Line data Source code
1 : #ifndef HEADER_fd_src_ballet_shred_fd_shred_h
2 : #define HEADER_fd_src_ballet_shred_fd_shred_h
3 :
4 : #include "../bmtree/fd_bmtree.h"
5 :
6 : /* Shreds form the on-wire representation of Solana block data
7 : optimized for transmission over unreliable links/WAN.
8 :
9 : ### Layout
10 :
11 : Each shred is 1228 bytes long.
12 :
13 : +------------------------+
14 : | Common Shred Header | 83 bytes
15 : +------------------------+
16 : | Data Header | 5 bytes
17 : | or Coding Header | or 6 bytes
18 : +------------------------+
19 : | | variable
20 : | Payload | length
21 : | |
22 : +------------------------+
23 :
24 : for Merkle shreds, followed by:
25 :
26 : +------------------------+
27 : | (Chained merkle root) | 32 bytes
28 : +------------------------+
29 : +------------------------+
30 : | Merkle node #0 (root) | 20 bytes
31 : +------------------------+
32 : | Merkle node #1 | 20 bytes
33 : ..........................
34 :
35 : for resigned shreds, followed by:
36 :
37 : +------------------------+
38 : | signature | 64 bytes
39 : ..........................
40 :
41 : ### Shredding
42 :
43 : For a given input data blob (usually an entry batch),
44 : data shreds are derived by simply splitting up the blob into subslices.
45 :
46 : Each shred is sized such that it fits into a single UDP packet,
47 : i.e. currently bound by the generally accepted IPv6 MTU of 1280 bytes.
48 :
49 : ### Forward Error Correction
50 :
51 : Coding shreds implement Reed-Solomon error correction to provide tolerance against packet loss.
52 :
53 : Each data shred is first assigned an FEC set.
54 : For the vector of data shreds in each set, a corresponding vector of coding shreds contains parity data.
55 :
56 : FEC sets and entry batches do not necessarily align.
57 :
58 : ### Merkle Inclusion Proofs
59 :
60 : Data and coding shreds come in two variants respectively: legacy and merkle.
61 : Merkle shreds extend legacy shreds by adding FEC set inclusion proofs.
62 :
63 : It allows the block producer to commit to the vector of shreds that make up an FEC set.
64 : The inclusion proof is used to verify whether a shred is part of the FEC set commitment.
65 :
66 : The length of the inclusion proof is indicated by the variant field.
67 :
68 : ### resigned shreds
69 :
70 : Resigned shreds allow for an additional signature to be added on to lock down
71 : the retransmitter for turbine propagation
72 :
73 : ### Authentication
74 :
75 : Shreds are signed by the block producer.
76 : Consequently, only the block producer is able to create valid shreds for any given block. */
77 :
78 : #include "../fd_ballet.h"
79 :
80 : /* FD_SHRED_MAX_SZ: The max byte size of a shred.
81 : This limit derives from the IPv6 MTU of 1280 bytes, minus 48 bytes
82 : for the UDP/IPv6 headers and another 4 bytes for good measure. Most
83 : shreds are this size, but Merkle data shreds may be smaller. */
84 26841782 : #define FD_SHRED_MAX_SZ (1228UL)
85 : /* FD_SHRED_MIN_SZ: The minimum byte size of a shred.
86 : A code shred of the max size covers a data shred of the minimum size
87 : with no padding. */
88 26839046 : #define FD_SHRED_MIN_SZ (1203UL)
89 : /* FD_SHRED_DATA_HEADER_SZ: size of all headers for data type shreds. */
90 12218340 : #define FD_SHRED_DATA_HEADER_SZ (0x58UL)
91 : /* FD_SHRED_CODE_HEADER_SZ: size of all headers for coding type shreds. */
92 6219753 : #define FD_SHRED_CODE_HEADER_SZ (0x59UL)
93 : /* This is a conservative bound.
94 : It's possible for a modified validator to create a data shred with
95 : this much payload.
96 : A validator that follows the default shredding policy should have
97 : payloads of no more than 1015 bytes.
98 : In general, shreds that are chained or resigned should have smaller
99 : payloads and a tigher bound. */
100 3 : #define FD_SHRED_DATA_PAYLOAD_MAX (FD_SHRED_MIN_SZ-FD_SHRED_DATA_HEADER_SZ)
101 :
102 : /* FD_SHRED_TYPE_* identifies the type of a shred.
