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dep: Add zstd

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This commit is contained in:
Connor McLaughlin
2022-08-18 19:30:13 +10:00
parent 60b95830cd
commit fc770c83e8
67 changed files with 42290 additions and 0 deletions
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1889
dep/zstd/lib/decompress/huf_decompress.c Normal file
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dep/zstd/lib/decompress/huf_decompress_amd64.S Normal file
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/*
* Copyright (c) Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
#include "../common/portability_macros.h"
/* Stack marking
* ref: https://wiki.gentoo.org/wiki/Hardened/GNU_stack_quickstart
*/
#if defined(__ELF__) && defined(__GNUC__)
.section .note.GNU-stack,"",%progbits
#endif
#if ZSTD_ENABLE_ASM_X86_64_BMI2
/* Calling convention:
*
* %rdi contains the first argument: HUF_DecompressAsmArgs*.
* %rbp isn't maintained (no frame pointer).
* %rsp contains the stack pointer that grows down.
* No red-zone is assumed, only addresses >= %rsp are used.
* All register contents are preserved.
*
* TODO: Support Windows calling convention.
*/
ZSTD_HIDE_ASM_FUNCTION(HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop)
ZSTD_HIDE_ASM_FUNCTION(HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop)
ZSTD_HIDE_ASM_FUNCTION(_HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop)
ZSTD_HIDE_ASM_FUNCTION(_HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop)
.global HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop
.global HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop
.global _HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop
.global _HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop
.text
/* Sets up register mappings for clarity.
* op[], bits[], dtable & ip[0] each get their own register.
* ip[1,2,3] & olimit alias var[].
* %rax is a scratch register.
*/
#define op0 rsi
#define op1 rbx
#define op2 rcx
#define op3 rdi
#define ip0 r8
#define ip1 r9
#define ip2 r10
#define ip3 r11
#define bits0 rbp
#define bits1 rdx
#define bits2 r12
#define bits3 r13
#define dtable r14
#define olimit r15
/* var[] aliases ip[1,2,3] & olimit
* ip[1,2,3] are saved every iteration.
* olimit is only used in compute_olimit.
*/
#define var0 r15
#define var1 r9
#define var2 r10
#define var3 r11
/* 32-bit var registers */
#define vard0 r15d
#define vard1 r9d
#define vard2 r10d
#define vard3 r11d
/* Calls X(N) for each stream 0, 1, 2, 3. */
#define FOR_EACH_STREAM(X) \
X(0); \
X(1); \
X(2); \
X(3)
/* Calls X(N, idx) for each stream 0, 1, 2, 3. */
#define FOR_EACH_STREAM_WITH_INDEX(X, idx) \
X(0, idx); \
X(1, idx); \
X(2, idx); \
X(3, idx)
/* Define both _HUF_* & HUF_* symbols because MacOS
* C symbols are prefixed with '_' & Linux symbols aren't.
*/
_HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop:
HUF_decompress4X1_usingDTable_internal_bmi2_asm_loop:
/* Save all registers - even if they are callee saved for simplicity. */
push %rax
push %rbx
push %rcx
push %rdx
push %rbp
push %rsi
push %rdi
push %r8
push %r9
push %r10
push %r11
push %r12
push %r13
push %r14
push %r15
/* Read HUF_DecompressAsmArgs* args from %rax */
movq %rdi, %rax
movq 0(%rax), %ip0
movq 8(%rax), %ip1
movq 16(%rax), %ip2
movq 24(%rax), %ip3
movq 32(%rax), %op0
movq 40(%rax), %op1
movq 48(%rax), %op2
movq 56(%rax), %op3
movq 64(%rax), %bits0
movq 72(%rax), %bits1
movq 80(%rax), %bits2
movq 88(%rax), %bits3
movq 96(%rax), %dtable
push %rax /* argument */
push 104(%rax) /* ilimit */
