diff options
Diffstat (limited to 'deps/node/deps/npm/node_modules/iconv-lite/encodings/dbcs-codec.js')
| -rw-r--r-- | deps/node/deps/npm/node_modules/iconv-lite/encodings/dbcs-codec.js | 554 |
1 files changed, 0 insertions, 554 deletions
diff --git a/deps/node/deps/npm/node_modules/iconv-lite/encodings/dbcs-codec.js b/deps/node/deps/npm/node_modules/iconv-lite/encodings/dbcs-codec.js deleted file mode 100644 index 7a855982..00000000 --- a/deps/node/deps/npm/node_modules/iconv-lite/encodings/dbcs-codec.js +++ /dev/null @@ -1,554 +0,0 @@ -"use strict"; -var Buffer = require("safer-buffer").Buffer; - -// Multibyte codec. In this scheme, a character is represented by 1 or more bytes. -// Our codec supports UTF-16 surrogates, extensions for GB18030 and unicode sequences. -// To save memory and loading time, we read table files only when requested. - -exports._dbcs = DBCSCodec; - -var UNASSIGNED = -1, - GB18030_CODE = -2, - SEQ_START = -10, - NODE_START = -1000, - UNASSIGNED_NODE = new Array(0x100), - DEF_CHAR = -1; - -for (var i = 0; i < 0x100; i++) - UNASSIGNED_NODE[i] = UNASSIGNED; - - -// Class DBCSCodec reads and initializes mapping tables. -function DBCSCodec(codecOptions, iconv) { - this.encodingName = codecOptions.encodingName; - if (!codecOptions) - throw new Error("DBCS codec is called without the data.") - if (!codecOptions.table) - throw new Error("Encoding '" + this.encodingName + "' has no data."); - - // Load tables. - var mappingTable = codecOptions.table(); - - - // Decode tables: MBCS -> Unicode. - - // decodeTables is a trie, encoded as an array of arrays of integers. Internal arrays are trie nodes and all have len = 256. - // Trie root is decodeTables[0]. - // Values: >= 0 -> unicode character code. can be > 0xFFFF - // == UNASSIGNED -> unknown/unassigned sequence. - // == GB18030_CODE -> this is the end of a GB18030 4-byte sequence. - // <= NODE_START -> index of the next node in our trie to process next byte. - // <= SEQ_START -> index of the start of a character code sequence, in decodeTableSeq. - this.decodeTables = []; - this.decodeTables[0] = UNASSIGNED_NODE.slice(0); // Create root node. - - // Sometimes a MBCS char corresponds to a sequence of unicode chars. We store them as arrays of integers here. - this.decodeTableSeq = []; - - // Actual mapping tables consist of chunks. Use them to fill up decode tables. - for (var i = 0; i < mappingTable.length; i++) - this._addDecodeChunk(mappingTable[i]); - - this.defaultCharUnicode = iconv.defaultCharUnicode; - - - // Encode tables: Unicode -> DBCS. - - // `encodeTable` is array mapping from unicode char to encoded char. All its values are integers for performance. - // Because it can be sparse, it is represented as array of buckets by 256 chars each. Bucket can be null. - // Values: >= 0 -> it is a normal char. Write the value (if <=256 then 1 byte, if <=65536 then 2 bytes, etc.). - // == UNASSIGNED -> no conversion found. Output a default char. - // <= SEQ_START -> it's an index in encodeTableSeq, see below. The character starts a sequence. - this.encodeTable = []; - - // `encodeTableSeq` is used when a sequence of unicode characters is encoded as a single code. We use a tree of - // objects where keys correspond to characters in sequence and leafs are the encoded dbcs values. A special DEF_CHAR key - // means end of sequence (needed when one sequence is a strict subsequence of another). - // Objects are kept separately from encodeTable to increase performance. - this.encodeTableSeq = []; - - // Some chars can be decoded, but need not be encoded. - var skipEncodeChars = {}; - if (codecOptions.encodeSkipVals) - for (var i = 0; i < codecOptions.encodeSkipVals.length; i++) { - var val = codecOptions.encodeSkipVals[i]; - if (typeof val === 