458 lines
19 KiB
C++
458 lines
19 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// http://code.google.com/p/protobuf/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// from google3/strings/strutil.h
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#ifndef GOOGLE_PROTOBUF_STUBS_STRUTIL_H__
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#define GOOGLE_PROTOBUF_STUBS_STRUTIL_H__
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#include <stdlib.h>
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#include <vector>
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#include <google/protobuf/stubs/common.h>
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namespace google {
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namespace protobuf {
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#ifdef _MSC_VER
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#define strtoll _strtoi64
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#define strtoull _strtoui64
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#elif defined(__DECCXX) && defined(__osf__)
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// HP C++ on Tru64 does not have strtoll, but strtol is already 64-bit.
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#define strtoll strtol
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#define strtoull strtoul
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#endif
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// ----------------------------------------------------------------------
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// ascii_isalnum()
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// Check if an ASCII character is alphanumeric. We can't use ctype's
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// isalnum() because it is affected by locale. This function is applied
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// to identifiers in the protocol buffer language, not to natural-language
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// strings, so locale should not be taken into account.
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// ascii_isdigit()
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// Like above, but only accepts digits.
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// ----------------------------------------------------------------------
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inline bool ascii_isalnum(char c) {
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return ('a' <= c && c <= 'z') ||
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('A' <= c && c <= 'Z') ||
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('0' <= c && c <= '9');
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}
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inline bool ascii_isdigit(char c) {
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return ('0' <= c && c <= '9');
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}
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// ----------------------------------------------------------------------
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// HasPrefixString()
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// Check if a string begins with a given prefix.
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// StripPrefixString()
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// Given a string and a putative prefix, returns the string minus the
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// prefix string if the prefix matches, otherwise the original
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// string.
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// ----------------------------------------------------------------------
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inline bool HasPrefixString(const string& str,
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const string& prefix) {
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return str.size() >= prefix.size() &&
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str.compare(0, prefix.size(), prefix) == 0;
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}
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inline string StripPrefixString(const string& str, const string& prefix) {
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if (HasPrefixString(str, prefix)) {
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return str.substr(prefix.size());
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} else {
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return str;
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}
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}
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// ----------------------------------------------------------------------
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// HasSuffixString()
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// Return true if str ends in suffix.
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// StripSuffixString()
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// Given a string and a putative suffix, returns the string minus the
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// suffix string if the suffix matches, otherwise the original
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// string.
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// ----------------------------------------------------------------------
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inline bool HasSuffixString(const string& str,
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const string& suffix) {
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return str.size() >= suffix.size() &&
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str.compare(str.size() - suffix.size(), suffix.size(), suffix) == 0;
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}
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inline string StripSuffixString(const string& str, const string& suffix) {
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if (HasSuffixString(str, suffix)) {
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return str.substr(0, str.size() - suffix.size());
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} else {
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return str;
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}
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}
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// ----------------------------------------------------------------------
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// StripString
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// Replaces any occurrence of the character 'remove' (or the characters
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// in 'remove') with the character 'replacewith'.
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// Good for keeping html characters or protocol characters (\t) out
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// of places where they might cause a problem.
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT void StripString(string* s, const char* remove,
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char replacewith);
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// ----------------------------------------------------------------------
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// LowerString()
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// UpperString()
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// Convert the characters in "s" to lowercase or uppercase. ASCII-only:
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// these functions intentionally ignore locale because they are applied to
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// identifiers used in the Protocol Buffer language, not to natural-language
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// strings.
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// ----------------------------------------------------------------------
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inline void LowerString(string * s) {
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string::iterator end = s->end();
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for (string::iterator i = s->begin(); i != end; ++i) {
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// tolower() changes based on locale. We don't want this!
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if ('A' <= *i && *i <= 'Z') *i += 'a' - 'A';
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}
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}
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inline void UpperString(string * s) {
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string::iterator end = s->end();
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for (string::iterator i = s->begin(); i != end; ++i) {
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// toupper() changes based on locale. We don't want this!
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if ('a' <= *i && *i <= 'z') *i += 'A' - 'a';
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}
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}
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// ----------------------------------------------------------------------
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// StringReplace()
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// Give me a string and two patterns "old" and "new", and I replace
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// the first instance of "old" in the string with "new", if it
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// exists. RETURN a new string, regardless of whether the replacement
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// happened or not.
