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#include "../include/extract_buffer.h"
#include "../include/extract_alloc.h"
#include "mem.h"
#include "memento.h"
#include "outf.h"
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
static int rand_int(int max)
/* Returns random int from 0..max-1. */
{
return (int) (rand() / (RAND_MAX+1.0) * max);
}
/* Support for an extract_buffer_t that reads from / writes to a fixed block of
memory, with a fn_cache() that returns a randomly-sized cache each time it is
called, and read/write functions that do random short reads and writes. */
typedef struct
{
extract_alloc_t* alloc;
char* data;
size_t bytes; /* Size of data[]. */
size_t pos; /* Current position in data[]. */
char cache[137];
int num_calls_cache;
int num_calls_read;
int num_calls_write;
} mem_t;
static int s_read(void* handle, void* destination, size_t bytes, size_t* o_actual)
/* Does a randomised short read. */
{
mem_t* r = handle;
size_t n = 91;
assert(bytes > 0);
r->num_calls_read += 1;
assert(r->pos <= r->bytes);
if (n > bytes) n = bytes;
if (n > r->bytes - r->pos) n = r->bytes - r->pos;
if (n) n = rand_int((int) n-1) + 1;
memcpy(destination, r->data + r->pos, n);
r->pos += n;
*o_actual = n;
return 0;
}
static int s_read_cache(void* handle, void** o_cache, size_t* o_numbytes)
/* Returns a cache with randomised size. */
{
mem_t* r = handle;
int n;
r->num_calls_cache += 1;
*o_cache = r->cache;
n = (int) (r->bytes - r->pos);
if (n > (int) sizeof(r->cache)) n = sizeof(r->cache);
if (n) n = rand_int( n - 1) + 1;
memcpy(r->cache, r->data + r->pos, n);
r->pos += n;
*o_cache = r->cache;
*o_numbytes = n;
return 0;
}
static void s_read_buffer_close(void* handle)
{
mem_t* r = handle;
extract_free(r->alloc, &r->data);
}
static void s_create_read_buffer(extract_alloc_t* alloc, int bytes, mem_t* r, extract_buffer_t** o_buffer)
/* Creates extract_buffer_t that reads from randomised data using randomised
short reads and cache with randomised sizes. */
{
int i;
int e;
if (extract_malloc(alloc, &r->data, bytes)) abort();
for (i=0; i<bytes; ++i) {
r->data[i] = (char) rand();
}
r->alloc = alloc;
r->bytes = bytes;
r->pos = 0;
r->num_calls_cache = 0;
r->num_calls_read = 0;
r->num_calls_write = 0;
e = extract_buffer_open(alloc, r, s_read, NULL /*write*/, s_read_cache, s_read_buffer_close, o_buffer);
assert(!e);
}
static void test_read(void)
{
/* Create read buffer with randomised content. */
int len = 12345;
mem_t r;
char* out_buffer;
int out_pos;
int its;
int e;
extract_buffer_t* buffer;
s_create_read_buffer(NULL /*alloc*/, len, &r, &buffer);
/* Repeatedly read from read-buffer until we get EOF, and check we read the
original content. */
if (extract_malloc(r.alloc, &out_buffer, len)) abort();
out_pos = 0;
for (its=0;; ++its) {
size_t actual;
int n = rand_int(120)+1;
int e = extract_buffer_read(buffer, out_buffer + out_pos, n, &actual);
out_pos += (int) actual;
assert(out_pos == (int) extract_buffer_pos(buffer));
if (e == 1) break;
assert(!e);
assert(!memcmp(out_buffer, r.data, out_pos));
}
assert(out_pos == len);
assert(!memcmp(out_buffer, r.data, len));
outf("its=%i num_calls_read=%i num_calls_write=%i num_calls_cache=%i",
its, r.num_calls_read, r.num_calls_write, r.num_calls_cache);
extract_free(r.alloc, &out_buffer);
out_buffer = NULL;
e = extract_buffer_close(&buffer);
assert(!e);
outf("Read test passed.\n");
}
static int s_write(void* handle, const void* source, size_t bytes, size_t* o_actual)
/* Does a randomised short write. */
{
mem_t* r = handle;
int n = 61;
r->num_calls_write += 1;
if (n > (int) bytes) n = (int) bytes;
if (n > (int) (r->bytes - r->pos)) n = (int) (r->bytes - r->pos);
assert(n);
n = rand_int((int) n-1) + 1;
memcpy(r->data + r->pos, source, n);
r->data[r->bytes] = 0;
r->pos += n;
*o_actual = n;
return 0;
}
static int s_write_cache(void* handle, void** o_cache, size_t* o_numbytes)
/* Returns a cache with randomised size. */
{
mem_t* r = handle;
int n;
