blob: 81ab6e95ed27e66032c76ef183e1a1ab1b045439 [file] [log] [blame]
/*
* libjingle
* Copyright 2004--2011, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/base/stringencode.h"
#include <cstdio>
#include <cstdlib>
#include "talk/base/basictypes.h"
#include "talk/base/common.h"
#include "talk/base/stringutils.h"
namespace talk_base {
/////////////////////////////////////////////////////////////////////////////
// String Encoding Utilities
/////////////////////////////////////////////////////////////////////////////
static const char HEX[] = "0123456789abcdef";
char hex_encode(unsigned char val) {
ASSERT(val < 16);
return (val < 16) ? HEX[val] : '!';
}
bool hex_decode(char ch, unsigned char* val) {
if ((ch >= '0') && (ch <= '9')) {
*val = ch - '0';
} else if ((ch >= 'A') && (ch <= 'Z')) {
*val = (ch - 'A') + 10;
} else if ((ch >= 'a') && (ch <= 'z')) {
*val = (ch - 'a') + 10;
} else {
return false;
}
return true;
}
size_t escape(char * buffer, size_t buflen,
const char * source, size_t srclen,
const char * illegal, char escape) {
ASSERT(NULL != buffer); // TODO: estimate output size
if (buflen <= 0)
return 0;
size_t srcpos = 0, bufpos = 0;
while ((srcpos < srclen) && (bufpos + 1 < buflen)) {
char ch = source[srcpos++];
if ((ch == escape) || ::strchr(illegal, ch)) {
if (bufpos + 2 >= buflen)
break;
buffer[bufpos++] = escape;
}
buffer[bufpos++] = ch;
}
buffer[bufpos] = '\0';
return bufpos;
}
size_t unescape(char * buffer, size_t buflen,
const char * source, size_t srclen,
char escape) {
ASSERT(NULL != buffer); // TODO: estimate output size
if (buflen <= 0)
return 0;
size_t srcpos = 0, bufpos = 0;
while ((srcpos < srclen) && (bufpos + 1 < buflen)) {
char ch = source[srcpos++];
if ((ch == escape) && (srcpos < srclen)) {
ch = source[srcpos++];
}
buffer[bufpos++] = ch;
}
buffer[bufpos] = '\0';
return bufpos;
}
size_t encode(char * buffer, size_t buflen,
const char * source, size_t srclen,
const char * illegal, char escape) {
ASSERT(NULL != buffer); // TODO: estimate output size
if (buflen <= 0)
return 0;
size_t srcpos = 0, bufpos = 0;
while ((srcpos < srclen) && (bufpos + 1 < buflen)) {
char ch = source[srcpos++];
if ((ch != escape) && !::strchr(illegal, ch)) {
buffer[bufpos++] = ch;
} else if (bufpos + 3 >= buflen) {
break;
} else {
buffer[bufpos+0] = escape;
buffer[bufpos+1] = hex_encode((static_cast<unsigned char>(ch) >> 4) & 0xF);
buffer[bufpos+2] = hex_encode((static_cast<unsigned char>(ch) ) & 0xF);
bufpos += 3;
}
}
buffer[bufpos] = '\0';
return bufpos;
}
size_t decode(char * buffer, size_t buflen,
const char * source, size_t srclen,
char escape) {
if (buflen <= 0)
return 0;
unsigned char h1, h2;
size_t srcpos = 0, bufpos = 0;
while ((srcpos < srclen) && (bufpos + 1 < buflen)) {
char ch = source[srcpos++];
if ((ch == escape)
&& (srcpos + 1 < srclen)
&& hex_decode(source[srcpos], &h1)
&& hex_decode(source[srcpos+1], &h2)) {
buffer[bufpos++] = (h1 << 4) | h2;
srcpos += 2;
} else {
buffer[bufpos++] = ch;
}
}
buffer[bufpos] = '\0';
return bufpos;
}
const char* unsafe_filename_characters() {
// It might be better to have a single specification which is the union of
// all operating systems, unless one system is overly restrictive.
#ifdef WIN32
return "\\/:*?\"<>|";
#else // !WIN32
// TODO
ASSERT(false);
return "";
#endif // !WIN23
}
const unsigned char URL_UNSAFE = 0x1; // 0-33 "#$%&+,/:;<=>?@[\]^`{|} 127
const unsigned char XML_UNSAFE = 0x2; // "&'<>
const unsigned char HTML_UNSAFE = 0x2; // "&'<>
// ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 6 5 7 8 9 : ; < = > ?
