mirror of
https://invent.kde.org/graphics/okular
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110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
// bigEndianByteReader.cpp
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//
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// Part of KDVI - A DVI previewer for the KDE desktop environemt
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//
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// (C) 2003 Stefan Kebekus
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// Distributed under the GPL
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#include <kdebug.h>
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#include "bigEndianByteReader.h"
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#include "dvi.h"
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//#define DEBUG_ENDIANREADER
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Q_UINT8 bigEndianByteReader::readUINT8(void)
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{
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// This check saveguards us against segmentation fault. It is also
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// necessary for virtual fonts, which do not end whith EOP.
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if (command_pointer >= end_pointer) {
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#ifdef DEBUG_ENDIANREADER
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kdError(4300) << "bigEndianByteReader::readUINT8() tried to read past end of data chunk" << endl;
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kdError(4300) << "end_pointer = " << end_pointer << endl;
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kdError(4300) << "command_pointer = " << command_pointer << endl;
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#endif
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return EOP;
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}
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return *(command_pointer++);
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}
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Q_UINT16 bigEndianByteReader::readUINT16(void)
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{
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// This check saveguards us against segmentation fault. It is also
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// necessary for virtual fonts, which do not end whith EOP.
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if (command_pointer >= end_pointer)
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return EOP;
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Q_UINT16 a;
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a = *(command_pointer++);
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a = (a << 8) | *(command_pointer++);
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return a;
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}
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Q_UINT32 bigEndianByteReader::readUINT32(void)
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{
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// This check saveguards us against segmentation fault. It is also
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// necessary for virtual fonts, which do not end whith EOP.
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if (command_pointer >= end_pointer)
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return EOP;
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Q_UINT32 a;
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a = *(command_pointer++);
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a = (a << 8) | *(command_pointer++);
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a = (a << 8) | *(command_pointer++);
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a = (a << 8) | *(command_pointer++);
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return a;
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}
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void bigEndianByteReader::writeUINT32(Q_UINT32 a)
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{
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// This check saveguards us against segmentation fault. It is also
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// necessary for virtual fonts, which do not end whith EOP.
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if (command_pointer >= end_pointer)
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return;
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command_pointer[3] = (Q_UINT8)(a & 0xFF);
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a = a >> 8;
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command_pointer[2] = (Q_UINT8)(a & 0xFF);
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a = a >> 8;
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command_pointer[1] = (Q_UINT8)(a & 0xFF);
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a = a >> 8;
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command_pointer[0] = (Q_UINT8)(a & 0xFF);
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command_pointer += 4;
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return;
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}
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Q_UINT32 bigEndianByteReader::readUINT(Q_UINT8 size)
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{
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// This check saveguards us against segmentation fault. It is also
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// necessary for virtual fonts, which do not end whith EOP.
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if (command_pointer >= end_pointer)
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return EOP;
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Q_UINT32 a = 0;
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while (size > 0) {
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a = (a << 8) + *(command_pointer++);
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size--;
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}
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return a;
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}
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Q_INT32 bigEndianByteReader::readINT(Q_UINT8 length)
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{
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// This check saveguards us against segmentation fault. It is also
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// necessary for virtual fonts, which do not end whith EOP.
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if (command_pointer >= end_pointer)
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return EOP;
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Q_INT32 a = *(command_pointer++);
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if (a & 0x80)
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a -= 0x100;
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while ((--length) > 0)
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a = (a << 8) | *(command_pointer++);
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return a;
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}
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