r->num_calls_cache += 1;
assert(r->bytes >= r->pos);
*o_cache = r->cache;
n = (int) (r->bytes - r->pos);
if (n > (int) sizeof(r->cache)) n = sizeof(r->cache);
if (n) n = rand_int( n - 1) + 1;
*o_cache = r->cache;
*o_numbytes = n;
/* We will return a zero-length cache at EOF. */
return 0;
}
static void s_write_buffer_close(void* handle)
{
mem_t* mem = handle;
outf("*** freeing mem->data=%p", mem->data);
extract_free(mem->alloc, &mem->data);
}
static void s_create_write_buffer(extract_alloc_t* alloc, size_t bytes, mem_t* r, extract_buffer_t** o_buffer)
/* Creates extract_buffer_t that reads from randomised data using randomised
short reads and cache with randomised sizes. */
{
int e;
if (extract_malloc(alloc, &r->data, bytes+1)) abort();
extract_bzero(r->data, bytes);
r->alloc = alloc;
r->bytes = bytes;
r->pos = 0;
r->num_calls_cache = 0;
r->num_calls_read = 0;
r->num_calls_write = 0;
e = extract_buffer_open(r->alloc, r, NULL /*read*/, s_write, s_write_cache, s_write_buffer_close, o_buffer);
assert(!e);
}
static void test_write(void)
{
/* Create write buffer. */
size_t len = 12345;
mem_t r;
extract_buffer_t* buffer;
char* out_buffer;
unsigned i;
size_t out_pos = 0;
int its;
int e;
s_create_write_buffer(NULL /*alloc*/, len, &r, &buffer);
/* Write to read-buffer, and check it contains the original content. */
if (extract_malloc(r.alloc, &out_buffer, len)) abort();
for (i=0; i<len; ++i) {
out_buffer[i] = (char) ('a' + rand_int(26));
}
for (its=0;; ++its) {
size_t actual;
size_t n = rand_int(12)+1;
int e = extract_buffer_write(buffer, out_buffer+out_pos, n, &actual);
out_pos += actual;
assert(out_pos == extract_buffer_pos(buffer));
if (e == 1) break;
assert(!e);
}
assert(out_pos == len);
assert(!memcmp(out_buffer, r.data, len));
extract_free(r.alloc, &out_buffer);
outf("its=%i num_calls_read=%i num_calls_write=%i num_calls_cache=%i",
its, r.num_calls_read, r.num_calls_write, r.num_calls_cache);
e = extract_buffer_close(&buffer);
assert(!e);
outf("Write test passed.\n");
}
static void test_file(void)
{
/* Check we can write 3 bytes to file. */
extract_buffer_t* file_buffer;
if (extract_buffer_open_file(NULL /*alloc*/, "test/generated/buffer-file", 1 /*writable*/, &file_buffer)) abort();
{
size_t n;
int e;
errno = 0;
e = extract_buffer_write(file_buffer, "foo", 3, &n);
if (e == 0 && n == 3) {}
else {
outf("extract_buffer_write() returned e=%i errno=%i n=%zi", e, errno, n);
abort();
}
}
if (extract_buffer_close(&file_buffer)) abort();
/* Check we get back expected short reads and EOF when reading from 3-byte
file created above. */
if (extract_buffer_open_file(NULL /*alloc*/, "test/generated/buffer-file", 0 /*writable*/, &file_buffer)) abort();
{
size_t n;
char buffer[10];
int e;
errno = 0;
e = extract_buffer_read(file_buffer, buffer, 2, &n);
if (e == 0 && n == 2) {}
else {
outf("extract_buffer_read() returned e=%i errno=%i n=%zi", e, errno, n);
abort();
}
e = extract_buffer_read(file_buffer, buffer, 3, &n);
if (e == 1 && n == 1) {}
else {
outf("extract_buffer_read() returned e=%i errno=%i n=%zi", e, errno, n);
abort();
}
e = extract_buffer_read(file_buffer, buffer, 3, &n);
if (e == 1 && n == 0) {}
else {
outf("extract_buffer_read() returned e=%i errno=%i n=%zi", e, errno, n);
abort();
}
}
if (extract_buffer_close(&file_buffer)) abort();
/* Check writing to read-only file buffer fails. */
{
int e;
char text[] = "hello world";
size_t actual;
if (extract_buffer_open_file(NULL /*alloc*/, "test/generated/buffer-file", 0 /*writable*/, &file_buffer)) {
abort();
}
e = extract_buffer_write(file_buffer, text, sizeof(text)-1, &actual);
outf("extract_buffer_write() on read buffer returned e=%i actual=%zi", e, actual);
if (e != -1 || errno != EINVAL) abort();
if (extract_buffer_close(&file_buffer)) abort();
}
outf("file buffer tests passed.\n");
}
int main(void)
{
outf_verbose_set(1);
test_read();
test_write();
test_file();
return 0;
}
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