llstreamtools.cpp
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上传日期:2021-03-01
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- /**
- * @file llstreamtools.cpp
- * @brief some helper functions for parsing legacy simstate and asset files.
- *
- * $LicenseInfo:firstyear=2005&license=viewergpl$
- *
- * Copyright (c) 2005-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #include "linden_common.h"
- #include <iostream>
- #include <string>
- #include "llstreamtools.h"
- // ----------------------------------------------------------------------------
- // some std::istream helper functions
- // ----------------------------------------------------------------------------
- // skips spaces and tabs
- bool skip_whitespace(std::istream& input_stream)
- {
- int c = input_stream.peek();
- while (('t' == c || ' ' == c) && input_stream.good())
- {
- input_stream.get();
- c = input_stream.peek();
- }
- return input_stream.good();
- }
- // skips whitespace, newlines, and carriage returns
- bool skip_emptyspace(std::istream& input_stream)
- {
- int c = input_stream.peek();
- while ( input_stream.good()
- && ('t' == c || ' ' == c || 'n' == c || 'r' == c) )
- {
- input_stream.get();
- c = input_stream.peek();
- }
- return input_stream.good();
- }
- // skips emptyspace and lines that start with a #
- bool skip_comments_and_emptyspace(std::istream& input_stream)
- {
- while (skip_emptyspace(input_stream))
- {
- int c = input_stream.peek();
- if ('#' == c )
- {
- while ('n' != c && input_stream.good())
- {
- c = input_stream.get();
- }
- }
- else
- {
- break;
- }
- }
- return input_stream.good();
- }
- bool skip_line(std::istream& input_stream)
- {
- int c;
- do
- {
- c = input_stream.get();
- } while ('n' != c && input_stream.good());
- return input_stream.good();
- }
- bool skip_to_next_word(std::istream& input_stream)
- {
- int c = input_stream.peek();
- while ( input_stream.good()
- && ( (c >= 'a' && c <= 'z')
- || (c >= 'A' && c <= 'Z')
- || (c >= '0' && c <= '9')
- || '_' == c ) )
- {
- input_stream.get();
- c = input_stream.peek();
- }
- while ( input_stream.good()
- && !( (c >= 'a' && c <= 'z')
- || (c >= 'A' && c <= 'Z')
- || (c >= '0' && c <= '9')
- || '_' == c ) )
- {
- input_stream.get();
- c = input_stream.peek();
- }
- return input_stream.good();
- }
- bool skip_to_end_of_next_keyword(const char* keyword, std::istream& input_stream)
- {
- int key_length = strlen(keyword); /*Flawfinder: ignore*/
- if (0 == key_length)
- {
- return false;
- }
- while (input_stream.good())
- {
- skip_emptyspace(input_stream);
- int c = input_stream.get();
- if (keyword[0] != c)
- {
- skip_line(input_stream);
- }
- else
- {
- int key_index = 1;
- while ( key_index < key_length
- && keyword[key_index - 1] == c
- && input_stream.good())
- {
- key_index++;
- c = input_stream.get();
- }
- if (key_index == key_length
- && keyword[key_index-1] == c)
- {
- c = input_stream.peek();
- if (' ' == c || 't' == c || 'r' == c || 'n' == c)
- {
- return true;
- }
- else
- {
- skip_line(input_stream);
- }
- }
- else
- {
- skip_line(input_stream);
- }
- }
- }
- return false;
- }
- /* skip_to_start_of_next_keyword() is disabled -- might tickle corruption bug in windows iostream
- bool skip_to_start_of_next_keyword(const char* keyword, std::istream& input_stream)
- {
- int key_length = strlen(keyword);
- if (0 == key_length)
- {
- return false;
- }
- while (input_stream.good())
- {
- skip_emptyspace(input_stream);
- int c = input_stream.get();
- if (keyword[0] != c)
- {
- skip_line(input_stream);
- }
- else
- {
- int key_index = 1;
- while ( key_index < key_length
- && keyword[key_index - 1] == c
- && input_stream.good())
- {
- key_index++;
- c = input_stream.get();
- }
- if (key_index == key_length
- && keyword[key_index-1] == c)
- {
- c = input_stream.peek();
- if (' ' == c || 't' == c || 'r' == c || 'n' == c)
- {
- // put the keyword back onto the stream
- for (int index = key_length - 1; index >= 0; index--)
- {
- input_stream.putback(keyword[index]);
- }
- return true;
- }
- else
- {
- skip_line(input_stream);
- break;
- }
- }
- else
- {
- skip_line(input_stream);
- }
- }
- }
- return false;
- }
- */
- bool get_word(std::string& output_string, std::istream& input_stream)
- {
- skip_emptyspace(input_stream);
- int c = input_stream.peek();
- while ( !isspace(c)
- && 'n' != c
- && 'r' != c
- && input_stream.good() )
- {
- output_string += c;
- input_stream.get();
- c = input_stream.peek();
- }
- return input_stream.good();
- }
- bool get_word(std::string& output_string, std::istream& input_stream, int n)
- {
- skip_emptyspace(input_stream);
- int char_count = 0;
- int c = input_stream.peek();
- while (!isspace(c)
- && 'n' != c
- && 'r' != c
- && input_stream.good()
- && char_count < n)
- {
- char_count++;
- output_string += c;
- input_stream.get();
- c = input_stream.peek();
- }
- return input_stream.good();
- }
- // get everything up to and including the next newline
- bool get_line(std::string& output_string, std::istream& input_stream)
- {
- output_string.clear();
- int c = input_stream.get();
- while (input_stream.good())
- {
- output_string += c;
- if ('n' == c)
- {
- break;
- }
- c = input_stream.get();
- }
- return input_stream.good();
- }
- // get everything up to and including the next newline
- // up to the next n characters.
