diff options
Diffstat (limited to 'vendor/google.golang.org/protobuf/internal/protolazy')
3 files changed, 740 insertions, 0 deletions
diff --git a/vendor/google.golang.org/protobuf/internal/protolazy/bufferreader.go b/vendor/google.golang.org/protobuf/internal/protolazy/bufferreader.go new file mode 100644 index 000000000..82e5cab4a --- /dev/null +++ b/vendor/google.golang.org/protobuf/internal/protolazy/bufferreader.go @@ -0,0 +1,364 @@ +// Copyright 2024 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Helper code for parsing a protocol buffer + +package protolazy + +import ( + "errors" + "fmt" + "io" + + "google.golang.org/protobuf/encoding/protowire" +) + +// BufferReader is a structure encapsulating a protobuf and a current position +type BufferReader struct { + Buf []byte + Pos int +} + +// NewBufferReader creates a new BufferRead from a protobuf +func NewBufferReader(buf []byte) BufferReader { + return BufferReader{Buf: buf, Pos: 0} +} + +var errOutOfBounds = errors.New("protobuf decoding: out of bounds") +var errOverflow = errors.New("proto: integer overflow") + +func (b *BufferReader) DecodeVarintSlow() (x uint64, err error) { + i := b.Pos + l := len(b.Buf) + + for shift := uint(0); shift < 64; shift += 7 { + if i >= l { + err = io.ErrUnexpectedEOF + return + } + v := b.Buf[i] + i++ + x |= (uint64(v) & 0x7F) << shift + if v < 0x80 { + b.Pos = i + return + } + } + + // The number is too large to represent in a 64-bit value. + err = errOverflow + return +} + +// decodeVarint decodes a varint at the current position +func (b *BufferReader) DecodeVarint() (x uint64, err error) { + i := b.Pos + buf := b.Buf + + if i >= len(buf) { + return 0, io.ErrUnexpectedEOF + } else if buf[i] < 0x80 { + b.Pos++ + return uint64(buf[i]), nil + } else if len(buf)-i < 10 { + return b.DecodeVarintSlow() + } + + var v uint64 + // we already checked the first byte + x = uint64(buf[i]) & 127 + i++ + + v = uint64(buf[i]) + i++ + x |= (v & 127) << 7 + if v < 128 { + goto done + } + + v = uint64(buf[i]) + i++ + x |= (v & 127) << 14 + if v < 128 { + goto done + } + + v = uint64(buf[i]) + i++ + x |= (v & 127) << 21 + if v < 128 { + goto done + } + + v = uint64(buf[i]) + i++ + x |= (v & 127) << 28 + if v < 128 { + goto done + } + + v = uint64(buf[i]) + i++ + x |= (v & 127) << 35 + if v < 128 { + goto done + } + + v = uint64(buf[i]) + i++ + x |= (v & 127) << 42 + if v < 128 { + goto done + } + + v = uint64(buf[i]) + i++ + x |= (v & 127) << 49 + if v < 128 { + goto done + } + + v = uint64(buf[i]) + i++ + x |= (v & 127) << 56 + if v < 128 { + goto done + } + + v = uint64(buf[i]) + i++ + x |= (v & 127) << 63 + if v < 128 { + goto done + } + + return 0, errOverflow + +done: + b.Pos = i + return +} + +// decodeVarint32 decodes a varint32 at the current position +func (b *BufferReader) DecodeVarint32() (x uint32, err error) { + i := b.Pos + buf := b.Buf + + if i >= len(buf) { + return 0, io.ErrUnexpectedEOF + } else if buf[i] < 0x80 { + b.Pos++ + return uint32(buf[i]), nil + } else if len(buf)-i < 5 { + v, err := b.DecodeVarintSlow() + return uint32(v), err + } + + var v uint32 + // we already checked the first byte + x = uint32(buf[i]) & 127 + i++ + + v = uint32(buf[i]) + i++ + x |= (v & 127) << 7 + if v < 128 { + goto done + } + + v = uint32(buf[i]) + i++ + x |= (v & 127) << 14 + if v < 128 { + goto done + } + + v = uint32(buf[i]) + i++ + x |= (v & 127) << 21 + if v < 128 { + goto done + } + + v = uint32(buf[i]) + i++ + x |= (v & 127) << 28 + if v < 128 { + goto done + } + + return 