LzmaCompress 例子
时间: 2023-08-25 07:04:26 浏览: 42
以下是一个使用LzmaCompress函数进行压缩和解压缩的完整示例:
```c++
#include <stdio.h>
#include <stdlib.h>
#include <lzma.h>
int main() {
char* input = "Hello World";
size_t input_size = strlen(input);
size_t output_size = input_size * 2;
char* output = (char*)malloc(output_size);
// 压缩数据
lzma_stream strm = LZMA_STREAM_INIT;
lzma_options_lzma opt_lzma2;
lzma_lzma_preset(&opt_lzma2, 9);
lzma_filter filters[2] = { { .id = LZMA_FILTER_LZMA2, .options = &opt_lzma2 }, { .id = LZMA_VLI_UNKNOWN } };
lzma_ret ret = lzma_stream_encoder(&strm, filters, LZMA_CHECK_CRC64);
if (ret != LZMA_OK) {
printf("lzmastream init error: %d\n", ret);
return 1;
}
strm.next_in = (const uint8_t*)input;
strm.avail_in = input_size;
strm.next_out = (uint8_t*)output;
strm.avail_out = output_size;
ret = lzma_code(&strm, LZMA_FINISH);
if (ret != LZMA_STREAM_END) {
printf("lzma compression error: %d\n", ret);
return 1;
}
size_t compressed_size = strm.total_out;
lzma_end(&strm);
// 输出压缩后的数据
printf("Compressed data: ");
for (size_t i = 0; i < compressed_size; i++) {
printf("%02X ", output[i]);
}
printf("\n");
// 解压缩数据
strm = LZMA_STREAM_INIT;
ret = lzma_stream_decoder(&strm, UINT64_MAX, 0);
if (ret != LZMA_OK) {
printf("lzmastream init error: %d\n", ret);
return 1;
}
strm.next_in = (const uint8_t*)output;
strm.avail_in = compressed_size;
strm.next_out = (uint8_t*)input;
strm.avail_out = input_size;
ret = lzma_code(&strm, LZMA_FINISH);
if (ret != LZMA_STREAM_END) {
printf("lzma decompression error: %d\n", ret);
return 1;
}
size_t decompressed_size = strm.total_out;
lzma_end(&strm);
// 输出解压缩后的数据
printf("Decompressed data: %s\n", input);
free(output);
return 0;
}
```
在上面的示例中,我们使用LZMA算法对一个字符串“Hello World”进行压缩和解压缩,并将压缩前和解压缩后的数据打印出来。需要注意的是,在解压缩时我们需要重新初始化lzma_stream对象并调用lzma_stream_decoder函数来初始化LZMA解压器。
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