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	``` for f in $(find . \( -path ./.git -o -path ./tests/fuzz/corpora -o -path ./tests/regression/data-cache -o -path ./tests/regression/cache \) -prune -o -type f); do sed -i '/Copyright .* \(Yann Collet\)\|\(Meta Platforms\)/ s/Copyright .*/Copyright (c) Meta Platforms, Inc. and affiliates./' $f; done git checkout HEAD -- build/VS2010/libzstd-dll/libzstd-dll.rc build/VS2010/zstd/zstd.rc tests/test-license.py contrib/linux-kernel/test/include/linux/xxhash.h examples/streaming_compression_thread_pool.c lib/legacy/zstd_v0*.c lib/legacy/zstd_v0*.h nano ./programs/windres/zstd.rc nano ./build/VS2010/zstd/zstd.rc nano ./build/VS2010/libzstd-dll/libzstd-dll.rc ```
		
			
				
	
	
		
			101 lines
		
	
	
		
			3.6 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			101 lines
		
	
	
		
			3.6 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
/*
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 * Copyright (c) Meta Platforms, Inc. and affiliates.
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 * All rights reserved.
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 *
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 * This source code is licensed under both the BSD-style license (found in the
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 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
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 * in the COPYING file in the root directory of this source tree).
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 * You may select, at your option, one of the above-listed licenses.
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 */
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#include <stdio.h>     // fprintf
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#include <stdlib.h>    // free
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#include <zstd.h>      // presumes zstd library is installed
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#include "common.h"    // Helper functions, CHECK(), and CHECK_ZSTD()
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static void decompressFile_orDie(const char* fname)
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{
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    FILE* const fin  = fopen_orDie(fname, "rb");
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    size_t const buffInSize = ZSTD_DStreamInSize();
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    void*  const buffIn  = malloc_orDie(buffInSize);
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    FILE* const fout = stdout;
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    size_t const buffOutSize = ZSTD_DStreamOutSize();  /* Guarantee to successfully flush at least one complete compressed block in all circumstances. */
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    void*  const buffOut = malloc_orDie(buffOutSize);
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    ZSTD_DCtx* const dctx = ZSTD_createDCtx();
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    CHECK(dctx != NULL, "ZSTD_createDCtx() failed!");
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    /* This loop assumes that the input file is one or more concatenated zstd
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     * streams. This example won't work if there is trailing non-zstd data at
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     * the end, but streaming decompression in general handles this case.
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     * ZSTD_decompressStream() returns 0 exactly when the frame is completed,
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     * and doesn't consume input after the frame.
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     */
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    size_t const toRead = buffInSize;
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    size_t read;
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    size_t lastRet = 0;
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    int isEmpty = 1;
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    while ( (read = fread_orDie(buffIn, toRead, fin)) ) {
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        isEmpty = 0;
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        ZSTD_inBuffer input = { buffIn, read, 0 };
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        /* Given a valid frame, zstd won't consume the last byte of the frame
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         * until it has flushed all of the decompressed data of the frame.
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         * Therefore, instead of checking if the return code is 0, we can
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         * decompress just check if input.pos < input.size.
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         */
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        while (input.pos < input.size) {
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            ZSTD_outBuffer output = { buffOut, buffOutSize, 0 };
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            /* The return code is zero if the frame is complete, but there may
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             * be multiple frames concatenated together. Zstd will automatically
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             * reset the context when a frame is complete. Still, calling
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             * ZSTD_DCtx_reset() can be useful to reset the context to a clean
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             * state, for instance if the last decompression call returned an
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             * error.
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             */
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            size_t const ret = ZSTD_decompressStream(dctx, &output , &input);
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            CHECK_ZSTD(ret);
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            fwrite_orDie(buffOut, output.pos, fout);
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            lastRet = ret;
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        }
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    }
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    if (isEmpty) {
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        fprintf(stderr, "input is empty\n");
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        exit(1);
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    }
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    if (lastRet != 0) {
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        /* The last return value from ZSTD_decompressStream did not end on a
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         * frame, but we reached the end of the file! We assume this is an
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         * error, and the input was truncated.
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         */
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        fprintf(stderr, "EOF before end of stream: %zu\n", lastRet);
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        exit(1);
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    }
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    ZSTD_freeDCtx(dctx);
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    fclose_orDie(fin);
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    fclose_orDie(fout);
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    free(buffIn);
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    free(buffOut);
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}
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int main(int argc, const char** argv)
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{
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    const char* const exeName = argv[0];
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    if (argc!=2) {
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        fprintf(stderr, "wrong arguments\n");
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        fprintf(stderr, "usage:\n");
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        fprintf(stderr, "%s FILE\n", exeName);
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        return 1;
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    }
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    const char* const inFilename = argv[1];
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    decompressFile_orDie(inFilename);
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    return 0;
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}
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