push 112(%rax) /* oend */
push %olimit /* olimit space */
subq $24, %rsp
.L_4X1_compute_olimit:
/* Computes how many iterations we can do safely
* %r15, %rax may be clobbered
* rbx, rdx must be saved
* op3 & ip0 mustn't be clobbered
*/
movq %rbx, 0(%rsp)
movq %rdx, 8(%rsp)
movq 32(%rsp), %rax /* rax = oend */
subq %op3, %rax /* rax = oend - op3 */
/* r15 = (oend - op3) / 5 */
movabsq $-3689348814741910323, %rdx
mulq %rdx
movq %rdx, %r15
shrq $2, %r15
movq %ip0, %rax /* rax = ip0 */
movq 40(%rsp), %rdx /* rdx = ilimit */
subq %rdx, %rax /* rax = ip0 - ilimit */
movq %rax, %rbx /* rbx = ip0 - ilimit */
/* rdx = (ip0 - ilimit) / 7 */
movabsq $2635249153387078803, %rdx
mulq %rdx
subq %rdx, %rbx
shrq %rbx
addq %rbx, %rdx
shrq $2, %rdx
/* r15 = min(%rdx, %r15) */
cmpq %rdx, %r15
cmova %rdx, %r15
/* r15 = r15 * 5 */
leaq (%r15, %r15, 4), %r15
/* olimit = op3 + r15 */
addq %op3, %olimit
movq 8(%rsp), %rdx
movq 0(%rsp), %rbx
/* If (op3 + 20 > olimit) */
movq %op3, %rax /* rax = op3 */
addq $20, %rax /* rax = op3 + 20 */
cmpq %rax, %olimit /* op3 + 20 > olimit */
jb .L_4X1_exit
/* If (ip1 < ip0) go to exit */
cmpq %ip0, %ip1
jb .L_4X1_exit
/* If (ip2 < ip1) go to exit */
cmpq %ip1, %ip2
jb .L_4X1_exit
/* If (ip3 < ip2) go to exit */
cmpq %ip2, %ip3
jb .L_4X1_exit
/* Reads top 11 bits from bits[n]
* Loads dt[bits[n]] into var[n]
*/
#define GET_NEXT_DELT(n) \
movq $53, %var##n; \
shrxq %var##n, %bits##n, %var##n; \
movzwl (%dtable,%var##n,2),%vard##n
/* var[n] must contain the DTable entry computed with GET_NEXT_DELT
* Moves var[n] to %rax
* bits[n] <<= var[n] & 63
* op[n][idx] = %rax >> 8
* %ah is a way to access bits [8, 16) of %rax
*/
#define DECODE_FROM_DELT(n, idx) \
movq %var##n, %rax; \
shlxq %var##n, %bits##n, %bits##n; \
movb %ah, idx(%op##n)
/* Assumes GET_NEXT_DELT has been called.
* Calls DECODE_FROM_DELT then GET_NEXT_DELT
*/
#define DECODE_AND_GET_NEXT(n, idx) \
DECODE_FROM_DELT(n, idx); \
GET_NEXT_DELT(n) \
/* // ctz & nbBytes is stored in bits[n]
* // nbBits is stored in %rax
* ctz = CTZ[bits[n]]
* nbBits = ctz & 7
* nbBytes = ctz >> 3
* op[n] += 5
* ip[n] -= nbBytes
* // Note: x86-64 is little-endian ==> no bswap
* bits[n] = MEM_readST(ip[n]) | 1
* bits[n] <<= nbBits
*/
#define RELOAD_BITS(n) \
bsfq %bits##n, %bits##n; \
movq %bits##n, %rax; \
andq $7, %rax; \
shrq $3, %bits##n; \
leaq 5(%op##n), %op##n; \
subq %bits##n, %ip##n; \
movq (%ip##n), %bits##n; \
orq $1, %bits##n; \
shlx %rax, %bits##n, %bits##n
/* Store clobbered variables on the stack */
movq %olimit, 24(%rsp)
movq %ip1, 0(%rsp)
movq %ip2, 8(%rsp)
movq %ip3, 16(%rsp)
/* Call GET_NEXT_DELT for each stream */
FOR_EACH_STREAM(GET_NEXT_DELT)
.p2align 6
.L_4X1_loop_body:
/* Decode 5 symbols in each of the 4 streams (20 total)
* Must have called GET_NEXT_DELT for each stream
*/
FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 0)
FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 1)
FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 2)
FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 3)
FOR_EACH_STREAM_WITH_INDEX(DECODE_FROM_DELT, 4)
/* Load ip[1,2,3] from stack (var[] aliases them)
* ip[] is needed for RELOAD_BITS
* Each will be stored back to the stack after RELOAD
*/
movq 0(%rsp), %ip1
movq 8(%rsp), %ip2
movq 16(%rsp), %ip3
/* Reload each stream & fetch the next table entry
* to prepare for the next iteration
*/
RELOAD_BITS(0)
GET_NEXT_DELT(0)
RELOAD_BITS(1)
movq %ip1, 0(%rsp)
GET_NEXT_DELT(1)
RELOAD_BITS(2)
movq %ip2, 8(%rsp)
GET_NEXT_DELT(2)
RELOAD_BITS(3)
movq %ip3, 16(%rsp)
GET_NEXT_DELT(3)
