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root |
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#include "EXTERN.h" |
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#include "perl.h" |
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#include "XSUB.h" |
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/* try to be compatible with older perls */ |
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/* SvPV_nolen() macro first defined in 5.005_55 */ |
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/* this is slow, not threadsafe, but works */ |
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#include "patchlevel.h" |
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#if (PATCHLEVEL == 4) || ((PATCHLEVEL == 5) && (SUBVERSION < 55)) |
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static STRLEN nolen_na; |
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# define SvPV_nolen(sv) SvPV ((sv), nolen_na) |
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#endif |
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#include "lzv1/lzv1.c" |
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MODULE = Compress::LZV1 PACKAGE = Compress::LZV1 |
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SV * |
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compress(data) |
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SV * data |
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PROTOTYPE: $ |
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CODE: |
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{ |
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STRLEN usize, csize; |
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void *src = SvPV(data, usize); |
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unsigned char *dst; |
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unsigned short heap[HSIZ]; /* need not be initialized */ |
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if (usize) |
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{ |
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RETVAL = NEWSV (0, usize + 1); |
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SvPOK_only (RETVAL); |
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dst = (unsigned char *)SvPV_nolen (RETVAL); |
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/* compress */ |
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csize = wLZV1 ((uch *)src, (uch *)(dst + 4), heap, usize, usize - 5); |
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if (csize) |
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{ |
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dst[0] = 'L'; /* compressed flag */ |
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dst[1] = usize >> 16; |
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dst[2] = usize >> 8; |
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dst[3] = usize >> 0; |
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SvCUR_set (RETVAL, csize + 4); |
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} |
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else |
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{ |
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dst[0] = 'U'; |
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Move ((void *)src, (void *)(dst + 1), usize, unsigned char); |
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SvCUR_set (RETVAL, usize + 1); |
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} |
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} |
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else |
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RETVAL = newSVpv ("", 0); |
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} |
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OUTPUT: |
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RETVAL |
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SV * |
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decompress(data) |
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SV * data |
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PROTOTYPE: $ |
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CODE: |
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{ |
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STRLEN usize, csize; |
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unsigned char *src = (unsigned char *)SvPV(data, csize); |
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void *dst; |
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if (csize) |
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{ |
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switch (src[0]) { |
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case 'U': |
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usize = csize - 1; |
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RETVAL = NEWSV (0, usize); |
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SvPOK_only (RETVAL); |
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dst = SvPV_nolen (RETVAL); |
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Move ((void *)(src + 1), (void *)dst, usize, unsigned char); |
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break; |
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case 'L': |
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usize = (src[1] << 16) |
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| (src[2] << 8) |
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| (src[3] << 0); |
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RETVAL = NEWSV (0, usize); |
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SvPOK_only (RETVAL); |
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dst = SvPV_nolen (RETVAL); |
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if (rLZV1 ((uch *)(src + 4), (uch *)dst, csize - 4, usize) != usize) |
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croak ("LZV1: compressed data corrupted (2)"); |
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break; |
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default: |
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croak ("LZV1: compressed data corrupted (1)"); |
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} |
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SvCUR_set (RETVAL, usize); |
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} |
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else |
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RETVAL = newSVpvn ("", 0); |
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} |
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OUTPUT: |
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RETVAL |
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