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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