diff options
Diffstat (limited to 'format/commitgraph/read/layer_parse.go')
| -rw-r--r-- | format/commitgraph/read/layer_parse.go | 276 |
1 files changed, 0 insertions, 276 deletions
diff --git a/format/commitgraph/read/layer_parse.go b/format/commitgraph/read/layer_parse.go deleted file mode 100644 index 13e36c0a..00000000 --- a/format/commitgraph/read/layer_parse.go +++ /dev/null @@ -1,276 +0,0 @@ -package read - -import ( - "encoding/binary" - - "codeberg.org/lindenii/furgit/format/commitgraph" - "codeberg.org/lindenii/furgit/format/commitgraph/bloom" - "codeberg.org/lindenii/furgit/internal/intconv" - objectid "codeberg.org/lindenii/furgit/object/id" -) - -func parseLayer(layer *layer, algo objectid.Algorithm) error { //nolint:maintidx - if len(layer.data) < commitgraph.HeaderSize { - return &MalformedError{Path: layer.path, Reason: "file too short"} - } - - header := layer.data[:commitgraph.HeaderSize] - - signature := binary.BigEndian.Uint32(header[:4]) - if signature != commitgraph.FileSignature { - return &MalformedError{Path: layer.path, Reason: "invalid signature"} - } - - version := header[4] - if version != commitgraph.FileVersion { - return &UnsupportedVersionError{Version: version} - } - - expectedHashVersion, err := intconv.Uint32ToUint8(algo.PackHashID()) - if err != nil { - return err - } - - hashVersion := header[5] - if hashVersion != expectedHashVersion { - return &MalformedError{Path: layer.path, Reason: "hash version does not match object format"} - } - - numChunks := int(header[6]) - baseCount := uint32(header[7]) - - tocLen := (numChunks + 1) * commitgraph.ChunkEntrySize - tocStart := commitgraph.HeaderSize - - tocEnd := tocStart + tocLen - if tocEnd > len(layer.data) { - return &MalformedError{Path: layer.path, Reason: "truncated chunk table"} - } - - type tocEntry struct { - id uint32 - offset uint64 - } - - entries := make([]tocEntry, 0, numChunks+1) - for i := range numChunks + 1 { - entryOff := tocStart + i*commitgraph.ChunkEntrySize - entryData := layer.data[entryOff : entryOff+commitgraph.ChunkEntrySize] - - entry := tocEntry{ - id: binary.BigEndian.Uint32(entryData[:4]), - offset: binary.BigEndian.Uint64(entryData[4:]), - } - entries = append(entries, entry) - } - - if entries[len(entries)-1].id != 0 { - return &MalformedError{Path: layer.path, Reason: "missing chunk table terminator"} - } - - trailerStart := len(layer.data) - algo.Size() - - chunks := make(map[uint32][]byte, numChunks) - for i := range numChunks { - entry := entries[i] - if entry.id == 0 { - return &MalformedError{Path: layer.path, Reason: "early chunk table terminator"} - } - - next := entries[i+1] - - start, err := intconv.Uint64ToInt(entry.offset) - if err != nil { - return err - } - - end, err := intconv.Uint64ToInt(next.offset) - if err != nil { - return err - } - - if start < tocEnd || end < start || end > trailerStart { - return &MalformedError{Path: layer.path, Reason: "invalid chunk offsets"} - } - - if _, exists := chunks[entry.id]; exists { - return &MalformedError{Path: layer.path, Reason: "duplicate chunk id"} - } - - chunks[entry.id] = layer.data[start:end] - } - - oidf := chunks[commitgraph.ChunkOIDF] - if len(oidf) != commitgraph.FanoutSize { - return &MalformedError{Path: layer.path, Reason: "invalid OIDF length"} - } - - layer.chunkOIDFanout = oidf - layer.numCommits = binary.BigEndian.Uint32(oidf[commitgraph.FanoutSize-4:]) - - for i := range 255 { - cur := binary.BigEndian.Uint32(oidf[i*4 : (i+1)*4]) - - next := binary.BigEndian.Uint32(oidf[(i+1)*4 : (i+2)*4]) - if cur > next { - return &MalformedError{Path: layer.path, Reason: "non-monotonic OIDF fanout"} - } - } - - hashSize := algo.Size() - - hashSizeU64, err := intconv.IntToUint64(hashSize) - if err != nil { - return err - } - - oidl := chunks[commitgraph.ChunkOIDL] - oidlWantLen64 := uint64(layer.numCommits) * hashSizeU64 - - oidlWantLen, err := intconv.Uint64ToInt(oidlWantLen64) - if err != nil { - return err - } - - if len(oidl) != oidlWantLen { - return &MalformedError{Path: layer.path, Reason: "invalid OIDL length"} - } - - layer.chunkOIDLookup = oidl - - stride := hashSize + 16 - - strideU64, err := intconv.IntToUint64(stride) - if err != nil { - return err - } - - cdat := chunks[commitgraph.ChunkCDAT] - cdatWantLen64 := uint64(layer.numCommits) * strideU64 - - cdatWantLen, err := intconv.Uint64ToInt(cdatWantLen64) - if err != nil { - return err - } - - if len(cdat) != cdatWantLen { - return &MalformedError{Path: layer.path, Reason: "invalid CDAT length"} - } - - layer.chunkCommit = cdat - - gda2 := chunks[commitgraph.ChunkGDA2] - if len(gda2) != 0 { - wantLen64 := uint64(layer.numCommits) * 4 - - wantLen, err := intconv.Uint64ToInt(wantLen64) - if err != nil { - return err - } - - if len(gda2) != wantLen { - return &MalformedError{Path: layer.path, Reason: "invalid GDA2 length"} - } - - layer.chunkGeneration = gda2 - } - - gdo2 := chunks[commitgraph.ChunkGDO2] - if len(gdo2) != 0 { - if len(gdo2)%8 != 0 { - return &MalformedError{Path: layer.path, Reason: "invalid GDO2 length"} - } - - layer.chunkGenerationOv = gdo2 - } - - edge := chunks[commitgraph.ChunkEDGE] - if len(edge) != 0 { - if len(edge)%4 != 0 { - return &MalformedError{Path: layer.path, Reason: "invalid EDGE length"} - } - - layer.chunkExtraEdges = edge - } - - base := chunks[commitgraph.ChunkBASE] - if baseCount == 0 { - if len(base) != 0 { - return &MalformedError{Path: layer.path, Reason: "unexpected BASE chunk"} - } - } else { - wantLen64 := uint64(baseCount) * hashSizeU64 - - wantLen, err := intconv.Uint64ToInt(wantLen64) - if err != nil { - return err - } - - if len(base) != wantLen { - return &MalformedError{Path: layer.path, Reason: "invalid BASE length"} - } - - layer.chunkBaseGraphs = base - } - - layer.baseCount = baseCount - - bidx := chunks[commitgraph.ChunkBIDX] - - bdat := chunks[commitgraph.ChunkBDAT] - if len(bidx) != 0 || len(bdat) != 0 { //nolint:nestif - if len(bidx) == 0 || len(bdat) == 0 { - return &MalformedError{Path: layer.path, Reason: "BIDX/BDAT must both be present"} - } - - bidxWantLen64 := uint64(layer.numCommits) * 4 - - bidxWantLen, err := intconv.Uint64ToInt(bidxWantLen64) - if err != nil { - return err - } - - if len(bidx) != bidxWantLen { - return &MalformedError{Path: layer.path, Reason: "invalid BIDX length"} - } - - if len(bdat) < bloom.DataHeaderSize { - return &MalformedError{Path: layer.path, Reason: "invalid BDAT length"} - } - - settings, err := bloom.ParseSettings(bdat) - if err != nil { - return err - } - - prev := uint32(0) - - for i := range layer.numCommits { - off := int(i) * 4 - - cur := binary.BigEndian.Uint32(bidx[off : off+4]) - if i > 0 && cur < prev { - return &MalformedError{Path: layer.path, Reason: "non-monotonic BIDX"} - } - - bdatDataLen := len(bdat) - bloom.DataHeaderSize - - bdatDataLenU32, err := intconv.IntToUint32(bdatDataLen) - if err != nil { - return err - } - - if cur > bdatDataLenU32 { - return &MalformedError{Path: layer.path, Reason: "BIDX offset out of range"} - } - - prev = cur - } - - layer.chunkBloomIndex = bidx - layer.chunkBloomData = bdat - layer.bloomSettings = settings - } - - return nil -} |