summaryrefslogtreecommitdiff
path: root/oss-fuzz/fuzzer_encoder_v2.cc
blob: de68cb3706d32bfe46f4d245d2bc0f2d69814f6a (plain)
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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
/* fuzzer_encoder_v2
 * Copyright (C) 2022  Xiph.Org Foundation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of the Xiph.org Foundation nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <cstdlib>
#include <cstring> /* for memcpy */
#include "FLAC/stream_encoder.h"
#include "FLAC/metadata.h"
extern "C" {
#include "share/private.h"
}

/* This C++ fuzzer uses the FLAC and not FLAC++ because the latter lacks a few
 * hidden functions like FLAC__stream_encoder_disable_constant_subframes. It
 * is still processed by a C++ compiler because that's what oss-fuzz expects */


static FLAC__StreamEncoderWriteStatus write_callback(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, uint32_t samples, uint32_t current_frame, void *client_data)
{
	(void)encoder, (void)buffer, (void)bytes, (void)samples, (void)current_frame, (void)client_data;
	return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
	FLAC__bool encoder_valid = true;
	FLAC__StreamEncoder *encoder = 0;
	FLAC__StreamMetadata *metadata[16] = {NULL};
	unsigned num_metadata = 0;
	FLAC__StreamMetadata_VorbisComment_Entry VorbisCommentField;

	unsigned sample_rate, channels, bps;
	uint64_t samples_estimate;
	unsigned compression_level, input_data_width, blocksize, max_lpc_order, qlp_coeff_precision, min_residual_partition_order, max_residual_partition_order, metadata_mask, instruction_set_disable_mask;
	FLAC__bool ogg, write_to_file, interleaved;

	FLAC__bool data_bools[24];

	/* allocate the encoder */
	if((encoder = FLAC__stream_encoder_new()) == NULL) {
		fprintf(stderr, "ERROR: allocating encoder\n");
		return 1;
	}

	/* Use first 20 byte for configuration */
	if(size < 20){
		FLAC__stream_encoder_delete(encoder);
		return 0;
	}

	/* First 3 byte for sample rate, 4th byte for channels, 5th byte for bps */
	sample_rate = ((unsigned)data[0] << 16) + ((unsigned)data[1] << 8) + data[2];
	channels = data[3];
	bps = data[4];

	/* Number of samples estimate, format accepts 36-bit max */
	samples_estimate = ((uint64_t)data[5] << 32) + ((unsigned)data[6] << 24) + ((unsigned)data[7] << 16) + ((unsigned)data[8] << 8) + data[9];

	compression_level = data[10]&0b1111;
	input_data_width = 1 + (data[10]>>4)%4;
	blocksize = ((unsigned)data[11] << 8) + (unsigned)data[12];
	max_lpc_order = data[13];
	qlp_coeff_precision = data[14];
	min_residual_partition_order = data[15] & 0b1111;
	max_residual_partition_order = data[15] & 0b11110000;
	metadata_mask = data[16];
	instruction_set_disable_mask = data[17];

	/* Get array of bools from configuration */
	for(int i = 0; i < 16; i++)
		data_bools[i] = data[18+i/8] & (1 << (i % 8));

	ogg = data_bools[0];
	interleaved = data_bools[1];
	write_to_file = data_bools[13];

	/* Set input and process parameters */
	encoder_valid &= FLAC__stream_encoder_set_verify(encoder, data_bools[2]);
	encoder_valid &= FLAC__stream_encoder_set_channels(encoder, channels);
	encoder_valid &= FLAC__stream_encoder_set_bits_per_sample(encoder, bps);
	encoder_valid &= FLAC__stream_encoder_set_sample_rate(encoder, sample_rate);
	encoder_valid &= FLAC__stream_encoder_set_total_samples_estimate(encoder, samples_estimate);
	encoder_valid &= FLAC__stream_encoder_disable_instruction_set(encoder, instruction_set_disable_mask);

