private void ReadData(ByteBuffer bytes)
{
// read the header
ICUBinary.ReadHeader(bytes, FMT, new IsAcceptable());
// read indexes[]
int i, count;
count = bytes.GetInt32();
if (count < IX_TOP)
{
throw new IOException("indexes[0] too small in " + DATA_FILE_NAME);
}
indexes = new int[count];
indexes[0] = count;
for (i = 1; i < count; ++i)
{
indexes[i] = bytes.GetInt32();
}
// read the trie
trie = Trie2_16.CreateFromSerialized(bytes);
int expectedTrieLength = indexes[IX_TRIE_SIZE];
int trieLength = trie.SerializedLength;
if (trieLength > expectedTrieLength)
{
throw new IOException(DATA_FILE_NAME + ": not enough bytes for the trie");
}
// skip padding after trie bytes
ICUBinary.SkipBytes(bytes, expectedTrieLength - trieLength);
// read mirrors[]
count = indexes[IX_MIRROR_LENGTH];
if (count > 0)
{
mirrors = ICUBinary.GetInt32s(bytes, count, 0);
}
// read jgArray[]
count = indexes[IX_JG_LIMIT] - indexes[IX_JG_START];
jgArray = new byte[count];
bytes.Get(jgArray);
// read jgArray2[]
count = indexes[IX_JG_LIMIT2] - indexes[IX_JG_START2];
jgArray2 = new byte[count];
bytes.Get(jgArray2);
}
private void ReadData(ByteBuffer bytes)
{
// read the header
ICUBinary.ReadHeader(bytes, FMT, new IsAcceptable());
// read indexes[]
int count = bytes.GetInt32();
if (count < IX_TOP)
{
throw new IOException("indexes[0] too small in " + DATA_FILE_NAME);
}
indexes = new int[count];
indexes[0] = count;
for (int i = 1; i < count; ++i)
{
indexes[i] = bytes.GetInt32();
}
// read the trie
trie = Trie2_16.CreateFromSerialized(bytes);
int expectedTrieLength = indexes[IX_TRIE_SIZE];
int trieLength = trie.GetSerializedLength();
if (trieLength > expectedTrieLength)
{
throw new IOException(DATA_FILE_NAME + ": not enough bytes for the trie");
}
// skip padding after trie bytes
ICUBinary.SkipBytes(bytes, expectedTrieLength - trieLength);
// read exceptions[]
count = indexes[IX_EXC_LENGTH];
if (count > 0)
{
exceptions = ICUBinary.GetString(bytes, count, 0);
}
// read unfold[]
count = indexes[IX_UNFOLD_LENGTH];
if (count > 0)
{
unfold = ICUBinary.GetChars(bytes, count, 0);
}
}
/// <summary>
/// Create a <see cref="Trie2"/> from its serialized form. Inverse of utrie2_serialize().
/// </summary>
/// <remarks>
/// Reads from the current position and leaves the buffer after the end of the trie.
/// <para/>
/// The serialized format is identical between ICU4C, ICU4J, and ICU4N, so this function
/// will work with serialized <see cref="Trie2"/>s from any.
/// <para/>
/// The actual type of the returned <see cref="Trie2"/> will be either <see cref="Trie2_16"/> or <see cref="Trie2_32"/>, depending
/// on the width of the data.
/// <para/>
/// To obtain the width of the <see cref="Trie2"/>, check the actual class type of the returned <see cref="Trie2"/>.
/// Or use the <see cref="Trie2_16.CreateFromSerialized(ByteBuffer)"/> or <see cref="Trie2_32.CreateFromSerialized(ByteBuffer)"/> method, which will
/// return only <see cref="Trie"/>s of their specific type/size.
/// <para/>
/// The serialized <see cref="Trie2"/> on the stream may be in either little or big endian byte order.
/// This allows using serialized <see cref="Trie"/>s from ICU4C without needing to consider the
/// byte order of the system that created them.
/// </remarks>
/// <param name="bytes">A byte buffer to the serialized form of a UTrie2.</param>
/// <returns>An unserialized <see cref="Trie2"/>, ready for use.</returns>
/// <exception cref="ArgumentException">If the stream does not contain a serialized <see cref="Trie2"/>.</exception>
/// <exception cref="IOException">If a read error occurs in the buffer.</exception>
public static Trie2 CreateFromSerialized(ByteBuffer bytes) // ICU4N TODO: API Create overload that accepts byte[]
{
// From ICU4C utrie2_impl.h
// * Trie2 data structure in serialized form:
// *
// * UTrie2Header header;
// * uint16_t index[header.index2Length];
// * uint16_t data[header.shiftedDataLength<<2]; -- or uint32_t data[...]