'number') - skipEncodeChars[val] = true; - else - for (var j = val.from; j <= val.to; j++) - skipEncodeChars[j] = true; - } - - // Use decode trie to recursively fill out encode tables. - this._fillEncodeTable(0, 0, skipEncodeChars); - - // Add more encoding pairs when needed. - if (codecOptions.encodeAdd) { - for (var uChar in codecOptions.encodeAdd) - if (Object.prototype.hasOwnProperty.call(codecOptions.encodeAdd, uChar)) - this._setEncodeChar(uChar.charCodeAt(0), codecOptions.encodeAdd[uChar]); - } - - this.defCharSB = this.encodeTable[0][iconv.defaultCharSingleByte.charCodeAt(0)]; - if (this.defCharSB === UNASSIGNED) this.defCharSB = this.encodeTable[0]['?']; - if (this.defCharSB === UNASSIGNED) this.defCharSB = "?".charCodeAt(0); - - - // Load & create GB18030 tables when needed. - if (typeof codecOptions.gb18030 === 'function') { - this.gb18030 = codecOptions.gb18030(); // Load GB18030 ranges. - - // Add GB18030 decode tables. - var thirdByteNodeIdx = this.decodeTables.length; - var thirdByteNode = this.decodeTables[thirdByteNodeIdx] = UNASSIGNED_NODE.slice(0); - - var fourthByteNodeIdx = this.decodeTables.length; - var fourthByteNode = this.decodeTables[fourthByteNodeIdx] = UNASSIGNED_NODE.slice(0); - - for (var i = 0x81; i <= 0xFE; i++) { - var secondByteNodeIdx = NODE_START - this.decodeTables[0][i]; - var secondByteNode = this.decodeTables[secondByteNodeIdx]; - for (var j = 0x30; j <= 0x39; j++) - secondByteNode[j] = NODE_START - thirdByteNodeIdx; - } - for (var i = 0x81; i <= 0xFE; i++) - thirdByteNode[i] = NODE_START - fourthByteNodeIdx; - for (var i = 0x30; i <= 0x39; i++) - fourthByteNode[i] = GB18030_CODE - } -} - -DBCSCodec.prototype.encoder = DBCSEncoder; -DBCSCodec.prototype.decoder = DBCSDecoder; - -// Decoder helpers -DBCSCodec.prototype._getDecodeTrieNode = function(addr) { - var bytes = []; - for (; addr > 0; addr >>= 8) - bytes.push(addr & 0xFF); - if (bytes.length == 0) - bytes.push(0); - - var node = this.decodeTables[0]; - for (var i = bytes.length-1; i > 0; i--) { // Traverse nodes deeper into the trie. - var val = node[bytes[i]]; - - if (val == UNASSIGNED) { // Create new node. - node[bytes[i]] = NODE_START - this.decodeTables.length; - this.decodeTables.push(node = UNASSIGNED_NODE.slice(0)); - } - else if (val <= NODE_START) { // Existing node. - node = this.decodeTables[NODE_START - val]; - } - else - throw new Error("Overwrite byte in " + this.encodingName + ", addr: " + addr.toString(16)); - } - return node; -} - - -DBCSCodec.prototype._addDecodeChunk = function(chunk) { - // First element of chunk is the hex mbcs code where we start. - var curAddr = parseInt(chunk[0], 16); - - // Choose the decoding node where we'll write our chars. - var writeTable = this._getDecodeTrieNode(curAddr); - curAddr = curAddr & 0xFF; - - // Write all other elements of the chunk to the table. - for (var k = 1; k < chunk.length; k++) { - var part = chunk[k]; - if (typeof part === "string") { // String, write as-is. - for (var l = 0; l < part.length;) { - var code = part.charCodeAt(l++); - if (0xD800 <= code && code < 0xDC00) { // Decode surrogate - var codeTrail = part.charCodeAt(l++); - if (0xDC00 <= codeTrail && codeTrail < 0xE000) - writeTable[curAddr++] = 0x10000 + (code - 0xD800) * 0x400 + (codeTrail - 0xDC00); - else - throw new Error("Incorrect surrogate pair in " + this.encodingName + " at chunk " + chunk[0]); - } - else if (0x0FF0 < code && code <= 0x0FFF) { // Character sequence (our own encoding used) - var len = 0xFFF - code + 2; - var seq = []; - for (var m = 0; m < len; m++) - seq.push(part.charCodeAt(l++)); // Simple variation: don't support surrogates or subsequences in seq. - - writeTable[curAddr++] = SEQ_START - this.decodeTableSeq.length; - this.decodeTableSeq.push(seq); - } - else - writeTable[curAddr++] = code; // Basic char - } - } - else if (typeof part === "number") { // Integer, meaning increasing sequence starting with prev character. - var charCode = writeTable[curAddr - 1] + 1; - for (var l = 0; l < part; l++) - writeTable[curAddr++] = charCode++; - } - else - throw new Error("Incorrect type '" + typeof part + "' given in " + this.encodingName + " at chunk " + chunk[0]); - } - if (curAddr > 0xFF) - throw new Error("Incorrect chunk in " + this.encodingName + " at addr " + chunk[0] + ": too long" + curAddr); -} - -// Encoder helpers -DBCSCodec.prototype._getEncodeBucket = function(uCode) { - var high = uCode >> 8; // This could be > 0xFF because of astral characters. - if (this.encodeTable[high] === undefined) - this.encodeTable[high] = UNASSIGNED_NODE.slice(0); // Create bucket on demand. - return this.encodeTable[high]; -} - -DBCSCodec.prototype._setEncodeChar = function(uCode, dbcsCode) { - var bucket = this._getEncodeBucket(uCode); - var low = uCode & 0xFF; - if (bucket[low] <= SEQ_START) - this.encodeTableSeq[SEQ_START-bucket[low]][DEF_CHAR] = dbcsCode; // There's already a sequence, set a single-char subsequence of it. - else if (bucket[low] == UNASSIGNED) - bucket[low] = dbcsCode; -} - -DBCSCodec.prototype._setEncodeSequence = function(seq, dbcsCode) { - - // Get the root of character tree according to first character of the sequence. - var uCode = seq[0]; - var bucket = this._getEncodeBucket(uCode); - var low = uCode & 0xFF; - - var node; - if (bucket[low] <= SEQ_START) { - // There's already a sequence with - use it. - node = this.encodeTableSeq[SEQ_START-bucket[low]]; - } - else { - // There was no sequence object - allocate a new one. - node = {}; - if (bucket[low] !== UNASSIGNED) node[DEF_CHAR] = bucket[low]; // If a char was set before - make it a single-char subsequence. - bucket[low] = SEQ_START - this.encodeTableSeq.length; - this.encodeTableSeq.push(node); - } - - // Traverse the character tree, allocating new nodes as needed. - for (var j = 1; j < seq.length-1; j++) { - var oldVal = node[uCode]; - if (typeof oldVal === 'object') - node = oldVal; - else { - node = node[uCode] = {} - if (oldVal !== undefined) - node[DEF_CHAR] = oldVal - } - } - - // Set the leaf to given dbcsCode. - uCode = seq[seq.length-1]; - node[uCode] = dbcsCode; -} - -DBCSCodec.prototype._fillEncodeTable = function(nodeIdx, prefix, skipEncodeChars) { - var node = this.decodeTables[nodeIdx]; - for (var i = 0; i < 0x100; i++) { - var uCode = node[i]; - var mbCode = prefix + i; - if (skipEncodeChars[mbCode]) - continue; - - if (uCode >= 0) - this._setEncodeChar(uCode, mbCode); - else if (uCode <= NODE_START) - this._fillEncodeTable(NODE_START - uCode, mbCode << 8, skipEncodeChars); - else if (uCode <= SEQ_START) - this._setEncodeSequence(this.decodeTableSeq[SEQ_START - uCode], mbCode); - } -} - - - -// == Encoder ================================================================== - -function DBCSEncoder(options, codec) { - // Encoder state - this.leadSurrogate = -1; - this.seqObj = undefined; - - // Static data - this.encodeTable = codec.encodeTable; - this.encodeTableSeq = codec.encodeTableSeq; - this.defaultCharSingleByte = codec.defCharSB; - this.gb18030 = codec.gb18030; -} - -DBCSEncoder.prototype.write = function(str) { - var newBuf = Buffer.alloc(str.length * (this.gb18030 ? 4 : 3)), - leadSurrogate = this.leadSurrogate, - seqObj = this.seqObj, nextChar = -1, - i = 0, j = 0; - - while (true) { - // 0. Get next character. - if (nextChar === -1) { - if (i == str.length) break; - var uCode = str.charCodeAt(i++); - } - else { - var uCode = nextChar; - nextChar = -1; - } - - // 1. Handle surrogates. - if (0xD800 <= uCode && uCode < 0xE000) { // Char is one of surrogates. - if (uCode < 0xDC00) { // We've got lead surrogate. - if (leadSurrogate === -1) { - leadSurrogate = uCode; - continue; - } else { - leadSurrogate = uCode; - // Double lead surrogate found. - uCode = UNASSIGNED; - } - } else { // We've got trail surrogate. - if (leadSurrogate !