| #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 (ilen == 0 || 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); |
| } |