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https://github.com/facebook/zstd.git
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Rename and remove unneeded files
This commit is contained in:
Stella Lau
260
contrib/long_distance_matching/main.c
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260
contrib/long_distance_matching/main.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <zstd.h>
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#include <fcntl.h>
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#include "ldm.h"
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#include "zstd.h"
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//#define DECOMPRESS_AND_VERIFY
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/* Compress file given by fname and output to oname.
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* Returns 0 if successful, error code otherwise.
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*
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* This might seg fault if the compressed size is > the decompress
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* size due to the mmapping and output file size allocated to be the input size
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* The compress function should check before writing or buffer writes.
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*/
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static int compress(const char *fname, const char *oname) {
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int fdin, fdout;
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struct stat statbuf;
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char *src, *dst;
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size_t maxCompressedSize, compressedSize;
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struct timeval tv1, tv2;
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double timeTaken;
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/* Open the input file. */
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if ((fdin = open(fname, O_RDONLY)) < 0) {
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perror("Error in file opening");
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return 1;
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}
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/* Open the output file. */
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if ((fdout = open(oname, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600)) < 0) {
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perror("Can't create output file");
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return 1;
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}
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/* Find the size of the input file. */
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if (fstat (fdin, &statbuf) < 0) {
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perror("Fstat error");
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return 1;
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}
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maxCompressedSize = (statbuf.st_size + LDM_HEADER_SIZE);
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// Handle case where compressed size is > decompressed size.
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// The compress function should check before writing or buffer writes.
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maxCompressedSize += statbuf.st_size / 255;
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ftruncate(fdout, maxCompressedSize);
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/* mmap the input file. */
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if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, fdin, 0))
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== (caddr_t) - 1) {
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perror("mmap error for input");
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return 1;
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}
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/* mmap the output file */
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if ((dst = mmap(0, maxCompressedSize, PROT_READ | PROT_WRITE,
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MAP_SHARED, fdout, 0)) == (caddr_t) - 1) {
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perror("mmap error for output");
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return 1;
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}
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#ifdef TEST
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LDM_test((const BYTE *)src);
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#endif
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gettimeofday(&tv1, NULL);
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compressedSize = LDM_HEADER_SIZE +
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LDM_compress(src, statbuf.st_size,
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dst + LDM_HEADER_SIZE, maxCompressedSize);
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gettimeofday(&tv2, NULL);
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// Write compress and decompress size to header
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// TODO: should depend on LDM_DECOMPRESS_SIZE write32
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LDM_writeHeader(dst, compressedSize, statbuf.st_size);
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// Truncate file to compressedSize.
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ftruncate(fdout, compressedSize);
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printf("%25s : %10lu -> %10lu - %s \n", fname,
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(size_t)statbuf.st_size, (size_t)compressedSize, oname);
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printf("Compression ratio: %.2fx --- %.1f%%\n",
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(double)statbuf.st_size / (double)compressedSize,
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(double)compressedSize / (double)(statbuf.st_size) * 100.0);
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timeTaken = (double) (tv2.tv_usec - tv1.tv_usec) / 1000000 +
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(double) (tv2.tv_sec - tv1.tv_sec),
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printf("Total compress time = %.3f seconds, Average scanning speed: %.3f MB/s\n",
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timeTaken,
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((double)statbuf.st_size / (double) (1 << 20)) / timeTaken);
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// Close files.
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close(fdin);
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close(fdout);
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return 0;
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}
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#ifdef DECOMPRESS
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/* Decompress file compressed using LDM_compress.
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* The input file should have the LDM_HEADER followed by payload.
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* Returns 0 if succesful, and an error code otherwise.
