1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LIBZIPARCHIVE_ENTRY_NAME_UTILS_INL_H_ 18 #define LIBZIPARCHIVE_ENTRY_NAME_UTILS_INL_H_ 19 20 #include <stddef.h> 21 #include <stdint.h> 22 23 // Check if |length| bytes at |entry_name| constitute a valid entry name. 24 // Entry names must be valid UTF-8 and must not contain '0'. IsValidEntryName(const uint8_t * entry_name,const size_t length)25inline bool IsValidEntryName(const uint8_t* entry_name, const size_t length) { 26 for (size_t i = 0; i < length; ++i) { 27 const uint8_t byte = entry_name[i]; 28 if (byte == 0) { 29 return false; 30 } else if ((byte & 0x80) == 0) { 31 // Single byte sequence. 32 continue; 33 } else if ((byte & 0xc0) == 0x80 || (byte & 0xfe) == 0xfe) { 34 // Invalid sequence. 35 return false; 36 } else { 37 // 2-5 byte sequences. 38 for (uint8_t first = (byte & 0x7f) << 1; first & 0x80; first = (first & 0x7f) << 1) { 39 ++i; 40 41 // Missing continuation byte.. 42 if (i == length) { 43 return false; 44 } 45 46 // Invalid continuation byte. 47 const uint8_t continuation_byte = entry_name[i]; 48 if ((continuation_byte & 0xc0) != 0x80) { 49 return false; 50 } 51 } 52 } 53 } 54 55 return true; 56 } 57 58 #endif // LIBZIPARCHIVE_ENTRY_NAME_UTILS_INL_H_ 59