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| -rw-r--r-- | libqpdf/QUtil.cc | 44 | ||||
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| -rw-r--r-- | libtests/qutil.cc | 40 |
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diff --git a/include/qpdf/QUtil.hh b/include/qpdf/QUtil.hh index e8b9e8e1..a6be68f8 100644 --- a/include/qpdf/QUtil.hh +++ b/include/qpdf/QUtil.hh @@ -104,6 +104,14 @@ namespace QUtil QPDF_DLL std::string hex_encode(std::string const&); + // Returns a string that is the result of decoding the input + // string. The input string may consist of mixed case hexadecimal + // digits. Any characters that are not hexadecimal digits will be + // silently ignored. If there are an odd number of hexadecimal + // digits, a trailing 0 will be assumed. + QPDF_DLL + std::string hex_decode(std::string const&); + // Set stdin, stdout to binary mode QPDF_DLL void binary_stdout(); diff --git a/libqpdf/QUtil.cc b/libqpdf/QUtil.cc index 93374568..1cc5449a 100644 --- a/libqpdf/QUtil.cc +++ b/libqpdf/QUtil.cc @@ -290,6 +290,50 @@ QUtil::hex_encode(std::string const& input) return result; } +std::string +QUtil::hex_decode(std::string const& input) +{ + std::string result; + size_t pos = 0; + for (std::string::const_iterator p = input.begin(); p != input.end(); ++p) + { + char ch = *p; + bool skip = false; + if ((*p >= 'A') && (*p <= 'F')) + { + ch -= 'A'; + ch += 10; + } + else if ((*p >= 'a') && (*p <= 'f')) + { + ch -= 'a'; + ch += 10; + } + else if ((*p >= '0') && (*p <= '9')) + { + ch -= '0'; + } + else + { + skip = true; + } + if (! skip) + { + if (pos == 0) + { + result.push_back(ch << 4); + pos = 1; + } + else + { + result.back() += ch; + pos = 0; + } + } + } + return result; +} + void QUtil::binary_stdout() { diff --git a/libtests/qtest/qutil/qutil.out b/libtests/qtest/qutil/qutil.out index c76beb2b..df86c3d6 100644 --- a/libtests/qtest/qutil/qutil.out +++ b/libtests/qtest/qutil/qutil.out @@ -54,3 +54,6 @@ file1: --, file2: -qutil.out-; same: 0: PASS This file is used for qutil testing. It has mixed newlines. 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