Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |
| 23 | COMP_METHOD *COMP_rle(void) |
| 24 | { |
| 25 | return(&rle_method); |
| 26 | } |
| 27 | |
| 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 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 33 | if (olen < (ilen+1)) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 34 | { |
| 35 | /* ZZZZZZZZZZZZZZZZZZZZZZ */ |
| 36 | return(-1); |
| 37 | } |
| 38 | |
| 39 | *(out++)=0; |
| 40 | memcpy(out,in,ilen); |
| 41 | return(ilen+1); |
| 42 | } |
| 43 | |
| 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 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 49 | if (ilen == 0 || olen < (ilen-1)) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | } |