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lookChar refactoring

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This commit is contained in:
Yury Delendik 2013-06-30 15:45:15 -05:00
parent ba87d2fe11
commit 19e8f2f059
8 changed files with 251 additions and 272 deletions
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65
src/stream.js
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@ -37,7 +37,7 @@ var Stream = (function StreamClosure() {
},
getByte: function Stream_getByte() {
if (this.pos >= this.end)
return null;
return -1;
return this.bytes[this.pos++];
},
// returns subarray of original buffer
@ -62,16 +62,6 @@ var Stream = (function StreamClosure() {
this.pos -= bytes.length;
return bytes;
},
lookChar: function Stream_lookChar() {
if (this.pos >= this.end)
return null;
return String.fromCharCode(this.bytes[this.pos]);
},
getChar: function Stream_getChar() {
if (this.pos >= this.end)
return null;
return String.fromCharCode(this.bytes[this.pos++]);
},
skip: function Stream_skip(n) {
if (!n)
n = 1;
@ -133,7 +123,7 @@ var DecodeStream = (function DecodeStreamClosure() {
var pos = this.pos;
while (this.bufferLength <= pos) {
if (this.eof)
return null;
return -1;
this.readBlock();
}
return this.buffer[this.pos++];
@ -171,31 +161,13 @@ var DecodeStream = (function DecodeStreamClosure() {
this.pos -= bytes.length;
return bytes;
},
lookChar: function DecodeStream_lookChar() {
var pos = this.pos;
while (this.bufferLength <= pos) {
if (this.eof)
return null;
this.readBlock();
}
return String.fromCharCode(this.buffer[this.pos]);
},
getChar: function DecodeStream_getChar() {
var pos = this.pos;
while (this.bufferLength <= pos) {
if (this.eof)
return null;
this.readBlock();
}
return String.fromCharCode(this.buffer[this.pos++]);
},
makeSubStream: function DecodeStream_makeSubStream(start, length, dict) {
var end = start + length;
while (this.bufferLength <= end && !this.eof)
this.readBlock();
return new Stream(this.buffer, start, length, dict);
},
skip: function DecodeStream_skip(n) {
skip: function Stream_skip(n) {
if (!n)
n = 1;
this.pos += n;
@ -882,9 +854,6 @@ var JpegStream = (function JpegStreamClosure() {
JpegStream.prototype.getIR = function JpegStream_getIR() {
return bytesToString(this.bytes);
};
JpegStream.prototype.getChar = function JpegStream_getChar() {
error('internal error: getChar is not valid on JpegStream');
};
/**
* Checks if the image can be decoded and displayed by the browser without any
* further processing such as color space conversions.
@ -1012,9 +981,6 @@ var JpxStream = (function JpxStreamClosure() {
this.bufferLength = data.length;
this.eof = true;
};
JpxStream.prototype.getChar = function JpxStream_getChar() {
error('internal error: getChar is not valid on JpxStream');
};
return JpxStream;
})();
@ -1057,9 +1023,6 @@ var Jbig2Stream = (function Jbig2StreamClosure() {
this.bufferLength = dataLength;
this.eof = true;
};
Jbig2Stream.prototype.getChar = function Jbig2Stream_getChar() {
error('internal error: getChar is not valid on Jbig2Stream');
};
return Jbig2Stream;
})();
@ -1120,15 +1083,18 @@ var Ascii85Stream = (function Ascii85StreamClosure() {
Ascii85Stream.prototype = Object.create(DecodeStream.prototype);
Ascii85Stream.prototype.readBlock = function Ascii85Stream_readBlock() {
var tildaCode = '~'.charCodeAt(0);
var zCode = 'z'.charCodeAt(0);
var TILDA_CHAR = 0x7E; // '~'
var Z_LOWER_CHAR = 0x7A; // 'z'
var EOF = -1;
var str = this.str;
var c = str.getByte();
while (Lexer.isSpace(String.fromCharCode(c)))
while (Lexer.isSpace(c)) {
c = str.getByte();
}
if (!c || c === tildaCode) {
if (c === EOF || c === TILDA_CHAR) {
this.eof = true;
return;
}
@ -1136,7 +1102,7 @@ var Ascii85Stream = (function Ascii85StreamClosure() {
var bufferLength = this.bufferLength, buffer;
// special code for z
if (c == zCode) {
if (c == Z_LOWER_CHAR) {
buffer = this.ensureBuffer(bufferLength + 4);
for (var i = 0; i < 4; ++i)
buffer[bufferLength + i] = 0;
@ -1146,12 +1112,13 @@ var Ascii85Stream = (function Ascii85StreamClosure() {
input[0] = c;
for (var i = 1; i < 5; ++i) {
c = str.getByte();
while (Lexer.isSpace(String.fromCharCode(c)))
while (Lexer.isSpace(c)) {
c = str.getByte();
}
input[i] = c;
if (!c || c == tildaCode)
if (c === EOF || c == TILDA_CHAR)
break;
}
buffer = this.ensureBuffer(bufferLength + i - 1);
@ -2239,7 +2206,7 @@ var CCITTFaxStream = (function CCITTFaxStreamClosure() {
CCITTFaxStream.prototype.lookBits = function CCITTFaxStream_lookBits(n) {
var c;
while (this.inputBits < n) {
if ((c = this.str.getByte()) === null || c === undefined) {
if ((c = this.str.getByte()) === -1) {
if (this.inputBits === 0)
return EOF;
return ((this.inputBuf << (n - this.inputBits)) &
@ -2293,7 +2260,7 @@ var LZWStream = (function LZWStreamClosure() {
var cachedData = this.cachedData;
while (bitsCached < n) {
var c = this.str.getByte();
if (c === null || c === undefined) {
if (c === -1) {
this.eof = true;
return null;
}