diff options
| -rw-r--r-- | src/buildtool/compatibility/TARGETS | 7 | ||||
| -rw-r--r-- | src/buildtool/compatibility/native_support.hpp | 50 |
2 files changed, 55 insertions, 2 deletions
diff --git a/src/buildtool/compatibility/TARGETS b/src/buildtool/compatibility/TARGETS index fbae7b48..5ef01708 100644 --- a/src/buildtool/compatibility/TARGETS +++ b/src/buildtool/compatibility/TARGETS @@ -1,8 +1,11 @@ { "compatibility": { "type": ["@", "rules", "CC", "library"] , "name": ["compatibility"] - , "hdrs": ["compatibility.hpp"] - , "deps": [["src/buildtool/crypto", "hash_function"]] + , "hdrs": ["compatibility.hpp", "native_support.hpp"] + , "deps": + [ ["src/buildtool/crypto", "hash_function"] + , ["@", "gsl-lite", "", "gsl-lite"] + ] , "stage": ["src", "buildtool", "compatibility"] } } diff --git a/src/buildtool/compatibility/native_support.hpp b/src/buildtool/compatibility/native_support.hpp new file mode 100644 index 00000000..7ec28d40 --- /dev/null +++ b/src/buildtool/compatibility/native_support.hpp @@ -0,0 +1,50 @@ +#ifndef INCLUDED_SRC_BUILDTOOL_COMPATIBILITY_NATIVE_SUPPORT_HPP +#define INCLUDED_SRC_BUILDTOOL_COMPATIBILITY_NATIVE_SUPPORT_HPP + +#include <string> + +#include <gsl-lite/gsl-lite.hpp> + +#include "src/buildtool/compatibility/compatibility.hpp" + +/// \brief Helper functions to support the native remote-execution protocol. +class NativeSupport { + static constexpr std::size_t kTagLength = 2; + static constexpr std::size_t kTaggedLength = 42; + static constexpr auto kBlobTag = "62"; + static constexpr auto kTreeTag = "74"; + + public: + [[nodiscard]] static auto IsPrefixed(std::string const& hash) noexcept + -> bool { + if (Compatibility::IsCompatible()) { + return false; + } + return hash.length() == kTaggedLength; + } + + /// \brief Returns a prefixed hash in case of native remote-execution + /// protocol (0x62 in case of a blob, 0x74 in case of a tree). + [[nodiscard]] static auto Prefix(std::string const& hash, + bool is_tree) noexcept -> std::string { + if (Compatibility::IsCompatible()) { + return hash; + } + gsl_ExpectsAudit(not IsPrefixed(hash)); + return (is_tree ? kTreeTag : kBlobTag) + hash; + } + + [[nodiscard]] static auto Unprefix(std::string const& hash) noexcept + -> std::string { + if (Compatibility::IsCompatible()) { + return hash; + } + gsl_ExpectsAudit(IsPrefixed(hash)); + return hash.substr(kTagLength); + } + + [[nodiscard]] static auto IsTree(std::string const& hash) noexcept -> bool { + return IsPrefixed(hash) and hash.starts_with(kTreeTag); + } +}; +#endif // INCLUDED_SRC_BUILDTOOL_COMPATIBILITY_NATIVE_SUPPORT_HPP |