauspost/compress/s2#ReadSeeker) contains a shallow reference to the existing Reader,
|
||||
meaning changes performed to one is reflected in the other.
|
||||
|
||||
To check if a stream contains an index at the end, the `(*Index).LoadStream(rs io.ReadSeeker) error` can be used.
|
||||
|
||||
## Manually Forwarding Streams
|
||||
|
||||
Indexes can also be read outside the decoder using the [Index](https://pkg.go.dev/github.com/klauspost/compress/s2#Index) type.
|
||||
This can be used for parsing indexes, either separate or in streams.
|
||||
|
||||
In some cases it may not be possible to serve a seekable stream.
|
||||
This can for instance be an HTTP stream, where the Range request
|
||||
is sent at the start of the stream.
|
||||
|
||||
With a little bit of extra code it is still possible to use indexes
|
||||
to forward to specific offset with a single forward skip.
|
||||
|
||||
It is possible to load the index manually like this:
|
||||
```
|
||||
var index s2.Index
|
||||
_, err = index.Load(idxBytes)
|
||||
```
|
||||
|
||||
This can be used to figure out how much to offset the compressed stream:
|
||||
|
||||
```
|
||||
compressedOffset, uncompressedOffset, err := index.Find(wantOffset)
|
||||
```
|
||||
|
||||
The `compressedOffset` is the number of bytes that should be skipped
|
||||
from the beginning of the compressed file.
|
||||
|
||||
The `uncompressedOffset` will then be offset of the uncompressed bytes returned
|
||||
when decoding from that position. This will always be <= wantOffset.
|
||||
|
||||
When creating a decoder it must be specified that it should *not* expect a stream identifier
|
||||
at the beginning of the stream. Assuming the io.Reader `r` has been forwarded to `compressedOffset`
|
||||
we create the decoder like this:
|
||||
|
||||
```
|
||||
dec := s2.NewReader(r, s2.ReaderIgnoreStreamIdentifier())
|
||||
```
|
||||
|
||||
We are not completely done. We still need to forward the stream the uncompressed bytes we didn't want.
|
||||
This is done using the regular "Skip" function:
|
||||
|
||||
```
|
||||
err = dec.Skip(wantOffset - uncompressedOffset)
|
||||
```
|
||||
|
||||
This will ensure that we are at exactly the offset we want, and reading from `dec` will start at the requested offset.
|
||||
|
||||
## Index Format:
|
||||
|
||||
Each block is structured as a snappy skippable block, with the chunk ID 0x99.
|
||||
|
||||
The block can be read from the front, but contains information so it can be read from the back as well.
|
||||
|
||||
Numbers are stored as fixed size little endian values or [zigzag encoded](https://developers.google.com/protocol-buffers/docs/encoding#signed_integers) [base 128 varints](https://developers.google.com/protocol-buffers/docs/encoding),
|
||||
with un-encoded value length of 64 bits, unless other limits are specified.
|
||||
|
||||
| Content | Format |
|
||||
|---------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------|
|
||||
| ID, `[1]byte` | Always 0x99. |
|
||||
| Data Length, `[3]byte` | 3 byte little-endian length of the chunk in bytes, following this. |
|
||||
| Header `[6]byte` | Header, must be `[115, 50, 105, 100, 120, 0]` or in text: "s2idx\x00". |
|
||||
| UncompressedSize, Varint | Total Uncompressed size. |
|
||||
| CompressedSize, Varint | Total Compressed size if known. Should be -1 if unknown. |
|
||||
| EstBlockSize, Varint | Block Size, used for guessing uncompressed offsets. Must be >= 0. |
|
||||
| Entries, Varint | Number of Entries in index, must be < 65536 and >=0. |
|
||||
| HasUncompressedOffsets `byte` | 0 if no uncompressed offsets are present, 1 if present. Other values are invalid. |
|
||||
| UncompressedOffsets, [Entries]VarInt | Uncompressed offsets. See below how to decode. |
|
||||
| CompressedOffsets, [Entries]VarInt | Compressed offsets. See below how to decode. |
|
||||
| Block Size, `[4]byte` | Little Endian total encoded size (including header and trailer). Can be used for searching backwards to start of block. |
|
||||
| Trailer `[6]byte` | Trailer, must be `[0, 120, 100, 105, 50, 115]` or in text: "\x00xdi2s". Can be used for identifying block from end of stream. |
|
||||
|
||||
For regular streams the uncompressed offsets are fully predictable,
|
||||
so `HasUncompressedOffsets` allows to specify that compressed blocks all have
|
||||
exactly `EstBlockSize` bytes of uncompressed content.
|
||||
|
||||
Entries *must* be in order, starting with the lowest offset,
|
||||
and there *must* be no uncompressed offset duplicates.
|
||||
Entries *may* point to the start of a skippable block,
|
||||
but it is then not allowed to also have an entry for the next block since
|
||||
that would give an uncompressed offset duplicate.
|
||||
|
||||
There is no requirement for all blocks to be represented in the index.
|
||||
In fact there is a maximum of 65536 block entries in an index.
|
||||
|
||||
The writer can use any method to reduce the number of entries.
|
||||
An implicit block start at 0,0 can be assumed.
|
||||
|
||||
### Decoding entries:
|
||||
|
||||
```
|
||||
// Read Uncompressed entries.
|
||||
// Each assumes EstBlockSize delta from previous.
|
||||
for each entry {
|
||||
uOff = 0
|
||||
if HasUncompressedOffsets == 1 {
|
||||
uOff = ReadVarInt // Read value from stream
|
||||
}
|
||||
|
||||
// Except for the first entry, use previous values.
|
||||
if entryNum == 0 {
|
||||
entry[entryNum].UncompressedOffset = uOff
|
||||
continue
|
||||
}
|
||||
|
||||
// Uncompressed uses previous offset and adds EstBlockSize
|
||||
entry[entryNum].UncompressedOffset = entry[entryNum-1].UncompressedOffset + EstBlockSize
|
||||
}
|
||||
|
||||
|
||||
// Guess that the first block will be 50% of uncompressed size.
|
||||
// Integer truncating division must be used.
|
||||
CompressGuess := EstBlockSize / 2
|
||||
|
||||
// Read Compressed entries.
|
||||
// Each assumes CompressGuess delta from previous.
|
||||
// CompressGuess is adjusted for each value.
|
||||
for each entry {
|
||||
cOff = ReadVarInt // Read value from stream
|
||||
|
||||
// Except for the first entry, use previous values.
|
||||
if entryNum == 0 {
|
||||
entry[entryNum].CompressedOffset = cOff
|
||||
continue
|
||||
}
|
||||
|
||||
// Compressed uses previous and our estimate.
|
||||
entry[entryNum].CompressedOffset = entry[entryNum-1].CompressedOffset + CompressGuess
|
||||
|
||||
// Adjust compressed offset for next loop, integer truncating division must be used.
|
||||
CompressGuess += cOff/2
|
||||
}
|
||||
```
|
||||
|
||||
# Format Extensions
|
||||
|
||||
|
||||
Reference in New Issue
Block a user