1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "lib/jxl/toc.h"
#include <vector>
#include "lib/jxl/base/common.h"
#include "lib/jxl/base/random.h"
#include "lib/jxl/base/span.h"
#include "lib/jxl/coeff_order_fwd.h"
#include "lib/jxl/enc_aux_out.h"
#include "lib/jxl/enc_toc.h"
#include "lib/jxl/testing.h"
namespace jxl {
namespace {
void Roundtrip(size_t num_entries, bool permute, Rng* rng) {
// Generate a random permutation.
std::vector<coeff_order_t> permutation;
std::vector<coeff_order_t> inv_permutation(num_entries);
for (size_t i = 0; i < num_entries; i++) {
inv_permutation[i] = i;
}
if (permute) {
permutation.resize(num_entries);
for (size_t i = 0; i < num_entries; i++) {
permutation[i] = i;
}
rng->Shuffle(permutation.data(), permutation.size());
for (size_t i = 0; i < num_entries; i++) {
inv_permutation[permutation[i]] = i;
}
}
// Generate num_entries groups of random (byte-aligned) length
std::vector<BitWriter> group_codes(num_entries);
for (BitWriter& writer : group_codes) {
const size_t max_bits = (*rng)() & 0xFFF;
BitWriter::Allotment allotment(&writer, max_bits + kBitsPerByte);
size_t i = 0;
for (; i + BitWriter::kMaxBitsPerCall < max_bits;
i += BitWriter::kMaxBitsPerCall) {
writer.Write(BitWriter::kMaxBitsPerCall, 0);
}
for (; i < max_bits; i += 1) {
writer.Write(/*n_bits=*/1, 0);
}
writer.ZeroPadToByte();
AuxOut aux_out;
allotment.ReclaimAndCharge(&writer, 0, &aux_out);
}
BitWriter writer;
AuxOut aux_out;
ASSERT_TRUE(WriteGroupOffsets(group_codes, permutation, &writer, &aux_out));
BitReader reader(writer.GetSpan());
std::vector<uint64_t> group_offsets;
std::vector<uint32_t> group_sizes;
uint64_t total_size;
ASSERT_TRUE(ReadGroupOffsets(num_entries, &reader, &group_offsets,
&group_sizes, &total_size));
ASSERT_EQ(num_entries, group_offsets.size());
ASSERT_EQ(num_entries, group_sizes.size());
EXPECT_TRUE(reader.Close());
uint64_t prefix_sum = 0;
for (size_t i = 0; i < num_entries; ++i) {
EXPECT_EQ(prefix_sum, group_offsets[inv_permutation[i]]);
EXPECT_EQ(0u, group_codes[i].BitsWritten() % kBitsPerByte);
prefix_sum += group_codes[i].BitsWritten() / kBitsPerByte;
if (i + 1 < num_entries) {
EXPECT_EQ(
group_offsets[inv_permutation[i]] + group_sizes[inv_permutation[i]],
group_offsets[inv_permutation[i + 1]]);
}
}
EXPECT_EQ(prefix_sum, total_size);
}
TEST(TocTest, Test) {
Rng rng(0);
for (size_t num_entries = 1; num_entries < 10; ++num_entries) {
for (bool permute : std::vector<bool>{false, true}) {
Roundtrip(num_entries, permute, &rng);
}
}
}
} // namespace
} // namespace jxl
|
