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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2011 New Dream Network
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "common/escape.h"
#include <stdio.h>
#include <string.h>
#include <iomanip>
#include <boost/optional.hpp>
/*
* Some functions for escaping RGW responses
*/
/* Static string length */
#define SSTRL(x) ((sizeof(x)/sizeof(x[0])) - 1)
#define LESS_THAN_XESCAPE "<"
#define AMPERSAND_XESCAPE "&"
#define GREATER_THAN_XESCAPE ">"
#define SGL_QUOTE_XESCAPE "'"
#define DBL_QUOTE_XESCAPE """
size_t escape_xml_attr_len(const char *buf)
{
const char *b;
size_t ret = 0;
for (b = buf; *b; ++b) {
unsigned char c = *b;
switch (c) {
case '<':
ret += SSTRL(LESS_THAN_XESCAPE);
break;
case '&':
ret += SSTRL(AMPERSAND_XESCAPE);
break;
case '>':
ret += SSTRL(GREATER_THAN_XESCAPE);
break;
case '\'':
ret += SSTRL(SGL_QUOTE_XESCAPE);
break;
case '"':
ret += SSTRL(DBL_QUOTE_XESCAPE);
break;
default:
// Escape control characters.
if (((c < 0x20) && (c != 0x09) && (c != 0x0a)) ||
(c == 0x7f)) {
ret += 6;
}
else {
ret++;
}
}
}
// leave room for null terminator
ret++;
return ret;
}
void escape_xml_attr(const char *buf, char *out)
{
char *o = out;
const char *b;
for (b = buf; *b; ++b) {
unsigned char c = *b;
switch (c) {
case '<':
memcpy(o, LESS_THAN_XESCAPE, SSTRL(LESS_THAN_XESCAPE));
o += SSTRL(LESS_THAN_XESCAPE);
break;
case '&':
memcpy(o, AMPERSAND_XESCAPE, SSTRL(AMPERSAND_XESCAPE));
o += SSTRL(AMPERSAND_XESCAPE);
break;
case '>':
memcpy(o, GREATER_THAN_XESCAPE, SSTRL(GREATER_THAN_XESCAPE));
o += SSTRL(GREATER_THAN_XESCAPE);
break;
case '\'':
memcpy(o, SGL_QUOTE_XESCAPE, SSTRL(SGL_QUOTE_XESCAPE));
o += SSTRL(SGL_QUOTE_XESCAPE);
break;
case '"':
memcpy(o, DBL_QUOTE_XESCAPE, SSTRL(DBL_QUOTE_XESCAPE));
o += SSTRL(DBL_QUOTE_XESCAPE);
break;
default:
// Escape control characters.
if (((c < 0x20) && (c != 0x09) && (c != 0x0a)) ||
(c == 0x7f)) {
snprintf(o, 7, "&#x%02x;", c);
o += 6;
}
else {
*o++ = c;
}
break;
}
}
// null terminator
*o = '\0';
}
// applies hex formatting on construction, restores on destruction
struct hex_formatter {
std::ostream& out;
const char old_fill;
const std::ostream::fmtflags old_flags;
explicit hex_formatter(std::ostream& out)
: out(out),
old_fill(out.fill('0')),
old_flags(out.setf(out.hex, out.basefield))
{}
~hex_formatter() {
out.fill(old_fill);
out.flags(old_flags);
}
};
std::ostream& operator<<(std::ostream& out, const xml_stream_escaper& e)
{
boost::optional<hex_formatter> fmt;
for (unsigned char c : e.str) {
switch (c) {
case '<':
out << LESS_THAN_XESCAPE;
break;
case '&':
out << AMPERSAND_XESCAPE;
break;
case '>':
out << GREATER_THAN_XESCAPE;
break;
case '\'':
out << SGL_QUOTE_XESCAPE;
break;
case '"':
out << DBL_QUOTE_XESCAPE;
break;
default:
// Escape control characters.
if (((c < 0x20) && (c != 0x09) && (c != 0x0a)) || (c == 0x7f)) {
if (!fmt) {
fmt.emplace(out); // enable hex formatting
}
out << "&#x" << std::setw(2) << static_cast<unsigned int>(c) << ';';
} else {
out << c;
}
break;
}
}
return out;
}
#define DBL_QUOTE_JESCAPE "\\\""
#define BACKSLASH_JESCAPE "\\\\"
#define TAB_JESCAPE "\\t"
#define NEWLINE_JESCAPE "\\n"
size_t escape_json_attr_len(const char *buf, size_t src_len)
{
const char *b;
size_t i, ret = 0;
for (i = 0, b = buf; i < src_len; ++i, ++b) {
unsigned char c = *b;
switch (c) {
case '"':
ret += SSTRL(DBL_QUOTE_JESCAPE);
break;
case '\\':
ret += SSTRL(BACKSLASH_JESCAPE);
break;
case '\t':
ret += SSTRL(TAB_JESCAPE);
break;
case '\n':
ret += SSTRL(NEWLINE_JESCAPE);
break;
default:
// Escape control characters.
if ((c < 0x20) || (c == 0x7f)) {
ret += 6;
}
else {
ret++;
}
}
}
// leave room for null terminator
ret++;
return ret;
}
void escape_json_attr(const char *buf, size_t src_len, char *out)
{
char *o = out;
const char *b;
size_t i;
for (i = 0, b = buf; i < src_len; ++i, ++b) {
unsigned char c = *b;
switch (c) {
case '"':
// cppcheck-suppress invalidFunctionArg
memcpy(o, DBL_QUOTE_JESCAPE, SSTRL(DBL_QUOTE_JESCAPE));
o += SSTRL(DBL_QUOTE_JESCAPE);
break;
case '\\':
// cppcheck-suppress invalidFunctionArg
memcpy(o, BACKSLASH_JESCAPE, SSTRL(BACKSLASH_JESCAPE));
o += SSTRL(BACKSLASH_JESCAPE);
break;
case '\t':
// cppcheck-suppress invalidFunctionArg
memcpy(o, TAB_JESCAPE, SSTRL(TAB_JESCAPE));
o += SSTRL(TAB_JESCAPE);
break;
case '\n':
// cppcheck-suppress invalidFunctionArg
memcpy(o, NEWLINE_JESCAPE, SSTRL(NEWLINE_JESCAPE));
o += SSTRL(NEWLINE_JESCAPE);
break;
default:
// Escape control characters.
if ((c < 0x20) || (c == 0x7f)) {
snprintf(o, 7, "\\u%04x", c);
o += 6;
}
else {
*o++ = c;
}
break;
}
}
// null terminator
*o = '\0';
}
std::ostream& operator<<(std::ostream& out, const json_stream_escaper& e)
{
boost::optional<hex_formatter> fmt;
for (unsigned char c : e.str) {
switch (c) {
case '"':
out << DBL_QUOTE_JESCAPE;
break;
case '\\':
out << BACKSLASH_JESCAPE;
break;
case '\t':
out << TAB_JESCAPE;
break;
case '\n':
out << NEWLINE_JESCAPE;
break;
default:
// Escape control characters.
if ((c < 0x20) || (c == 0x7f)) {
if (!fmt) {
fmt.emplace(out); // enable hex formatting
}
out << "\\u" << std::setw(4) << static_cast<unsigned int>(c);
} else {
out << c;
}
break;
}
}
return out;
}
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