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@ -37,9 +37,6 @@ import ( |
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// blocks.
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// "dataLen" is the length of original source data
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func (e *Encoder) Decode(encodedDataBlocks [][]byte, dataLen int) (decodedData []byte, err error) { |
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var decodeMatrix *C.uint8_t |
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var decodeTbls *C.uint8_t |
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var decodeIndex *C.uint32_t |
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var source, target **C.uint8_t |
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k := int(e.params.K) |
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@ -83,9 +80,19 @@ func (e *Encoder) Decode(encodedDataBlocks [][]byte, dataLen int) (decodedData [ |
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} |
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} |
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// Initialzie decoder
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C.minio_init_decoder(missingEncodedBlocksC, C.int(k), C.int(n), C.int(missingEncodedBlocksCount-1), |
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e.encodeMatrix, &decodeMatrix, &decodeTbls, &decodeIndex) |
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// If not already initialized, recompute and cache
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if e.decodeMatrix == nil || e.decodeTbls == nil || e.decodeIndex == nil { |
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var decodeMatrix, decodeTbls *C.uint8_t |
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var decodeIndex *C.uint32_t |
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C.minio_init_decoder(missingEncodedBlocksC, C.int(k), C.int(n), C.int(missingEncodedBlocksCount-1), |
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e.encodeMatrix, &decodeMatrix, &decodeTbls, &decodeIndex) |
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// cache this for future needs
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e.decodeMatrix = decodeMatrix |
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e.decodeTbls = decodeTbls |
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e.decodeIndex = decodeIndex |
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} |
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// Make a slice of pointers to encoded blocks. Necessary to bridge to the C world.
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pointers := make([]*byte, n) |
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@ -95,13 +102,13 @@ func (e *Encoder) Decode(encodedDataBlocks [][]byte, dataLen int) (decodedData [ |
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// Get pointers to source "data" and target "parity" blocks from the output byte array.
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ret := C.minio_get_source_target(C.int(missingEncodedBlocksCount-1), C.int(k), C.int(m), missingEncodedBlocksC, |
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decodeIndex, (**C.uint8_t)(unsafe.Pointer(&pointers[0])), &source, &target) |
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e.decodeIndex, (**C.uint8_t)(unsafe.Pointer(&pointers[0])), &source, &target) |
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if int(ret) == -1 { |
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return nil, errors.New("Unable to decode data") |
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} |
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// Decode data
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C.ec_encode_data(C.int(encodedBlockLen), C.int(k), C.int(missingEncodedBlocksCount-1), decodeTbls, |
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C.ec_encode_data(C.int(encodedBlockLen), C.int(k), C.int(missingEncodedBlocksCount-1), e.decodeTbls, |
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source, target) |
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// Allocate buffer to output buffer
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@ -110,9 +117,5 @@ func (e *Encoder) Decode(encodedDataBlocks [][]byte, dataLen int) (decodedData [ |
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decodedData = append(decodedData, encodedDataBlocks[i]...) |
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} |
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// TODO cache this if necessary
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e.decodeMatrix = decodeMatrix |
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e.decodeTbls = decodeTbls |
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return decodedData[:dataLen], nil |
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} |
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