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