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70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
#include <arpa/inet.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include "../bread.h"
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#define FNAME "bread-test.data"
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#define RECORDS 2
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void test (int seed) {
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srandom(seed);
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unlink(FNAME);
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int i;
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char buf[RECORDS][100];
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int sizes[RECORDS];
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int sizesn[RECORDS];
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size_t off = 0;
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{
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int fd = creat(FNAME, 0777);
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assert(fd>=0);
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for (i=0; i<RECORDS; i++) {
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sizes[i] = random()%100;
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sizesn[i] = htonl(sizes[i]);
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int j;
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for (j=0; j<sizes[i]; j++) {
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buf[i][j]=random();
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}
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int r = write(fd, buf[i], sizes[i]);
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assert(r==sizes[i]);
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off+=r;
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r = write(fd, &sizesn[i], 4);
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assert(r==4);
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off+=4;
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}
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{ int r=close(fd); assert(r==0); }
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}
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int fd = open(FNAME, O_RDONLY); assert(fd>=0);
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// Now read it all backward
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BREAD br = create_bread_from_fd_initialize_at(fd, off, 50);
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while (bread_has_more(br)) {
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assert(i>0);
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i--;
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int sizen;
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{ int r = bread_backwards(br, &sizen, 4); assert(r==4); }
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int sizeh=ntohl(sizen);
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assert(sizeh==sizes[i]);
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assert(0<=sizeh && sizeh<100);
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{
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char rbuf[100];
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int r = bread_backwards(br, rbuf,sizeh);
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assert(r==sizeh);
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assert(memcmp(rbuf, &buf[i][0], sizes[i])==0);
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}
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}
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assert(i==0);
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{ int r=close_bread_without_closing_fd(br); assert(r==0); }
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{ int r=close(fd); assert(r==0); }
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unlink(FNAME);
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}
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int main (int argc __attribute__((__unused__)), char *argv[] __attribute__((__unused__))) {
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int i;
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for (i=0; i<10; i++) test(i);
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return 0;
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}
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