//@ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _
//` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~
const unsigned char ASCII_CLASS[128] = {
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,0,3,1,1,1,3,2,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,1,1,3,1,3,1,
1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,
1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,1,
};
size_t url_encode(char * buffer, size_t buflen,
const char * source, size_t srclen) {
if (NULL == buffer)
return srclen * 3 + 1;
if (buflen <= 0)
return 0;
size_t srcpos = 0, bufpos = 0;
while ((srcpos < srclen) && (bufpos + 1 < buflen)) {
unsigned char ch = source[srcpos++];
if ((ch < 128) && (ASCII_CLASS[ch] & URL_UNSAFE)) {
if (bufpos + 3 >= buflen) {
break;
}
buffer[bufpos+0] = '%';
buffer[bufpos+1] = hex_encode((ch >> 4) & 0xF);
buffer[bufpos+2] = hex_encode((ch ) & 0xF);
bufpos += 3;
} else {
buffer[bufpos++] = ch;
}
}
buffer[bufpos] = '\0';
return bufpos;
}
size_t url_decode(char * buffer, size_t buflen,
const char * source, size_t srclen) {
if (NULL == buffer)
return srclen + 1;
if (buflen <= 0)
return 0;
unsigned char h1, h2;
size_t srcpos = 0, bufpos = 0;
while ((srcpos < srclen) && (bufpos + 1 < buflen)) {
unsigned char ch = source[srcpos++];
if (ch == '+') {
buffer[bufpos++] = ' ';
} else if ((ch == '%')
&& (srcpos + 1 < srclen)
&& hex_decode(source[srcpos], &h1)
&& hex_decode(source[srcpos+1], &h2))
{
buffer[bufpos++] = (h1 << 4) | h2;
srcpos += 2;
} else {
buffer[bufpos++] = ch;
}
}
buffer[bufpos] = '\0';
return bufpos;
}
size_t utf8_decode(const char* source, size_t srclen, unsigned long* value) {
const unsigned char* s = reinterpret_cast<const unsigned char*>(source);
if ((s[0] & 0x80) == 0x00) { // Check s[0] == 0xxxxxxx
*value = s[0];
return 1;
}
if ((srclen < 2) || ((s[1] & 0xC0) != 0x80)) { // Check s[1] != 10xxxxxx
return 0;
}
// Accumulate the trailer byte values in value16, and combine it with the
// relevant bits from s[0], once we've determined the sequence length.
unsigned long value16 = (s[1] & 0x3F);
if ((s[0] & 0xE0) == 0xC0) { // Check s[0] == 110xxxxx
*value = ((s[0] & 0x1F) << 6) | value16;
return 2;
}
if ((srclen < 3) || ((s[2] & 0xC0) != 0x80)) { // Check s[2] != 10xxxxxx
return 0;
}
value16 = (value16 << 6) | (s[2] & 0x3F);
if ((s[0] & 0xF0) == 0xE0) { // Check s[0] == 1110xxxx
*value = ((s[0] & 0x0F) << 12) | value16;
return 3;
}
if ((srclen < 4) || ((s[3] & 0xC0) != 0x80)) { // Check s[3] != 10xxxxxx
return 0;
}
value16 = (value16 << 6) | (s[3] & 0x3F);
if ((s[0] & 0xF8) == 0xF0) { // Check s[0] == 11110xxx
*value = ((s[0] & 0x07) << 18) | value16;
return 4;
}
return 0;
}
size_t utf8_encode(char* buffer, size_t buflen, unsigned long value) {
if ((value <= 0x7F) && (buflen >= 1)) {
buffer[0] = static_cast<unsigned char>(value);
return 1;
}
if ((value <= 0x7FF) && (buflen >= 2)) {
buffer[0] = 0xC0 | static_cast<unsigned char>(value >> 6);
buffer[1] = 0x80 | static_cast<unsigned char>(value & 0x3F);
return 2;
}
if ((value <= 0xFFFF) && (buflen >= 3)) {
buffer[0] = 0xE0 | static_cast<unsigned char>(value >> 12);
buffer[1] = 0x80 | static_cast<unsigned char>((value >> 6) & 0x3F);
buffer[2] = 0x80 | static_cast<unsigned char>(value & 0x3F);
return 3;
}
if ((value <= 0x1FFFFF) && (buflen >= 4)) {
buffer[0] = 0xF0 | static_cast<unsigned char>(value >> 18);
buffer[1] = 0x80 | static_cast<unsigned char>((value >> 12) & 0x3F);
buffer[2] = 0x80 | static_cast<unsigned char>((value >> 6) & 0x3F);
buffer[3] = 0x80 | static_cast<unsigned char>(value & 0x3F);
return 4;
}
return 0;
}
size_t html_encode(char * buffer, size_t buflen,
const char * source, size_t srclen) {
ASSERT(NULL != buffer); // TODO: estimate output size
if (buflen <= 0)
return 0;
size_t srcpos = 0, bufpos = 0;
while ((srcpos < srclen) && (bufpos + 1 < buflen)) {
unsigned char ch = source[srcpos];
if (ch < 128) {
srcpos += 1;
if (ASCII_CLASS[ch] & HTML_UNSAFE) {
const char * escseq = 0;
size_t esclen = 0;
switch (ch) {
case '<': escseq = "&lt;"; esclen = 4; break;
case '>': escseq = "&gt;"; esclen = 4; break;
case '\'': escseq = "&#39;"; esclen = 5; break;
case '\"': escseq = "&quot;"; esclen = 6; break;
case '&': escseq = "&amp;"; esclen = 5; break;
default: ASSERT(false);
}
if (bufpos + esclen >= buflen) {
break;
}
memcpy(buffer + bufpos, escseq, esclen);
bufpos += esclen;
} else {
buffer[bufpos++] = ch;
}
} else {
// Largest value is 0x1FFFFF => &#2097151; (10 characters)
char escseq[11];
unsigned long val;
if (size_t vallen = utf8_decode(&source[srcpos], srclen - srcpos, &val)) {
srcpos += vallen;
} else {
// Not a valid utf8 sequence, just use the raw character.
