62 lines
1.4 KiB
C
62 lines
1.4 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 (ilen == 0 || olen < (ilen - 1)) {
|
|
/* ZZZZZZZZZZZZZZZZZZZZZZ */
|
|
return (-1);
|
|
}
|
|
|
|
i = *(in++);
|
|
if (i == 0) {
|
|
memcpy(out, in, ilen - 1);
|
|
}
|
|
return (ilen - 1);
|
|
}
|