tdeflateblock.c - plan9port - [fork] Plan 9 from user space
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       ---
       tdeflateblock.c (787B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <flate.h>
            4 
            5 typedef struct Block        Block;
            6 
            7 struct Block
            8 {
            9         uchar        *pos;
           10         uchar        *limit;
           11 };
           12 
           13 static int
           14 blread(void *vb, void *buf, int n)
           15 {
           16         Block *b;
           17 
           18         b = vb;
           19         if(n > b->limit - b->pos)
           20                 n = b->limit - b->pos;
           21         memmove(buf, b->pos, n);
           22         b->pos += n;
           23         return n;
           24 }
           25 
           26 static int
           27 blwrite(void *vb, void *buf, int n)
           28 {
           29         Block *b;
           30 
           31         b = vb;
           32 
           33         if(n > b->limit - b->pos)
           34                 n = b->limit - b->pos;
           35         memmove(b->pos, buf, n);
           36         b->pos += n;
           37         return n;
           38 }
           39 
           40 int
           41 deflateblock(uchar *dst, int dsize, uchar *src, int ssize, int level, int debug)
           42 {
           43         Block bd, bs;
           44         int ok;
           45 
           46         bs.pos = src;
           47         bs.limit = src + ssize;
           48 
           49         bd.pos = dst;
           50         bd.limit = dst + dsize;
           51 
           52         ok = deflate(&bd, blwrite, &bs, blread, level, debug);
           53         if(ok != FlateOk)
           54                 return ok;
           55         return bd.pos - dst;
           56 }