mirror of https://github.com/qpdf/qpdf.git
109 lines
1.8 KiB
C++
109 lines
1.8 KiB
C++
#include <qpdf/Pl_ASCIIHexDecoder.hh>
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#include <qpdf/QEXC.hh>
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#include <qpdf/QTC.hh>
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#include <string.h>
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#include <ctype.h>
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Pl_ASCIIHexDecoder::Pl_ASCIIHexDecoder(char const* identifier, Pipeline* next) :
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Pipeline(identifier, next),
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pos(0),
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eod(false)
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{
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strcpy(this->inbuf, "00");
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}
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Pl_ASCIIHexDecoder::~Pl_ASCIIHexDecoder()
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{
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}
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void
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Pl_ASCIIHexDecoder::write(unsigned char* buf, int len)
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{
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if (this->eod)
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{
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return;
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}
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for (int i = 0; i < len; ++i)
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{
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char ch = toupper(buf[i]);
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switch (ch)
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{
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case ' ':
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case '\f':
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case '\v':
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case '\t':
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case '\r':
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case '\n':
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QTC::TC("libtests", "Pl_ASCIIHexDecoder ignore space");
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// ignore whitespace
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break;
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case '>':
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this->eod = true;
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flush();
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break;
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default:
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if (((ch >= '0') && (ch <= '9')) ||
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((ch >= 'A') && (ch <= 'F')))
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{
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this->inbuf[this->pos++] = ch;
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if (this->pos == 2)
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{
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flush();
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}
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}
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else
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{
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char t[2];
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t[0] = ch;
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t[1] = 0;
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throw QEXC::General(
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std::string("character out of range during base Hex decode: ") + t);
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}
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break;
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}
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if (this->eod)
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{
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break;
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}
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}
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}
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void
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Pl_ASCIIHexDecoder::flush()
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{
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if (this->pos == 0)
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{
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QTC::TC("libtests", "Pl_ASCIIHexDecoder no-op flush");
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return;
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}
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int b[2];
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for (int i = 0; i < 2; ++i)
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{
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if (this->inbuf[i] >= 'A')
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{
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b[i] = this->inbuf[i] - 'A' + 10;
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}
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else
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{
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b[i] = this->inbuf[i] - '0';
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}
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}
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unsigned char ch = (unsigned char)((b[0] << 4) + b[1]);
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QTC::TC("libtests", "Pl_ASCIIHexDecoder partial flush",
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(this->pos == 2) ? 0 : 1);
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getNext()->write(&ch, 1);
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this->pos = 0;
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strcpy(this->inbuf, "00");
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}
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void
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Pl_ASCIIHexDecoder::finish()
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{
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flush();
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getNext()->finish();
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}
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