103 : It is located at the four high bits of byte 0x40 (64) of the shred header
104 : and can be extracted using the fd_shred_type() function. */
105 : /* FD_SHRED_TYPE_LEGACY_DATA: A shred carrying raw binary data. */
106 14793752 : #define FD_SHRED_TYPE_LEGACY_DATA ((uchar)0xA0)
107 : /* FD_SHRED_TYPE_LEGACY_CODE: A shred carrying Reed-Solomon ECC. */
108 0 : #define FD_SHRED_TYPE_LEGACY_CODE ((uchar)0x50)
109 : /* FD_SHRED_TYPE_MERKLE_DATA: A shred carrying raw binary data and a merkle inclusion proof. */
110 197970 : #define FD_SHRED_TYPE_MERKLE_DATA ((uchar)0x80)
111 : /* FD_SHRED_TYPE_MERKLE_CODE: A shred carrying Reed-Solomon ECC and a merkle inclusion proof. */
112 27381197 : #define FD_SHRED_TYPE_MERKLE_CODE ((uchar)0x40)
113 : /* FD_SHRED_TYPE_MERKLE_DATA_CHAINED: A shred carrying raw binary data and a chained merkle inclusion proof. */
114 280680 : #define FD_SHRED_TYPE_MERKLE_DATA_CHAINED ((uchar)0x90)
115 : /* FD_SHRED_TYPE_MERKLE_CODE_CHAINED: A shred carrying Reed-Solomon ECC and a chained merkle inclusion proof. */
116 279816 : #define FD_SHRED_TYPE_MERKLE_CODE_CHAINED ((uchar)0x60)
117 :
118 : /* FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED: A shred carrying raw binary data and a chained merkle inclusion proof and resigned. */
119 24381129 : #define FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED ((uchar)0xB0)
120 : /* FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED: A shred carrying Reed-Solomon ECC and a chained merkle inclusion proof and resigned. */
121 24379497 : #define FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED ((uchar)0x70)
122 :
123 : /* FD_SHRED_TYPEMASK_DATA: bitwise AND with type matches data shred */
124 : #define FD_SHRED_TYPEMASK_DATA FD_SHRED_TYPE_MERKLE_DATA
125 : /* FD_SHRED_TYPEMASK_CODE: bitwise AND with type matches code shred */
126 26810678 : #define FD_SHRED_TYPEMASK_CODE FD_SHRED_TYPE_MERKLE_CODE
127 :
128 : /* FD_SHRED_MERKLE_ROOT_SZ: the size of a merkle tree root in bytes. */
129 24302538 : #define FD_SHRED_MERKLE_ROOT_SZ (32UL)
130 : /* FD_SHRED_MERKLE_NODE_SZ: the size of a merkle inclusion proof node in bytes. */
131 24322212 : #define FD_SHRED_MERKLE_NODE_SZ (20UL)
132 : /* FD_SHRED_MERKLE_LAYER_CNT: the count of inclusion proof layers in the binary merkle tree. */
133 6153 : #define FD_SHRED_MERKLE_LAYER_CNT (7UL)
134 : /* FD_SHRED_SIGNATURE_SZ: the size of a signature in a shred. */
135 27221877 : #define FD_SHRED_SIGNATURE_SZ (64UL)
136 : /* A merkle inclusion proof node. */
137 : typedef uchar fd_shred_merkle_t[FD_SHRED_MERKLE_NODE_SZ];
138 :
139 : FD_STATIC_ASSERT( sizeof(fd_bmtree_node_t) == FD_SHRED_MERKLE_ROOT_SZ, update FD_SHRED_MERKLE_ROOT_SZ );
140 :
141 : /* Constants relating to the data shred "flags" field. */
142 :
143 : /* Mask of the "reference tick" field in shred.data.flags */
144 0 : #define FD_SHRED_DATA_REF_TICK_MASK ((uchar)0x3f)
145 : /* Mask of the "slot complete" bit in shred.data.flags
146 : Indicates the last shred in a slot. */
147 5631 : #define FD_SHRED_DATA_FLAG_SLOT_COMPLETE ((uchar)0x80)
148 : /* Mask of the "data batch complete" bit in shred.data.flags */
149 7260 : #define FD_SHRED_DATA_FLAG_DATA_COMPLETE ((uchar)0x40)
150 :
151 : /* Maximum number of data shreds in a slot, also maximum number of parity shreds in a slot */
152 13065 : #define FD_SHRED_BLK_MAX (1 << 15UL) /* 32,768 shreds */
153 :
154 : /* Many static bounds are specified around the assumption that this is a