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*/
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static int decompress(const char *fname, const char *oname) {
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int fdin, fdout;
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struct stat statbuf;
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char *src, *dst;
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U64 compressedSize, decompressedSize;
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size_t outSize;
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/* Open the input file. */
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if ((fdin = open(fname, O_RDONLY)) < 0) {
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perror("Error in file opening");
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return 1;
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}
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/* Open the output file. */
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if ((fdout = open(oname, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600)) < 0) {
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perror("Can't create output file");
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return 1;
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}
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/* Find the size of the input file. */
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if (fstat (fdin, &statbuf) < 0) {
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perror("Fstat error");
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return 1;
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}
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/* mmap the input file. */
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if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, fdin, 0))
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== (caddr_t) - 1) {
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perror("mmap error for input");
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return 1;
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}
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/* Read the header. */
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LDM_readHeader(src, &compressedSize, &decompressedSize);
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ftruncate(fdout, decompressedSize);
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/* mmap the output file */
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if ((dst = mmap(0, decompressedSize, PROT_READ | PROT_WRITE,
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MAP_SHARED, fdout, 0)) == (caddr_t) - 1) {
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perror("mmap error for output");
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return 1;
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}
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outSize = LDM_decompress(
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src + LDM_HEADER_SIZE, statbuf.st_size - LDM_HEADER_SIZE,
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dst, decompressedSize);
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printf("Ret size out: %zu\n", outSize);
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close(fdin);
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close(fdout);
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return 0;
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}
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/* Compare two files.
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* Returns 0 iff they are the same.
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*/
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static int compare(FILE *fp0, FILE *fp1) {
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int result = 0;
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while (result == 0) {
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char b0[1024];
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char b1[1024];
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const size_t r0 = fread(b0, 1, sizeof(b0), fp0);
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const size_t r1 = fread(b1, 1, sizeof(b1), fp1);
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result = (int)r0 - (int)r1;
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if (0 == r0 || 0 == r1) break;
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if (0 == result) result = memcmp(b0, b1, r0);
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}
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return result;
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}
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/* Verify the input file is the same as the decompressed file. */
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static void verify(const char *inpFilename, const char *decFilename) {
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FILE *inpFp = fopen(inpFilename, "rb");
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FILE *decFp = fopen(decFilename, "rb");
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printf("verify : %s <-> %s\n", inpFilename, decFilename);
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{
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const int cmp = compare(inpFp, decFp);
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if(0 == cmp) {
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printf("verify : OK\n");
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} else {
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printf("verify : NG\n");
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}
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}
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fclose(decFp);
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fclose(inpFp);
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}
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#endif
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int main(int argc, const char *argv[]) {
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const char * const exeName = argv[0];
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char inpFilename[256] = { 0 };
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char ldmFilename[256] = { 0 };
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char decFilename[256] = { 0 };
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if (argc < 2) {
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printf("Wrong arguments\n");
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printf("Usage:\n");
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printf("%s FILE\n", exeName);
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return 1;
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}
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snprintf(inpFilename, 256, "%s", argv[1]);
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snprintf(ldmFilename, 256, "%s.ldm", argv[1]);
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snprintf(decFilename, 256, "%s.ldm.dec", argv[1]);
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printf("inp = [%s]\n", inpFilename);
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printf("ldm = [%s]\n", ldmFilename);
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printf("dec = [%s]\n", decFilename);
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/* Compress */
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{
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if (compress(inpFilename, ldmFilename)) {
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printf("Compress error");
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return 1;
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}
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}
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#ifdef DECOMPRESS_AND_VERIFY
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/* Decompress */
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{
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struct timeval tv1, tv2;
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gettimeofday(&tv1, NULL);
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if (decompress(ldmFilename, decFilename)) {
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printf("Decompress error");
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return 1;
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}
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gettimeofday(&tv2, NULL);
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printf("Total decompress time = %f seconds\n",
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(double) (tv2.tv_usec - tv1.tv_usec) / 1000000 +
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(double) (tv2.tv_sec - tv1.tv_sec));
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}
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/* verify */
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verify(inpFilename, decFilename);
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#endif
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return 0;
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}
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