mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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259 lines
7.4 KiB
C++
259 lines
7.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape Portable Runtime (NSPR).
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Kyle Huey <me@kylehuey.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "Base64.h"
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#include "nsIInputStream.h"
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namespace {
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// BEGIN base64 encode code copied and modified from NSPR
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const unsigned char *base = (unsigned char *)"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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template <typename T>
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static void
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Encode3to4(const unsigned char *src, T *dest)
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{
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PRUint32 b32 = (PRUint32)0;
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PRIntn i, j = 18;
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for( i = 0; i < 3; i++ )
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{
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b32 <<= 8;
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b32 |= (PRUint32)src[i];
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}
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for( i = 0; i < 4; i++ )
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{
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dest[i] = base[ (PRUint32)((b32>>j) & 0x3F) ];
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j -= 6;
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}
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}
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template <typename T>
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static void
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Encode2to4(const unsigned char *src, T *dest)
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{
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dest[0] = base[ (PRUint32)((src[0]>>2) & 0x3F) ];
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dest[1] = base[ (PRUint32)(((src[0] & 0x03) << 4) | ((src[1] >> 4) & 0x0F)) ];
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dest[2] = base[ (PRUint32)((src[1] & 0x0F) << 2) ];
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dest[3] = (unsigned char)'=';
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}
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template <typename T>
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static void
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Encode1to4(const unsigned char *src, T *dest)
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{
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dest[0] = base[ (PRUint32)((src[0]>>2) & 0x3F) ];
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dest[1] = base[ (PRUint32)((src[0] & 0x03) << 4) ];
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dest[2] = (unsigned char)'=';
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dest[3] = (unsigned char)'=';
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}
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template <typename T>
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static void
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Encode(const unsigned char *src, PRUint32 srclen, T *dest)
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{
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while( srclen >= 3 )
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{
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Encode3to4(src, dest);
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src += 3;
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dest += 4;
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srclen -= 3;
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}
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switch( srclen )
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{
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case 2:
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Encode2to4(src, dest);
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break;
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case 1:
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Encode1to4(src, dest);
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break;
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case 0:
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break;
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default:
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NS_NOTREACHED("coding error");
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}
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}
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// END base64 encode code copied and modified from NSPR.
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template <typename T>
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struct EncodeInputStream_State {
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unsigned char c[3];
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PRUint8 charsOnStack;
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typename T::char_type* buffer;
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};
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template <typename T>
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NS_METHOD
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EncodeInputStream_Encoder(nsIInputStream *aStream,
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void *aClosure,
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const char *aFromSegment,
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PRUint32 aToOffset,
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PRUint32 aCount,
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PRUint32 *aWriteCount)
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{
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NS_ASSERTION(aCount > 0, "Er, what?");
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EncodeInputStream_State<T>* state =
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static_cast<EncodeInputStream_State<T>*>(aClosure);
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// If we have any data left from last time, encode it now.
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PRUint32 countRemaining = aCount;
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const unsigned char *src = (const unsigned char*)aFromSegment;
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if (state->charsOnStack) {
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unsigned char firstSet[4];
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if (state->charsOnStack == 1) {
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firstSet[0] = state->c[0];
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firstSet[1] = src[0];
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firstSet[2] = (countRemaining > 1) ? src[1] : '\0';
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firstSet[3] = '\0';
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} else /* state->charsOnStack == 2 */ {
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firstSet[0] = state->c[0];
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firstSet[1] = state->c[1];
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firstSet[2] = src[0];
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firstSet[3] = '\0';
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}
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Encode(firstSet, 3, state->buffer);
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state->buffer += 4;
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countRemaining -= (3 - state->charsOnStack);
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src += (3 - state->charsOnStack);
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state->charsOnStack = 0;
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}
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// Encode the bulk of the
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PRUint32 encodeLength = countRemaining - countRemaining % 3;
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NS_ABORT_IF_FALSE(encodeLength % 3 == 0,
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"Should have an exact number of triplets!");
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Encode(src, encodeLength, state->buffer);
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state->buffer += (encodeLength / 3) * 4;
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src += encodeLength;
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countRemaining -= encodeLength;
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// We must consume all data, so if there's some data left stash it
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*aWriteCount = aCount;
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if (countRemaining) {
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// We should never have a full triplet left at this point.
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NS_ABORT_IF_FALSE(countRemaining < 3, "We should have encoded more!");
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state->c[0] = src[0];
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state->c[1] = (countRemaining == 2) ? src[1] : '\0';
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state->charsOnStack = countRemaining;
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}
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return NS_OK;
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}
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template <typename T>
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nsresult
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EncodeInputStream(nsIInputStream *aInputStream,
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T &aDest,
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PRUint32 aCount,
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PRUint32 aOffset)
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{
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nsresult rv;
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if (!aCount) {
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rv = aInputStream->Available(&aCount);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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PRUint32 count = (aCount + 2) / 3 * 4; // +2 due to integer math.
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aDest.SetLength(count + aOffset);
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if (aDest.Length() != count + aOffset)
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return NS_ERROR_OUT_OF_MEMORY;
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EncodeInputStream_State<T> state;
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state.charsOnStack = 0;
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state.c[2] = '\0';
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state.buffer = aOffset + aDest.BeginWriting();
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while (1) {
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PRUint32 read = 0;
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rv = aInputStream->ReadSegments(&EncodeInputStream_Encoder<T>,
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(void*)&state,
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aCount,
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&read);
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if (NS_FAILED(rv)) {
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if (rv == NS_BASE_STREAM_WOULD_BLOCK)
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NS_RUNTIMEABORT("Not implemented for async streams!");
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if (rv == NS_ERROR_NOT_IMPLEMENTED)
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NS_RUNTIMEABORT("Requires a stream that implements ReadSegments!");
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return rv;
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}
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if (!read)
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break;
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}
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// Finish encoding if anything is left
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if (state.charsOnStack)
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Encode(state.c, state.charsOnStack, state.buffer);
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*aDest.EndWriting() = '\0';
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return NS_OK;
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}
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} // namespace (anonymous)
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namespace mozilla {
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nsresult
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Base64EncodeInputStream(nsIInputStream *aInputStream,
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nsACString &aDest,
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PRUint32 aCount,
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PRUint32 aOffset)
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{
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return EncodeInputStream<nsACString>(aInputStream, aDest, aCount, aOffset);
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}
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nsresult
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Base64EncodeInputStream(nsIInputStream *aInputStream,
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nsAString &aDest,
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PRUint32 aCount,
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PRUint32 aOffset)
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{
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return EncodeInputStream<nsAString>(aInputStream, aDest, aCount, aOffset);
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}
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} // namespace mozilla
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