	/* Set compression related parameters */
	encoder_valid &= FLAC__stream_encoder_set_compression_level(encoder, compression_level);
	if(data_bools[3]){
		/* Bias towards regular compression levels */
		encoder_valid &= FLAC__stream_encoder_set_streamable_subset(encoder, data_bools[4]);
		encoder_valid &= FLAC__stream_encoder_set_blocksize(encoder, blocksize);
		encoder_valid &= FLAC__stream_encoder_set_max_lpc_order(encoder, max_lpc_order);
		encoder_valid &= FLAC__stream_encoder_set_qlp_coeff_precision(encoder, qlp_coeff_precision);
		encoder_valid &= FLAC__stream_encoder_set_min_residual_partition_order(encoder, min_residual_partition_order);
		encoder_valid &= FLAC__stream_encoder_set_max_residual_partition_order(encoder, max_residual_partition_order);

		if(size < (1 << 18)) {
			/* The following three options are **slow**, and when combined with a large input
			 * make fuzzers timeout, so only enable them on reasonably sized inputs. 2^17 is taken
			 * because that is the maximum blocksize * 4 (32-bit input)
			 */
			encoder_valid &= FLAC__stream_encoder_set_do_qlp_coeff_prec_search(encoder, data_bools[5]);
			encoder_valid &= FLAC__stream_encoder_set_do_escape_coding(encoder, data_bools[6]);
			encoder_valid &= FLAC__stream_encoder_set_do_exhaustive_model_search(encoder, data_bools[7]);
		}
		encoder_valid &= FLAC__stream_encoder_set_do_mid_side_stereo(encoder, data_bools[8]);
		encoder_valid &= FLAC__stream_encoder_set_loose_mid_side_stereo(encoder, data_bools[9]);

		encoder_valid &= FLAC__stream_encoder_disable_constant_subframes(encoder, data_bools[10]);
		encoder_valid &= FLAC__stream_encoder_disable_fixed_subframes(encoder, data_bools[11]);
		encoder_valid &= FLAC__stream_encoder_disable_verbatim_subframes(encoder, data_bools[12]);
	}

	/* data_bools[14..15] are spare */

	/* add metadata */
	if(encoder_valid && (metadata_mask & 1)) {
		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_STREAMINFO)) == NULL)
			encoder_valid = false;
		else
			num_metadata++;
	}
	if(encoder_valid && (metadata_mask & 2) && size > 21){
		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL)
			encoder_valid = false;
		else {
			metadata[num_metadata++]->length = (((unsigned)data[20]) << 8) + (unsigned)(data[21]);
		}
	}
	if(encoder_valid && (metadata_mask & 4) && size > 20){
		FLAC__byte * application_data = (FLAC__byte *)malloc(size-20);
		if(0 != application_data && ((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_APPLICATION)) == NULL))
			encoder_valid = false;
		else {
			memcpy(application_data,data+20,size-20);
			FLAC__metadata_object_application_set_data(metadata[num_metadata++], application_data, size-20, 0);
		}
	}
	if(encoder_valid && (metadata_mask & 8) && size > 25){
		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_SEEKTABLE)) == NULL)
			encoder_valid = false;
		else {
			unsigned seekpoint_spacing = ((unsigned)data[22] << 8) + data[23];
			unsigned total_samples_for_seekpoints = ((unsigned)data[24] << 8) + data[25];
			FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(metadata[num_metadata++], seekpoint_spacing, total_samples_for_seekpoints);
		}
	}
	if(encoder_valid && (metadata_mask & 16)){
		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) == NULL)
			encoder_valid = false;
		else {
			/* Append a vorbis comment */
			if(!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&VorbisCommentField, "COMMENTARY", "Nothing to 🤔 report"))
				encoder_valid = false;
			else {
				FLAC__metadata_object_vorbiscomment_append_comment(metadata[num_metadata], VorbisCommentField, false);