== -1) { - uCode = 0x10000 + (leadSurrogate - 0xD800) * 0x400 + (uCode - 0xDC00); - leadSurrogate = -1; - } else { - // Incomplete surrogate pair - only trail surrogate found. - uCode = UNASSIGNED; - } - - } - } - else if (leadSurrogate !== -1) { - // Incomplete surrogate pair - only lead surrogate found. - nextChar = uCode; uCode = UNASSIGNED; // Write an error, then current char. - leadSurrogate = -1; - } - - // 2. Convert uCode character. - var dbcsCode = UNASSIGNED; - if (seqObj !== undefined && uCode != UNASSIGNED) { // We are in the middle of the sequence - var resCode = seqObj[uCode]; - if (typeof resCode === 'object') { // Sequence continues. - seqObj = resCode; - continue; - - } else if (typeof resCode == 'number') { // Sequence finished. Write it. - dbcsCode = resCode; - - } else if (resCode == undefined) { // Current character is not part of the sequence. - - // Try default character for this sequence - resCode = seqObj[DEF_CHAR]; - if (resCode !== undefined) { - dbcsCode = resCode; // Found. Write it. - nextChar = uCode; // Current character will be written too in the next iteration. - - } else { - // TODO: What if we have no default? (resCode == undefined) - // Then, we should write first char of the sequence as-is and try the rest recursively. - // Didn't do it for now because no encoding has this situation yet. - // Currently, just skip the sequence and write current char. - } - } - seqObj = undefined; - } - else if (uCode >= 0) { // Regular character - var subtable = this.encodeTable[uCode >> 8]; - if (subtable !== undefined) - dbcsCode = subtable[uCode & 0xFF]; - - if (dbcsCode <= SEQ_START) { // Sequence start - seqObj = this.encodeTableSeq[SEQ_START-dbcsCode]; - continue; - } - - if (dbcsCode == UNASSIGNED && this.gb18030) { - // Use GB18030 algorithm to find character(s) to write. - var idx = findIdx(this.gb18030.uChars, uCode); - if (idx != -1) { - var dbcsCode = this.gb18030.gbChars[idx] + (uCode - this.gb18030.uChars[idx]); - newBuf[j++] = 0x81 + Math.floor(dbcsCode / 12600); dbcsCode = dbcsCode % 12600; - newBuf[j++] = 0x30 + Math.floor(dbcsCode / 1260); dbcsCode = dbcsCode % 1260; - newBuf[j++] = 0x81 + Math.floor(dbcsCode / 10); dbcsCode = dbcsCode % 10; - newBuf[j++] = 0x30 + dbcsCode; - continue; - } - } - } - - // 3. Write dbcsCode character. - if (dbcsCode === UNASSIGNED) - dbcsCode = this.defaultCharSingleByte; - - if (dbcsCode < 0x100) { - newBuf[j++] = dbcsCode; - } - else if (dbcsCode < 0x10000) { - newBuf[j++] = dbcsCode >> 8; // high byte - newBuf[j++] = dbcsCode & 0xFF; // low byte - } - else { - newBuf[j++] = dbcsCode >> 16; - newBuf[j++] = (dbcsCode >> 8) & 0xFF; - newBuf[j++] = dbcsCode & 0xFF; - } - } - - this.seqObj = seqObj; - this.leadSurrogate = leadSurrogate; - return newBuf.slice(0, j); -} - -DBCSEncoder.prototype.end = function() { - if (this.leadSurrogate === -1 && this.seqObj === undefined) - return; // All clean. Most often case. - - var newBuf = Buffer.alloc(10), j = 0; - - if (this.seqObj) { // We're in the sequence. - var dbcsCode = this.seqObj[DEF_CHAR]; - if (dbcsCode !== undefined) { // Write beginning of the sequence. - if (dbcsCode < 0x100) { - newBuf[j++] = dbcsCode; - } - else { - newBuf[j++] = dbcsCode >> 8; // high byte - newBuf[j++] = dbcsCode & 0xFF; // low byte - } - } else { - // See todo above. - } - this.seqObj = undefined; - } - - if (this.leadSurrogate !