Sakurai/pdf.js
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made Ascii85Stream be a child of DecodeStream

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sbarman 2011-06-21 22:39:38 -07:00
parent 61b482c1fa
commit 42f8b52639
1 changed files with 68 additions and 128 deletions
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196
pdf.js
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@ -171,15 +171,22 @@ var DecodeStream = (function() {
getBytes: function(length) { getBytes: function(length) {
var pos = this.pos; var pos = this.pos;
this.ensureBuffer(pos + length); if (length) {
while (!this.eof && this.bufferLength < pos + length) this.ensureBuffer(pos + length);
this.readBlock(); var end = pos + length;
var end = pos + length; while (!this.eof && this.bufferLength < end)
var bufEnd = this.bufferLength; this.readBlock();
if (end > bufEnd) var bufEnd = this.bufferLength;
end = bufEnd; if (end > bufEnd)
end = bufEnd;
} else {
while (!this.eof)
this.readBlock();
var end = this.bufferLength;
}
this.pos = end; this.pos = end;
return this.buffer.subarray(pos, end) return this.buffer.subarray(pos, end)
@ -763,132 +770,64 @@ var Ascii85Stream = (function() {
function constructor(str) { function constructor(str) {
this.str = str; this.str = str;
this.dict = str.dict; this.dict = str.dict;
this.eof = false;
this.pos = 0; DecodeStream.call(this);
this.bufferLength = 0;
this.buffer = null;
} }
constructor.prototype = {
ensureBuffer: function(requested) { constructor.prototype = Object.create(DecodeStream.prototype);
constructor.prototype.readBlock = function() {
const tildaCode = "~".charCodeAt(0);
const zCode = "z".charCodeAt(0);
var str = this.str;
var c = str.getByte();
while (Lexer.isSpace(String.fromCharCode(c)))
c = str.getByte();
if (!c || c === tildaCode) {
this.eof = true;
return;
}
var bufferLength = this.bufferLength;
// special code for z
if (c == zCode) {
this.ensureBuffer(bufferLength + 4);
var buffer = this.buffer; var buffer = this.buffer;
var current = buffer ? buffer.byteLength : 0; for (var i = 0; i < 4; ++i)
if (requested < current) buffer[bufferLength + i] = 0;
return buffer; this.bufferLength += 4;
var size = 512; } else {
while (size < requested) var input = new Uint8Array(5);
size <<= 1; input[0] = c;
var buffer2 = Uint8Array(size); for (var i = 1; i < 5; ++i){
for (var i = 0; i < current; ++i)
buffer2[i] = buffer[i];
return this.buffer = buffer2;
},
getByte: function() {
var pos = this.pos;
while (this.bufferLength <= pos) {
if (this.eof)
return;
this.readBlock();
}
return this.buffer[this.pos++];
},
getBytes: function(length) {
var pos = this.pos;
this.ensureBuffer(pos + length);
if (length) {
while (!this.eof && this.bufferLength < pos + length)
this.readBlock();
var end = pos + length;
var bufEnd = this.bufferLength;
if (end > bufEnd)
end = bufEnd;
} else {
while(!this.eof)
this.readBlock();
var end = this.bufferLength;
}
this.pos = end;
return this.buffer.subarray(pos, end)
},
lookChar: function() {
var pos = this.pos;
while (this.bufferLength <= pos) {
if (this.eof)
return;
this.readBlock();
}
return String.fromCharCode(this.buffer[this.pos]);
},
getChar: function() {
var pos = this.pos;
while (this.bufferLength <= pos) {
if (this.eof)
return;
this.readBlock();
}
return String.fromCharCode(this.buffer[this.pos++]);
},
skip: function(n) {
if (!n)
n = 1;
this.pos += n;
},
readBlock: function() {
const tildaCode = "~".charCodeAt(0);
const zCode = "z".charCodeAt(0);
var str = this.str;
var c = str.getByte();
while (Lexer.isSpace(String.fromCharCode(c)))
c = str.getByte(); c = str.getByte();
if (!c || c === tildaCode) { while (Lexer.isSpace(String.fromCharCode(c)))
this.eof = true;
return;
}
var bufferLength = this.bufferLength;
// special code for z
if (c == zCode) {
this.ensureBuffer(bufferLength + 4);
var buffer = this.buffer;
buffer[bufferLength++] = 0;
buffer[bufferLength++] = 0;
buffer[bufferLength++] = 0;
buffer[bufferLength++] = 0;
this.bufferLength += 4;
} else {
var input = new Uint8Array(5);
input[0] = c;
for (var i = 1; i < 5; ++i){
c = str.getByte(); c = str.getByte();
while (Lexer.isSpace(String.fromCharCode(c)))
c = str.getByte();
input[i] = c; input[i] = c;
if (!c || c == tildaCode) if (!c || c == tildaCode)
break; break;
} }
this.ensureBuffer(bufferLength + i - 1); this.ensureBuffer(bufferLength + i - 1);
var buffer = this.buffer; var buffer = this.buffer;
this.bufferLength += i - 1; this.bufferLength += i - 1;
// partial ending;
if (i < 5) { // partial ending;
for (++i; i < 5; ++i) if (i < 5) {
input[i] = 0x21 + 84; for (; i < 5; ++i)
this.eof = true; input[i] = 0x21 + 84;
} this.eof = true;
var t = 0; }
for (var i = 0; i < 5; ++i) var t = 0;
t = t * 85 + (input[i] - 0x21); for (var i = 0; i < 5; ++i)
t = t * 85 + (input[i] - 0x21);
for (var i = 3; i >= 0; --i){
buffer[bufferLength + i] = t & 0xFF; for (var i = 3; i >= 0; --i){
t >>= 8; buffer[bufferLength + i] = t & 0xFF;
} t >>= 8;
} }
} }
}; };
@ -2402,6 +2341,7 @@ var CanvasGraphics = (function() {
constructor.prototype = { constructor.prototype = {
translateFont: function(fontDict, xref, resources) { translateFont: function(fontDict, xref, resources) {
return;
var descriptor = xref.fetch(fontDict.get("FontDescriptor")); var descriptor = xref.fetch(fontDict.get("FontDescriptor"));
var fontName = descriptor.get("FontName"); var fontName = descriptor.get("FontName");