val = static_cast<unsigned char>(source[srcpos++]);
}
size_t esclen = sprintfn(escseq, ARRAY_SIZE(escseq), "&#%lu;", val);
if (bufpos + esclen >= buflen) {
break;
}
memcpy(buffer + bufpos, escseq, esclen);
bufpos += esclen;
}
}
buffer[bufpos] = '\0';
return bufpos;
}
size_t html_decode(char * buffer, size_t buflen,
const char * source, size_t srclen) {
ASSERT(NULL != buffer); // TODO: estimate output size
return xml_decode(buffer, buflen, source, srclen);
}
size_t xml_encode(char * buffer, size_t buflen,
const char * source, size_t srclen) {
ASSERT(NULL != buffer); // TODO: estimate output size
if (buflen <= 0)
return 0;
size_t srcpos = 0, bufpos = 0;
while ((srcpos < srclen) && (bufpos + 1 < buflen)) {
unsigned char ch = source[srcpos++];
if ((ch < 128) && (ASCII_CLASS[ch] & XML_UNSAFE)) {
const char * escseq = 0;
size_t esclen = 0;
switch (ch) {
case '<': escseq = "&lt;"; esclen = 4; break;
case '>': escseq = "&gt;"; esclen = 4; break;
case '\'': escseq = "&apos;"; esclen = 6; break;
case '\"': escseq = "&quot;"; esclen = 6; break;
case '&': escseq = "&amp;"; esclen = 5; break;
default: ASSERT(false);
}
if (bufpos + esclen >= buflen) {
break;
}
memcpy(buffer + bufpos, escseq, esclen);
bufpos += esclen;
} else {
buffer[bufpos++] = ch;
}
}
buffer[bufpos] = '\0';
return bufpos;
}
size_t xml_decode(char * buffer, size_t buflen,
const char * source, size_t srclen) {
ASSERT(NULL != buffer); // TODO: estimate output size
if (buflen <= 0)
return 0;
size_t srcpos = 0, bufpos = 0;
while ((srcpos < srclen) && (bufpos + 1 < buflen)) {
unsigned char ch = source[srcpos++];
if (ch != '&') {
buffer[bufpos++] = ch;
} else if ((srcpos + 2 < srclen)
&& (memcmp(source + srcpos, "lt;", 3) == 0)) {
buffer[bufpos++] = '<';
srcpos += 3;
} else if ((srcpos + 2 < srclen)
&& (memcmp(source + srcpos, "gt;", 3) == 0)) {
buffer[bufpos++] = '>';
srcpos += 3;
} else if ((srcpos + 4 < srclen)
&& (memcmp(source + srcpos, "apos;", 5) == 0)) {
buffer[bufpos++] = '\'';
srcpos += 5;
} else if ((srcpos + 4 < srclen)
&& (memcmp(source + srcpos, "quot;", 5) == 0)) {
buffer[bufpos++] = '\"';
srcpos += 5;
} else if ((srcpos + 3 < srclen)
&& (memcmp(source + srcpos, "amp;", 4) == 0)) {
buffer[bufpos++] = '&';
srcpos += 4;
} else if ((srcpos < srclen) && (source[srcpos] == '#')) {
int int_base = 10;
if ((srcpos + 1 < srclen) && (source[srcpos+1] == 'x')) {
int_base = 16;
srcpos += 1;
}
char * ptr;
// TODO: Fix hack (ptr may go past end of data)
unsigned long val = strtoul(source + srcpos + 1, &ptr, int_base);
if ((static_cast<size_t>(ptr - source) < srclen) && (*ptr == ';')) {
srcpos = ptr - source + 1;
} else {
// Not a valid escape sequence.
