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[WIP] decompress::Match #1056

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Jul 25, 2023
Merged

[WIP] decompress::Match #1056

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cca0a48
MatchCmp and MatchPrefixCmp added
racytech Jul 24, 2023
32cad7d
comments + MatchPrefixUncompressed
racytech Jul 24, 2023
c12c4f0
lint errors removed
racytech Jul 24, 2023
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101 changes: 100 additions & 1 deletion compress/compress_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -123,6 +123,10 @@ func TestCompressDict1(t *testing.T) {
require.False(t, g.MatchPrefix([]byte("long")))
require.True(t, g.MatchPrefix([]byte("")))
require.True(t, g.MatchPrefix([]byte{}))

require.Equal(t, 1, g.MatchPrefixCmp([]byte("long")))
require.Equal(t, 0, g.MatchPrefixCmp([]byte("")))
require.Equal(t, 0, g.MatchPrefixCmp([]byte{}))
word, _ := g.Next(nil)
require.Nil(t, word)

Expand All @@ -132,6 +136,12 @@ func TestCompressDict1(t *testing.T) {
require.False(t, g.MatchPrefix([]byte("wordnotmatch")))
require.False(t, g.MatchPrefix([]byte("longnotmatch")))
require.True(t, g.MatchPrefix([]byte{}))

require.Equal(t, 0, g.MatchPrefixCmp([]byte("long")))
require.Equal(t, 1, g.MatchPrefixCmp([]byte("longlong")))
require.Equal(t, 1, g.MatchPrefixCmp([]byte("wordnotmatch")))
require.Equal(t, 1, g.MatchPrefixCmp([]byte("longnotmatch")))
require.Equal(t, 0, g.MatchPrefixCmp([]byte{}))
_, _ = g.Next(nil)

// next word is `word`
Expand All @@ -142,6 +152,14 @@ func TestCompressDict1(t *testing.T) {
require.True(t, g.MatchPrefix(nil))
require.False(t, g.MatchPrefix([]byte("wordnotmatch")))
require.False(t, g.MatchPrefix([]byte("longnotmatch")))

require.Equal(t, -1, g.MatchPrefixCmp([]byte("long")))
require.Equal(t, -1, g.MatchPrefixCmp([]byte("longlong")))
require.Equal(t, 0, g.MatchPrefixCmp([]byte("word")))
require.Equal(t, 0, g.MatchPrefixCmp([]byte("")))
require.Equal(t, 0, g.MatchPrefixCmp(nil))
require.Equal(t, 1, g.MatchPrefixCmp([]byte("wordnotmatch")))
require.Equal(t, -1, g.MatchPrefixCmp([]byte("longnotmatch")))
_, _ = g.Next(nil)

// next word is `longlongword %d`
Expand All @@ -154,8 +172,89 @@ func TestCompressDict1(t *testing.T) {
require.False(t, g.MatchPrefix([]byte("wordnotmatch")))
require.False(t, g.MatchPrefix([]byte("longnotmatch")))
require.True(t, g.MatchPrefix([]byte{}))
word, _ = g.Next(nil)

require.Equal(t, 0, g.MatchPrefixCmp([]byte(fmt.Sprintf("%d", i))))
require.Equal(t, 0, g.MatchPrefixCmp([]byte(expectPrefix)))
require.Equal(t, 0, g.MatchPrefixCmp([]byte(expectPrefix+"long")))
require.Equal(t, 0, g.MatchPrefixCmp([]byte(expectPrefix+"longword ")))
require.Equal(t, 1, g.MatchPrefixCmp([]byte("wordnotmatch")))
require.Equal(t, 1, g.MatchPrefixCmp([]byte("longnotmatch")))
require.Equal(t, 0, g.MatchPrefixCmp([]byte{}))
savePos := g.dataP
word, nextPos := g.Next(nil)
expected := fmt.Sprintf("%d longlongword %d", i, i)
g.Reset(savePos)
require.Equal(t, 0, g.MatchCmp([]byte(expected)))
g.Reset(nextPos)
if string(word) != expected {
t.Errorf("expected %s, got (hex) [%s]", expected, word)
}
i++
}

if cs := checksum(d.filePath); cs != 3153486123 {
// it's ok if hash changed, but need re-generate all existing snapshot hashes
// in https://github.com/ledgerwatch/erigon-snapshot
t.Errorf("result file hash changed, %d", cs)
}
}

func TestCompressDictCmp(t *testing.T) {
d := prepareDict(t)
defer d.Close()
g := d.MakeGetter()
i := 0
g.Reset(0)
for g.HasNext() {
// next word is `nil`
savePos := g.dataP
require.Equal(t, 1, g.MatchCmp([]byte("long")))
require.Equal(t, 0, g.MatchCmp([]byte(""))) // moves offset
g.Reset(savePos)
require.Equal(t, 0, g.MatchCmp([]byte{})) // moves offset
g.Reset(savePos)

word, _ := g.Next(nil)
require.Nil(t, word)

// next word is `long`
savePos = g.dataP
require.Equal(t, 0, g.MatchCmp([]byte("long"))) // moves offset
g.Reset(savePos)
require.Equal(t, 1, g.MatchCmp([]byte("longlong")))
require.Equal(t, 1, g.MatchCmp([]byte("wordnotmatch")))
require.Equal(t, 1, g.MatchCmp([]byte("longnotmatch")))
require.Equal(t, -1, g.MatchCmp([]byte{}))
_, _ = g.Next(nil)

// next word is `word`
savePos = g.dataP
require.Equal(t, -1, g.MatchCmp([]byte("long")))
require.Equal(t, -1, g.MatchCmp([]byte("longlong")))
require.Equal(t, 0, g.MatchCmp([]byte("word"))) // moves offset
g.Reset(savePos)
require.Equal(t, -1, g.MatchCmp([]byte("")))
require.Equal(t, -1, g.MatchCmp(nil))
require.Equal(t, 1, g.MatchCmp([]byte("wordnotmatch")))
require.Equal(t, -1, g.MatchCmp([]byte("longnotmatch")))
_, _ = g.Next(nil)

// next word is `longlongword %d`
expectPrefix := fmt.Sprintf("%d long", i)

require.Equal(t, -1, g.MatchCmp([]byte(fmt.Sprintf("%d", i))))
require.Equal(t, -1, g.MatchCmp([]byte(expectPrefix)))
require.Equal(t, -1, g.MatchCmp([]byte(expectPrefix+"long")))
require.Equal(t, -1, g.MatchCmp([]byte(expectPrefix+"longword ")))
require.Equal(t, 1, g.MatchCmp([]byte("wordnotmatch")))
require.Equal(t, 1, g.MatchCmp([]byte("longnotmatch")))
require.Equal(t, -1, g.MatchCmp([]byte{}))
savePos = g.dataP
word, nextPos := g.Next(nil)
expected := fmt.Sprintf("%d longlongword %d", i, i)
g.Reset(savePos)
require.Equal(t, 0, g.MatchCmp([]byte(expected)))
g.Reset(nextPos)
if string(word) != expected {
t.Errorf("expected %s, got (hex) [%s]", expected, word)
}
Expand Down
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