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net/http: better comment in hasToken

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R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6249065
This commit is contained in:
Brad Fitzpatrick 2012-05-29 14:27:07 -07:00
parent 2d1fa08967
commit 253d7f0460
1 changed files with 5 additions and 0 deletions
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5
src/pkg/net/http/header.go
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@ -99,6 +99,11 @@ func hasToken(v, token string) bool {
} }
for sp := 0; sp <= len(v)-len(token); sp++ { for sp := 0; sp <= len(v)-len(token); sp++ {
// Check that first character is good. // Check that first character is good.
// The token is ASCII, so checking only a single byte
// is sufficient. We skip this potential starting
// position if both the first byte and its potential
// ASCII uppercase equivalent (b|0x20) don't match.
// False positives ('^' => '~') are caught by EqualFold.
if b := v[sp]; b != token[0] && b|0x20 != token[0] { if b := v[sp]; b != token[0] && b|0x20 != token[0] {
continue continue
} }