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT string StringReplace(const string& s, const string& oldsub,
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const string& newsub, bool replace_all);
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// ----------------------------------------------------------------------
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// SplitStringUsing()
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// Split a string using a character delimiter. Append the components
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// to 'result'. If there are consecutive delimiters, this function skips
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// over all of them.
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT void SplitStringUsing(const string& full, const char* delim,
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vector<string>* res);
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// ----------------------------------------------------------------------
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// JoinStrings()
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// These methods concatenate a vector of strings into a C++ string, using
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// the C-string "delim" as a separator between components. There are two
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// flavors of the function, one flavor returns the concatenated string,
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// another takes a pointer to the target string. In the latter case the
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// target string is cleared and overwritten.
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT void JoinStrings(const vector<string>& components,
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const char* delim, string* result);
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inline string JoinStrings(const vector<string>& components,
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const char* delim) {
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string result;
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JoinStrings(components, delim, &result);
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return result;
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}
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// ----------------------------------------------------------------------
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// UnescapeCEscapeSequences()
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// Copies "source" to "dest", rewriting C-style escape sequences
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// -- '\n', '\r', '\\', '\ooo', etc -- to their ASCII
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// equivalents. "dest" must be sufficiently large to hold all
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// the characters in the rewritten string (i.e. at least as large
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// as strlen(source) + 1 should be safe, since the replacements
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// are always shorter than the original escaped sequences). It's
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// safe for source and dest to be the same. RETURNS the length
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// of dest.
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//
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// It allows hex sequences \xhh, or generally \xhhhhh with an
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// arbitrary number of hex digits, but all of them together must
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// specify a value of a single byte (e.g. \x0045 is equivalent
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// to \x45, and \x1234 is erroneous).
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//
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// It also allows escape sequences of the form \uhhhh (exactly four
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// hex digits, upper or lower case) or \Uhhhhhhhh (exactly eight
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// hex digits, upper or lower case) to specify a Unicode code
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// point. The dest array will contain the UTF8-encoded version of
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// that code-point (e.g., if source contains \u2019, then dest will
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// contain the three bytes 0xE2, 0x80, and 0x99).
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//
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// Errors: In the first form of the call, errors are reported with
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// LOG(ERROR). The same is true for the second form of the call if
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// the pointer to the string vector is NULL; otherwise, error
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// messages are stored in the vector. In either case, the effect on
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// the dest array is not defined, but rest of the source will be
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// processed.
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT int UnescapeCEscapeSequences(const char* source, char* dest);
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LIBPROTOBUF_EXPORT int UnescapeCEscapeSequences(const char* source, char* dest,
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vector<string> *errors);
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// ----------------------------------------------------------------------
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// UnescapeCEscapeString()
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// This does the same thing as UnescapeCEscapeSequences, but creates
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// a new string. The caller does not need to worry about allocating
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// a dest buffer. This should be used for non performance critical
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// tasks such as printing debug messages. It is safe for src and dest
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// to be the same.
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//
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// The second call stores its errors in a supplied string vector.
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// If the string vector pointer is NULL, it reports the errors with LOG().
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//
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// In the first and second calls, the length of dest is returned. In the
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// the third call, the new string is returned.
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT int UnescapeCEscapeString(const string& src, string* dest);
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LIBPROTOBUF_EXPORT int UnescapeCEscapeString(const string& src, string* dest,
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vector<string> *errors);
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LIBPROTOBUF_EXPORT string UnescapeCEscapeString(const string& src);
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// ----------------------------------------------------------------------
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// CEscapeString()
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// Copies 'src' to 'dest', escaping dangerous characters using
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// C-style escape sequences. This is very useful for preparing query
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// flags. 'src' and 'dest' should not overlap.
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// Returns the number of bytes written to 'dest' (not including the \0)
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// or -1 if there was insufficient space.
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//
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// Currently only \n, \r, \t, ", ', \ and !isprint() chars are escaped.
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT int CEscapeString(const char* src, int src_len,
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char* dest, int dest_len);
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// ----------------------------------------------------------------------
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// CEscape()
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// More convenient form of CEscapeString: returns result as a "string".
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// This version is slower than CEscapeString() because it does more
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// allocation. However, it is much more convenient to use in
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// non-speed-critical code like logging messages etc.
