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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
// 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/decode_to_jpeg.h"
#include <jxl/decode.h>
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include "lib/jxl/base/span.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/common.h" // JPEGXL_ENABLE_TRANSCODE_JPEG
#include "lib/jxl/jpeg/dec_jpeg_data.h"
#include "lib/jxl/jpeg/jpeg_data.h"
namespace jxl {
#if JPEGXL_ENABLE_TRANSCODE_JPEG
JxlDecoderStatus JxlToJpegDecoder::Process(const uint8_t** next_in,
size_t* avail_in) {
if (!inside_box_) {
JXL_UNREACHABLE(
"processing of JPEG reconstruction data outside JPEG reconstruction "
"box");
}
Span<const uint8_t> to_decode;
if (box_until_eof_) {
// Until EOF means consume all data.
to_decode = Bytes(*next_in, *avail_in);
*next_in += *avail_in;
*avail_in = 0;
} else {
// Defined size means consume min(available, needed).
size_t avail_recon_in =
std::min<size_t>(*avail_in, box_size_ - buffer_.size());
to_decode = Bytes(*next_in, avail_recon_in);
*next_in += avail_recon_in;
*avail_in -= avail_recon_in;
}
bool old_data_exists = !buffer_.empty();
if (old_data_exists) {
// Append incoming data to buffer if we already had data in the buffer.
buffer_.insert(buffer_.end(), to_decode.data(),
to_decode.data() + to_decode.size());
to_decode = Bytes(buffer_.data(), buffer_.size());
}
if (!box_until_eof_ && to_decode.size() > box_size_) {
JXL_UNREACHABLE("JPEG reconstruction data to decode larger than expected");
}
if (box_until_eof_ || to_decode.size() == box_size_) {
// If undefined size, or the right size, try to decode.
jpeg_data_ = make_unique<jpeg::JPEGData>();
const auto status = jpeg::DecodeJPEGData(to_decode, jpeg_data_.get());
if (status.IsFatalError()) return JXL_DEC_ERROR;
if (status) {
// Successful decoding, emit event after updating state to track that we
// are no longer parsing JPEG reconstruction data.
inside_box_ = false;
return JXL_DEC_JPEG_RECONSTRUCTION;
}
if (box_until_eof_) {
// Unsuccessful decoding and undefined size, assume incomplete data. Copy
// the data if we haven't already.
if (!old_data_exists) {
buffer_.insert(buffer_.end(), to_decode.data(),
to_decode.data() + to_decode.size());
}
} else {
// Unsuccessful decoding of correct amount of data, assume error.
return JXL_DEC_ERROR;
}
} else {
// Not enough data, copy the data if we haven't already.
if (!old_data_exists) {
buffer_.insert(buffer_.end(), to_decode.data(),
to_decode.data() + to_decode.size());
}
}
return JXL_DEC_NEED_MORE_INPUT;
}
size_t JxlToJpegDecoder::NumExifMarkers(const jpeg::JPEGData& jpeg_data) {
size_t num = 0;
for (size_t i = 0; i < jpeg_data.app_data.size(); ++i) {
if (jpeg_data.app_marker_type[i] == jxl::jpeg::AppMarkerType::kExif) {
num++;
}
}
return num;
}
size_t JxlToJpegDecoder::NumXmpMarkers(const jpeg::JPEGData& jpeg_data) {
size_t num = 0;
for (size_t i = 0; i < jpeg_data.app_data.size(); ++i) {
if (jpeg_data.app_marker_type[i] == jxl::jpeg::AppMarkerType::kXMP) {
num++;
}
}
return num;
}
JxlDecoderStatus JxlToJpegDecoder::ExifBoxContentSize(
const jpeg::JPEGData& jpeg_data, size_t* size) {
for (size_t i = 0; i < jpeg_data.app_data.size(); ++i) {
if (jpeg_data.app_marker_type[i] == jxl::jpeg::AppMarkerType::kExif) {
if (jpeg_data.app_data[i].size() < 3 + sizeof(jpeg::kExifTag)) {
// too small for app marker header
return JXL_DEC_ERROR;
}
// The first 4 bytes are the TIFF header from the box contents, and are
// not included in the JPEG
*size = jpeg_data.app_data[i].size() + 4 - 3 - sizeof(jpeg::kExifTag);
return JXL_DEC_SUCCESS;
}
}
return JXL_DEC_ERROR;
}
JxlDecoderStatus JxlToJpegDecoder::XmlBoxContentSize(
const jpeg::JPEGData& jpeg_data, size_t* size) {
for (size_t i = 0; i < jpeg_data.app_data.size(); ++i) {
if (jpeg_data.app_marker_type[i] == jxl::jpeg::AppMarkerType::kXMP) {
if (jpeg_data.app_data[i].size() < 3 + sizeof(jpeg::kXMPTag)) {
// too small for app marker header
return JXL_DEC_ERROR;
}
*size = jpeg_data.app_data[i].size() - 3 - sizeof(jpeg::kXMPTag);
return JXL_DEC_SUCCESS;
}
}
return JXL_DEC_ERROR;
}
JxlDecoderStatus JxlToJpegDecoder::SetExif(const uint8_t* data, size_t size,
jpeg::JPEGData* jpeg_data) {
for (size_t i = 0; i < jpeg_data->app_data.size(); ++i) {
if (jpeg_data->app_marker_type[i] == jxl::jpeg::AppMarkerType::kExif) {
if (jpeg_data->app_data[i].size() !=
size + 3 + sizeof(jpeg::kExifTag) - 4)
return JXL_DEC_ERROR;
// The first 9 bytes are used for JPEG marker header.
jpeg_data->app_data[i][0] = 0xE1;
// The second and third byte are already filled in correctly
memcpy(jpeg_data->app_data[i].data() + 3, jpeg::kExifTag,
sizeof(jpeg::kExifTag));
// The first 4 bytes are the TIFF header from the box contents, and are
// not included in the JPEG
memcpy(jpeg_data->app_data[i].data() + 3 + sizeof(jpeg::kExifTag),
data + 4, size - 4);
return JXL_DEC_SUCCESS;
}
}
return JXL_DEC_ERROR;
}
JxlDecoderStatus JxlToJpegDecoder::SetXmp(const uint8_t* data, size_t size,
jpeg::JPEGData* jpeg_data) {
for (size_t i = 0; i < jpeg_data->app_data.size(); ++i) {
if (jpeg_data->app_marker_type[i] == jxl::jpeg::AppMarkerType::kXMP) {
if (jpeg_data->app_data[i].size() != size + 3 + sizeof(jpeg::kXMPTag))
return JXL_DEC_ERROR;
// The first 9 bytes are used for JPEG marker header.
jpeg_data->app_data[i][0] = 0xE1;
// The second and third byte are already filled in correctly
memcpy(jpeg_data->app_data[i].data() + 3, jpeg::kXMPTag,
sizeof(jpeg::kXMPTag));
memcpy(jpeg_data->app_data[i].data() + 3 + sizeof(jpeg::kXMPTag), data,
size);
return JXL_DEC_SUCCESS;
}
}
return JXL_DEC_ERROR;
}
#endif // JPEGXL_ENABLE_TRANSCODE_JPEG
} // namespace jxl
|
