Switch to mmapping files
Stella Lau
parent
88f3d8641e
commit
8aa34a7608
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@ -10,18 +10,23 @@
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# This Makefile presumes libzstd is installed, using `sudo make install`
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LDFLAGS += -lzstd
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.PHONY: default all clean
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default: all
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all: main
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all: main main-ldm
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main : ldm.c main.c
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$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
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main-ldm : ldm.c main-ldm.c
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$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
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clean:
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@rm -f core *.o tmp* result* *.ldm *.ldm.dec \
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main
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main main-ldm
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@echo Cleaning completed
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@ -0,0 +1,411 @@
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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/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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#define BUF_SIZE 16*1024 // Block size
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#define LDM_HEADER_SIZE 8
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#define DEBUG
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#if 0
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static size_t compress_file(FILE *in, FILE *out, size_t *size_in,
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size_t *size_out) {
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char *src, *buf = NULL;
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size_t r = 1;
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size_t size, n, k, count_in = 0, count_out = 0, offset, frame_size = 0;
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src = malloc(BUF_SIZE);
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if (!src) {
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printf("Not enough memory\n");
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goto cleanup;
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}
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size = BUF_SIZE + LDM_HEADER_SIZE;
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buf = malloc(size);
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if (!buf) {
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printf("Not enough memory\n");
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goto cleanup;
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}
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for (;;) {
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k = fread(src, 1, BUF_SIZE, in);
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if (k == 0)
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break;
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count_in += k;
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n = LDM_compress(src, buf, k, BUF_SIZE);
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// n = k;
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// offset += n;
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offset = k;
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count_out += k;
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// k = fwrite(src, 1, offset, out);
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k = fwrite(buf, 1, offset, out);
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if (k < offset) {
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if (ferror(out))
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printf("Write failed\n");
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else
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printf("Short write\n");
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goto cleanup;
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}
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}
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*size_in = count_in;
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*size_out = count_out;
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r = 0;
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cleanup:
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free(src);
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free(buf);
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return r;
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}
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static size_t decompress_file(FILE *in, FILE *out) {
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void *src = malloc(BUF_SIZE);
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void *dst = NULL;
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size_t dst_capacity = BUF_SIZE;
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size_t ret = 1;
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size_t bytes_written = 0;
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if (!src) {
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perror("decompress_file(src)");
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goto cleanup;
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}
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while (ret != 0) {
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/* Load more input */
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size_t src_size = fread(src, 1, BUF_SIZE, in);
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void *src_ptr = src;
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void *src_end = src_ptr + src_size;
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if (src_size == 0 || ferror(in)) {
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printf("(TODO): Decompress: not enough input or error reading file\n");
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//TODO
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ret = 0;
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goto cleanup;
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}
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/* Allocate destination buffer if it hasn't been allocated already */
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if (!dst) {
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dst = malloc(dst_capacity);
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if (!dst) {
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perror("decompress_file(dst)");
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goto cleanup;
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}
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}
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// TODO
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/* Decompress:
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* Continue while there is more input to read.
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*/
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while (src_ptr != src_end && ret != 0) {
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// size_t dst_size = src_size;
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size_t dst_size = LDM_decompress(src, dst, src_size, dst_capacity);
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size_t written = fwrite(dst, 1, dst_size, out);
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// printf("Writing %zu bytes\n", dst_size);
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bytes_written += dst_size;
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if (written != dst_size) {
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printf("Decompress: Failed to write to file\n");
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goto cleanup;
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}
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src_ptr += src_size;
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src_size = src_end - src_ptr;
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}
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/* Update input */
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}
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printf("Wrote %zu bytes\n", bytes_written);
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cleanup:
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free(src);
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free(dst);
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return ret;
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}
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#endif
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static size_t 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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/* 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 size of 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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/* go to the location corresponding to the last byte */
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if (lseek(fdout, statbuf.st_size - 1, SEEK_SET) == -1) {
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perror("lseek error");
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return 1;
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}
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/* write a dummy byte at the last location */
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if (write(fdout, "", 1) != 1) {
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perror("write 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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/* mmap the output file */
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if ((dst = mmap(0, statbuf.st_size, 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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/* Copy input file to output file */
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// memcpy(dst, src, statbuf.st_size);
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size_t size_out = ZSTD_compress(dst, statbuf.st_size,
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src, statbuf.st_size, 1);
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printf("%25s : %6u -> %7u - %s (%.1f%%)\n", fname,
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(unsigned)statbuf.st_size, (unsigned)size_out, oname,
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(double)size_out / (statbuf.st_size) * 100);
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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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static size_t 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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/* 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 size of 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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/* go to the location corresponding to the last byte */
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if (lseek(fdout, statbuf.st_size - 1, SEEK_SET) == -1) {
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perror("lseek error");
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return 1;
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}
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/* write a dummy byte at the last location */
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if (write(fdout, "", 1) != 1) {
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perror("write 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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/* mmap the output file */
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if ((dst = mmap(0, statbuf.st_size, 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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/* Copy input file to output file */
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// memcpy(dst, src, statbuf.st_size);
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size_t size_out = ZSTD_decompress(dst, statbuf.st_size,
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src, statbuf.st_size);
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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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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) {
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break;
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}
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if (0 == result) {
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result = memcmp(b0, b1, r0);
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}
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}
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return result;
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}
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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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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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fclose(decFp);
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fclose(inpFp);
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}
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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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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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/* decompress */
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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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/* verify */
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verify(inpFilename, decFilename);
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}
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#if 0
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int main2(int argc, char *argv[]) {
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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("Please specify input filename\n");
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return 0;
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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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FILE *inpFp = fopen(inpFilename, "rb");
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FILE *outFp = fopen(ldmFilename, "wb");
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size_t sizeIn = 0;
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size_t sizeOut = 0;
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size_t ret;
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printf("compress : %s -> %s\n", inpFilename, ldmFilename);
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ret = compress_file(inpFp, outFp, &sizeIn, &sizeOut);
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if (ret) {
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printf("compress : failed with code %zu\n", ret);
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return ret;
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}
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printf("%s: %zu → %zu bytes, %.1f%%\n",
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inpFilename, sizeIn, sizeOut,
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(double)sizeOut / sizeIn * 100);
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printf("compress : done\n");
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fclose(outFp);
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fclose(inpFp);
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}
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/* decompress */
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{
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FILE *inpFp = fopen(ldmFilename, "rb");
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FILE *outFp = fopen(decFilename, "wb");
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size_t ret;
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printf("decompress : %s -> %s\n", ldmFilename, decFilename);
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ret = decompress_file(inpFp, outFp);
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if (ret) {
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printf("decompress : failed with code %zu\n", ret);
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return ret;
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}
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printf("decompress : done\n");
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fclose(outFp);
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fclose(inpFp);
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}
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/* verify */
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{
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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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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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fclose(decFp);
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fclose(inpFp);
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}
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return 0;
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}
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#endif
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