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT string CEscape(const string& src);
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namespace strings {
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// Like CEscape() but does not escape bytes with the upper bit set.
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LIBPROTOBUF_EXPORT string Utf8SafeCEscape(const string& src);
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// Like CEscape() but uses hex (\x) escapes instead of octals.
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LIBPROTOBUF_EXPORT string CHexEscape(const string& src);
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} // namespace strings
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// ----------------------------------------------------------------------
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// strto32()
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// strtou32()
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// strto64()
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// strtou64()
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// Architecture-neutral plug compatible replacements for strtol() and
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// strtoul(). Long's have different lengths on ILP-32 and LP-64
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// platforms, so using these is safer, from the point of view of
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// overflow behavior, than using the standard libc functions.
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT int32 strto32_adaptor(const char *nptr, char **endptr,
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int base);
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LIBPROTOBUF_EXPORT uint32 strtou32_adaptor(const char *nptr, char **endptr,
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int base);
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inline int32 strto32(const char *nptr, char **endptr, int base) {
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if (sizeof(int32) == sizeof(long))
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return strtol(nptr, endptr, base);
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else
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return strto32_adaptor(nptr, endptr, base);
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}
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inline uint32 strtou32(const char *nptr, char **endptr, int base) {
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if (sizeof(uint32) == sizeof(unsigned long))
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return strtoul(nptr, endptr, base);
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else
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return strtou32_adaptor(nptr, endptr, base);
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}
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// For now, long long is 64-bit on all the platforms we care about, so these
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// functions can simply pass the call to strto[u]ll.
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inline int64 strto64(const char *nptr, char **endptr, int base) {
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GOOGLE_COMPILE_ASSERT(sizeof(int64) == sizeof(long long),
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sizeof_int64_is_not_sizeof_long_long);
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return strtoll(nptr, endptr, base);
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}
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inline uint64 strtou64(const char *nptr, char **endptr, int base) {
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GOOGLE_COMPILE_ASSERT(sizeof(uint64) == sizeof(unsigned long long),
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sizeof_uint64_is_not_sizeof_long_long);
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return strtoull(nptr, endptr, base);
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}
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// ----------------------------------------------------------------------
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// FastIntToBuffer()
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// FastHexToBuffer()
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// FastHex64ToBuffer()
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// FastHex32ToBuffer()
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// FastTimeToBuffer()
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// These are intended for speed. FastIntToBuffer() assumes the
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// integer is non-negative. FastHexToBuffer() puts output in
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// hex rather than decimal. FastTimeToBuffer() puts the output
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// into RFC822 format.
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//
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// FastHex64ToBuffer() puts a 64-bit unsigned value in hex-format,
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// padded to exactly 16 bytes (plus one byte for '\0')
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//
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// FastHex32ToBuffer() puts a 32-bit unsigned value in hex-format,
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// padded to exactly 8 bytes (plus one byte for '\0')
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//
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// All functions take the output buffer as an arg.
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// They all return a pointer to the beginning of the output,
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// which may not be the beginning of the input buffer.
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// ----------------------------------------------------------------------
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// Suggested buffer size for FastToBuffer functions. Also works with
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// DoubleToBuffer() and FloatToBuffer().
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static const int kFastToBufferSize = 32;
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LIBPROTOBUF_EXPORT char* FastInt32ToBuffer(int32 i, char* buffer);
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LIBPROTOBUF_EXPORT char* FastInt64ToBuffer(int64 i, char* buffer);
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char* FastUInt32ToBuffer(uint32 i, char* buffer); // inline below
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char* FastUInt64ToBuffer(uint64 i, char* buffer); // inline below
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LIBPROTOBUF_EXPORT char* FastHexToBuffer(int i, char* buffer);
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LIBPROTOBUF_EXPORT char* FastHex64ToBuffer(uint64 i, char* buffer);
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LIBPROTOBUF_EXPORT char* FastHex32ToBuffer(uint32 i, char* buffer);
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// at least 22 bytes long
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inline char* FastIntToBuffer(int i, char* buffer) {
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return (sizeof(i) == 4 ?
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FastInt32ToBuffer(i, buffer) : FastInt64ToBuffer(i, buffer));
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}
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inline char* FastUIntToBuffer(unsigned int i, char* buffer) {
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return (sizeof(i) == 4 ?
