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//
// Copyright (c) SAS Institute Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package authenticode
// MSI table names are packed in pairs into a Chinese codepoint which then
// becomes 2 bytes of UTF-16. This seems to be an attempt to support longer
// table names than CDF would otherwise allow but it's incredibly silly.
func msiDecodeName(msiName string) string {
out := ""
for _, x := range msiName {
if x >= 0x3800 && x < 0x4800 {
x -= 0x3800
out += string(msiDecodeRune(x&0x3f)) + string(msiDecodeRune(x>>6))
} else if x >= 0x4800 && x < 0x4840 {
x -= 0x4800
out += string(msiDecodeRune(x))
} else if x == 0x4840 {
out += "Table."
} else {
out += string(x)
}
}
return out
}
func msiDecodeRune(x rune) rune {
if x < 10 {
return x + '0'
} else if x < 10+26 {
return x - 10 + 'A'
} else if x < 10+26+26 {
return x - 10 - 26 + 'a'
} else if x == 10+26+26 {
return '.'
} else {
return '_'
}
}
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