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147 lines
3.5 KiB
147 lines
3.5 KiB
/*
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* Copyright 2017 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "Firebase/Messaging/FIRMessagingCodedInputStream.h"
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#import "Firebase/Messaging/FIRMMessageCode.h"
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#import "Firebase/Messaging/FIRMessagingLogger.h"
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typedef struct {
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const void *bytes;
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size_t bufferSize;
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size_t bufferPos;
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} BufferState;
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static BOOL CheckSize(BufferState *state, size_t size) {
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size_t newSize = state->bufferPos + size;
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if (newSize > state->bufferSize) {
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return NO;
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}
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return YES;
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}
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static BOOL ReadRawByte(BufferState *state, int8_t *output) {
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if (state == NULL || output == NULL) {
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FIRMessagingLoggerDebug(kFIRMessagingCodeInputStreamInvalidParameters, @"Invalid parameters.");
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}
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if (output != nil && CheckSize(state, sizeof(int8_t))) {
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*output = ((int8_t *)state->bytes)[state->bufferPos++];
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return YES;
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}
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return NO;
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}
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static BOOL ReadRawVarInt32(BufferState *state, int32_t *output) {
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if (state == NULL || output == NULL) {
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FIRMessagingLoggerDebug(kFIRMessagingCodeInputStreamInvalidParameters, @"Invalid parameters.");
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return NO;
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}
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int8_t tmp = 0;
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if (!ReadRawByte(state, &tmp)) {
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return NO;
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}
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if (tmp >= 0) {
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*output = tmp;
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return YES;
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}
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int32_t result = tmp & 0x7f;
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if (!ReadRawByte(state, &tmp)) {
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return NO;
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}
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if (tmp >= 0) {
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result |= tmp << 7;
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} else {
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result |= (tmp & 0x7f) << 7;
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if (!ReadRawByte(state, &tmp)) {
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return NO;
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}
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if (tmp >= 0) {
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result |= tmp << 14;
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} else {
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result |= (tmp & 0x7f) << 14;
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if (!ReadRawByte(state, &tmp)) {
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return NO;
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}
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if (tmp >= 0) {
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result |= tmp << 21;
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} else {
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result |= (tmp & 0x7f) << 21;
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if (!ReadRawByte(state, &tmp)) {
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return NO;
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}
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result |= tmp << 28;
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if (tmp < 0) {
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// Discard upper 32 bits.
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for (int i = 0; i < 5; ++i) {
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if (!ReadRawByte(state, &tmp)) {
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return NO;
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}
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if (tmp >= 0) {
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*output = result;
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return YES;
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}
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}
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return NO;
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}
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}
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}
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}
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*output = result;
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return YES;
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}
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@interface FIRMessagingCodedInputStream()
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@property(nonatomic, readwrite, strong) NSData *buffer;
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@property(nonatomic, readwrite, assign) BufferState state;
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@end
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@implementation FIRMessagingCodedInputStream;
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- (instancetype)initWithData:(NSData *)data {
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self = [super init];
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if (self) {
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_buffer = data;
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_state.bytes = _buffer.bytes;
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_state.bufferSize = _buffer.length;
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}
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return self;
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}
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- (size_t)offset {
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return _state.bufferPos;
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}
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- (BOOL)readTag:(int8_t *)tag {
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return ReadRawByte(&_state, tag);
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}
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- (BOOL)readLength:(int32_t *)length {
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return ReadRawVarInt32(&_state, length);
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}
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- (NSData *)readDataWithLength:(uint32_t)length {
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if (!CheckSize(&_state, length)) {
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return nil;
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}
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const void *bytesToRead = _state.bytes + _state.bufferPos;
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NSData *result = [NSData dataWithBytes:bytesToRead length:length];
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_state.bufferPos += length;
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return result;
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}
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@end
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