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FastUInt32ToBuffer(i, buffer) : FastUInt64ToBuffer(i, buffer));
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}
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inline char* FastLongToBuffer(long i, char* buffer) {
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return (sizeof(i) == 4 ?
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FastInt32ToBuffer(i, buffer) : FastInt64ToBuffer(i, buffer));
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}
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inline char* FastULongToBuffer(unsigned long i, char* buffer) {
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return (sizeof(i) == 4 ?
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FastUInt32ToBuffer(i, buffer) : FastUInt64ToBuffer(i, buffer));
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}
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// ----------------------------------------------------------------------
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// FastInt32ToBufferLeft()
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// FastUInt32ToBufferLeft()
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// FastInt64ToBufferLeft()
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// FastUInt64ToBufferLeft()
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//
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// Like the Fast*ToBuffer() functions above, these are intended for speed.
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// Unlike the Fast*ToBuffer() functions, however, these functions write
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// their output to the beginning of the buffer (hence the name, as the
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// output is left-aligned). The caller is responsible for ensuring that
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// the buffer has enough space to hold the output.
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//
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// Returns a pointer to the end of the string (i.e. the null character
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// terminating the string).
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT char* FastInt32ToBufferLeft(int32 i, char* buffer);
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LIBPROTOBUF_EXPORT char* FastUInt32ToBufferLeft(uint32 i, char* buffer);
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LIBPROTOBUF_EXPORT char* FastInt64ToBufferLeft(int64 i, char* buffer);
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LIBPROTOBUF_EXPORT char* FastUInt64ToBufferLeft(uint64 i, char* buffer);
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// Just define these in terms of the above.
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inline char* FastUInt32ToBuffer(uint32 i, char* buffer) {
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FastUInt32ToBufferLeft(i, buffer);
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return buffer;
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}
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inline char* FastUInt64ToBuffer(uint64 i, char* buffer) {
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FastUInt64ToBufferLeft(i, buffer);
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return buffer;
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}
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// ----------------------------------------------------------------------
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// SimpleItoa()
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// Description: converts an integer to a string.
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//
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// Return value: string
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT string SimpleItoa(int i);
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LIBPROTOBUF_EXPORT string SimpleItoa(unsigned int i);
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LIBPROTOBUF_EXPORT string SimpleItoa(long i);
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LIBPROTOBUF_EXPORT string SimpleItoa(unsigned long i);
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LIBPROTOBUF_EXPORT string SimpleItoa(long long i);
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LIBPROTOBUF_EXPORT string SimpleItoa(unsigned long long i);
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// ----------------------------------------------------------------------
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// SimpleDtoa()
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// SimpleFtoa()
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// DoubleToBuffer()
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// FloatToBuffer()
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// Description: converts a double or float to a string which, if
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// passed to NoLocaleStrtod(), will produce the exact same original double
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// (except in case of NaN; all NaNs are considered the same value).
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// We try to keep the string short but it's not guaranteed to be as
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// short as possible.
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//
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// DoubleToBuffer() and FloatToBuffer() write the text to the given
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// buffer and return it. The buffer must be at least
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// kDoubleToBufferSize bytes for doubles and kFloatToBufferSize
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// bytes for floats. kFastToBufferSize is also guaranteed to be large
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// enough to hold either.
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//
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// Return value: string
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT string SimpleDtoa(double value);
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LIBPROTOBUF_EXPORT string SimpleFtoa(float value);
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LIBPROTOBUF_EXPORT char* DoubleToBuffer(double i, char* buffer);
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LIBPROTOBUF_EXPORT char* FloatToBuffer(float i, char* buffer);
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// In practice, doubles should never need more than 24 bytes and floats
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// should never need more than 14 (including null terminators), but we
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// overestimate to be safe.
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static const int kDoubleToBufferSize = 32;
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static const int kFloatToBufferSize = 24;
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// ----------------------------------------------------------------------
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// NoLocaleStrtod()
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// Exactly like strtod(), except it always behaves as if in the "C"
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// locale (i.e. decimal points must be '.'s).
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// ----------------------------------------------------------------------
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LIBPROTOBUF_EXPORT double NoLocaleStrtod(const char* text, char** endptr);
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} // namespace protobuf
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} // namespace google
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#endif // GOOGLE_PROTOBUF_STUBS_STRUTIL_H__
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