Reader is now using MemoryStream, using tinyendian to fix endianness issues.
This commit is contained in:
Ferdinand Majerech
parent
e9a18c62b0
commit
72afe53ab8
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@ -64,9 +64,9 @@ class ReaderException : YAMLException
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final class Reader
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{
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private:
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//Input stream.
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EndianStream stream_;
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//Allocated space for buffer_.
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// Input stream.
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MemoryStream memStream_;
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// Allocated space for buffer_.
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dchar[] bufferAllocated_ = null;
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// Buffer of currently loaded characters.
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dchar[] buffer_ = null;
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@ -81,6 +81,12 @@ final class Reader
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// Decoder reading data from file and decoding it to UTF-32.
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UTFFastDecoder decoder_;
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version(unittest)
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{
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// Endianness of the input before it was converted (for testing)
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Endian endian_;
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}
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public:
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/// Construct a Reader.
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///
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@ -88,15 +94,18 @@ final class Reader
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///
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/// Throws: ReaderException if the stream is invalid.
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this(Stream stream) @trusted //!nothrow
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in
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{
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assert(stream.readable && stream.seekable,
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"Can't read YAML from a stream that is not readable and seekable");
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auto streamBytes = streamToBytesGC(stream);
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auto result = fixUTFByteOrder(streamBytes);
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if(result.bytesStripped > 0)
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{
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throw new ReaderException("Size of UTF-16 or UTF-32 input not aligned "
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"to 2 or 4 bytes, respectively");
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}
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body
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{
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stream_ = new EndianStream(stream);
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decoder_ = UTFFastDecoder(stream_);
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version(unittest) { endian_ = result.endian; }
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memStream_ = new MemoryStream(result.array);
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decoder_ = UTFFastDecoder(memStream_, result.encoding);
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}
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@trusted nothrow @nogc ~this()
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@ -294,7 +303,7 @@ final class Reader
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void loadChars(size_t chars) @system
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{
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const oldLength = buffer_.length;
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const oldPosition = stream_.position;
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const oldPosition = memStream_.position;
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bufferReserve(buffer_.length + chars);
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buffer_ = bufferAllocated_[0 .. buffer_.length + chars];
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@ -324,7 +333,7 @@ final class Reader
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try{throw e;}
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catch(UTFException e)
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{
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const position = stream_.position;
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const position = memStream_.position;
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throw new ReaderException(format("Unicode decoding error between bytes %s and %s : %s",
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oldPosition, position, e.msg));
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}
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@ -397,8 +406,8 @@ struct UTFBlockDecoder(size_t bufferSize_) if (bufferSize_ % 2 == 0)
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size_t maxChars_;
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// Bytes available in the stream.
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size_t available_;
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//Input stream.
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EndianStream stream_;
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// Input stream.
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MemoryStream stream_;
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// Buffer used to store raw UTF-8 or UTF-16 code points.
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union
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@ -415,60 +424,18 @@ struct UTFBlockDecoder(size_t bufferSize_) if (bufferSize_ % 2 == 0)
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dchar[] buffer_;
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public:
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///Construct a UTFBlockDecoder decoding a stream.
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this(EndianStream stream) @trusted //!nothrow
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/// Construct a UTFBlockDecoder decoding a stream.
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this(MemoryStream stream, UTFEncoding encoding) @trusted
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{
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stream_ = stream;
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available_ = stream_.available;
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//Handle files short enough not to have a BOM.
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if(available_ < 2)
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encoding_ = encoding;
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final switch(encoding_)
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{
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encoding_ = Encoding.UTF_8;
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maxChars_ = 0;
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if(available_ == 1)
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{
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bufferSpace_[0] = stream_.getc();
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buffer_ = bufferSpace_[0 .. 1];
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maxChars_ = 1;
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case UTFEncoding.UTF_8: maxChars_ = available_; break;
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case UTFEncoding.UTF_16: maxChars_ = available_ / 2; break;
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case UTFEncoding.UTF_32: maxChars_ = available_ / 2; break;
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}
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return;
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}
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char[] rawBuffer8;
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wchar[] rawBuffer16;
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//readBOM will determine and set stream endianness.
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switch(stream_.readBOM(2))
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{
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case -1:
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//readBOM() eats two more bytes in this case so get them back.
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const wchar bytes = stream_.getcw();
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rawBuffer8_[0 .. 2] = [cast(ubyte)(bytes % 256), cast(ubyte)(bytes / 256)];
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rawUsed_ = 2;
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goto case 0;
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case 0:
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maxChars_ = available_;
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encoding_ = Encoding.UTF_8;
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break;
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case 1, 2:
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maxChars_ = available_ / 2;
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//readBOM() eats two more bytes in this case so get them back.
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encoding_ = Encoding.UTF_16;
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rawBuffer16_[0] = stream_.getcw();
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rawUsed_ = 1;
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enforce(available_ % 2 == 0,
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new ReaderException("Odd byte count in an UTF-16 stream"));
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break;
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case 3, 4:
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maxChars_ = available_ / 4;
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encoding_ = Encoding.UTF_32;
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enforce(available_ % 4 == 0,
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new ReaderException("Byte count in an UTF-32 stream not divisible by 4"));
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break;
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default: assert(false, "Unknown UTF BOM");
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}
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available_ = stream_.available;
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}
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/// Get maximum number of characters that might be in the stream.
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@ -658,7 +625,7 @@ void testEndian(R)()
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{
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auto reader = new R(new MemoryStream(data));
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assert(reader.encoding == encoding_expected);
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assert(reader.stream_.endian == endian_expected);
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assert(reader.endian_ == endian_expected);
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}
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ubyte[] little_endian_utf_16 = [0xFF, 0xFE, 0x7A, 0x00];
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ubyte[] big_endian_utf_16 = [0xFE, 0xFF, 0x00, 0x7A];
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