155 : protocol limit on the max number of shreds in a slot. If this limit
156 : changes, all the relevant usages in other areas of the Firedancer
157 : codebase should be updated before modifying this assertion. */
158 :
159 : FD_STATIC_ASSERT( FD_SHRED_BLK_MAX == 32768, check all usages before changing this limit! );
160 :
161 : /* Largest [development.bench.max_shreds_per_block] a benchmark cluster
162 : may raise the per-block shred limit to: the chainer's fec_set_idx is
163 : 28 bits. Sizes what must hold any configurable limit (repair proof
164 : depth). */
165 : #define FD_SHRED_BLK_MAX_RAISED (1UL<<28)
166 :
167 : /* 36,536,320 bytes per slot */
168 : #define FD_SHRED_DATA_PAYLOAD_MAX_PER_SLOT (FD_SHRED_DATA_PAYLOAD_MAX * FD_SHRED_BLK_MAX)
169 :
170 : /* Firedancer-specific internal error codes.
171 :
172 : These are not part of the Solana protocol. */
173 :
174 21 : #define FD_SHRED_EBATCH 0x4000 /* End of batch reached (success)
175 : no more shreds and found FD_SHRED_DATA_FLAG_DATA_COMPLETE */
176 9 : #define FD_SHRED_ESLOT 0x8000 /* End of slot reached (success)
177 : no more shreds and found FD_SHRED_DATA_FLAG_SLOT_COMPLETE */
178 0 : #define FD_SHRED_ENOMEM 12 /* Error: Target buffer too small */
179 0 : #define FD_SHRED_EINVAL 22 /* Error: Invalid shred data */
180 27 : #define FD_SHRED_EPIPE 32 /* Error: Expected data in source buffer, got EOF */
181 :
182 : /* Primary shred data structure.
183 : Relies heavily on packed fields and unaligned memory accesses. */
184 : struct __attribute__((packed)) fd_shred {
185 : /* Ed25519 signature over the shred
186 :
187 : For legacy type shreds, signs over content of the shred structure past this signature field.
188 : For merkle type shreds, signs over the first node of the inclusion proof (merkle root). */
189 : /* 0x00 */ fd_ed25519_sig_t signature;
190 :
191 : /* Shred variant specifier
192 : Consists of two four bit fields. (Deliberately not using bit fields here)
193 :
194 : The high four bits indicate the shred type:
195 : - 0101: legacy code
196 : - 1010: legacy data
197 : - 0100: merkle code
198 : - 0110: merkle code (chained)
199 : - 0111: merkle code (chained resigned)
200 : - 1000: merkle data
201 : - 1001: merkle data (chained)
202 : - 1011: merkle data (chained resigned)
203 :
204 : For legacy type shreds, the low four bits are set to static patterns.
205 : For merkle type shreds, the low four bits are set to the number of non-root nodes in the inclusion proof.
206 : For merkle code type shreds, the 3rd highest bit represents if the merkle tree is chained.
207 : For merkle data type shreds, the 4th highest bit represents if the merkle tree is chained.
208 : For merkle code type shreds, the 4th highest bit represents if the shred is resigned.
209 : For merkle data type shreds, the 3th highest bit represents if the shred is resigned.
210 : */
211 : /* 0x40 */ uchar variant;
212 :
213 : /* Slot number that this shred is part of */
214 : /* 0x41 */ ulong slot;
215 :
216 : /* Index of this shred within the slot */
217 : /* 0x49 */ uint idx;
218 :
219 : /* Hash of the genesis version and historical hard forks of the current chain */
220 : /* 0x4d */ ushort version;
221 :
222 : /* Index into the vector of FEC sets for this slot. For data shreds, fec_set_idx<=idx. */
223 : /* 0x4f */ uint fec_set_idx;
224 :
225 : union {
226 : /* Common data shred header */
227 : struct __attribute__((packed)) {
228 : /* Slot number difference between this block and the parent block.
