LZW.zip_lzw类_visualc资源-CSDN文库

共32个文件

orig：5个

cpp：3个

obj：3个

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193 浏览量 2022-09-22 23:05:21 上传评论收藏 449KB ZIP 举报

LZW（Lempel-Ziv-Welch）压缩算法是一种数据压缩方法，广泛应用于文本、图像和其他类型的数据。它基于字典编码的概念，通过查找和组合已编码的字符串来创建新的编码，以此来减少数据的存储空间。在C++中实现LZW算法，通常会涉及两个关键类：字典类和编码/解码类。字典类的设计是LZW算法的核心。它负责存储已编码的字符串以及它们对应的编码。初始时，字典包含一些基本字符，如ASCII字符集。随着编码过程的进行，字典会动态地添加新条目。字典类通常会有以下功能： 1. 初始化：设置字典的初始状态，通常包括插入基本字符。 2. 插入：当遇到新的字符串组合时，将这个组合插入到字典中并分配一个新的编码。 3. 查找：根据输入的编码返回对应的字符串。 4. 更新：在编码过程中，字典需要不断更新以适应新的编码需求。编码/解码类则负责处理实际的编码和解码过程。编码过程中，输入的数据流被分割成更小的单元，然后查找这些单元在字典中的对应编码。如果找不到匹配项，就将当前字符串与前一个字符组合，直到找到匹配项或达到最大长度。找到匹配项后，输出其编码，并将新字符串添加到字典中。解码过程则相反，它接收编码流，根据字典恢复原始数据。在Visual C++环境下，实现LZW算法可能需要利用STL（Standard Template Library）中的容器，如`std::map`或`std::unordered_map`作为字典数据结构，因为它们提供了高效的查找和插入操作。同时，`std::vector`可以用来存储编码序列。此外，可能还需要使用I/O流库（iostream）处理文件读写。在"2个类文件"中，第一个类可能是字典类，包含上述提到的方法。第二个类可能是编码解码类，包含`encode`和`decode`函数，分别用于对原始数据进行编码和对编码后的数据进行解码。这两个类之间可能会通过指针或引用进行交互，以便于共享字典实例。在实现过程中，需要注意一些关键点： 1. 确保字典大小的限制，因为LZW编码可能导致字典迅速膨胀，超出可接受范围。 2. 处理编码溢出问题，比如当编码值超过可用的编码空间时，需要重新初始化字典或采用其他策略。 3. 对于编码和解码过程中的边界条件，如空字符串或单个字符的处理，需要特别小心。 4. 文件读写时的缓冲区管理，以优化性能和内存使用。 LZW算法的C++实现涉及到数据结构的选择、编码逻辑的实现以及I/O操作的处理，是一个很好的练习项目，可以帮助开发者深入理解数据压缩原理以及C++编程。通过这两个类文件，你可以学习到如何设计和实现复杂算法，并将其应用于实际的文件压缩和解压缩操作。

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收起资源包目录

LZW.zip （32个子文件）

LZW

LZW.ncb 859KB

LZW.sln 875B

LZW.suo 15KB

LZW

CLZWCompressFile.h 593B

LZW.vcproj.xiejunqi.谢军奇.user 1KB

input.xml 4KB

CLZWCompressFile.h.orig 1KB

out.xml 42KB

CLZWCompressFile.cpp 4KB

CLZWImpl.h.orig 958B

CLZWImpl.cpp 7KB

CLZWCompressFile.cpp.orig 4KB

test.txt 9KB

CLZWImpl.h 860B

CLZWImpl.cpp.orig 8KB

a.txt 42KB

Test.cpp 1008B

Test.cpp.orig 1KB

LZW.vcproj 4KB

Debug

Test.obj 11KB

CLZWCompressFile.obj 23KB

BuildLog.htm 12KB

LZW.exe.intermediate.manifest 621B

vc90.pdb 68KB

vc90.idb 83KB

mt.dep 65B

LZW.exe.embed.manifest 663B

CLZWImpl.obj 23KB

LZW.exe.embed.manifest.res 728B

Debug

LZW.pdb 443KB

LZW.exe 46KB

LZW.ilk 360KB

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