break;
}
if (size_t esclen = utf8_encode(buffer + bufpos, buflen - bufpos, val)) {
bufpos += esclen;
} else {
// Not enough room to encode the character, or illegal character
break;
}
} else {
// Unrecognized escape sequence.
break;
}
}
buffer[bufpos] = '\0';
return bufpos;
}
std::string hex_encode(const char * source, size_t srclen) {
const size_t kBufferSize = srclen * 2 + 1;
char* buffer = STACK_ARRAY(char, kBufferSize);
size_t length = hex_encode(buffer, kBufferSize, source, srclen);
return std::string(buffer, length);
}
size_t hex_encode(char * buffer, size_t buflen,
const char * csource, size_t srclen) {
ASSERT(NULL != buffer); // TODO: estimate output size
if (buflen <= 0)
return 0;
const unsigned char * bsource =
reinterpret_cast<const unsigned char *>(csource);
size_t srcpos = 0, bufpos = 0;
srclen = _min(srclen, (buflen - 1) / 2);
while (srcpos < srclen) {
unsigned char ch = bsource[srcpos++];
buffer[bufpos ] = hex_encode((ch >> 4) & 0xF);
buffer[bufpos+1] = hex_encode((ch ) & 0xF);
bufpos += 2;
}
buffer[bufpos] = '\0';
return bufpos;
}
size_t hex_decode(char * cbuffer, size_t buflen,
const char * source, size_t srclen) {
ASSERT(NULL != cbuffer); // TODO: estimate output size
if (buflen <= 0)
return 0;
unsigned char * bbuffer = reinterpret_cast<unsigned char *>(cbuffer);
unsigned char h1, h2;
size_t srcpos = 0, bufpos = 0;
while ((srcpos + 1 < srclen)
&& (bufpos + 1 < buflen)
&& hex_decode(source[srcpos], &h1)
&& hex_decode(source[srcpos+1], &h2))
{
bbuffer[bufpos++] = (h1 << 4) | h2;
srcpos += 2;
}
bbuffer[bufpos] = '\0';
return bufpos;
}
size_t transform(std::string& value, size_t maxlen, const std::string& source,
Transform t) {
char* buffer = STACK_ARRAY(char, maxlen + 1);
size_t length = t(buffer, maxlen + 1, source.data(), source.length());
value.assign(buffer, length);
return length;
}
std::string s_transform(const std::string& source, Transform t) {
// Ask transformation function to approximate the destination size (returns upper bound)
size_t maxlen = t(NULL, 0, source.data(), source.length());
char * buffer = STACK_ARRAY(char, maxlen);
size_t len = t(buffer, maxlen, source.data(), source.length());
std::string result(buffer, len);
return result;
}
size_t tokenize(const std::string& source, char delimiter,
std::vector<std::string>* fields) {
ASSERT(NULL != fields);
fields->clear();
size_t last = 0;
for (size_t i = 0; i < source.length(); ++i) {
if (source[i] == delimiter) {
if (i != last) {
fields->push_back(source.substr(last, i - last));
}
last = i + 1;
}
}
if (last != source.length()) {
fields->push_back(source.substr(last, source.length() - last));
}
return fields->size();
}
size_t split(const std::string& source, char delimiter,
std::vector<std::string>* fields) {
ASSERT(NULL != fields);
fields->clear();
size_t last = 0;
for (size_t i = 0; i < source.length(); ++i) {
if (source[i] == delimiter) {
fields->push_back(source.substr(last, i - last));
last = i + 1;
}
}
fields->push_back(source.substr(last, source.length() - last));
return fields->size();
}
char make_char_safe_for_filename(char c) {
if (c < 32)
return '_';
switch (c) {
case '<':
case '>':
case ':':
case '"':
case '/':
case '\\':
case '|':
case '*':
case '?':
return '_';
default:
return c;
}
}
/*
void sprintf(std::string& value, size_t maxlen, const char * format, ...) {
char * buffer = STACK_ARRAY(char, maxlen + 1);
va_list args;
va_start(args, format);
value.assign(buffer, vsprintfn(buffer, maxlen + 1, format, args));
va_end(args);
}
*/
/////////////////////////////////////////////////////////////////////////////
} // namespace talk_base