Compression_test.cpp

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//***************************************************************************
//
// File:
//   $HeadURL$
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// Purpose:
//   [The purpose of this file]
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// Description:
//   [The set of functions, macros, etc. defined in the file]
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#include "../DataCompressionLayer.hpp"
#include "../ByteUtilities.hpp"

#include <cstdlib>
#include <cstdio>
#include <cassert>
#include <iostream>
using namespace std;

using namespace TraceviewerServer;

int inf(FILE *source, FILE *dest);

void compressionTest() {
        srand(3321);
        DataCompressionLayer compr;
        int size = BUFFER_SIZE/2 + 1000;
        for (int i = 0; i < size;i++) {
                compr.writeLong(rand());
        }
        compr.flush();
        cout << "Compressed " << size << " longs ("<< size*8<<" bytes). The compressed size is " << compr.getOutputLength() << endl;

        //Now check it using the official zlib sample code:
        FILE* tmp1 = tmpfile();
        fwrite(compr.getOutputBuffer(), sizeof(unsigned char), compr.getOutputLength(), tmp1);
        rewind(tmp1);
        FILE* tmp2 = tmpfile();
        inf(tmp1, tmp2);
        rewind(tmp2);
        srand(3321);
        for (int i = 0; i < size;i++) {
                long checkval = rand();
                char b[8];
                fread(&b[0], sizeof(char), 8, tmp2);
                long readval = ByteUtilities::readLong(b);
                assert(checkval == readval);
        }
        cout << "Compression correctness verified."<<endl;
}
/* Decompress from file source to file dest until stream ends or EOF.
 * inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
 * allocated for processing, Z_DATA_ERROR if the deflate data is
 * invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
 * the version of the library linked do not match, or Z_ERRNO if there
 * is an error reading or writing the files. */
int inf(FILE *source, FILE *dest)
{
#define CHUNK 16384
        int ret;
        unsigned have;
        z_stream strm;
        unsigned char in[CHUNK];
        unsigned char out[CHUNK];

        /* allocate inflate state */
        strm.zalloc = Z_NULL;
        strm.zfree = Z_NULL;
        strm.opaque = Z_NULL;
        strm.avail_in = 0;
        strm.next_in = Z_NULL;
        ret = inflateInit(&strm);
        if (ret != Z_OK)
                return ret;

        /* decompress until deflate stream ends or end of file */
        do {
                strm.avail_in = fread(in, 1, CHUNK, source);
                if (ferror(source)) {
                        (void)inflateEnd(&strm);
                        return Z_ERRNO;
                }
                if (strm.avail_in == 0)
                        break;
                strm.next_in = in;

                /* run inflate() on input until output buffer not full */
                do {
                        strm.avail_out = CHUNK;
                        strm.next_out = out;
                        ret = inflate(&strm, Z_NO_FLUSH);
                        assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
                        switch (ret) {
                        case Z_NEED_DICT:
                                ret = Z_DATA_ERROR;     /* and fall through */
                        case Z_DATA_ERROR:
                        case Z_MEM_ERROR:
                                (void)inflateEnd(&strm);
                                return ret;
                        }
                        have = CHUNK - strm.avail_out;
                        if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
                                (void)inflateEnd(&strm);
                                return Z_ERRNO;
                        }
                } while (strm.avail_out == 0);

                /* done when inflate() says it's done */
        } while (ret != Z_STREAM_END);

        /* clean up and return */
        (void)inflateEnd(&strm);
        return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
}