diff options
Diffstat (limited to 'vendor/go.opentelemetry.io/otel/trace/hex.go')
| -rw-r--r-- | vendor/go.opentelemetry.io/otel/trace/hex.go | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/vendor/go.opentelemetry.io/otel/trace/hex.go b/vendor/go.opentelemetry.io/otel/trace/hex.go new file mode 100644 index 000000000..1cbef1d4b --- /dev/null +++ b/vendor/go.opentelemetry.io/otel/trace/hex.go @@ -0,0 +1,38 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package trace // import "go.opentelemetry.io/otel/trace" + +const ( + // hexLU is a hex lookup table of the 16 lowercase hex digits. + // The character values of the string are indexed at the equivalent + // hexadecimal value they represent. This table efficiently encodes byte data + // into a string representation of hexadecimal. + hexLU = "0123456789abcdef" + + // hexRev is a reverse hex lookup table for lowercase hex digits. + // The table is efficiently decodes a hexadecimal string into bytes. + // Valid hexadecimal characters are indexed at their respective values. All + // other invalid ASCII characters are represented with '\xff'. + // + // The '\xff' character is used as invalid because no valid character has + // the upper 4 bits set. Meaning, an efficient validation can be performed + // over multiple character parsing by checking these bits remain zero. + hexRev = "" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\x0a\x0b\x0c\x0d\x0e\x0f\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" + + "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" +) |