0, errOverflow + +done: + b.Pos = i + return +} + +// skipValue skips a value in the protobuf, based on the specified tag +func (b *BufferReader) SkipValue(tag uint32) (err error) { + wireType := tag & 0x7 + switch protowire.Type(wireType) { + case protowire.VarintType: + err = b.SkipVarint() + case protowire.Fixed64Type: + err = b.SkipFixed64() + case protowire.BytesType: + var n uint32 + n, err = b.DecodeVarint32() + if err == nil { + err = b.Skip(int(n)) + } + case protowire.StartGroupType: + err = b.SkipGroup(tag) + case protowire.Fixed32Type: + err = b.SkipFixed32() + default: + err = fmt.Errorf("Unexpected wire type (%d)", wireType) + } + return +} + +// skipGroup skips a group with the specified tag. It executes efficiently using a tag stack +func (b *BufferReader) SkipGroup(tag uint32) (err error) { + tagStack := make([]uint32, 0, 16) + tagStack = append(tagStack, tag) + var n uint32 + for len(tagStack) > 0 { + tag, err = b.DecodeVarint32() + if err != nil { + return err + } + switch protowire.Type(tag & 0x7) { + case protowire.VarintType: + err = b.SkipVarint() + case protowire.Fixed64Type: + err = b.Skip(8) + case protowire.BytesType: + n, err = b.DecodeVarint32() + if err == nil { + err = b.Skip(int(n)) + } + case protowire.StartGroupType: + tagStack = append(tagStack, tag) + case protowire.Fixed32Type: + err = b.SkipFixed32() + case protowire.EndGroupType: + if protoFieldNumber(tagStack[len(tagStack)-1]) == protoFieldNumber(tag) { + tagStack = tagStack[:len(tagStack)-1] + } else { + err = fmt.Errorf("end group tag %d does not match begin group tag %d at pos %d", + protoFieldNumber(tag), protoFieldNumber(tagStack[len(tagStack)-1]), b.Pos) + } + } + if err != nil { + return err + } + } + return nil +} + +// skipVarint effiently skips a varint +func (b *BufferReader) SkipVarint() (err error) { + i := b.Pos + + if len(b.Buf)-i < 10 { + // Use DecodeVarintSlow() to check for buffer overflow, but ignore result + if _, err := b.DecodeVarintSlow(); err != nil { + return err + } + return nil + } + + if b.Buf[i] < 0x80 { + goto out + } + i++ + + if b.Buf[i] < 0x80 { + goto out + } + i++ + + if b.Buf[i] < 0x80 { + goto out + } + i++ + + if b.Buf[i] < 0x80 { + goto out + } + i++ + + if b.Buf[i] < 0x80 { + goto out + } + i++ + + if b.Buf[i] < 0x80 { + goto out + } + i++ + + if b.Buf[i] < 0x80 { + goto out + } + i++ + + if b.Buf[i] < 0x80 { + goto out + } + i++ + + if b.Buf[i] < 0x80 { + goto out + } + i++ + + if b.Buf[i] < 0x80 { + goto out + } + return errOverflow + +out: + b.Pos = i + 1 + return nil +} + +// skip skips the specified number of bytes +func (b *BufferReader) Skip(n int) (err error) { + if len(b.Buf) < b.Pos+n { + return io.ErrUnexpectedEOF + } + b.Pos += n + return +} + +// skipFixed64 skips a fixed64 +func (b *BufferReader) SkipFixed64() (err error) { + return b.Skip(8) +} + +// skipFixed32 skips a fixed32 +func (b *BufferReader) SkipFixed32() (err error) { + return b.Skip(4) +} + +// skipBytes skips a set of bytes +func (b *BufferReader) SkipBytes() (err error) { + n, err := b.DecodeVarint32() + if err != nil { + return err + } + return b.Skip(int(n)) +} + +// Done returns whether we are at the end of the protobuf +func (b *BufferReader) Done() bool { + return b.Pos == len(b.Buf) +} + +// Remaining returns how many bytes remain +func (b *BufferReader) Remaining() int { + return len(b.Buf) - b.Pos +} diff --git a/vendor/google.golang.org/protobuf/internal/protolazy/lazy.go b/vendor/google.golang.org/protobuf/internal/protolazy/lazy.go new file mode 100644 