				/* Insert a vorbis comment at the first index */
				if(!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&VorbisCommentField, "COMMENTARY", "Still nothing to report 🤔🤣"))
					encoder_valid = false;
				else
					FLAC__metadata_object_vorbiscomment_insert_comment(metadata[num_metadata++], 0, VorbisCommentField, false);
			}
		}
	}

	if(num_metadata && encoder_valid)
			encoder_valid = FLAC__stream_encoder_set_metadata(encoder, metadata, num_metadata);

	/* initialize encoder */
	if(encoder_valid) {
		FLAC__StreamEncoderInitStatus init_status;
		if(ogg)
			if(write_to_file)
				init_status = FLAC__stream_encoder_init_ogg_file(encoder, "/tmp/tmp.flac", NULL, NULL);
			else
				init_status = FLAC__stream_encoder_init_ogg_stream(encoder, NULL, write_callback, NULL, NULL, NULL, NULL);
		else
			if(write_to_file)
				init_status = FLAC__stream_encoder_init_file(encoder, "/tmp/tmp.flac", NULL, NULL);
			else
				init_status = FLAC__stream_encoder_init_stream(encoder, write_callback, NULL, NULL, NULL, NULL);
		if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
			encoder_valid = false;
		}
	}


	/* send samples to encoder */
	if(encoder_valid && size > (input_data_width*channels+26)) {
		unsigned samples = (size - 26)/input_data_width/channels;
		const uint8_t * pcm_data = data + 26;
		int32_t * data_as_int32 = (int32_t *)malloc(4*samples*channels);
		if(0 != data_as_int32){
			for(unsigned i = 0; i < samples*channels; i++)
				if(input_data_width == 1)
					data_as_int32[i] = (int32_t)pcm_data[i] - 0x80;
				else if(input_data_width == 2)
					data_as_int32[i] = (((int32_t)pcm_data[i*2] << 8) + pcm_data[i*2+1]) - 0x8000;
				else if(input_data_width == 3)
					data_as_int32[i] = (((int32_t)pcm_data[i*3] << 16) + ((int32_t)pcm_data[i*3+1] << 8) + pcm_data[i*3+2]) - 0x800000;
				else if(input_data_width == 4)
					data_as_int32[i] = (((int64_t)pcm_data[i*4] << 24) + ((int32_t)pcm_data[i*4+1] << 16) + ((int32_t)pcm_data[i*4+2] << 8) + pcm_data[i*4+3]) - 0x80000000;

			/* feed samples to encoder */
			if(interleaved)
				encoder_valid = FLAC__stream_encoder_process_interleaved(encoder, data_as_int32, samples);
			else {
				encoder_valid = FLAC__stream_encoder_process(encoder, (const int32_t*[]){data_as_int32,
				                                                       data_as_int32+samples,
				                                                       data_as_int32+samples*2,
				                                                       data_as_int32+samples*3,
				                                                       data_as_int32+samples*4, data_as_int32+samples*5, data_as_int32+samples*6, data_as_int32+samples*7}, samples);
			}
			free(data_as_int32);
		}
		else {
			encoder_valid = false;
		}
	}

	if(FLAC__stream_encoder_get_state(encoder) != FLAC__STREAM_ENCODER_OK &&
	   FLAC__stream_encoder_get_state(encoder) != FLAC__STREAM_ENCODER_UNINITIALIZED &&
	   FLAC__stream_encoder_get_state(encoder) != FLAC__STREAM_ENCODER_CLIENT_ERROR){
		fprintf(stderr,"-----\nERROR: stream encoder returned %s\n-----\n",FLAC__stream_encoder_get_resolved_state_string(encoder));
		abort();
	}

	FLAC__stream_encoder_finish(encoder);

	/* now that encoding is finished, the metadata can be freed */
	for(unsigned i = 0; i < 16; i++)
		if(0 != metadata[i])
			FLAC__metadata_object_delete(metadata[i]);

	FLAC__stream_encoder_delete(encoder);

	return 0;
}