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Update the test logic and the comments on the encoder.c module. (CVS 546)

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FossilOrigin-Name: 18c28519d973944756694b2c213bfef3153f4b1b
This commit is contained in:
drh
2002-04-25 23:06:47 +00:00
parent e8a49c12a6
commit f7bd5d75db
3 changed files with 29 additions and 20 deletions
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src/encode.c
+22 -13
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@@ -15,21 +15,21 @@
** data in an SQLite database. The code in this file is used by any other
** part of the SQLite library.
**
** $Id: encode.c,v 1.1 2002/04/25 11:45:42 drh Exp $
** $Id: encode.c,v 1.2 2002/04/25 23:06:47 drh Exp $
*/
#include "sqliteInt.h"
#include "encode.h"
/*
** Encode a binary buffer "in" of size n bytes so that it contains
** no instances of characters '\'' or '\000'. The output is
** null-terminated and can be used as a string value in an INSERT
** or UPDATE statement.
** or UPDATE statement. Use sqlite_decode_binary() to convert the
** string back into its original binary.
**
** The result is written into a preallocated output buffer "out".
** "out" must be able to hold at least 2 + (n+255)*3/256 + n bytes.
** "out" must be able to hold at least (256*n + 1262)/253 bytes.
** In other words, the output will be expanded by as much as 3
** bytes for every 256 bytes of input plus 2 bytes of fixed overhead.
** bytes for every 253 bytes of input plus 2 bytes of fixed overhead.
** (This is approximately 2 + 1.019*n or about a 2% size increase.)
*/
void sqlite_encode_binary(const unsigned char *in, int n, unsigned char *out){
int i, j, e, m;
@@ -107,16 +107,25 @@ int sqlite_decode_binary(const unsigned char *in, unsigned char *out){
*/
int main(int argc, char **argv){
int i, j, n, m;
unsigned char in[20000];
unsigned char out[30000];
unsigned char in[30000];
unsigned char out[33000];
for(i=0; i<10000; i++){
for(i=0; i<sizeof(in); i++){
printf("Test %d: ", i+1);
n = rand() % sizeof(in);
for(j=0; j<n; j++) in[j] = rand() & 0xff;
n = rand() % (i+1);
if( i%100==0 ){
int k;
for(j=k=0; j<n; j++){
/* if( k==0 || k=='\'' ) k++; */
in[j] = k;
k = (k+1)&0xff;
}
}else{
for(j=0; j<n; j++) in[j] = rand() & 0xff;
}
sqlite_encode_binary(in, n, out);
printf("size %d->%d ", n, strlen(out)+1);
m = 2 + (n+255)*3/256 + n;
m = (256*n + 1262)/253;
printf("size %d->%d (max %d)", n, strlen(out)+1, m);
if( strlen(out)+1>m ){
printf(" ERROR output too big\n");
exit(1);