diff options
Diffstat (limited to 'src/zstd/contrib/seekable_format/examples')
6 files changed, 725 insertions, 0 deletions
diff --git a/src/zstd/contrib/seekable_format/examples/.gitignore b/src/zstd/contrib/seekable_format/examples/.gitignore new file mode 100644 index 00000000..df2f9ab0 --- /dev/null +++ b/src/zstd/contrib/seekable_format/examples/.gitignore @@ -0,0 +1,4 @@ +seekable_compression +seekable_decompression +parallel_processing +parallel_compression diff --git a/src/zstd/contrib/seekable_format/examples/Makefile b/src/zstd/contrib/seekable_format/examples/Makefile new file mode 100644 index 00000000..1847aa7e --- /dev/null +++ b/src/zstd/contrib/seekable_format/examples/Makefile @@ -0,0 +1,42 @@ +# ################################################################ +# Copyright (c) 2017-present, Facebook, Inc. +# 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). +# ################################################################ + +# This Makefile presumes libzstd is built, using `make` in / or /lib/ + +LDFLAGS += ../../../lib/libzstd.a +CPPFLAGS += -I../ -I../../../lib -I../../../lib/common + +CFLAGS ?= -O3 +CFLAGS += -g + +SEEKABLE_OBJS = ../zstdseek_compress.c ../zstdseek_decompress.c + +.PHONY: default all clean test + +default: all + +all: seekable_compression seekable_decompression parallel_processing + +seekable_compression : seekable_compression.c $(SEEKABLE_OBJS) + $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ + +seekable_decompression : seekable_decompression.c $(SEEKABLE_OBJS) + $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ + +parallel_processing : parallel_processing.c $(SEEKABLE_OBJS) + $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ -pthread + +parallel_compression : parallel_compression.c $(SEEKABLE_OBJS) + $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ -pthread + +clean: + @rm -f core *.o tmp* result* *.zst \ + seekable_compression seekable_decompression \ + parallel_processing parallel_compression + @echo Cleaning completed diff --git a/src/zstd/contrib/seekable_format/examples/parallel_compression.c b/src/zstd/contrib/seekable_format/examples/parallel_compression.c new file mode 100644 index 00000000..69644d2b --- /dev/null +++ b/src/zstd/contrib/seekable_format/examples/parallel_compression.c @@ -0,0 +1,215 @@ +/* + * Copyright (c) 2017-present, Facebook, Inc. + * 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). + */ + +#include <stdlib.h> // malloc, free, exit, atoi +#include <stdio.h> // fprintf, perror, feof, fopen, etc. +#include <string.h> // strlen, memset, strcat +#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 + +#define XXH_NAMESPACE ZSTD_ +#include "xxhash.h" + +#include "pool.h" // use zstd thread pool for demo + +#include "zstd_seekable.h" + +static void* malloc_orDie(size_t size) +{ + void* const buff = malloc(size); + if (buff) return buff; + /* error */ + perror("malloc:"); + 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); +} + +static long int ftell_orDie(FILE* file) +{ + long int off = ftell(file); + if (off != -1) return off; + /* error */ + perror("ftell"); + exit(8); +} + +struct job { + const void* src; + size_t srcSize; + void* dst; + size_t dstSize; + + unsigned checksum; + + int compressionLevel; + int done; +}; + +static void compressFrame(void* opaque) +{ + struct job* job = opaque; + + job->checksum = XXH64(job->src, job->srcSize, 0); + + size_t ret = ZSTD_compress(job->dst, job->dstSize, job->src, job->srcSize, job->compressionLevel); + if (ZSTD_isError(ret)) { + fprintf(stderr, "ZSTD_compress() error : %s \n", ZSTD_getErrorName(ret)); + exit(20); + } + + job->dstSize = ret; + job->done = 1; +} + +static void compressFile_orDie(const char* fname, const char* outName, int cLevel, unsigned frameSize, 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"); + FILE* const fout = fopen_orDie(outName, "wb"); + + if (ZSTD_compressBound(frameSize) > 0xFFFFFFFFU) { fprintf(stderr, "Frame size too large \n"); exit(10); } + unsigned dstSize = ZSTD_compressBound(frameSize); + + + fseek_orDie(fin, 0, SEEK_END); + long int length = ftell_orDie(fin); + fseek_orDie(fin, 0, SEEK_SET); + + size_t numFrames = (length + frameSize - 1) / frameSize; + + struct job* jobs = malloc_orDie(sizeof(struct job) * numFrames); + + size_t i; + for(i = 0; i < numFrames; i++) { + void* in = malloc_orDie(frameSize); + void* out = malloc_orDie(dstSize); + + size_t inSize = fread_orDie(in, frameSize, fin); + + jobs[i].src = in; + jobs[i].srcSize = inSize; + jobs[i].dst = out; + jobs[i].dstSize = dstSize; + jobs[i].compressionLevel = cLevel; + jobs[i].done = 0; + POOL_add(pool, compressFrame, &jobs[i]); + } + + ZSTD_frameLog* fl = ZSTD_seekable_createFrameLog(1); + if (fl == NULL) { fprintf(stderr, "ZSTD_seekable_createFrameLog() failed \n"); exit(11); } + for (i = 0; i < numFrames; i++) { + while (!jobs[i].done) SLEEP(5); /* wake up every 5 milliseconds to check */ + fwrite_orDie(jobs[i].dst, jobs[i].dstSize, fout); + free((void*)jobs[i].src); + free(jobs[i].dst); + + size_t ret = ZSTD_seekable_logFrame(fl, jobs[i].dstSize, jobs[i].srcSize, jobs[i].checksum); + if (ZSTD_isError(ret)) { fprintf(stderr, "ZSTD_seekable_logFrame() error : %s \n", ZSTD_getErrorName(ret)); } + } + + { unsigned char seekTableBuff[1024]; + ZSTD_outBuffer out = {seekTableBuff, 1024, 0}; + while (ZSTD_seekable_writeSeekTable(fl, &out) != 0) { + fwrite_orDie(seekTableBuff, out.pos, fout); + out.pos = 0; + } + fwrite_orDie(seekTableBuff, out.pos, fout); + } + + ZSTD_seekable_freeFrameLog(fl); + free(jobs); + fclose_orDie(fout); + fclose_orDie(fin); +} + +static const char* createOutFilename_orDie(const char* filename) +{ + size_t const inL = strlen(filename); + size_t const outL = inL + 5; + void* outSpace = malloc_orDie(outL); + memset(outSpace, 0, outL); + strcat(outSpace, filename); + strcat(outSpace, ".zst"); + return (const char*)outSpace; +} + +int main(int argc, const char** argv) { + const char* const exeName = argv[0]; + if (argc!=4) { + printf("wrong arguments\n"); + printf("usage:\n"); + printf("%s FILE FRAME_SIZE NB_THREADS\n", exeName); + return 1; + } + + { const char* const inFileName = argv[1]; + unsigned const frameSize = (unsigned)atoi(argv[2]); + int const nbThreads = atoi(argv[3]); + + const char* const outFileName = createOutFilename_orDie(inFileName); + compressFile_orDie(inFileName, outFileName, 5, frameSize, nbThreads); + } + + return 0; +} diff --git a/src/zstd/contrib/seekable_format/examples/parallel_processing.c b/src/zstd/contrib/seekable_format/examples/parallel_processing.c new file mode 100644 index 00000000..da347763 --- /dev/null +++ b/src/zstd/contrib/seekable_format/examples/parallel_processing.c @@ -0,0 +1,194 @@ +/* + * Copyright (c) 2017-present, Facebook, Inc. + * 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); } + + size_t const numFrames = ZSTD_seekable_getNumFrames(seekable); + struct sum_job* jobs = (struct sum_job*)malloc(numFrames * sizeof(struct sum_job)); + + size_t i; + for (i = 0; i < numFrames; i++) { + jobs[i] = (struct sum_job){ fname, 0, i, 0 }; + POOL_add(pool, sumFrame, &jobs[i]); + } + + unsigned long long total = 0; + + for (i = 0; i < numFrames; i++) { + while (!jobs[i].done) SLEEP(5); /* wake up every 5 milliseconds to check */ + total += jobs[i].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; +} diff --git a/src/zstd/contrib/seekable_format/examples/seekable_compression.c b/src/zstd/contrib/seekable_format/examples/seekable_compression.c new file mode 100644 index 00000000..9485bf26 --- /dev/null +++ b/src/zstd/contrib/seekable_format/examples/seekable_compression.c @@ -0,0 +1,132 @@ +/* + * Copyright (c) 2017-present, Facebook, Inc. + * 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). + */ + +#include <stdlib.h> // malloc, free, exit, atoi +#include <stdio.h> // fprintf, perror, feof, fopen, etc. +#include <string.h> // strlen, memset, strcat +#define ZSTD_STATIC_LINKING_ONLY +#include <zstd.h> // presumes zstd library is installed + +#include "zstd_seekable.h" + +static void* malloc_orDie(size_t size) +{ + void* const buff = malloc(size); + if (buff) return buff; + /* error */ + perror("malloc:"); + 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 compressFile_orDie(const char* fname, const char* outName, int cLevel, unsigned frameSize) +{ + FILE* const fin = fopen_orDie(fname, "rb"); + FILE* const fout = fopen_orDie(outName, "wb"); + size_t const buffInSize = ZSTD_CStreamInSize(); /* can always read one full block */ + void* const buffIn = malloc_orDie(buffInSize); + size_t const buffOutSize = ZSTD_CStreamOutSize(); /* can always flush a full block */ + void* const