WIP

1 files changed, 70 insertions, 0 deletions

diff --git a/sax/src/utils.cc b/sax/src/utils.cc
new file mode 100644
index 0000000..f0366d5
--- /dev/null
+++ b/sax/src/utils.cc
@@ -0,0 +1,70 @@
+#include "utils.hh"
+
+#include "decoder.hh"
+#include "sax_decoder.hh"
+#include "sax_decoder_factory.hh"
+
+namespace modxml {
+namespace sax {
+
+namespace {
+
+std::string cleanup_encoding(std::string const& str) {
+  std::string ret;
+  ret.reserve(str.size());
+  for (auto c : str) {
+    if (c >= 'A' && c <= 'Z') {
+      ret.push_back(c | 0x20);
+    } else if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9')) {
+      ret.push_back(c);
+    } else if (c == '.' || c == '_' || c == '-') {
+      ret.push_back('-');
+    }
+  }
+  return ret;
+}
+
+}  // namespace
+
+// Names inspired by:
+// https://www.iana.org/assignments/character-sets/character-sets.xhtml
+std::unique_ptr<Decoder> pick_decoder_for_encoding(
+    std::string const& encoding, DecoderFactory* factory) {
+  auto clean_enc = cleanup_encoding(encoding);
+  if (clean_enc == "utf-8" || clean_enc == "utf8") {
+    return create_utf8_decoder();
+  }
+  if (clean_enc == "utf-16" || clean_enc == "utf16") {
+    return create_utf16_decoder();
+  }
+  if (clean_enc == "utf-16be" || clean_enc == "utf16be") {
+    return create_utf16be_decoder();
+  }
+  if (clean_enc == "utf-16le" || clean_enc == "utf16le") {
+    return create_utf16le_decoder();
+  }
+  if (clean_enc == "utf-32" || clean_enc == "utf32") {
+    return create_utf32_decoder();
+  }
+  if (clean_enc == "utf-32be" || clean_enc == "utf32be") {
+    return create_utf32be_decoder();
+  }
+  if (clean_enc == "utf-32le" || clean_enc == "utf32le") {
+    return create_utf32le_decoder();
+  }
+  if (clean_enc == "ascii" || clean_enc == "us-ascii" ||
+      clean_enc == "usascii" || clean_enc == "iso-ir-6" ||
+      clean_enc == "ansi-x3-4-1968" || clean_enc == "ansi-x3-4-1986" ||
+      clean_enc == "iso-646-irv1991" || clean_enc == "iso646-us" ||
+      clean_enc == "us" || clean_enc == "ibm367" || clean_enc == "cp367") {
+    return create_ascii_decoder();
+  }
+  if (factory) {
+    return factory->create(encoding);
+  }
+  return nullptr;
+}
+
+}  // namespace sax
+
+}  // namespace modxml