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4188f38a | 1 | <?php |
2 | // | |
3 | // FPDI - Version 1.2 | |
4 | // | |
5 | // Copyright 2004-2007 Setasign - Jan Slabon | |
6 | // | |
7 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
8 | // you may not use this file except in compliance with the License. | |
9 | // You may obtain a copy of the License at | |
10 | // | |
11 | // http://www.apache.org/licenses/LICENSE-2.0 | |
12 | // | |
13 | // Unless required by applicable law or agreed to in writing, software | |
14 | // distributed under the License is distributed on an "AS IS" BASIS, | |
15 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
16 | // See the License for the specific language governing permissions and | |
17 | // limitations under the License. | |
18 | // | |
19 | ||
20 | class pdf_context { | |
21 | ||
22 | var $file; | |
23 | var $buffer; | |
24 | var $offset; | |
25 | var $length; | |
26 | ||
27 | var $stack; | |
28 | ||
29 | // Constructor | |
30 | ||
31 | function pdf_context($f) { | |
32 | $this->file = $f; | |
33 | $this->reset(); | |
34 | } | |
35 | ||
36 | // Optionally move the file | |
37 | // pointer to a new location | |
38 | // and reset the buffered data | |
39 | ||
40 | function reset($pos = null, $l = 100) { | |
41 | if (!is_null ($pos)) { | |
42 | fseek ($this->file, $pos); | |
43 | } | |
44 | ||
45 | $this->buffer = $l > 0 ? fread($this->file, $l) : ''; | |
46 | $this->offset = 0; | |
47 | $this->length = strlen($this->buffer); | |
48 | $this->stack = array(); | |
49 | } | |
50 | ||
51 | // Make sure that there is at least one | |
52 | // character beyond the current offset in | |
53 | // the buffer to prevent the tokenizer | |
54 | // from attempting to access data that does | |
55 | // not exist | |
56 | ||
57 | function ensure_content() { | |
58 | if ($this->offset >= $this->length - 1) { | |
59 | return $this->increase_length(); | |
60 | } else { | |
61 | return true; | |
62 | } | |
63 | } | |
64 | ||
65 | // Forcefully read more data into the buffer | |
66 | ||
67 | function increase_length($l=100) { | |
68 | if (feof($this->file)) { | |
69 | return false; | |
70 | } else { | |
71 | $this->buffer .= fread($this->file, $l); | |
72 | $this->length = strlen($this->buffer); | |
73 | return true; | |
74 | } | |
75 | } | |
76 | ||
77 | } | |
78 | ?> |