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Merge pull request #212 from OffchainLabs/custom-brotli-dictionaries
Custom Brotli Dictionaries
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| // Copyright 2021-2022, Offchain Labs, Inc. | ||
| // For license information, see https://github.com/nitro/blob/master/LICENSE | ||
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| //go:build !wasm | ||
| // +build !wasm | ||
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| package arbcompress | ||
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| /* | ||
| #cgo CFLAGS: -g -Wall -I${SRCDIR}/../target/include/ | ||
| #cgo LDFLAGS: ${SRCDIR}/../target/lib/libstylus.a -lm | ||
| #include "arbitrator.h" | ||
| */ | ||
| import "C" | ||
| import "fmt" | ||
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| type u8 = C.uint8_t | ||
| type u32 = C.uint32_t | ||
| type usize = C.size_t | ||
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| type brotliBool = uint32 | ||
| type brotliBuffer = C.BrotliBuffer | ||
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| const ( | ||
| brotliFalse brotliBool = iota | ||
| brotliTrue | ||
| ) | ||
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| func CompressWell(input []byte) ([]byte, error) { | ||
| return Compress(input, LEVEL_WELL, EmptyDictionary) | ||
| } | ||
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| func Compress(input []byte, level int, dictionary Dictionary) ([]byte, error) { | ||
| maxSize := compressedBufferSizeFor(len(input)) | ||
| output := make([]byte, maxSize) | ||
| outbuf := sliceToBuffer(output) | ||
| inbuf := sliceToBuffer(input) | ||
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| status := C.brotli_compress(inbuf, outbuf, C.Dictionary(dictionary), u32(level)) | ||
| if status != C.BrotliStatus_Success { | ||
| return nil, fmt.Errorf("failed decompression: %d", status) | ||
| } | ||
| output = output[:*outbuf.len] | ||
| return output, nil | ||
| } | ||
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| func Decompress(input []byte, maxSize int) ([]byte, error) { | ||
| return DecompressWithDictionary(input, maxSize, EmptyDictionary) | ||
| } | ||
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| func DecompressWithDictionary(input []byte, maxSize int, dictionary Dictionary) ([]byte, error) { | ||
| output := make([]byte, maxSize) | ||
| outbuf := sliceToBuffer(output) | ||
| inbuf := sliceToBuffer(input) | ||
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| status := C.brotli_decompress(inbuf, outbuf, C.Dictionary(dictionary)) | ||
| if status != C.BrotliStatus_Success { | ||
| return nil, fmt.Errorf("failed decompression: %d", status) | ||
| } | ||
| if *outbuf.len > usize(maxSize) { | ||
| return nil, fmt.Errorf("failed decompression: result too large: %d", *outbuf.len) | ||
| } | ||
| output = output[:*outbuf.len] | ||
| return output, nil | ||
| } | ||
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| func sliceToBuffer(slice []byte) brotliBuffer { | ||
| count := usize(len(slice)) | ||
| if count == 0 { | ||
| slice = []byte{0x00} // ensures pointer is not null (shouldn't be necessary, but brotli docs are picky about NULL) | ||
| } | ||
| return brotliBuffer{ | ||
| ptr: (*u8)(&slice[0]), | ||
| len: &count, | ||
| } | ||
| } |
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