mirror of
https://github.com/mozilla/gecko-dev.git
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360 lines
9.1 KiB
C++
360 lines
9.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "Base64.h"
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#include "nsIInputStream.h"
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#include "nsString.h"
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#include "plbase64.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 =
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(unsigned char*)"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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template<typename T>
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static void
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Encode3to4(const unsigned char* aSrc, T* aDest)
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{
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uint32_t b32 = (uint32_t)0;
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int i, j = 18;
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for (i = 0; i < 3; ++i) {
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b32 <<= 8;
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b32 |= (uint32_t)aSrc[i];
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}
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for (i = 0; i < 4; ++i) {
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aDest[i] = base[(uint32_t)((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* aSrc, T* aDest)
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{
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aDest[0] = base[(uint32_t)((aSrc[0] >> 2) & 0x3F)];
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aDest[1] = base[(uint32_t)(((aSrc[0] & 0x03) << 4) | ((aSrc[1] >> 4) & 0x0F))];
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aDest[2] = base[(uint32_t)((aSrc[1] & 0x0F) << 2)];
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aDest[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* aSrc, T* aDest)
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{
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aDest[0] = base[(uint32_t)((aSrc[0] >> 2) & 0x3F)];
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aDest[1] = base[(uint32_t)((aSrc[0] & 0x03) << 4)];
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aDest[2] = (unsigned char)'=';
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aDest[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* aSrc, uint32_t aSrcLen, T* aDest)
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{
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while (aSrcLen >= 3) {
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Encode3to4(aSrc, aDest);
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aSrc += 3;
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aDest += 4;
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aSrcLen -= 3;
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}
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switch (aSrcLen) {
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case 2:
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Encode2to4(aSrc, aDest);
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break;
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case 1:
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Encode1to4(aSrc, aDest);
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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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{
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unsigned char c[3];
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uint8_t 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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uint32_t aToOffset,
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uint32_t aCount,
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uint32_t* 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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uint32_t 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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uint32_t 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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uint32_t aCount,
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uint32_t aOffset)
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{
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nsresult rv;
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uint64_t count64 = aCount;
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if (!aCount) {
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rv = aInputStream->Available(&count64);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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// if count64 is over 4GB, it will be failed at the below condition,
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// then will return NS_ERROR_OUT_OF_MEMORY
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aCount = (uint32_t)count64;
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}
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uint64_t countlong =
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(count64 + 2) / 3 * 4; // +2 due to integer math.
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if (countlong + aOffset > UINT32_MAX) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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uint32_t count = uint32_t(countlong);
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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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}
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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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uint32_t 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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}
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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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}
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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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}
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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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}
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if (aDest.Length()) {
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// May belong to an nsCString with an unallocated buffer, so only null
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// terminate if there is a need to.
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*aDest.EndWriting() = '\0';
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}
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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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uint32_t aCount,
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uint32_t 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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uint32_t aCount,
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uint32_t aOffset)
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{
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return EncodeInputStream<nsAString>(aInputStream, aDest, aCount, aOffset);
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}
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nsresult
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Base64Encode(const nsACString& aBinaryData, nsACString& aString)
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{
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// Check for overflow.
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if (aBinaryData.Length() > (UINT32_MAX / 4) * 3) {
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return NS_ERROR_FAILURE;
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}
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// Don't ask PR_Base64Encode to encode empty strings
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if (aBinaryData.IsEmpty()) {
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aString.Truncate();
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return NS_OK;
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}
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uint32_t stringLen = ((aBinaryData.Length() + 2) / 3) * 4;
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char* buffer;
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// Add one byte for null termination.
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if (aString.SetCapacity(stringLen + 1, fallible_t()) &&
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(buffer = aString.BeginWriting()) &&
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PL_Base64Encode(aBinaryData.BeginReading(), aBinaryData.Length(), buffer)) {
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// PL_Base64Encode doesn't null terminate the buffer for us when we pass
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// the buffer in. Do that manually.
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buffer[stringLen] = '\0';
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aString.SetLength(stringLen);
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return NS_OK;
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}
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aString.Truncate();
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return NS_ERROR_INVALID_ARG;
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}
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nsresult
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Base64Encode(const nsAString& aString, nsAString& aBinaryData)
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{
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NS_LossyConvertUTF16toASCII string(aString);
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nsAutoCString binaryData;
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nsresult rv = Base64Encode(string, binaryData);
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if (NS_SUCCEEDED(rv)) {
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CopyASCIItoUTF16(binaryData, aBinaryData);
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} else {
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aBinaryData.Truncate();
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}
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return rv;
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}
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nsresult
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Base64Decode(const nsACString& aString, nsACString& aBinaryData)
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{
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// Check for overflow.
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if (aString.Length() > UINT32_MAX / 3) {
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return NS_ERROR_FAILURE;
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}
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// Don't ask PR_Base64Decode to decode the empty string
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if (aString.IsEmpty()) {
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aBinaryData.Truncate();
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return NS_OK;
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}
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uint32_t binaryDataLen = ((aString.Length() * 3) / 4);
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char* buffer;
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// Add one byte for null termination.
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if (aBinaryData.SetCapacity(binaryDataLen + 1, fallible_t()) &&
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(buffer = aBinaryData.BeginWriting()) &&
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PL_Base64Decode(aString.BeginReading(), aString.Length(), buffer)) {
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// PL_Base64Decode doesn't null terminate the buffer for us when we pass
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// the buffer in. Do that manually, taking into account the number of '='
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// characters we were passed.
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if (!aString.IsEmpty() && aString[aString.Length() - 1] == '=') {
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if (aString.Length() > 1 && aString[aString.Length() - 2] == '=') {
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binaryDataLen -= 2;
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} else {
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binaryDataLen -= 1;
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}
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}
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buffer[binaryDataLen] = '\0';
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aBinaryData.SetLength(binaryDataLen);
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return NS_OK;
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}
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aBinaryData.Truncate();
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return NS_ERROR_INVALID_ARG;
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}
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nsresult
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Base64Decode(const nsAString& aBinaryData, nsAString& aString)
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{
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NS_LossyConvertUTF16toASCII binaryData(aBinaryData);
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nsAutoCString string;
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nsresult rv = Base64Decode(binaryData, string);
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if (NS_SUCCEEDED(rv)) {
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CopyASCIItoUTF16(string, aString);
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} else {
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aString.Truncate();
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}
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return rv;
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}
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} // namespace mozilla
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