// * @internal
// */
// typedef struct UTrie2Header {
// /** "Tri2" in big-endian US-ASCII (0x54726932) */
// uint32_t signature;
// /**
// * options bit field:
// * 15.. 4 reserved (0)
// * 3.. 0 UTrie2ValueBits valueBits
// */
// uint16_t options;
//
// /** UTRIE2_INDEX_1_OFFSET..UTRIE2_MAX_INDEX_LENGTH */
// uint16_t indexLength;
//
// /** (UTRIE2_DATA_START_OFFSET..UTRIE2_MAX_DATA_LENGTH)>>UTRIE2_INDEX_SHIFT */
// uint16_t shiftedDataLength;
//
// /** Null index and data blocks, not shifted. */
// uint16_t index2NullOffset, dataNullOffset;
//
// /**
// * First code point of the single-value range ending with U+10ffff,
// * rounded up and then shifted right by UTRIE2_SHIFT_1.
// */
// uint16_t shiftedHighStart;
// } UTrie2Header;
ByteOrder outerByteOrder = bytes.Order;
try
{
UTrie2Header header = new UTrie2Header();
/* check the signature */
header.signature = bytes.GetInt32();
switch (header.signature)
{
case 0x54726932:
// The buffer is already set to the trie data byte order.
break;
case 0x32697254:
// Temporarily reverse the byte order.
bool isBigEndian = outerByteOrder == ByteOrder.BigEndian;
bytes.Order = isBigEndian ? ByteOrder.LittleEndian : ByteOrder.BigEndian;
header.signature = 0x54726932;
break;
default:
throw new ArgumentException("Buffer does not contain a serialized UTrie2");
}
header.options = bytes.GetChar();
header.indexLength = bytes.GetChar();
header.shiftedDataLength = bytes.GetChar();
header.index2NullOffset = bytes.GetChar();
header.dataNullOffset = bytes.GetChar();
header.shiftedHighStart = bytes.GetChar();
// Trie2 data width - 0: 16 bits
// 1: 32 bits
if ((header.options & UTRIE2_OPTIONS_VALUE_BITS_MASK) > 1)
{
throw new ArgumentException("UTrie2 serialized format error.");
}
ValueWidth width;
Trie2 This;
if ((header.options & UTRIE2_OPTIONS_VALUE_BITS_MASK) == 0)
{
width = ValueWidth.BITS_16;
This = new Trie2_16();
}
else
{
width = ValueWidth.BITS_32;
This = new Trie2_32();
}
This.header = header;
/* get the length values and offsets */
This.indexLength = header.indexLength;
This.dataLength = header.shiftedDataLength << UTRIE2_INDEX_SHIFT;
This.index2NullOffset = header.index2NullOffset;
This.dataNullOffset = header.dataNullOffset;
This.highStart = header.shiftedHighStart << UTRIE2_SHIFT_1;
This.highValueIndex = This.dataLength - UTRIE2_DATA_GRANULARITY;
if (width == ValueWidth.BITS_16)
{
This.highValueIndex += This.indexLength;
}
// Allocate the Trie2 index array. If the data width is 16 bits, the array also
// includes the space for the data.
int indexArraySize = This.indexLength;
if (width == ValueWidth.BITS_16)
{
indexArraySize += This.dataLength;
}
/* Read in the index */
This.index = ICUBinary.GetChars(bytes, indexArraySize, 0);
/* Read in the data. 16 bit data goes in the same array as the index.
* 32 bit data goes in its own separate data array.
*/
if (width == ValueWidth.BITS_16)
{
This.data16 = This.indexLength;
}
else
{
This.data32 = ICUBinary.GetInt32s(bytes, This.dataLength, 0);
}
switch (width)
{
case ValueWidth.BITS_16:
This.data32 = null;
This.initialValue = This.index[This.dataNullOffset];
This.errorValue = This.index[This.data16 + UTRIE2_BAD_UTF8_DATA_OFFSET];
break;
case ValueWidth.BITS_32:
This.data16 = 0;
This.initialValue = This.data32[This.dataNullOffset];
This.errorValue = This.data32[UTRIE2_BAD_UTF8_DATA_OFFSET];
break;
default:
throw new ArgumentException("UTrie2 serialized format error.");
}
return(This);
}
finally
{
bytes.Order = outerByteOrder;
}
}