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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
*/
/*
* A simple demo that sums up all the bytes in the file in parallel using
* seekable decompression and the zstd thread pool
*/
#include <stdlib.h> // malloc, exit
#include <stdio.h> // fprintf, perror, feof
#include <string.h> // strerror
#include <errno.h> // errno
#define ZSTD_STATIC_LINKING_ONLY
#include <zstd.h> // presumes zstd library is installed
#include <zstd_errors.h>
#if defined(WIN32) || defined(_WIN32)
# include <windows.h>
# define SLEEP(x) Sleep(x)
#else
# include <unistd.h>
# define SLEEP(x) usleep(x * 1000)
#endif
#include "pool.h" // use zstd thread pool for demo
#include "../zstd_seekable.h"
#define MIN(a, b) ((a) < (b) ? (a) : (b))
static void* malloc_orDie(size_t size)
{
void* const buff = malloc(size);
if (buff) return buff;
/* error */
perror("malloc");
exit(1);
}
static void* realloc_orDie(void* ptr, size_t size)
{
ptr = realloc(ptr, size);
if (ptr) return ptr;
/* error */
perror("realloc");
exit(1);
}
static FILE* fopen_orDie(const char *filename, const char *instruction)
{
FILE* const inFile = fopen(filename, instruction);
if (inFile) return inFile;
/* error */
perror(filename);
exit(3);
}
static size_t fread_orDie(void* buffer, size_t sizeToRead, FILE* file)
{
size_t const readSize = fread(buffer, 1, sizeToRead, file);
if (readSize == sizeToRead) return readSize; /* good */
if (feof(file)) return readSize; /* good, reached end of file */
/* error */
perror("fread");
exit(4);
}
static size_t fwrite_orDie(const void* buffer, size_t sizeToWrite, FILE* file)
{
size_t const writtenSize = fwrite(buffer, 1, sizeToWrite, file);
if (writtenSize == sizeToWrite) return sizeToWrite; /* good */
/* error */
perror("fwrite");
exit(5);
}
static size_t fclose_orDie(FILE* file)
{
if (!fclose(file)) return 0;
/* error */
perror("fclose");
exit(6);
}
static void fseek_orDie(FILE* file, long int offset, int origin) {
if (!fseek(file, offset, origin)) {
if (!fflush(file)) return;
}
/* error */
perror("fseek");
exit(7);
}
struct sum_job {
const char* fname;
unsigned long long sum;
unsigned frameNb;
int done;
};
static void sumFrame(void* opaque)
{
struct sum_job* job = (struct sum_job*)opaque;
job->done = 0;
FILE* const fin = fopen_orDie(job->fname, "rb");
ZSTD_seekable* const seekable = ZSTD_seekable_create();
if (seekable==NULL) { fprintf(stderr, "ZSTD_seekable_create() error \n"); exit(10); }
size_t const initResult = ZSTD_seekable_initFile(seekable, fin);
if (ZSTD_isError(initResult)) { fprintf(stderr, "ZSTD_seekable_init() error : %s \n", ZSTD_getErrorName(initResult)); exit(11); }
size_t const frameSize = ZSTD_seekable_getFrameDecompressedSize(seekable, job->frameNb);
unsigned char* data = malloc_orDie(frameSize);
size_t result = ZSTD_seekable_decompressFrame(seekable, data, frameSize, job->frameNb);
if (ZSTD_isError(result)) { fprintf(stderr, "ZSTD_seekable_decompressFrame() error : %s \n", ZSTD_getErrorName(result)); exit(12); }
unsigned long long sum = 0;
size_t i;
for (i = 0; i < frameSize; i++) {
sum += data[i];
}
job->sum = sum;
job->done = 1;
fclose(fin);
ZSTD_seekable_free(seekable);
free(data);
}
static void sumFile_orDie(const char* fname, int nbThreads)
{
POOL_ctx* pool = POOL_create(nbThreads, nbThreads);
if (pool == NULL) { fprintf(stderr, "POOL_create() error \n"); exit(9); }
FILE* const fin = fopen_orDie(fname, "rb");
ZSTD_seekable* const seekable = ZSTD_seekable_create();
if (seekable==NULL) { fprintf(stderr, "ZSTD_seekable_create() error \n"); exit(10); }
size_t const initResult = ZSTD_seekable_initFile(seekable, fin);
if (ZSTD_isError(initResult)) { fprintf(stderr, "ZSTD_seekable_init() error : %s \n", ZSTD_getErrorName(initResult)); exit(11); }
unsigned const numFrames = ZSTD_seekable_getNumFrames(seekable);
struct sum_job* jobs = (struct sum_job*)malloc(numFrames * sizeof(struct sum_job));
unsigned fnb;
for (fnb = 0; fnb < numFrames; fnb++) {
jobs[fnb] = (struct sum_job){ fname, 0, fnb, 0 };
POOL_add(pool, sumFrame, &jobs[fnb]);
}
unsigned long long total = 0;
for (fnb = 0; fnb < numFrames; fnb++) {
while (!jobs[fnb].done) SLEEP(5); /* wake up every 5 milliseconds to check */
total += jobs[fnb].sum;
}
printf("Sum: %llu\n", total);
POOL_free(pool);
ZSTD_seekable_free(seekable);
fclose(fin);
free(jobs);
}
int main(int argc, const char** argv)
{
const char* const exeName = argv[0];
if (argc!=3) {
fprintf(stderr, "wrong arguments\n");
fprintf(stderr, "usage:\n");
fprintf(stderr, "%s FILE NB_THREADS\n", exeName);
return 1;
}
{
const char* const inFilename = argv[1];
int const nbThreads = atoi(argv[2]);
sumFile_orDie(inFilename, nbThreads);
}
return 0;
}
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