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LibTextCodec: Add Latin2 text decoder (#4579)

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Łukasz Maciejewski 2020-12-27 22:44:38 +01:00 committed by GitHub
parent c7911fdce9
commit 518ba73dcb
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GPG key ID: 4AEE18F83AFDEB23
Notes: sideshowbarker 2024-07-19 00:32:48 +09:00 
Author: https://github.com/lukasz-m-maciejewski 🔰
Commit: https://github.com/SerenityOS/serenity/commit/518ba73dcb7
Pull-request: https://github.com/SerenityOS/serenity/pull/4579
2 changed files with 109 additions and 2 deletions
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106
Libraries/LibTextCodec/Decoder.cpp
View file

@ -30,7 +30,8 @@
namespace TextCodec {
static Latin1Decoder& latin1_decoder()
namespace {
Latin1Decoder& latin1_decoder()
{
static Latin1Decoder* decoder;
if (!decoder)
@ -38,7 +39,7 @@ static Latin1Decoder& latin1_decoder()
return *decoder;
}
static UTF8Decoder& utf8_decoder()
UTF8Decoder& utf8_decoder()
{
static UTF8Decoder* decoder;
if (!decoder)
@ -46,6 +47,16 @@ static UTF8Decoder& utf8_decoder()
return *decoder;
}
Latin2Decoder& latin2_decoder()
{
static Latin2Decoder* decoder = nullptr;
if (!decoder)
decoder = new Latin2Decoder;
return *decoder;
}
}
Decoder* decoder_for(const String& a_encoding)
{
auto encoding = get_standardized_encoding(a_encoding);
@ -53,6 +64,8 @@ Decoder* decoder_for(const String& a_encoding)
return &latin1_decoder();
if (encoding.equals_ignoring_case("utf-8"))
return &utf8_decoder();
if (encoding.equals_ignoring_case("iso-8859-2"))
return &latin2_decoder();
dbgln("TextCodec: No decoder implemented for encoding '{}'", a_encoding);
return nullptr;
}
@ -169,4 +182,93 @@ String Latin1Decoder::to_utf8(const StringView& input)
return builder.to_string();
}
namespace {
u32 convert_latin2_to_utf8(u8 in)
{
switch (in) {
#define MAP(X, Y) \
case X: \
return Y
MAP(0xA1, 0x104);
MAP(0xA2, 0x2D8);
MAP(0xA3, 0x141);
MAP(0xA5, 0x13D);
MAP(0xA6, 0x15A);
MAP(0xA9, 0x160);
MAP(0xAA, 0x15E);
MAP(0xAB, 0x164);
MAP(0xAC, 0x179);
MAP(0xAE, 0x17D);
MAP(0xAF, 0x17B);
MAP(0xB1, 0x104);
MAP(0xB2, 0x2BD);
MAP(0xB3, 0x142);
MAP(0xB5, 0x13E);
MAP(0xB6, 0x15B);
MAP(0xB7, 0x2C7);
MAP(0xB9, 0x161);
MAP(0xBA, 0x15F);
MAP(0xBB, 0x165);
MAP(0xBC, 0x17A);
MAP(0xBD, 0x2DD);
MAP(0xBE, 0x17E);
MAP(0xBF, 0x17C);
MAP(0xC0, 0x154);
MAP(0xC3, 0x102);
MAP(0xC5, 0x139);
MAP(0xC6, 0x106);
MAP(0xC8, 0x10C);
MAP(0xCA, 0x118);
MAP(0xCC, 0x11A);
MAP(0xCF, 0x10E);
MAP(0xD0, 0x110);
MAP(0xD1, 0x143);
MAP(0xD2, 0x147);
MAP(0xD5, 0x150);
MAP(0xD8, 0x158);
MAP(0xD9, 0x16E);
MAP(0xDB, 0x170);
MAP(0xDE, 0x162);
MAP(0xE1, 0x155);
MAP(0xE3, 0x103);
MAP(0xE5, 0x13A);
MAP(0xE6, 0x107);
MAP(0xE8, 0x10D);
MAP(0xEA, 0x119);
MAP(0xEC, 0x11B);
MAP(0xEF, 0x10F);
MAP(0xF0, 0x111);
MAP(0xF1, 0x144);
MAP(0xF2, 0x148);
MAP(0xF5, 0x151);
MAP(0xF8, 0x159);
MAP(0xF9, 0x16F);
MAP(0xFB, 0x171);
MAP(0xFE, 0x163);
MAP(0xFF, 0x2D9);
#undef MAP
default:
return in;
}
}
}
String Latin2Decoder::to_utf8(const StringView& input)
{
StringBuilder builder(input.length());
for (auto c : input) {
builder.append_code_point(convert_latin2_to_utf8(c));
}
return builder.to_string();
}
}

5
Libraries/LibTextCodec/Decoder.h
View file

@ -45,6 +45,11 @@ public:
virtual String to_utf8(const StringView&) override;
};
class Latin2Decoder final : public Decoder {
public:
virtual String to_utf8(const StringView&) override;
};
Decoder* decoder_for(const String& encoding);
String get_standardized_encoding(const String& encoding);
bool is_standardized_encoding(const String& encoding);