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/******************************************************************************
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* swcomprs.cpp - code for class 'ZipCompress'- a driver class that provides
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* compression utilities. - using zlib
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/******************************************************************************
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* ZipCompress Constructor - Initializes data for instance of ZipCompress
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ZipCompress::ZipCompress() : SWCompress()
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// fprintf(stderr, "init compress\n");
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/******************************************************************************
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* ZipCompress Destructor - Cleans up instance of ZipCompress
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ZipCompress::~ZipCompress() {
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/******************************************************************************
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* ZipCompress::Encode - This function "encodes" the input stream into the
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* The GetChars() and SendChars() functions are
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* used to separate this method from the actual
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* NOTE: must set zlen for parent class to know length of
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void ZipCompress::Encode(void)
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ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen,
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const Bytef *source, uLong sourceLen));
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Compresses the source buffer into the destination buffer. sourceLen is
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the byte length of the source buffer. Upon entry, destLen is the total
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size of the destination buffer, which must be at least 0.1% larger than
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sourceLen plus 12 bytes. Upon exit, destLen is the actual size of the
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This function can be used to compress a whole file at once if the
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input file is mmap'ed.
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compress returns Z_OK if success, Z_MEM_ERROR if there was not
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enough memory, Z_BUF_ERROR if there was not enough room in the output
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direct = 0; // set direction needed by parent [Get|Send]Chars()
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char *buf = (char *)calloc(1, 1024);
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unsigned long chunklen;
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unsigned long len = 0;
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while((chunklen = GetChars(chunk, 1023))) {
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memcpy(chunkbuf, chunk, chunklen);
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else buf = (char *)realloc(buf, len + 1024);
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zlen = (long) (len*1.001)+15;
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char *zbuf = new char[zlen+1];
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//printf("Doing compress\n");
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if (compress((Bytef*)zbuf, &zlen, (const Bytef*)buf, len)!=Z_OK)
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printf("ERROR in compression\n");
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SendChars(zbuf, zlen);
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fprintf(stderr, "No buffer to compress\n");
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/******************************************************************************
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* ZipCompress::Decode - This function "decodes" the input stream into the
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* The GetChars() and SendChars() functions are
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* used to separate this method from the actual
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void ZipCompress::Decode(void)
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ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen,
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const Bytef *source, uLong sourceLen));
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Decompresses the source buffer into the destination buffer. sourceLen is
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the byte length of the source buffer. Upon entry, destLen is the total
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size of the destination buffer, which must be large enough to hold the
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entire uncompressed data. (The size of the uncompressed data must have
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been saved previously by the compressor and transmitted to the decompressor
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by some mechanism outside the scope of this compression library.)
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Upon exit, destLen is the actual size of the compressed buffer.
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This function can be used to decompress a whole file at once if the
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input file is mmap'ed.
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uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
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enough memory, Z_BUF_ERROR if there was not enough room in the output
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buffer, or Z_DATA_ERROR if the input data was corrupted.
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char *zbuf = (char *)calloc(1, 1024);
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char *chunkbuf = zbuf;
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unsigned long zlen = 0;
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while((chunklen = GetChars(chunk, 1023))) {
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memcpy(chunkbuf, chunk, chunklen);
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else zbuf = (char *)realloc(zbuf, zlen + 1024);
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chunkbuf = zbuf + zlen;
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//printf("Decoding complength{%ld} uncomp{%ld}\n", zlen, blen);
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unsigned long blen = zlen*20; // trust compression is less than 1000%
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char *buf = new char[blen];
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//printf("Doing decompress {%s}\n", zbuf);
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if (uncompress((Bytef*)buf, &blen, (Bytef*)zbuf, zlen) != Z_OK) {
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fprintf(stderr, "no room in outbuffer to during decompression. see zipcomp.cpp\n");
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SendChars(buf, blen);
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fprintf(stderr, "No buffer to decompress!\n");
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//printf("Finished decoding\n");
added
removed
src/modules/common/zipcomprs.cpp
