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zstring: fix encode rountrip for '\' as printable ASCII (#5120)

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This fixes encode roundtripping for all printable ASCII characters.
In particular, this now leaves a plain '\' untouched by the
encoding logic, instead of converting it to escaped hex-digits.
It also adds unit testing covering this specific zstring encoding
property, in order to avoid future regressions.
This commit is contained in:
Luca Bruno 2021-03-23 18:25:59 +00:00 • committed by GitHub
parent 119c5a995b
commit b918f121ef
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 28 additions and 1 deletions
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2
src/util/zstring.cpp
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@ -146,7 +146,7 @@ std::string zstring::encode() const {
#define _flush() if (offset > 0) { buffer[offset] = 0; strm << buffer; offset = 0; }
for (unsigned i = 0; i < m_buffer.size(); ++i) {
unsigned ch = m_buffer[i];
if (ch < 32 || ch >= 128 || ch == '\\') {
if (ch < 32 || ch >= 128) {
_flush();
strm << "\\u{" << std::hex << ch << std::dec << "}";
}