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Laz-perf is a relatively "underground" library, and is not packaged for many major distributions. Its also tiny and trivial to include with the other external libraries. This avoids requiring users who want point cloud support to have to compile their own laz-perf
115 lines
2.4 KiB
C++
115 lines
2.4 KiB
C++
/*
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===============================================================================
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FILE: streams.hpp
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CONTENTS:
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Stream abstractions
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PROGRAMMERS:
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uday.karan@gmail.com - Hobu, Inc.
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COPYRIGHT:
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(c) 2014, Uday Verma, Hobu, Inc.
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This is free software; you can redistribute and/or modify it under the
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terms of the GNU Lesser General Licence as published by the Free Software
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Foundation. See the COPYING file for more information.
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This software is distributed WITHOUT ANY WARRANTY and without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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CHANGE HISTORY:
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===============================================================================
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*/
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#ifndef __streams_hpp__
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#define __streams_hpp__
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#include <algorithm>
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namespace laszip {
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namespace streams {
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struct memory_stream {
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memory_stream(const char *buf, std::streamsize len) :
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buf_(buf), len_(len), offset_(0),
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is_bad_(false), is_eof_(false), last_read_count_(0) {
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}
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void read(char *into, std::streamsize size) {
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if (is_eof_) {
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is_bad_ = true;
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return;
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}
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std::streamsize to_read = (std::min)(size, len_ - offset_);
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std::copy(buf_ + offset_, buf_ + offset_ + to_read, into);
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offset_ += to_read;
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last_read_count_ = to_read;
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if (offset_ >= len_)
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is_eof_ = true;
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}
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bool eof() {
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return is_eof_;
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}
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std::streamsize gcount() {
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return last_read_count_;
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}
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bool good() {
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bool b = is_bad_;
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is_bad_ = false;
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return !b;
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}
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void clear() {
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is_bad_ = false;
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is_eof_ = false;
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}
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std::streamsize tellg() {
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return offset_;
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}
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void seekg(std::ios::pos_type p) {
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if (p >= len_)
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is_bad_ = true;
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else
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offset_ = p;
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}
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void seekg(std::ios::off_type p, std::ios_base::seekdir dir) {
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std::streamoff new_offset_ = 0;
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switch(dir) {
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case std::ios::beg: new_offset_ = p; break;
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case std::ios::end: new_offset_ = len_ + p - 1; break;
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case std::ios::cur: new_offset_ = offset_ + p; break;
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default: break;
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}
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if (new_offset_ >= len_ || new_offset_ < 0)
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is_bad_ = true;
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else {
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is_bad_ = false;
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offset_ = new_offset_;
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}
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}
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const char *buf_;
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std::streamsize len_, offset_;
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bool is_bad_, is_eof_;
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std::streamsize last_read_count_;
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};
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}
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}
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#endif // __streams_hpp__
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