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USBCamera: Normalize property names.

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This commit is contained in:
Peter Johnson
2016-09-20 22:28:48 -07:00
parent d5e5755ff4
commit 7818c3bda3
1 changed files with 21 additions and 2 deletions
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23
src/USBCameraImpl.cpp
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@@ -36,6 +36,22 @@ using namespace cs;
#ifdef __linux__
// Removes non-alphanumeric characters and replaces spaces with underscores.
// e.g. "Zoom, Absolute" -> "zoom_absolute", "Pan (Absolute)" -> "pan_absolute"
static llvm::StringRef NormalizeName(llvm::StringRef name,
llvm::SmallVectorImpl<char>& buf) {
bool newWord = false;
for (auto ch : name) {
if (std::isalnum(ch)) {
if (newWord) buf.push_back('_');
newWord = false;
buf.push_back(std::tolower(ch));
} else if (!buf.empty())
newWord = true;
}
return llvm::StringRef(buf.data(), buf.size());
}
static inline int ControlIdToProperty(__u32 control_id) {
return (control_id & 0xffff) + 1;
}
@@ -72,7 +88,8 @@ USBCameraImpl::PropertyData::PropertyData(
// name
std::size_t len = 0;
while (len < sizeof(ctrl.name) && ctrl.name[len] != '\0') ++len;
name.assign(ctrl.name, len);
llvm::SmallString<64> name_buf;
name = NormalizeName(llvm::StringRef(ctrl.name, len), name_buf);
}
#endif
@@ -106,7 +123,9 @@ USBCameraImpl::PropertyData::PropertyData(const struct v4l2_queryctrl& ctrl)
// name
std::size_t len = 0;
while (len < sizeof(ctrl.name) && ctrl.name[len] != '\0') ++len;
name.assign(reinterpret_cast<const char*>(ctrl.name), len);
llvm::SmallString<64> name_buf;
name = NormalizeName(
llvm::StringRef(reinterpret_cast<const char*>(ctrl.name), len), name_buf);
}
static inline int CheckedIoctl(int fd, unsigned long req, void* data,