- // add a newline on the end if bail before actual line ending
- bool get_line(std::string& output_string, std::istream& input_stream, int n)
- {
- output_string.clear();
- int char_count = 0;
- int c = input_stream.get();
- while (input_stream.good() && char_count < n)
- {
- char_count++;
- output_string += c;
- if ('n' == c)
- {
- break;
- }
- if (char_count >= n)
- {
- output_string.append("n");
- break;
- }
- c = input_stream.get();
- }
- return input_stream.good();
- }
- /* disabled -- might tickle bug in windows iostream
- // backs up the input_stream by line_size + 1 characters
- bool unget_line(const std::string& line, std::istream& input_stream)
- {
- input_stream.putback('n'); // unget the newline
- for (int line_index = line.size()-1; line_index >= 0; line_index--)
- {
- input_stream.putback(line[line_index]);
- }
- return input_stream.good();
- }
- */
- // removes the last char in 'line' if it matches 'c'
- // returns true if removed last char
- bool remove_last_char(char c, std::string& line)
- {
- int line_size = line.size();
- if (line_size > 1
- && c == line[line_size - 1])
- {
- line.replace(line_size - 1, 1, "");
- return true;
- }
- return false;
- }
- // replaces escaped characters with the correct characters from left to right
- // "\\" ---> '\' (two backslahes become one)
- // "\n" ---> 'n' (backslash n becomes carriage return)
- void unescape_string(std::string& line)
- {
- int line_size = line.size();
- int index = 0;
- while (index < line_size - 1)
- {
- if ('\' == line[index])
- {
- if ('\' == line[index + 1])
- {
- line.replace(index, 2, "\");
- line_size--;
- }
- else if ('n' == line[index + 1])
- {
- line.replace(index, 2, "n");
- line_size--;
- }
- }
- index++;
- }
- }
- // replaces unescaped characters with expanded equivalents from left to right
- // '\' ---> "\\" (one backslash becomes two)
- // 'n' ---> "\n" (carriage return becomes backslash n)
- void escape_string(std::string& line)
- {
- int line_size = line.size();
- int index = 0;
- while (index < line_size)
- {
- if ('\' == line[index])
- {
- line.replace(index, 1, "\\");
- line_size++;
- index++;
- }
- else if ('n' == line[index])
- {
- line.replace(index, 1, "\n");
- line_size++;
- index++;
- }
- index++;
- }
- }
- // removes 'n' characters
- void replace_newlines_with_whitespace(std::string& line)
- {
- int line_size = line.size();
- int index = 0;
- while (index < line_size)
- {
- if ('n' == line[index])
- {
- line.replace(index, 1, " ");
- }
- index++;
- }
- }
- // erases any double-quote characters in 'line'
- void remove_double_quotes(std::string& line)
- {
- int index = 0;
- int line_size = line.size();
- while (index < line_size)
- {
- if ('"' == line[index])
- {
- int count = 1;
- while (index + count < line_size
- && '"' == line[index + count])
- {
- count++;
- }
- line.replace(index, count, "");
- line_size -= count;
- }
- else
- {
- index++;
- }
- }
- }
- // the 'keyword' is defined as the first word on a line
- // the 'value' is everything after the keyword on the same line
- // starting at the first non-whitespace and ending right before the newline
- void get_keyword_and_value(std::string& keyword,
- std::string& value,
- const std::string& line)
- {
- // skip initial whitespace
- int line_size = line.size();
- int line_index = 0;
- char c;
- while (line_index < line_size)
- {
- c = line[line_index];
- if (!LLStringOps::isSpace(c))
- {
- break;
- }
- line_index++;
- }
- // get the keyword
- keyword.clear();
- while (line_index < line_size)
- {
- c = line[line_index];
- if (LLStringOps::isSpace(c) || 'r' == c || 'n' == c)
- {
- break;
- }
- keyword += c;
- line_index++;
- }
- // get the value
- value.clear();
- if (keyword.size() > 0
- && 'r' != line[line_index]
- && 'n' != line[line_index])
- {
- // discard initial white spaces
- while (line_index < line_size
- && (' ' == line[line_index]
- || 't' == line[line_index]) )
- {
- line_index++;
- }
- while (line_index < line_size)
- {
- c = line[line_index];
- if ('r' == c || 'n' == c)
- {
- break;
- }
- value += c;
- line_index++;
- }
- }
- }
- std::streamsize fullread(
- std::istream& istr,
- char* buf,
- std::streamsize requested)
- {
- std::streamsize got;
- std::streamsize total = 0;
- istr.read(buf, requested); /*Flawfinder: ignore*/
- got = istr.gcount();
- total += got;
- while(got && total < requested)
- {
- if(istr.fail())
- {
- // If bad is true, not much we can doo -- it implies loss
- // of stream integrity. Bail in that case, and otherwise
- // clear and attempt to continue.
- if(istr.bad()) return total;
- istr.clear();
- }
- istr.read(buf + total, requested - total); /*Flawfinder: ignore*/
- got = istr.gcount();
- total += got;
- }
- return total;
- }
- std::istream& operator>>(std::istream& str, const char *tocheck)
- {
- char c = ' ';
- const char *p;
- p = tocheck;
- while (*p && !str.bad())
- {
- str.get(c);
- if (c != *p)
- {
- str.setstate(std::ios::failbit); /*Flawfinder: ignore*/
- break;
- }
- p++;
- }
- return str;
- }