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 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 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