== -1) { - // Incomplete surrogate pair - only lead surrogate found. - newBuf[j++] = this.defaultCharSingleByte; - this.leadSurrogate = -1; - } - - return newBuf.slice(0, j); -} - -// Export for testing -DBCSEncoder.prototype.findIdx = findIdx; - - -// == Decoder ================================================================== - -function DBCSDecoder(options, codec) { - // Decoder state - this.nodeIdx = 0; - this.prevBuf = Buffer.alloc(0); - - // Static data - this.decodeTables = codec.decodeTables; - this.decodeTableSeq = codec.decodeTableSeq; - this.defaultCharUnicode = codec.defaultCharUnicode; - this.gb18030 = codec.gb18030; -} - -DBCSDecoder.prototype.write = function(buf) { - var newBuf = Buffer.alloc(buf.length*2), - nodeIdx = this.nodeIdx, - prevBuf = this.prevBuf, prevBufOffset = this.prevBuf.length, - seqStart = -this.prevBuf.length, // idx of the start of current parsed sequence. - uCode; - - if (prevBufOffset > 0) // Make prev buf overlap a little to make it easier to slice later. - prevBuf = Buffer.concat([prevBuf, buf.slice(0, 10)]); - - for (var i = 0, j = 0; i < buf.length; i++) { - var curByte = (i >= 0) ? buf[i] : prevBuf[i + prevBufOffset]; - - // Lookup in current trie node. - var uCode = this.decodeTables[nodeIdx][curByte]; - - if (uCode >= 0) { - // Normal character, just use it. - } - else if (uCode === UNASSIGNED) { // Unknown char. - // TODO: Callback with seq. - //var curSeq = (seqStart >= 0) ? buf.slice(seqStart, i+1) : prevBuf.slice(seqStart + prevBufOffset, i+1 + prevBufOffset); - i = seqStart; // Try to parse again, after skipping first byte of the sequence ('i' will be incremented by 'for' cycle). - uCode = this.defaultCharUnicode.charCodeAt(0); - } - else if (uCode === GB18030_CODE) { - var curSeq = (seqStart >= 0) ? buf.slice(seqStart, i+1) : prevBuf.slice(seqStart + prevBufOffset, i+1 + prevBufOffset); - var ptr = (curSeq[0]-0x81)*12600 + (curSeq[1]-0x30)*1260 + (curSeq[2]-0x81)*10 + (curSeq[3]-0x30); - var idx = findIdx(this.gb18030.gbChars, ptr); - uCode = this.gb18030.uChars[idx] + ptr - this.gb18030.gbChars[idx]; - } - else if (uCode <= NODE_START) { // Go to next trie node. - nodeIdx = NODE_START - uCode; - continue; - } - else if (uCode <= SEQ_START) { // Output a sequence of chars. - var seq = this.decodeTableSeq[SEQ_START - uCode]; - for (var k = 0; k < seq.length - 1; k++) { - uCode = seq[k]; - newBuf[j++] = uCode & 0xFF; - newBuf[j++] = uCode >> 8; - } - uCode = seq[seq.length-1]; - } - else - throw new Error("iconv-lite internal error: invalid decoding table value " + uCode + " at " + nodeIdx + "/" + curByte); - - // Write the character to buffer, handling higher planes using surrogate pair. - if (uCode > 0xFFFF) { - uCode -= 0x10000; - var uCodeLead = 0xD800 + Math.floor(uCode / 0x400); - newBuf[j++] = uCodeLead & 0xFF; - newBuf[j++] = uCodeLead >> 8; - - uCode = 0xDC00 + uCode % 0x400; - } - newBuf[j++] = uCode & 0xFF; - newBuf[j++] = uCode >> 8; - - // Reset trie node. - nodeIdx = 0; seqStart = i+1; - } - - this.nodeIdx = nodeIdx; - this.prevBuf = (seqStart >= 0) ? buf.slice(seqStart) : prevBuf.slice(seqStart + prevBufOffset); - return newBuf.slice(0, j).toString('ucs2'); -} - -DBCSDecoder.prototype.end = function() { - var ret = ''; - - // Try to parse all remaining chars. - while (this.prevBuf.length > 0) { - // Skip 1 character in the buffer. - ret += this.defaultCharUnicode; - var buf = this.prevBuf.slice(1); - - // Parse remaining as usual. - this.prevBuf = Buffer.alloc(0); - this.nodeIdx = 0; - if (buf.length > 0) - ret += this.write(buf); - } - - this.nodeIdx = 0; - return ret; -} - -// Binary search for GB18030. Returns largest i such that table[i] <= val. -function findIdx(table, val) { - if (table[0] > val) - return -1; - - var l = 0, r = table.length; - while (l < r-1) { // always table[l] <= val < table[r] - var mid = l + Math.floor((r-l+1)/2); - if (table[mid] <= val) - l = mid; - else - r = mid; - } - return l; -} |