229 : parent_off <= slot.
230 : Always greater than zero, except for slot 0, in which case the
231 : previous invariant forces this to be 0. */
232 : /* 0x53 */ ushort parent_off;
233 :
234 : /* Bit field (MSB first)
235 : See FD_SHRED_DATA_FLAG_*
236 :
237 : [XX.. ....] Block complete? 0b00=no 0b01=no 0b11=yes (implies Entry batch complete)
238 : [.X.. ....] Entry batch complete? 0b0=no 0b1=yes
239 : [..XX XXXX] Reference tick number */
240 : /* 0x55 */ uchar flags;
241 :
242 : /* Shred size: size of data shred headers (88 bytes) + payload length */
243 : /* 0x56 */ ushort size;
244 : } data;
245 :
246 : /* Common coding shred header */
247 : struct __attribute__((packed)) {
248 : /* Total number of data shreds in FEC set. Must be positive <= FD_REEDSOL_DATA_SHREDS_MAX. */
249 : /* 0x53 */ ushort data_cnt;
250 :
251 : /* Total number of coding shreds in FEC set. Must be positive <= FD_REEDSOL_CODE_SHREDS_MAX. */
252 : /* 0x55 */ ushort code_cnt;
253 :
254 : /* Index within the vector of coding shreds in FEC set. In [0,
255 : code_cnt). Also, shred.code.idx <= shred.idx. */
256 : /* 0x57 */ ushort idx;
257 : } code;
258 : };
259 : };
260 : typedef struct fd_shred fd_shred_t;
261 :
262 : FD_PROTOTYPES_BEGIN
263 :
264 : /* fd_shred_parse: Parses and validates an untrusted shred stored in
265 : bytes buf[i] for i in [0, sz). sz must be at least FD_SHRED_MIN_SZ bytes.
266 : Allows trailing data. max_shred_idx is the exclusive upper bound for
267 : data/parity shred indices within a slot, similar to max_shred_idx in
268 : fd_fec_resolver.
269 :
270 : The returned pointer either equals the input pointer or is NULL if
271 : the given shred is malformed or violates any invariants described
272 : above. */
273 : FD_FN_PURE fd_shred_t const *
274 : fd_shred_parse( uchar const * buf,
275 : ulong sz,
276 : ulong max_shred_idx );
277 :
278 : /* fd_shred_type: Returns the value of the shred's type field. (FD_SHRED_TYPE_*) */
279 : FD_FN_CONST static inline uchar
280 64820578 : fd_shred_type( uchar variant ) {
281 64820578 : return variant & 0xf0;
282 64820578 : }
283 :
284 : /* fd_shred_variant: Returns the encoded variant field
285 : given the shred type and merkle proof length. */
286 : FD_FN_CONST static inline uchar
287 : fd_shred_variant( uchar type,
288 12381819 : uchar merkle_cnt ) {
289 12381819 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_DATA ) )
290 1128 : merkle_cnt = 0x05;
291 12381819 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_CODE ) )
292 3 : merkle_cnt = 0x0a;
293 12381819 : return (uchar)(type | merkle_cnt);
294 12381819 : }
295 :
296 : FD_FN_PURE static inline ulong
297 14779889 : fd_shred_sz( fd_shred_t const * shred ) {
298 14779889 : uchar type = fd_shred_type( shred->variant );
299 14779889 : return fd_ulong_if(
300 14779889 : type & FD_SHRED_TYPEMASK_CODE,
301 14779889 : FD_SHRED_MAX_SZ,
302 14779889 : fd_ulong_if( type==FD_SHRED_TYPE_LEGACY_DATA, shred->data.size, FD_SHRED_MIN_SZ)
303 14779889 : ); /* Legacy data */
304 14779889 : }
305 :
306 : /* fd_shred_header_sz: Returns the header size of a shred.
307 : Returns zero if the shred has an invalid variant.
