Sakurai/pdf.js
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Refactor duplicate code in getTwoDimCode function.

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Also reuse the existing findTableCode function for it.
This commit is contained in:
Kalervo Kujala 2011-10-19 22:58:03 +03:00
parent 56ae32e856
commit 0a83c2661d
1 changed files with 34 additions and 34 deletions
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68
pdf.js
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@ -1994,6 +1994,33 @@ var CCITTFaxStream = (function ccittFaxStream() {
return this.buf; return this.buf;
}; };
// This functions returns the code found from the table.
// The start and end parameters set the boundaries for searching the table.
// The limit parameter is optional. Function returns an array with three
// values. The first array element indicates whether a valid code is being
// returned. The second array element is the actual code. The third array
// element indicates whether EOF was reached.
var findTableCode = function ccittFaxStreamFindTableCode(start, end, table,
limit) {
var limitValue = limit || 0;
for (var i = start; i <= end; ++i) {
var code = this.lookBits(i);
if (code == EOF)
return [true, 1, false];
if (i < end)
code <<= end - i;
if (!limitValue || code >= limitValue) {
var p = table[code - limitValue];
if (p[0] == i) {
this.eatBits(i);
return [true, p[1], true];
}
}
}
return [false, 0, false];
};
constructor.prototype.getTwoDimCode = function ccittFaxStreamGetTwoDimCode() { constructor.prototype.getTwoDimCode = function ccittFaxStreamGetTwoDimCode() {
var code = 0; var code = 0;
var p; var p;
@ -2005,41 +2032,14 @@ var CCITTFaxStream = (function ccittFaxStream() {
return p[1]; return p[1];
} }
} else { } else {
for (var n = 1; n <= 7; ++n) { var result = findTableCode(1, 7, twoDimTable);
code = this.lookBits(n); if (result[0] && result[2])
if (n < 7) { return result[1];
code <<= 7 - n;
}
p = twoDimTable[code];
if (p[0] == n) {
this.eatBits(n);
return p[1];
}
}
} }
warn('Bad two dim code'); warn('Bad two dim code');
return EOF; return EOF;
}; };
var findTableCode = function ccittFaxStreamFindTableCode(start, end, table,
limit) {
for (var i = start; i <= end; ++i) {
var code = this.lookBits(i);
if (code == EOF)
return [true, 1];
if (i < end)
code <<= end - i;
if (code >= limit) {
var p = table[code - ((limit == ccittEOL) ? 0 : limit)];
if (p[0] == i) {
this.eatBits(i);
return [true, p[1]];
}
}
}
return [false, 0];
};
constructor.prototype.getWhiteCode = function ccittFaxStreamGetWhiteCode() { constructor.prototype.getWhiteCode = function ccittFaxStreamGetWhiteCode() {
var code = 0; var code = 0;
var p; var p;
@ -2059,11 +2059,11 @@ var CCITTFaxStream = (function ccittFaxStream() {
return p[1]; return p[1];
} }
} else { } else {
var result = findTableCode(1, 9, whiteTable2, ccittEOL); var result = findTableCode(1, 9, whiteTable2);
if (result[0]) if (result[0])
return result[1]; return result[1];
result = findTableCode(11, 12, whiteTable1, ccittEOL); result = findTableCode(11, 12, whiteTable1);
if (result[0]) if (result[0])
return result[1]; return result[1];
} }
@ -2090,7 +2090,7 @@ var CCITTFaxStream = (function ccittFaxStream() {
return p[1]; return p[1];
} }
} else { } else {
var result = findTableCode(2, 6, blackTable3, ccittEOL); var result = findTableCode(2, 6, blackTable3);
if (result[0]) if (result[0])
return result[1]; return result[1];
@ -2098,7 +2098,7 @@ var CCITTFaxStream = (function ccittFaxStream() {
if (result[0]) if (result[0])
return result[1]; return result[1];
result = findTableCode(10, 13, blackTable1, ccittEOL); result = findTableCode(10, 13, blackTable1);
if (result[0]) if (result[0])
return result[1]; return result[1];
} }