[VOL-5292] Implementation for fetching the GEM port history Data from the ONT
Change-Id: I4cf22555cbd13bcd5e49e620c8aa8b67cbd2891c
Signed-off-by: Akash Reddy Kankanala <akash.kankanala@radisys.com>
diff --git a/vendor/github.com/klauspost/compress/zstd/decodeheader.go b/vendor/github.com/klauspost/compress/zstd/decodeheader.go
index 69736e8..5022e71 100644
--- a/vendor/github.com/klauspost/compress/zstd/decodeheader.go
+++ b/vendor/github.com/klauspost/compress/zstd/decodeheader.go
@@ -5,6 +5,7 @@
import (
"bytes"
+ "encoding/binary"
"errors"
"io"
)
@@ -15,18 +16,50 @@
// Header contains information about the first frame and block within that.
type Header struct {
- // Window Size the window of data to keep while decoding.
- // Will only be set if HasFCS is false.
- WindowSize uint64
+ // SingleSegment specifies whether the data is to be decompressed into a
+ // single contiguous memory segment.
+ // It implies that WindowSize is invalid and that FrameContentSize is valid.
+ SingleSegment bool
- // Frame content size.
- // Expected size of the entire frame.
- FrameContentSize uint64
+ // WindowSize is the window of data to keep while decoding.
+ // Will only be set if SingleSegment is false.
+ WindowSize uint64
// Dictionary ID.
// If 0, no dictionary.
DictionaryID uint32
+ // HasFCS specifies whether FrameContentSize has a valid value.
+ HasFCS bool
+
+ // FrameContentSize is the expected uncompressed size of the entire frame.
+ FrameContentSize uint64
+
+ // Skippable will be true if the frame is meant to be skipped.
+ // This implies that FirstBlock.OK is false.
+ Skippable bool
+
+ // SkippableID is the user-specific ID for the skippable frame.
+ // Valid values are between 0 to 15, inclusive.
+ SkippableID int
+
+ // SkippableSize is the length of the user data to skip following
+ // the header.
+ SkippableSize uint32
+
+ // HeaderSize is the raw size of the frame header.
+ //
+ // For normal frames, it includes the size of the magic number and
+ // the size of the header (per section 3.1.1.1).
+ // It does not include the size for any data blocks (section 3.1.1.2) nor
+ // the size for the trailing content checksum.
+ //
+ // For skippable frames, this counts the size of the magic number
+ // along with the size of the size field of the payload.
+ // It does not include the size of the skippable payload itself.
+ // The total frame size is the HeaderSize plus the SkippableSize.
+ HeaderSize int
+
// First block information.
FirstBlock struct {
// OK will be set if first block could be decoded.
@@ -51,17 +84,9 @@
CompressedSize int
}
- // Skippable will be true if the frame is meant to be skipped.
- // No other information will be populated.
- Skippable bool
-
// If set there is a checksum present for the block content.
+ // The checksum field at the end is always 4 bytes long.
HasCheckSum bool
-
- // If this is true FrameContentSize will have a valid value
- HasFCS bool
-
- SingleSegment bool
}
// Decode the header from the beginning of the stream.
@@ -71,39 +96,46 @@
// If there isn't enough input, io.ErrUnexpectedEOF is returned.
// The FirstBlock.OK will indicate if enough information was available to decode the first block header.
func (h *Header) Decode(in []byte) error {
+ *h = Header{}
if len(in) < 4 {
return io.ErrUnexpectedEOF
}
+ h.HeaderSize += 4
b, in := in[:4], in[4:]
if !bytes.Equal(b, frameMagic) {
if !bytes.Equal(b[1:4], skippableFrameMagic) || b[0]&0xf0 != 0x50 {
return ErrMagicMismatch
}
- *h = Header{Skippable: true}
+ if len(in) < 4 {
+ return io.ErrUnexpectedEOF
+ }
+ h.HeaderSize += 4
+ h.Skippable = true
+ h.SkippableID = int(b[0] & 0xf)
+ h.SkippableSize = binary.LittleEndian.Uint32(in)
return nil
}
- if len(in) < 1 {
- return io.ErrUnexpectedEOF
- }
-
- // Clear output
- *h = Header{}
- fhd, in := in[0], in[1:]
- h.SingleSegment = fhd&(1<<5) != 0
- h.HasCheckSum = fhd&(1<<2) != 0
-
- if fhd&(1<<3) != 0 {
- return errors.New("reserved bit set on frame header")
- }
// Read Window_Descriptor
// https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#window_descriptor
+ if len(in) < 1 {
+ return io.ErrUnexpectedEOF
+ }
+ fhd, in := in[0], in[1:]
+ h.HeaderSize++
+ h.SingleSegment = fhd&(1<<5) != 0
+ h.HasCheckSum = fhd&(1<<2) != 0
+ if fhd&(1<<3) != 0 {
+ return errors.New("reserved bit set on frame header")
+ }
+
if !h.SingleSegment {
if len(in) < 1 {
return io.ErrUnexpectedEOF
}
var wd byte
wd, in = in[0], in[1:]
+ h.HeaderSize++
windowLog := 10 + (wd >> 3)
windowBase := uint64(1) << windowLog
windowAdd := (windowBase / 8) * uint64(wd&0x7)
@@ -120,9 +152,7 @@
return io.ErrUnexpectedEOF
}
b, in = in[:size], in[size:]
- if b == nil {
- return io.ErrUnexpectedEOF
- }
+ h.HeaderSize += int(size)
switch size {
case 1:
h.DictionaryID = uint32(b[0])
@@ -152,9 +182,7 @@
return io.ErrUnexpectedEOF
}
b, in = in[:fcsSize], in[fcsSize:]
- if b == nil {
- return io.ErrUnexpectedEOF
- }
+ h.HeaderSize += int(fcsSize)
switch fcsSize {
case 1:
h.FrameContentSize = uint64(b[0])