63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <openssl/objects.h>
|
||
|
|
#include <openssl/comp.h>
|
||
|
|
|
||
|
|
static int rle_compress_block(COMP_CTX *ctx, unsigned char *out,
|
||
|
|
unsigned int olen, unsigned char *in, unsigned int ilen);
|
||
|
|
static int rle_expand_block(COMP_CTX *ctx, unsigned char *out,
|
||
|
|
unsigned int olen, unsigned char *in, unsigned int ilen);
|
||
|
|
|
||
|
|
static COMP_METHOD rle_method={
|
||
|
|
NID_rle_compression,
|
||
|
|
LN_rle_compression,
|
||
|
|
NULL,
|
||
|
|
NULL,
|
||
|
|
rle_compress_block,
|
||
|
|
rle_expand_block,
|
||
|
|
NULL,
|
||
|
|
NULL,
|
||
|
|
};
|
||
|
|
|
||
|
|
COMP_METHOD *COMP_rle(void)
|
||
|
|
{
|
||
|
|
return(&rle_method);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int rle_compress_block(COMP_CTX *ctx, unsigned char *out,
|
||
|
|
unsigned int olen, unsigned char *in, unsigned int ilen)
|
||
|
|
{
|
||
|
|
/* int i; */
|
||
|
|
|
||
|
|
if (olen < (ilen+1))
|
||
|
|
{
|
||
|
|
/* ZZZZZZZZZZZZZZZZZZZZZZ */
|
||
|
|
return(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
*(out++)=0;
|
||
|
|
memcpy(out,in,ilen);
|
||
|
|
return(ilen+1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int rle_expand_block(COMP_CTX *ctx, unsigned char *out,
|
||
|
|
unsigned int olen, unsigned char *in, unsigned int ilen)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
if (olen < (ilen-1))
|
||
|
|
{
|
||
|
|
/* ZZZZZZZZZZZZZZZZZZZZZZ */
|
||
|
|
return(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
i= *(in++);
|
||
|
|
if (i == 0)
|
||
|
|
{
|
||
|
|
memcpy(out,in,ilen-1);
|
||
|
|
}
|
||
|
|
return(ilen-1);
|
||
|
|
}
|
||
|
|
|