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/* test_deflate_bound.cc - Test deflateBound() with small buffers */
#include "zbuild.h"
#ifdef ZLIB_COMPAT
# include "zlib.h"
#else
# include "zlib-ng.h"
#endif
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <gtest/gtest.h>
#include "test_shared.h"
#define MAX_LENGTH (32)
typedef struct {
int32_t level;
int32_t window_size;
int32_t mem_level;
bool after_init;
} deflate_bound_test;
static const deflate_bound_test tests[] = {
{0, MAX_WBITS + 16, 1, true},
{Z_BEST_SPEED, MAX_WBITS, MAX_MEM_LEVEL, true},
{Z_BEST_COMPRESSION, MAX_WBITS, MAX_MEM_LEVEL, true},
{Z_BEST_SPEED, MAX_WBITS, MAX_MEM_LEVEL, false},
{Z_BEST_COMPRESSION, MAX_WBITS, MAX_MEM_LEVEL, false},
};
class deflate_bound_variant : public testing::TestWithParam<deflate_bound_test> {
public:
void estimate(deflate_bound_test param) {
PREFIX3(stream) c_stream;
int estimate_len = 0;
uint8_t *uncompressed = NULL;
uint8_t *out_buf = NULL;
int err;
uncompressed = (uint8_t *)malloc(MAX_LENGTH);
ASSERT_TRUE(uncompressed != NULL);
memset(uncompressed, 'a', MAX_LENGTH);
for (int32_t i = 0; i < MAX_LENGTH; i++) {
memset(&c_stream, 0, sizeof(c_stream));
c_stream.avail_in = i;
c_stream.next_in = (z_const unsigned char *)uncompressed;
c_stream.avail_out = 0;
c_stream.next_out = out_buf;
if (!param.after_init)
estimate_len = PREFIX(deflateBound)(&c_stream, i);
err = PREFIX(deflateInit2)(&c_stream, param.level, Z_DEFLATED,
param.window_size, param.mem_level, Z_DEFAULT_STRATEGY);
EXPECT_EQ(err, Z_OK);
/* calculate actual output length and update structure */
if (param.after_init)
estimate_len = PREFIX(deflateBound)(&c_stream, i);
out_buf = (uint8_t *)malloc(estimate_len);
if (out_buf != NULL) {
/* update zlib configuration */
c_stream.avail_out = estimate_len;
c_stream.next_out = out_buf;
/* do the compression */
err = PREFIX(deflate)(&c_stream, Z_FINISH);
EXPECT_EQ(err, Z_STREAM_END) <<
"level: " << param.level << "\n" <<
"window_size: " << param.window_size << "\n" <<
"mem_level: " << param.mem_level << "\n" <<
"after_init: " << param.after_init << "\n" <<
"length: " << i;
free(out_buf);
out_buf = NULL;
}
err = PREFIX(deflateEnd)(&c_stream);
EXPECT_EQ(err, Z_OK);
}
free(uncompressed);
}
};
TEST_P(deflate_bound_variant, estimate) {
estimate(GetParam());
}
INSTANTIATE_TEST_SUITE_P(deflate_bound, deflate_bound_variant, testing::ValuesIn(tests));
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