嵌入式大雜燴周記 | 第 13 期

測(cè)試?yán)樱?

把字符串"12345678901234567890123456789012345678901234567890"進(jìn)行l(wèi)z4壓縮，再解壓，再把解壓之后的內(nèi)容打印出來(lái)。

編寫測(cè)試代碼：

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// 微信公眾號(hào)：嵌入式大雜燴 #include  #include  #include  #include  #include  #include "lz4.h" long long get_sys_time_us(void) { long long time_us = 0; struct timeval sys_current_time; gettimeofday(&sys_current_time, NULL);
    time_us = (long long)sys_current_time.tv_sec*1000000 + sys_current_time.tv_usec; return time_us;
} int main(int arc, char *argv[]) { // 壓縮 char *src0 = "12345678901234567890123456789012345678901234567890"; char dst0[64] = {0}; int src0_size = strlen(src0) + 1; int max_dst0_size = sizeof(dst0); int dst0_compress_size = 0; printf("before compress = %s, bytes = %d\n", src0, src0_size); if (src0_size < max_dst0_size) { long long compress_start_time = get_sys_time_us();
        dst0_compress_size = LZ4_compress_default(src0, dst0, src0_size, max_dst0_size); long long compress_end_time = get_sys_time_us(); printf("after compress = %s\n", dst0); printf("compress_time = %lld us\n", compress_end_time - compress_start_time);
    } else { printf("compress error! src0_size >= max_dst0_size\n");
    } // 解壓 char src1[64] = {0}; char dst1[64] = {0}; int compressed_size = dst0_compress_size; int max_decompressed_size = sizeof(dst1); int dst1_decompress_size = 0; if (dst0_compress_size < max_decompressed_size) { memcpy(src1, dst0, dst0_compress_size); printf("before decompress = %s\n", src1);
    } else { printf("dst0_compress_size >= max_decompressed_size\n");
    } if (compressed_size < max_decompressed_size) { long long decompress_start_time = get_sys_time_us();
        dst1_decompress_size = LZ4_decompress_safe(src1, dst1, compressed_size, max_decompressed_size); long long decompress_end_time = get_sys_time_us(); printf("after decompress = %s, bytes = %d\n", dst1, dst1_decompress_size); printf("decompress_time = %lld us\n", decompress_end_time - decompress_start_time);
    } else { printf("decompress error! compressed_size >= max_decompressed_size\n");
    } return 0;
}

gcc -o lz4_test lz4_test.c -Llz4_x86_lib/lib -Ilz4_x86_lib/include -llz4
./lz4_test