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author | 2025-01-14 13:10:39 +0000 | |
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committer | 2025-01-14 13:10:39 +0000 | |
commit | 4d423102c14de9e9328f1852db539d9561a3cad9 (patch) | |
tree | 6df5905f53ad7eadbfa9840939989253bfb4b199 /vendor/google.golang.org/protobuf/internal/protolazy/bufferreader.go | |
parent | [bugfix] migration to cleanup dropped status edits (#3637) (diff) | |
download | gotosocial-4d423102c14de9e9328f1852db539d9561a3cad9.tar.xz |
[chore]: Bump github.com/gin-contrib/gzip from 1.0.1 to 1.1.0 (#3639)
Bumps [github.com/gin-contrib/gzip](https://github.com/gin-contrib/gzip) from 1.0.1 to 1.1.0.
- [Release notes](https://github.com/gin-contrib/gzip/releases)
- [Changelog](https://github.com/gin-contrib/gzip/blob/master/.goreleaser.yaml)
- [Commits](https://github.com/gin-contrib/gzip/compare/v1.0.1...v1.1.0)
---
updated-dependencies:
- dependency-name: github.com/gin-contrib/gzip
dependency-type: direct:production
update-type: version-update:semver-minor
...
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Diffstat (limited to 'vendor/google.golang.org/protobuf/internal/protolazy/bufferreader.go')
-rw-r--r-- | vendor/google.golang.org/protobuf/internal/protolazy/bufferreader.go | 364 |
1 files changed, 364 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 +} |