308 :
309 : Accesses offsets up to FD_SHRED_HEADER_MIN_SZ. */
310 : FD_FN_CONST static inline ulong
311 26373 : fd_shred_header_sz( uchar variant ) {
312 26373 : uchar type = fd_shred_type( variant );
313 26373 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) )
314 12885 : return FD_SHRED_DATA_HEADER_SZ;
315 13488 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_CODE ) )
316 13488 : return FD_SHRED_CODE_HEADER_SZ;
317 0 : return 0;
318 13488 : }
319 :
320 : /* fd_shred_merkle_cnt: Returns number of nodes in the merkle inclusion
321 : proof. Note that this excludes the root. Returns zero if the given
322 : shred is not a merkle variant. */
323 : FD_FN_CONST static inline uint
324 24108183 : fd_shred_merkle_cnt( uchar variant ) {
325 24108183 : uchar type = fd_shred_type( variant );
326 24108183 : if( FD_UNLIKELY( ( type == FD_SHRED_TYPE_LEGACY_DATA ) | ( type == FD_SHRED_TYPE_LEGACY_CODE ) ) )
327 69 : return 0;
328 24108114 : return (variant&0xfU);
329 24108183 : }
330 :
331 : /* fd_shred_merkle_sz: Returns the size in bytes of the merkle inclusion proof.
332 : Returns zero if the given shred is not a merkle variant. */
333 : FD_FN_CONST static inline ulong
334 24073992 : fd_shred_merkle_sz( uchar variant ) {
335 24073992 : return fd_shred_merkle_cnt( variant ) * FD_SHRED_MERKLE_NODE_SZ;
336 24073992 : }
337 :
338 :
339 : /* fd_shred_is_chained: Returns true if the shred is a chained merkle data or code shred. */
340 : FD_FN_CONST static inline uchar
341 88773 : fd_shred_is_chained( ulong type ) {
342 88773 : return (uchar)(
343 88773 : ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED )
344 88773 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED )
345 88773 : | ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
346 88773 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED ) );
347 88773 : }
348 :
349 : /* fd_shred_is_resigned: Returns true if the shred is resigned by the retransmitter */
350 : FD_FN_CONST static inline uchar
351 24101370 : fd_shred_is_resigned( ulong type ) {
352 24101370 : return ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
353 24101370 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED );
354 24101370 : }
355 :
356 : /* fd_shred_is_{data,code} return 1 if the provided shred type is one of
357 : the data (or code, respectively) types, and 0 if not. The value
358 : provided for type must be a valid shred type (one of the
359 : FD_SHRED_TYPE_* values). For the purposes of these functions,
360 : properties beyond data/code are ignored; e.g. a chained resigned
361 : Merkle data shred is considered a data shred. */
362 1791477 : FD_FN_CONST static inline uchar fd_shred_is_data( ulong type ) { return (type & 0xC0UL)==0x80UL; }
363 5598 : FD_FN_CONST static inline uchar fd_shred_is_code( ulong type ) { return (type & 0xC0UL)==0x40UL; }
364 :
365 : /* fd_shred_swap_type: changes data into code or vice versa without
366 : affecting legacy, merkle, chained, or resigned status. For example,
367 : fd_shred_swap_type( chained resigned data ) == chained resigned code.
368 : fd_shred_swap_type( merkle code ) == merkle data. */
369 : FD_FN_CONST static inline uchar
370 7560 : fd_shred_swap_type( ulong type ) {
371 : /* Swap bits 4 and 5. Swap bits 6 and 7. */
372 7560 : return (uchar)(((type & 0x50UL)<<1) | ((type&0xA0UL)>>1));
373 7560 : }
374 :
375 : /* fd_shred_payload_sz: Returns the payload size of a shred.
376 : Undefined behavior if the shred has not passed `fd_shred_parse`. */
377 : FD_FN_PURE static inline ulong
378 465 : fd_shred_payload_sz( fd_shred_t const * shred ) {
379 465 : ulong type = fd_shred_type( shred->variant );
380 465 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) ) {
381 318 : return shred->data.size - FD_SHRED_DATA_HEADER_SZ;
382 318 : } else {
383 147 : return fd_shred_sz( shred ) - FD_SHRED_CODE_HEADER_SZ
384 147 : - fd_shred_merkle_sz( shred->variant )
385 147 : - fd_ulong_if( fd_shred_is_chained( type ), FD_SHRED_MERKLE_ROOT_SZ, 0 )
386 147 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
387 147 : }
388 465 : }
389 :
390 : /* fd_shred_merkle_off: Returns the byte offset of the merkle inclusion proof of a shred.