index 000000000..ff4d4834b --- /dev/null +++ b/vendor/google.golang.org/protobuf/internal/protolazy/lazy.go @@ -0,0 +1,359 @@ +// Copyright 2024 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package protolazy contains internal data structures for lazy message decoding. +package protolazy + +import ( + "fmt" + "sort" + + "google.golang.org/protobuf/encoding/protowire" + piface "google.golang.org/protobuf/runtime/protoiface" +) + +// IndexEntry is the structure for an index of the fields in a message of a +// proto (not descending to sub-messages) +type IndexEntry struct { + FieldNum uint32 + // first byte of this tag/field + Start uint32 + // first byte after a contiguous sequence of bytes for this tag/field, which could + // include a single encoding of the field, or multiple encodings for the field + End uint32 + // True if this protobuf segment includes multiple encodings of the field + MultipleContiguous bool +} + +// XXX_lazyUnmarshalInfo has information about a particular lazily decoded message +// +// Deprecated: Do not use. This will be deleted in the near future. +type XXX_lazyUnmarshalInfo struct { + // Index of fields and their positions in the protobuf for this + // message. Make index be a pointer to a slice so it can be updated + // atomically. The index pointer is only set once (lazily when/if + // the index is first needed), and must always be SET and LOADED + // ATOMICALLY. + index *[]IndexEntry + // The protobuf associated with this lazily decoded message. It is + // only set during proto.Unmarshal(). It doesn't need to be set and + // loaded atomically, since any simultaneous set (Unmarshal) and read + // (during a get) would already be a race in the app code. + Protobuf []byte + // The flags present when Unmarshal was originally called for this particular message + unmarshalFlags piface.UnmarshalInputFlags +} + +// The Buffer and SetBuffer methods let v2/internal/impl interact with +// XXX_lazyUnmarshalInfo via an interface, to avoid an import cycle. + +// Buffer returns the lazy unmarshal buffer. +// +// Deprecated: Do not use. This will be deleted in the near future. +func (lazy *XXX_lazyUnmarshalInfo) Buffer() []byte { + return lazy.Protobuf +} + +// SetBuffer sets the lazy unmarshal buffer. +// +// Deprecated: Do not use. This will be deleted in the near future. +func (lazy *XXX_lazyUnmarshalInfo) SetBuffer(b []byte) { + lazy.Protobuf = b +} + +// SetUnmarshalFlags is called to set a copy of the original unmarshalInputFlags. +// The flags should reflect how Unmarshal was called. +func (lazy *XXX_lazyUnmarshalInfo) SetUnmarshalFlags(f piface.UnmarshalInputFlags) { + lazy.unmarshalFlags = f +} + +// UnmarshalFlags returns the original unmarshalInputFlags. +func (lazy *XXX_lazyUnmarshalInfo) UnmarshalFlags() piface.UnmarshalInputFlags { + return lazy.unmarshalFlags +} + +// AllowedPartial returns true if the user originally unmarshalled this message with +// AllowPartial set to true +func (lazy *XXX_lazyUnmarshalInfo) AllowedPartial() bool { + return (lazy.unmarshalFlags & piface.UnmarshalCheckRequired) == 0 +} + +func protoFieldNumber(tag uint32) uint32 { + return tag >> 3 +} + +// buildIndex builds an index of the specified protobuf, return the index +// array and an error. +func buildIndex(buf []byte) ([]IndexEntry, error) { + index := make([]IndexEntry, 0, 16) + var lastProtoFieldNum uint32 + var outOfOrder bool + + var r BufferReader = NewBufferReader(buf) + + for !r.Done() { + var tag uint32 + var err error + var curPos = r.Pos + // INLINED: tag, err = r.DecodeVarint32() + { + i := r.Pos + buf := r.Buf + + if i >= len(buf) { + return nil, errOutOfBounds + } else if buf[i] < 0x80 { + r.Pos++ + tag = uint32(buf[i]) + } else if r.Remaining() < 5 { + var v uint64 + v, err = r.DecodeVarintSlow() + tag = uint32(v) + } else { + var v uint32 + // we already checked the first byte + tag = uint32(buf[i]) & 127 + i++ + + v = uint32(buf[i]) + i++ + tag |= (v & 127) << 7 + if v < 128 { + goto done + } + + v = uint32(buf[i]) + i++ + tag |= (v & 127) << 14 + if v < 128 { + goto done + } + + v = uint32(buf[i]) + i++ + tag |= (v & 127) << 21 + if v < 128 { + goto done + } + + v = uint32(buf[i]) + i++ + tag |= (v & 127) << 28 + if v < 128 { + goto done + } + + return nil, errOutOfBounds + + done: + r.Pos = i + } + } + // DONE: tag, err = r.DecodeVarint32() + + fieldNum := protoFieldNumber(tag) + if fieldNum < lastProtoFieldNum { + outOfOrder = true + } + + // Skip the current value -- will skip over an entire group as well. + // INLINED: err = r.SkipValue(tag) + wireType := tag & 0x7 + switch protowire.Type(wireType) { + case protowire.VarintType: + // INLINED: err = r.SkipVarint() + i := r.Pos + + if len(r.Buf)-i < 10 { + // Use DecodeVarintSlow() to skip while + // checking for buffer overflow, but ignore result + _, err = r.DecodeVarintSlow() + goto out2 + } + if r.Buf[i] < 0x80 { + goto out + } + i++ + + if r.Buf[i] < 0x80 { + goto out + } + i++ + + if r.Buf[i] < 0x80 { + goto out + } + i++ + + if r.Buf[i] < 0x80 { + goto out + } + i++ + + if r.Buf[i] < 0x80 { + goto out + } + i++ + + if r.Buf[i] < 0x80 { + goto out + } + i++ + + if r.Buf[i] < 0x80 { + goto out + } + i++ + + if r.Buf[i] < 0x80 { + goto out + } + i++ + + if r.Buf[i] < 0x80 { + goto out + } + i++ + + if r.Buf[i] < 0x80 { + goto out + } + return nil, errOverflow + out: + r.Pos = i + 1 + // DONE: err = r.SkipVarint() + case protowire.Fixed64Type: + err = r.SkipFixed64() + case protowire.BytesType: + var n uint32 + n, err = r.DecodeVarint32() + if err == nil { + err = r.Skip(int(n)) + } + case protowire.StartGroupType: + err = r.SkipGroup(tag) + case protowire.Fixed32Type: + err = r.SkipFixed32() + default: + err = fmt.Errorf("Unexpected wire type (%d)", wireType) + } + // DONE: err = r.SkipValue(tag) + + out2: + if err != nil { + return nil, err + } + if fieldNum != lastProtoFieldNum { + index = append(index, IndexEntry{FieldNum: fieldNum, + Start: uint32(curPos), + End: uint32(r.Pos)}, + ) + } else { + index[len(index)-1].End = uint32(r.Pos) + index[len(index)-1].MultipleContiguous = true + } + lastProtoFieldNum = fieldNum + } + if outOfOrder { + sort.Slice(index, func(i, j int) bool { + return index[i].FieldNum < index[j].FieldNum || + (index[i].FieldNum == index[j].FieldNum && + index[i].Start < index[j].Start) + }) + } + return index, nil +} + +func (lazy *XXX_lazyUnmarshalInfo) SizeField(num uint32) (size int) { + start, end, found, _, multipleEntries := lazy.FindFieldInProto(num) + if multipleEntries != nil { + for _, entry := range multipleEntries { + size += int(entry.End - entry.Start) + } + return size + } + if !found { + return 0 + } + return int(end - start) +} + +func (lazy *XXX_lazyUnmarshalInfo) AppendField(b []byte, num uint32) ([]byte, bool) { + start, end, found, _, multipleEntries := lazy.FindFieldInProto(num) + if multipleEntries != nil { + for _, entry := range multipleEntries { + b = append(b, lazy.Protobuf[entry.Start:entry.End]...) + } + return b, true + } + if !found { + return nil, false + } + b = append(b, lazy.Protobuf[start:end]...) + return b, true +} + +func (lazy *XXX_lazyUnmarshalInfo) SetIndex(index []IndexEntry) { + atomicStoreIndex(&lazy.index, &index) +} + +// FindFieldInProto looks for field fieldNum in lazyUnmarshalInfo information +// (including protobuf), returns startOffset/endOffset/found. +func (lazy *XXX_lazyUnmarshalInfo) FindFieldInProto(fieldNum uint32) (start, end uint32, found, multipleContiguous bool, multipleEntries []IndexEntry) { + if lazy.Protobuf == nil { + // There is no backing protobuf for this message -- it was made from a builder + return 0, 0, false, false, nil + } + index := atomicLoadIndex(&lazy.index) + if index == nil { + r, err := buildIndex(lazy.Protobuf) + if err != nil { + panic(fmt.Sprintf("findFieldInfo: error building index when looking for field %d: %v", fieldNum, err)) + } + // lazy.index is a pointer to the slice returned by BuildIndex + index = &r + atomicStoreIndex(&lazy.index, index) + } + return lookupField(index, fieldNum) +} + +// lookupField returns the offset at which the indicated field starts using +// the index, offset immediately after field ends (including all instances of +// a repeated field), and bools indicating if field was found and if there +// are multiple encodings of the field in the byte range. +// +// To hande the uncommon case where there are repeated encodings for the same +// field which are not consecutive in the protobuf (so we need to returns +// multiple start/end offsets), we also return a slice multipleEntries. If +// multipleEntries is non-nil, then multiple entries were found, and the +// values in the slice should be used, rather than start/end/found. +func lookupField(indexp *[]IndexEntry, fieldNum uint32) (start, end uint32, found bool, multipleContiguous bool, multipleEntries []IndexEntry) { + // The pointer indexp to the index was already loaded atomically. + // The slice is uniquely associated with the pointer, so it doesn't + // need to be loaded atomically. + index := *indexp + for i, entry := range index { + if fieldNum == entry.FieldNum { + if i < len(index)-1 && entry.FieldNum == index[i+1].FieldNum { + // Handle the uncommon case where there are + // repeated entries for the same field which + // are not contiguous in the protobuf. + multiple := make([]IndexEntry, 1, 2) + multiple[0] = IndexEntry{fieldNum, entry.Start, entry.End, entry.MultipleContiguous} + i++ + for i < len(index) && index[i].FieldNum == fieldNum { + multiple = append(multiple, IndexEntry{fieldNum, index[i].Start, index[i].End, index[i].MultipleContiguous}) + i++ + } + return 0, 0, false, false, multiple + + } + return entry.Start, entry.End, true, entry.MultipleContiguous, nil + } + if fieldNum < entry.FieldNum { + return 0, 0, false, false, nil + } + } + return 0, 0, false, false, nil +} diff --git a/vendor/google.golang.org/protobuf/internal/protolazy/pointer_unsafe.go b/vendor/google.golang.org/protobuf/internal/protolazy/pointer_unsafe.go new file mode 100644 index 000000000..dc2a64ca6 --- /dev/null +++ b/vendor/google.golang.org/protobuf/internal/protolazy/pointer_unsafe.go @@ -0,0 +1,17 @@ +// Copyright 2024 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package protolazy + +import ( + "sync/atomic" + "unsafe" +) + +func atomicLoadIndex(p **[]IndexEntry) *[]IndexEntry { + return (*[]IndexEntry)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(p)))) +} +func atomicStoreIndex(p **[]IndexEntry, v *[]IndexEntry) { + atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(p)), unsafe.Pointer(v)) +} |