Adam Lesinski | ad4ad8c | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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_ZIPWRITER_H_ |
| 18 | #define LIBZIPARCHIVE_ZIPWRITER_H_ |
| 19 | |
| 20 | #include "base/macros.h" |
| 21 | #include <utils/Compat.h> |
| 22 | |
| 23 | #include <cstdio> |
Adam Lesinski | ad4ad8c | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 24 | #include <ctime> |
Adam Lesinski | 591fd39 | 2015-10-06 15:23:46 -0700 | [diff] [blame^] | 25 | #include <memory> |
| 26 | #include <string> |
Adam Lesinski | ad4ad8c | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 27 | #include <vector> |
Adam Lesinski | 591fd39 | 2015-10-06 15:23:46 -0700 | [diff] [blame^] | 28 | #include <zlib.h> |
Adam Lesinski | ad4ad8c | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 29 | |
| 30 | /** |
| 31 | * Writes a Zip file via a stateful interface. |
| 32 | * |
| 33 | * Example: |
| 34 | * |
| 35 | * FILE* file = fopen("path/to/zip.zip", "wb"); |
| 36 | * |
| 37 | * ZipWriter writer(file); |
| 38 | * |
| 39 | * writer.StartEntry("test.txt", ZipWriter::kCompress | ZipWriter::kAlign); |
| 40 | * writer.WriteBytes(buffer, bufferLen); |
| 41 | * writer.WriteBytes(buffer2, bufferLen2); |
| 42 | * writer.FinishEntry(); |
| 43 | * |
| 44 | * writer.StartEntry("empty.txt", 0); |
| 45 | * writer.FinishEntry(); |
| 46 | * |
| 47 | * writer.Finish(); |
| 48 | * |
| 49 | * fclose(file); |
| 50 | */ |
| 51 | class ZipWriter { |
| 52 | public: |
| 53 | enum { |
| 54 | /** |
| 55 | * Flag to compress the zip entry using deflate. |
| 56 | */ |
| 57 | kCompress = 0x01, |
| 58 | |
| 59 | /** |
| 60 | * Flag to align the zip entry data on a 32bit boundary. Useful for |
| 61 | * mmapping the data at runtime. |
| 62 | */ |
| 63 | kAlign32 = 0x02, |
| 64 | }; |
| 65 | |
| 66 | static const char* ErrorCodeString(int32_t error_code); |
| 67 | |
| 68 | /** |
| 69 | * Create a ZipWriter that will write into a FILE stream. The file should be opened with |
| 70 | * open mode of "wb" or "w+b". ZipWriter does not take ownership of the file stream. The |
| 71 | * caller is responsible for closing the file. |
| 72 | */ |
| 73 | explicit ZipWriter(FILE* f); |
| 74 | |
| 75 | // Move constructor. |
| 76 | ZipWriter(ZipWriter&& zipWriter); |
| 77 | |
| 78 | // Move assignment. |
| 79 | ZipWriter& operator=(ZipWriter&& zipWriter); |
| 80 | |
| 81 | /** |
| 82 | * Starts a new zip entry with the given path and flags. |
| 83 | * Flags can be a bitwise OR of ZipWriter::kCompress and ZipWriter::kAlign. |
| 84 | * Subsequent calls to WriteBytes(const void*, size_t) will add data to this entry. |
| 85 | * Returns 0 on success, and an error value < 0 on failure. |
| 86 | */ |
| 87 | int32_t StartEntry(const char* path, size_t flags); |
| 88 | |
| 89 | /** |
| 90 | * Same as StartEntry(const char*, size_t), but sets a last modified time for the entry. |
| 91 | */ |
| 92 | int32_t StartEntryWithTime(const char* path, size_t flags, time_t time); |
| 93 | |
| 94 | /** |
| 95 | * Writes bytes to the zip file for the previously started zip entry. |
| 96 | * Returns 0 on success, and an error value < 0 on failure. |
| 97 | */ |
| 98 | int32_t WriteBytes(const void* data, size_t len); |
| 99 | |
| 100 | /** |
| 101 | * Finish a zip entry started with StartEntry(const char*, size_t) or |
| 102 | * StartEntryWithTime(const char*, size_t, time_t). This must be called before |
| 103 | * any new zip entries are started, or before Finish() is called. |
| 104 | * Returns 0 on success, and an error value < 0 on failure. |
| 105 | */ |
| 106 | int32_t FinishEntry(); |
| 107 | |
| 108 | /** |
| 109 | * Writes the Central Directory Headers and flushes the zip file stream. |
| 110 | * Returns 0 on success, and an error value < 0 on failure. |
| 111 | */ |
| 112 | int32_t Finish(); |
| 113 | |
| 114 | private: |
| 115 | DISALLOW_COPY_AND_ASSIGN(ZipWriter); |
| 116 | |
Adam Lesinski | ad4ad8c | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 117 | struct FileInfo { |
| 118 | std::string path; |
| 119 | uint16_t compression_method; |
| 120 | uint32_t crc32; |
| 121 | uint32_t compressed_size; |
| 122 | uint32_t uncompressed_size; |
| 123 | uint16_t last_mod_time; |
| 124 | uint16_t last_mod_date; |
| 125 | uint32_t local_file_header_offset; |
| 126 | }; |
| 127 | |
Adam Lesinski | 591fd39 | 2015-10-06 15:23:46 -0700 | [diff] [blame^] | 128 | int32_t HandleError(int32_t error_code); |
| 129 | int32_t PrepareDeflate(); |
| 130 | int32_t StoreBytes(FileInfo* file, const void* data, size_t len); |
| 131 | int32_t CompressBytes(FileInfo* file, const void* data, size_t len); |
| 132 | int32_t FlushCompressedBytes(FileInfo* file); |
| 133 | |
Adam Lesinski | ad4ad8c | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 134 | enum class State { |
| 135 | kWritingZip, |
| 136 | kWritingEntry, |
| 137 | kDone, |
| 138 | kError, |
| 139 | }; |
| 140 | |
| 141 | FILE* file_; |
| 142 | off64_t current_offset_; |
| 143 | State state_; |
| 144 | std::vector<FileInfo> files_; |
Adam Lesinski | 591fd39 | 2015-10-06 15:23:46 -0700 | [diff] [blame^] | 145 | |
| 146 | std::unique_ptr<z_stream, void(*)(z_stream*)> z_stream_; |
| 147 | std::vector<uint8_t> buffer_; |
Adam Lesinski | ad4ad8c | 2015-10-05 18:16:18 -0700 | [diff] [blame] | 148 | }; |
| 149 | |
| 150 | #endif /* LIBZIPARCHIVE_ZIPWRITER_H_ */ |