Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/text/Base64.cpp

-/*
-   Copyright (C) 2000-2001 Dawit Alemayehu <adawit@kde.org>
-   Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
-   Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
-   Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License (LGPL)
-   version 2 as published by the Free Software Foundation.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-
-   This code is based on the java implementation in HTTPClient
-   package by Ronald Tschalär Copyright (C) 1996-1999.
-*/
-
-#include "config.h"
-#include "Base64.h"
-
-#include <limits.h>
-#include <wtf/StringExtras.h>
-#include <wtf/text/WTFString.h>
-
-namespace WTF {
-
-static const char base64EncMap[64] = {
-    0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
-    0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
-    0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
-    0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
-    0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,
-    0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,
-    0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33,
-    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2B, 0x2F
-};
-
-static const char base64DecMap[128] = {
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0x00, 0x00, 0x3E, 0x00, 0x00, 0x00, 0x3F,
-    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
-    0x3C, 0x3D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
-    0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
-    0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
-    0x17, 0x18, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
-    0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
-    0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
-    0x31, 0x32, 0x33, 0x00, 0x00, 0x00, 0x00, 0x00
-};
-
-String base64Encode(const char* data, unsigned length, Base64EncodePolicy policy)
-{
-    Vector<char> result;
-    base64Encode(data, length, result, policy);
-    return String(result.data(), result.size());
-}
-
-void base64Encode(const char* data, unsigned len, Vector<char>& out, Base64EncodePolicy policy)
-{
-    out.clear();
-    if (!len)
-        return;
-
-    // If the input string is pathologically large, just return nothing.
-    // Note: Keep this in sync with the "outLength" computation below.
-    // Rather than being perfectly precise, this is a bit conservative.
-    const unsigned maxInputBufferSize = UINT_MAX / 77 * 76 / 4 * 3 - 2;
-    if (len > maxInputBufferSize)
-        return;
-
-    unsigned sidx = 0;
-    unsigned didx = 0;
-
-    unsigned outLength = ((len + 2) / 3) * 4;
-
-    // Deal with the 76 character per line limit specified in RFC 2045.
-    bool insertLFs = (policy == Base64InsertLFs && outLength > 76);
-    if (insertLFs)
-        outLength += ((outLength - 1) / 76);
-
-    int count = 0;
-    out.grow(outLength);
-
-    // 3-byte to 4-byte conversion + 0-63 to ascii printable conversion
-    if (len > 1) {
-        while (sidx < len - 2) {
-            if (insertLFs) {
-                if (count && !(count % 76))
-                    out[didx++] = '\n';
-                count += 4;
-            }
-            out[didx++] = base64EncMap[(data[sidx] >> 2) & 077];
-            out[didx++] = base64EncMap[((data[sidx + 1] >> 4) & 017) | ((data[sidx] << 4) & 077)];
-            out[didx++] = base64EncMap[((data[sidx + 2] >> 6) & 003) | ((data[sidx + 1] << 2) & 077)];
-            out[didx++] = base64EncMap[data[sidx + 2] & 077];
-            sidx += 3;
-        }
-    }
-
-    if (sidx < len) {
-        if (insertLFs && (count > 0) && !(count % 76))
-           out[didx++] = '\n';
-
-        out[didx++] = base64EncMap[(data[sidx] >> 2) & 077];
-        if (sidx < len - 1) {
-            out[didx++] = base64EncMap[((data[sidx + 1] >> 4) & 017) | ((data[sidx] << 4) & 077)];
-            out[didx++] = base64EncMap[(data[sidx + 1] << 2) & 077];
-        } else
-            out[didx++] = base64EncMap[(data[sidx] << 4) & 077];
-    }
-
-    // Add padding
-    while (didx < out.size()) {
-        out[didx] = '=';
-        ++didx;
-    }
-}
-
-bool base64Decode(const Vector<char>& in, Vector<char>& out, Base64DecodePolicy policy)
-{
-    out.clear();
-
-    // If the input string is pathologically large, just return nothing.
-    if (in.size() > UINT_MAX)
-        return false;
-
-    return base64Decode(in.data(), in.size(), out, policy);
-}
-
-template<typename T>
-static inline bool base64DecodeInternal(const T* data, unsigned len, Vector<char>& out, Base64DecodePolicy policy)
-{
-    out.clear();
-    if (!len)
-        return true;
-
-    out.grow(len);
-
-    bool sawEqualsSign = false;
-    unsigned outLength = 0;
-    for (unsigned idx = 0; idx < len; ++idx) {
-        unsigned ch = data[idx];
-        if (ch == '=')
-            sawEqualsSign = true;
-        else if (('0' <= ch && ch <= '9') || ('A' <= ch && ch <= 'Z') || ('a' <= ch && ch <= 'z') || ch == '+' || ch == '/') {
-            if (sawEqualsSign)
-                return false;
-            out[outLength] = base64DecMap[ch];
-            ++outLength;
-        } else if (policy == Base64FailOnInvalidCharacter || (policy == Base64IgnoreWhitespace && !isSpaceOrNewline(ch)))
-            return false;
-    }
-
-    if (!outLength)
-        return !sawEqualsSign;
-
-    // Valid data is (n * 4 + [0,2,3]) characters long.
-    if ((outLength % 4) == 1)
-        return false;
-    
-    // 4-byte to 3-byte conversion
-    outLength -= (outLength + 3) / 4;
-    if (!outLength)
-        return false;
-
-    unsigned sidx = 0;
-    unsigned didx = 0;
-    if (outLength > 1) {
-        while (didx < outLength - 2) {
-            out[didx] = (((out[sidx] << 2) & 255) | ((out[sidx + 1] >> 4) & 003));
-            out[didx + 1] = (((out[sidx + 1] << 4) & 255) | ((out[sidx + 2] >> 2) & 017));
-            out[didx + 2] = (((out[sidx + 2] << 6) & 255) | (out[sidx + 3] & 077));
-            sidx += 4;
-            didx += 3;
-        }
-    }
-
-    if (didx < outLength)
-        out[didx] = (((out[sidx] << 2) & 255) | ((out[sidx + 1] >> 4) & 003));
-
-    if (++didx < outLength)
-        out[didx] = (((out[sidx + 1] << 4) & 255) | ((out[sidx + 2] >> 2) & 017));
-
-    if (outLength < out.size())
-        out.shrink(outLength);
-
-    return true;
-}
-
-bool base64Decode(const char* data, unsigned len, Vector<char>& out, Base64DecodePolicy policy)
-{
-    return base64DecodeInternal<char>(data, len, out, policy);
-}
-
-bool base64Decode(const String& in, Vector<char>& out, Base64DecodePolicy policy)
-{
-    return base64DecodeInternal<UChar>(in.characters(), in.length(), out, policy);
-}
-
-} // namespace WTF