391 :
392 : The provided shred must have passed validation in fd_shred_parse(). */
393 : FD_FN_PURE static inline ulong
394 12016683 : fd_shred_merkle_off( fd_shred_t const * shred ) {
395 12016683 : ulong type = fd_shred_type( shred->variant );
396 12016683 : return fd_shred_sz( shred )
397 12016683 : - fd_shred_merkle_sz( shred->variant )
398 12016683 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
399 12016683 : }
400 :
401 : /* fd_shred_merkle_nodes: Returns a pointer to the shred's merkle proof data.
402 :
403 : The provided shred must have passed validation in fd_shred_parse(). */
404 : FD_FN_PURE static inline fd_shred_merkle_t const *
405 13707 : fd_shred_merkle_nodes( fd_shred_t const * shred ) {
406 13707 : uchar const * ptr = (uchar const *)shred;
407 13707 : ptr += fd_shred_merkle_off( shred );
408 13707 : return (fd_shred_merkle_t const *)ptr;
409 13707 : }
410 :
411 : /* fd_shred_merkle_root: Assuming that `shred` is a Merkle variant,
412 : reconstructs the merkle root from a shred and populates it in
413 : root_out. Returns 1 on success, 0 on failure. The output value must
414 : be ignored if a failure is returned. U.B. if the shred is not a
415 : merkle variant. */
416 : int
417 : fd_shred_merkle_root( fd_shred_t const * shred, void * bmtree_mem, fd_bmtree_node_t * root_out );
418 :
419 : /* fd_shred_data_payload: Returns a pointer to a data shred payload.
420 :
421 : The provided shred must have passed validation in fd_shred_parse(),
422 : and must satisfy `type&FD_SHRED_TYPEMASK_DATA`
423 : where `uchar type = fd_shred_type( shred->variant )`. */
424 : FD_FN_CONST static inline uchar const *
425 132 : fd_shred_data_payload( fd_shred_t const * shred ) {
426 132 : return (uchar const *)shred + FD_SHRED_DATA_HEADER_SZ;
427 132 : }
428 :
429 : /* fd_shred_code_payload: Returns a pointer to a coding shred payload.
430 :
431 : The provided shred must have passed validation in fd_shred_parse(),
432 : and must satisfy `type&FD_SHRED_TYPEMASK_CODE`
433 : where `uchar type = fd_shred_type( shred->variant )`. */
434 : FD_FN_CONST static inline uchar const *
435 0 : fd_shred_code_payload( fd_shred_t const * shred ) {
436 0 : return (uchar const *)shred + FD_SHRED_CODE_HEADER_SZ;
437 0 : }
438 :
439 : /* fd_shred_chain_offset: Assuming that `shred` is a chained Merkle
440 : variant, compute the offset from the start of the shred to the start
441 : of the chained Merkle root. U.B. if the shred is not a chained
442 : variant. */
443 : FD_FN_CONST static inline ulong
444 12030789 : fd_shred_chain_off( uchar variant ) {
445 12030789 : ulong type = fd_shred_type( variant );
446 12030789 : return fd_ulong_if( type & FD_SHRED_TYPEMASK_CODE, FD_SHRED_MAX_SZ, FD_SHRED_MIN_SZ )
447 12030789 : - FD_SHRED_MERKLE_ROOT_SZ
448 12030789 : - fd_shred_merkle_sz( variant )
449 12030789 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
450 12030789 : }
451 :
452 : /* fd_shred_retrasmitter_sig_off: Assuming that `shred` is a resigned
453 : variant, compute the offset from the start of the shred to the start
454 : of the retransmitter signature. U.B if the shred is not a resigned
455 : chained type. */
456 : FD_FN_PURE static inline ulong
457 2745795 : fd_shred_retransmitter_sig_off( fd_shred_t const * shred ) {
458 2745795 : return fd_shred_sz( shred )-FD_SHRED_SIGNATURE_SZ;
459 2745795 : }
460 :
461 : FD_PROTOTYPES_END
462 :
463 : #endif /* HEADER_fd_src_ballet_shred_fd_shred_h */
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