mirror of https://github.com/qpdf/qpdf.git
143 lines
3.5 KiB
C++
143 lines
3.5 KiB
C++
#include <qpdf/FileInputSource.hh>
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#include <qpdf/QPDFExc.hh>
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#include <qpdf/QUtil.hh>
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#include <algorithm>
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#include <cstring>
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FileInputSource::FileInputSource() :
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close_file(false),
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file(nullptr)
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{
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}
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FileInputSource::FileInputSource(char const* filename) :
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close_file(true),
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filename(filename),
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file(QUtil::safe_fopen(filename, "rb"))
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{
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}
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FileInputSource::FileInputSource(char const* description, FILE* filep, bool close_file) :
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close_file(close_file),
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filename(description),
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file(filep)
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{
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}
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FileInputSource::~FileInputSource()
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{
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// Must be explicit and not inline -- see QPDF_DLL_CLASS in README-maintainer
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if (this->file && this->close_file) {
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fclose(this->file);
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}
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}
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void
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FileInputSource::setFilename(char const* filename)
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{
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this->close_file = true;
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this->filename = filename;
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this->file = QUtil::safe_fopen(filename, "rb");
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}
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void
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FileInputSource::setFile(char const* description, FILE* filep, bool close_file)
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{
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this->filename = description;
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this->file = filep;
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this->seek(0, SEEK_SET);
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}
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qpdf_offset_t
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FileInputSource::findAndSkipNextEOL()
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{
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qpdf_offset_t result = 0;
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bool done = false;
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char buf[10240];
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while (!done) {
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qpdf_offset_t cur_offset = QUtil::tell(this->file);
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size_t len = this->read(buf, sizeof(buf));
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if (len == 0) {
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done = true;
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result = this->tell();
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} else {
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char* p1 = static_cast<char*>(memchr(buf, '\r', len));
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char* p2 = static_cast<char*>(memchr(buf, '\n', len));
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char* p = (p1 && p2) ? std::min(p1, p2) : p1 ? p1 : p2;
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if (p) {
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result = cur_offset + (p - buf);
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// We found \r or \n. Keep reading until we get past \r and \n characters.
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this->seek(result + 1, SEEK_SET);
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char ch;
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while (!done) {
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if (this->read(&ch, 1) == 0) {
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done = true;
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} else if (!((ch == '\r') || (ch == '\n'))) {
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this->unreadCh(ch);
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done = true;
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}
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}
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}
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}
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}
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return result;
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}
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std::string const&
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FileInputSource::getName() const
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{
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return this->filename;
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}
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qpdf_offset_t
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FileInputSource::tell()
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{
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return QUtil::tell(this->file);
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}
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void
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FileInputSource::seek(qpdf_offset_t offset, int whence)
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{
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if (QUtil::seek(this->file, offset, whence) == -1) {
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QUtil::throw_system_error(
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std::string("seek to ") + this->filename + ", offset " + std::to_string(offset) + " (" +
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std::to_string(whence) + ")");
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}
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}
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void
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FileInputSource::rewind()
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{
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::rewind(this->file);
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}
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size_t
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FileInputSource::read(char* buffer, size_t length)
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{
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this->last_offset = QUtil::tell(this->file);
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size_t len = fread(buffer, 1, length, this->file);
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if (len == 0) {
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if (ferror(this->file)) {
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throw QPDFExc(
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qpdf_e_system,
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this->filename,
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"",
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this->last_offset,
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(std::string("read ") + std::to_string(length) + " bytes"));
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} else if (length > 0) {
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this->seek(0, SEEK_END);
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this->last_offset = this->tell();
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}
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}
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return len;
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}
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void
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FileInputSource::unreadCh(char ch)
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{
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if (ungetc(static_cast<unsigned char>(ch), this->file) == -1) {
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QUtil::throw_system_error(this->filename + ": unread character");
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}
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}
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