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11551 | jghali | 1 | /* |
2 | For general Scribus (>=1.3.2) copyright and licensing information please refer |
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3 | to the COPYING file provided with the program. Following this notice may exist |
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4 | a copyright and/or license notice that predates the release of Scribus 1.3.2 |
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5 | for which a new license (GPL+exception) is in place. |
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6 | */ |
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7 | |||
8 | #include "scstreamfilter_ascii85.h" |
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9 | #include "util.h" |
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10 | |||
11 | ScASCII85EncodeFilter::ScASCII85EncodeFilter(QDataStream* stream) |
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12 | : ScStreamFilter(stream) |
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13 | { |
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14 | } |
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15 | |||
16 | ScASCII85EncodeFilter::ScASCII85EncodeFilter(ScStreamFilter* filter) |
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17 | : ScStreamFilter(filter) |
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18 | { |
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19 | } |
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20 | |||
22521 | craig | 21 | bool ScASCII85EncodeFilter::openFilter () |
11551 | jghali | 22 | { |
23 | m_buffer_pending = 0; |
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24 | m_four_tuple_pending = 0; |
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25 | m_buffer.resize(65536); |
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26 | if (m_buffer.size() <= 0) |
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27 | return false; |
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28 | return ScStreamFilter::openFilter(); |
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29 | } |
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30 | |||
22521 | craig | 31 | bool ScASCII85EncodeFilter::closeFilter() |
11551 | jghali | 32 | { |
33 | bool success = true; |
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34 | if (m_buffer_pending) |
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35 | { |
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36 | char* writeBuffer = m_buffer.data(); |
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37 | writeBuffer[m_buffer_pending] = 0; |
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38 | success &= writeDataInternal((const char*) writeBuffer, m_buffer_pending); |
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39 | } |
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40 | if (m_four_tuple_pending) |
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41 | { |
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42 | quint32 value; |
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43 | const char* ascii85; |
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44 | unsigned char five_tuple[6]; |
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45 | bool allZero; |
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46 | |||
47 | memset (m_four_tuple + m_four_tuple_pending, 0, 4 - m_four_tuple_pending); |
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48 | value = m_four_tuple[0] << 24 | m_four_tuple[1] << 16 | m_four_tuple[2] << 8 | m_four_tuple[3]; |
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49 | ascii85 = toAscii85(value, allZero); |
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50 | memcpy (five_tuple, ascii85, 5); |
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51 | five_tuple[m_four_tuple_pending + 1] = 0; |
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52 | int five_tuple_len = strlen((const char* ) five_tuple); |
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53 | success &= writeDataInternal((const char* ) five_tuple, five_tuple_len); |
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54 | } |
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55 | success &= writeDataInternal("~>\n", 3); |
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56 | success &= ScStreamFilter::closeFilter(); |
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57 | return success; |
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58 | } |
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59 | |||
60 | bool ScASCII85EncodeFilter::writeData(const char* data, int dataLen) |
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61 | { |
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62 | bool writeSuccess = true; |
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63 | int lineLength = 0; |
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64 | bool allZero = true; |
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65 | const char* ascii85; |
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66 | quint32 value; |
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67 | |||
68 | int maxWrite = m_buffer.size() - (m_buffer.size() % 5) - 5; |
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25179 | jghali | 69 | if (maxWrite <= 5) |
70 | return false; |
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11551 | jghali | 71 | |
72 | const unsigned char *ptr = (const unsigned char*) data; |
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73 | unsigned char* writeBuffer = (unsigned char*) m_buffer.data(); |
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74 | unsigned char* ptrw = writeBuffer + m_buffer_pending; |
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75 | |||
76 | while (dataLen) |
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77 | { |
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78 | m_four_tuple[m_four_tuple_pending++] = *ptr++; |
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79 | dataLen--; |
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80 | if (m_four_tuple_pending == 4) |
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81 | { |
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82 | value = m_four_tuple[0] << 24 | m_four_tuple[1] << 16 | m_four_tuple[2] << 8 | m_four_tuple[3]; |
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83 | ascii85 = toAscii85(value, allZero); |
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84 | if (allZero) |
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85 | *ptrw++ = 'z'; |
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86 | else |
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87 | { |
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88 | *ptrw++ = ascii85[0]; |
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89 | *ptrw++ = ascii85[1]; |
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90 | *ptrw++ = ascii85[2]; |
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91 | *ptrw++ = ascii85[3]; |
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92 | *ptrw++ = ascii85[4]; |
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93 | } |
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94 | lineLength += ((allZero) ? 1 : 5); |
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95 | m_buffer_pending += ((allZero) ? 1 : 5); |
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96 | if (lineLength > 75) |
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97 | { |
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98 | *ptrw++ = '\n'; |
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99 | ++m_buffer_pending; |
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100 | lineLength = 0; |
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101 | } |
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102 | if (m_buffer_pending > maxWrite) |
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103 | { |
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104 | writeSuccess &= writeDataInternal((const char*) writeBuffer, m_buffer_pending); |
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105 | ptrw = writeBuffer; |
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106 | m_buffer_pending = 0; |
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107 | } |
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108 | m_four_tuple_pending = 0; |
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109 | } |
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110 | } |
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111 | return writeSuccess; |
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112 | } |