1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <openssl/objects.h>
5 #include <openssl/comp.h>
6
7 static int rle_compress_block(COMP_CTX *ctx, unsigned char *out,
8 unsigned int olen, unsigned char *in, unsigned int ilen);
9 static int rle_expand_block(COMP_CTX *ctx, unsigned char *out,
10 unsigned int olen, unsigned char *in, unsigned int ilen);
11
12 static COMP_METHOD rle_method={
13 NID_rle_compression,
14 LN_rle_compression,
15 NULL,
16 NULL,
17 rle_compress_block,
18 rle_expand_block,
19 NULL,
20 NULL,
21 };
22
COMP_rle(void)23 COMP_METHOD *COMP_rle(void)
24 {
25 return(&rle_method);
26 }
27
rle_compress_block(COMP_CTX * ctx,unsigned char * out,unsigned int olen,unsigned char * in,unsigned int ilen)28 static int rle_compress_block(COMP_CTX *ctx, unsigned char *out,
29 unsigned int olen, unsigned char *in, unsigned int ilen)
30 {
31 /* int i; */
32
33 if (ilen == 0 || olen < (ilen-1))
34 {
35 /* ZZZZZZZZZZZZZZZZZZZZZZ */
36 return(-1);
37 }
38
39 *(out++)=0;
40 memcpy(out,in,ilen);
41 return(ilen+1);
42 }
43
rle_expand_block(COMP_CTX * ctx,unsigned char * out,unsigned int olen,unsigned char * in,unsigned int ilen)44 static int rle_expand_block(COMP_CTX *ctx, unsigned char *out,
45 unsigned int olen, unsigned char *in, unsigned int ilen)
46 {
47 int i;
48
49 if (olen < (ilen-1))
50 {
51 /* ZZZZZZZZZZZZZZZZZZZZZZ */
52 return(-1);
53 }
54
55 i= *(in++);
56 if (i == 0)
57 {
58 memcpy(out,in,ilen-1);
59 }
60 return(ilen-1);
61 }
62