buffOut = malloc_orDie(buffOutSize); + + ZSTD_seekable_CStream* const cstream = ZSTD_seekable_createCStream(); + if (cstream==NULL) { fprintf(stderr, "ZSTD_seekable_createCStream() error \n"); exit(10); } + size_t const initResult = ZSTD_seekable_initCStream(cstream, cLevel, 1, frameSize); + if (ZSTD_isError(initResult)) { fprintf(stderr, "ZSTD_seekable_initCStream() error : %s \n", ZSTD_getErrorName(initResult)); exit(11); } + + size_t read, toRead = buffInSize; + while( (read = fread_orDie(buffIn, toRead, fin)) ) { + ZSTD_inBuffer input = { buffIn, read, 0 }; + while (input.pos < input.size) { + ZSTD_outBuffer output = { buffOut, buffOutSize, 0 }; + toRead = ZSTD_seekable_compressStream(cstream, &output , &input); /* toRead is guaranteed to be <= ZSTD_CStreamInSize() */ + if (ZSTD_isError(toRead)) { fprintf(stderr, "ZSTD_seekable_compressStream() error : %s \n", ZSTD_getErrorName(toRead)); exit(12); } + if (toRead > buffInSize) toRead = buffInSize; /* Safely handle case when `buffInSize` is manually changed to a value < ZSTD_CStreamInSize()*/ + fwrite_orDie(buffOut, output.pos, fout); + } + } + + while (1) { + ZSTD_outBuffer output = { buffOut, buffOutSize, 0 }; + size_t const remainingToFlush = ZSTD_seekable_endStream(cstream, &output); /* close stream */ + if (ZSTD_isError(remainingToFlush)) { fprintf(stderr, "ZSTD_seekable_endStream() error : %s \n", ZSTD_getErrorName(remainingToFlush)); exit(13); } + fwrite_orDie(buffOut, output.pos, fout); + if (!remainingToFlush) break; + } + + ZSTD_seekable_freeCStream(cstream); + fclose_orDie(fout); + fclose_orDie(fin); + free(buffIn); + free(buffOut); +} + +static const char* createOutFilename_orDie(const char* filename) +{ + size_t const inL = strlen(filename); + size_t const outL = inL + 5; + void* outSpace = malloc_orDie(outL); + memset(outSpace, 0, outL); + strcat(outSpace, filename); + strcat(outSpace, ".zst"); + return (const char*)outSpace; +} + +int main(int argc, const char** argv) { + const char* const exeName = argv[0]; + if (argc!=3) { + printf("wrong arguments\n"); + printf("usage:\n"); + printf("%s FILE FRAME_SIZE\n", exeName); + return 1; + } + + { const char* const inFileName = argv[1]; + unsigned const frameSize = (unsigned)atoi(argv[2]); + + const char* const outFileName = createOutFilename_orDie(inFileName); + compressFile_orDie(inFileName, outFileName, 5, frameSize); + } + + return 0; +} diff --git a/src/zstd/contrib/seekable_format/examples/seekable_decompression.c b/src/zstd/contrib/seekable_format/examples/seekable_decompression.c new file mode 100644 index 00000000..9cd23292 --- /dev/null +++ b/src/zstd/contrib/seekable_format/examples/seekable_decompression.c @@ -0,0 +1,138 @@ +/* + * Copyright (c) 2017-present, Facebook, Inc. + * 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). + */ + + +#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> + +#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); +} + + +static void decompressFile_orDie(const char* fname, unsigned startOffset, unsigned endOffset) +{ + FILE* const fin = fopen_orDie(fname, "rb"); + FILE* const fout = stdout; + size_t const buffOutSize = ZSTD_DStreamOutSize(); /* Guarantee to successfully flush at least one complete compressed block in all circumstances. */ + void* const buffOut = malloc_orDie(buffOutSize); + + 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); } + + while (startOffset < endOffset) { + size_t const result = ZSTD_seekable_decompress(seekable, buffOut, MIN(endOffset - startOffset, buffOutSize), startOffset); + + if (ZSTD_isError(result)) { + fprintf(stderr, "ZSTD_seekable_decompress() error : %s \n", + ZSTD_getErrorName(result)); + exit(12); + } + fwrite_orDie(buffOut, result, fout); + startOffset += result; + } + + ZSTD_seekable_free(seekable); + fclose_orDie(fin); + fclose_orDie(fout); + free(buffOut); +} + + +int main(int argc, const char** argv) +{ + const char* const exeName = argv[0]; + + if (argc!=4) { + fprintf(stderr, "wrong arguments\n"); + fprintf(stderr, "usage:\n"); + fprintf(stderr, "%s FILE START END\n", exeName); + return 1; + } + + { + const char* const inFilename = argv[1]; + unsigned const startOffset = (unsigned) atoi(argv[2]); + unsigned const endOffset = (unsigned) atoi(argv[3]); + decompressFile_orDie(inFilename, startOffset, endOffset); + } + + return 0; +} |