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#undef NDEBUG
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h> /* for chdir(2) */
#include <string.h>
#include <dirent.h>
#include <assert.h>
#include <errno.h>
#include <T.h>
enum expectation {
EXP_OK, /* Encoding/decoding must succeed */
EXP_BROKEN, /* Decoding must fail */
EXP_RECLESS, /* Reconstruction is allowed to yield less data */
EXP_DIFFERENT, /* Reconstruction will yield different encoding */
};
static unsigned char buf[4096];
static int buf_offset;
static int
_buf_writer(const void *buffer, size_t size, void *app_key) {
unsigned char *b, *bend;
(void)app_key;
assert(buf_offset + size < sizeof(buf));
memcpy(buf + buf_offset, buffer, size);
b = buf + buf_offset;
bend = b + size;
printf("=> [");
for(; b < bend; b++)
printf(" %02X", *b);
printf("]:%zd\n", size);
buf_offset += size;
return 0;
}
static int
save_object(T_t *st) {
asn_enc_rval_t rval; /* Return value */
buf_offset = 0;
rval = der_encode(&asn_DEF_T, st, _buf_writer, 0);
if (rval.encoded == -1) {
fprintf(stderr,
"Cannot encode %s: %s\n",
rval.failed_type->name, strerror(errno));
assert(rval.encoded != -1);
return -1; /* JIC */
}
fprintf(stderr, "SAVED OBJECT IN SIZE %d\n", buf_offset);
return 0;
}
static T_t *
load_object(enum expectation expectation, unsigned char *fbuf, size_t size) {
asn_dec_rval_t rval;
T_t *st = 0;
int csize;
fprintf(stderr, "LOADING OBJECT OF SIZE %d\n", (int)size);
/* Perform multiple iterations with multiple chunks sizes */
for(csize = 1; csize < 20; csize += 1) {
int fbuf_offset = 0;
int fbuf_left = size;
int fbuf_chunk = csize;
if(st) asn_DEF_T.free_struct(&asn_DEF_T, st, 0);
st = 0;
do {
fprintf(stderr, "Decoding from %d with %d (left %d)\n",
fbuf_offset, fbuf_chunk, fbuf_left);
rval = ber_decode(0, &asn_DEF_T, (void **)&st,
fbuf + fbuf_offset,
fbuf_chunk < fbuf_left
? fbuf_chunk : fbuf_left);
fbuf_offset += rval.consumed;
fbuf_left -= rval.consumed;
if(rval.code == RC_WMORE)
fbuf_chunk += 1; /* Give little more */
else
fbuf_chunk = csize; /* Back off */
} while(fbuf_left && rval.code == RC_WMORE);
if(expectation != EXP_BROKEN) {
assert(rval.code == RC_OK);
assert(fbuf_offset == (ssize_t)size);
} else {
assert(rval.code != RC_OK);
fprintf(stderr, "Failed, but this was expected\n");
asn_DEF_T.free_struct(&asn_DEF_T, st, 0);
st = 0; /* ignore leak for now */
}
}
if(st) asn_fprint(stderr, &asn_DEF_T, st);
return st;
}
static void
process_data(enum expectation expectation, unsigned char *fbuf, ssize_t size) {
T_t *st;
int ret;
st = load_object(expectation, fbuf, size);
if(!st) return;
ret = save_object(st);
assert(buf_offset < (ssize_t)sizeof(buf));
assert(ret == 0);
switch(expectation) {
case EXP_RECLESS:
assert(buf_offset > 0 && buf_offset < size);
assert(memcmp(buf + 2, fbuf + 2, buf_offset - 2) == 0);
break;
case EXP_DIFFERENT:
assert(buf_offset > 0 && buf_offset < size);
break;
case EXP_BROKEN:
assert(buf_offset != size
|| memcmp(buf, fbuf, buf_offset));
break;
case EXP_OK:
assert(buf_offset == (ssize_t)size);
assert(memcmp(buf, fbuf, buf_offset) == 0);
break;
}
asn_DEF_T.free_struct(&asn_DEF_T, st, 0);
}
/*
* Decode the .der files and try to regenerate them.
*/
static int
process(const char *fname) {
unsigned char fbuf[4096];
char *ext = strrchr(fname, '.');
enum expectation expectation;
int ret;
int rd;
FILE *fp;
if(ext == 0 || strcmp(ext, ".ber"))
return 0;
switch(ext[-1]) {
case 'B': /* The file is intentionally broken */
expectation = EXP_BROKEN; break;
case 'D': /* Reconstructing should yield different data */
expectation = EXP_DIFFERENT; break;
case 'L': /* Extensions are present */
expectation = EXP_RECLESS; break;
default:
expectation = EXP_OK; break;
}
fprintf(stderr, "\nProcessing file [../%s]\n", fname);
ret = chdir("../data-62");
assert(ret == 0);
fp = fopen(fname, "r");
ret = chdir("../test-check-62");
assert(ret == 0);
assert(fp);
rd = fread(fbuf, 1, sizeof(fbuf), fp);
fclose(fp);
assert(rd < (ssize_t)sizeof(fbuf)); /* expect small files */
process_data(expectation, fbuf, rd);
return 1;
}
int
main() {
DIR *dir;
struct dirent *dent;
int processed_files = 0;
char *str;
dir = opendir("../data-62");
assert(dir);
str = getenv("DATA_62_FILE");
if(str && strncmp(str, "data-62-", 8) == 0)
process(str);
while((dent = readdir(dir))) {
if(strncmp(dent->d_name, "data-62-", 8) == 0)
if(process(dent->d_name))
processed_files++;
}
assert(processed_files);
closedir(dir);
return 0;
}
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