/* If op3 < olimit: continue the loop */
cmp %op3, 24(%rsp)
ja .L_4X1_loop_body
/* Reload ip[1,2,3] from stack */
movq 0(%rsp), %ip1
movq 8(%rsp), %ip2
movq 16(%rsp), %ip3
/* Re-compute olimit */
jmp .L_4X1_compute_olimit
#undef GET_NEXT_DELT
#undef DECODE_FROM_DELT
#undef DECODE
#undef RELOAD_BITS
.L_4X1_exit:
addq $24, %rsp
/* Restore stack (oend & olimit) */
pop %rax /* olimit */
pop %rax /* oend */
pop %rax /* ilimit */
pop %rax /* arg */
/* Save ip / op / bits */
movq %ip0, 0(%rax)
movq %ip1, 8(%rax)
movq %ip2, 16(%rax)
movq %ip3, 24(%rax)
movq %op0, 32(%rax)
movq %op1, 40(%rax)
movq %op2, 48(%rax)
movq %op3, 56(%rax)
movq %bits0, 64(%rax)
movq %bits1, 72(%rax)
movq %bits2, 80(%rax)
movq %bits3, 88(%rax)
/* Restore registers */
pop %r15
pop %r14
pop %r13
pop %r12
pop %r11
pop %r10
pop %r9
pop %r8
pop %rdi
pop %rsi
pop %rbp
pop %rdx
pop %rcx
pop %rbx
pop %rax
ret
_HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop:
HUF_decompress4X2_usingDTable_internal_bmi2_asm_loop:
/* Save all registers - even if they are callee saved for simplicity. */
push %rax
push %rbx
push %rcx
push %rdx
push %rbp
push %rsi
push %rdi
push %r8
push %r9
push %r10
push %r11
push %r12
push %r13
push %r14
push %r15
movq %rdi, %rax
movq 0(%rax), %ip0
movq 8(%rax), %ip1
movq 16(%rax), %ip2
movq 24(%rax), %ip3
movq 32(%rax), %op0
movq 40(%rax), %op1
movq 48(%rax), %op2
movq 56(%rax), %op3
movq 64(%rax), %bits0
movq 72(%rax), %bits1
movq 80(%rax), %bits2
movq 88(%rax), %bits3
movq 96(%rax), %dtable
push %rax /* argument */
push %rax /* olimit */
push 104(%rax) /* ilimit */
movq 112(%rax), %rax
push %rax /* oend3 */
movq %op3, %rax
push %rax /* oend2 */
movq %op2, %rax
push %rax /* oend1 */
movq %op1, %rax
push %rax /* oend0 */
/* Scratch space */
subq $8, %rsp
.L_4X2_compute_olimit:
/* Computes how many iterations we can do safely
* %r15, %rax may be clobbered
* rdx must be saved
* op[1,2,3,4] & ip0 mustn't be clobbered
*/
movq %rdx, 0(%rsp)
/* We can consume up to 7 input bytes each iteration. */
movq %ip0, %rax /* rax = ip0 */
movq 40(%rsp), %rdx /* rdx = ilimit */
subq %rdx, %rax /* rax = ip0 - ilimit */
movq %rax, %r15 /* r15 = ip0 - ilimit */
/* rdx = rax / 7 */
movabsq $2635249153387078803, %rdx
mulq %rdx
subq %rdx, %r15
shrq %r15
addq %r15, %rdx
shrq $2, %rdx
/* r15 = (ip0 - ilimit) / 7 */
movq %rdx, %r15
movabsq $-3689348814741910323, %rdx
movq 8(%rsp), %rax /* rax = oend0 */
subq %op0, %rax /* rax = oend0 - op0 */
mulq %rdx
shrq $3, %rdx /* rdx = rax / 10 */
/* r15 = min(%rdx, %r15) */
cmpq %rdx, %r15
cmova %rdx, %r15
movabsq $-3689348814741910323, %rdx
movq 16(%rsp), %rax /* rax = oend1 */
subq %op1, %rax /* rax = oend1 - op1 */
mulq %rdx
shrq $3, %rdx /* rdx = rax / 10 */
/* r15 = min(%rdx, %r15) */
cmpq %rdx, %r15
cmova %rdx, %r15
movabsq $-3689348814741910323, %rdx
movq 24(%rsp), %rax /* rax = oend2 */
subq %op2, %rax /* rax = oend2 - op2 */
mulq %rdx
shrq $3, %rdx /* rdx = rax / 10 */
/* r15 = min(%rdx, %r15) */
cmpq %rdx, %r15
cmova %rdx, %r15
movabsq $-3689348814741910323, %rdx
movq 32(%rsp), %rax /* rax = oend3 */
subq %op3, %rax /* rax = oend3 - op3 */
mulq %rdx
shrq $3, %rdx /* rdx = rax / 10 */
/* r15 = min(%rdx, %r15) */
cmpq %rdx, %r15
cmova %rdx, %r15
/* olimit = op3 + 5 * r15 */
movq %r15, %rax
leaq (%op3, %rax, 4), %olimit
addq %rax, %olimit
movq 0(%rsp), %rdx
/* If (op3 + 10 > olimit) */
movq %op3, %rax /* rax = op3 */
addq $10, %rax /* rax = op3 + 10 */
cmpq %rax, %olimit /* op3 + 10 > olimit */
jb .L_4X2_exit
/* If (ip1 < ip0) go to exit */
cmpq %ip0, %ip1
jb .L_4X2_exit
/* If (ip2 < ip1) go to exit */
cmpq %ip1, %ip2
jb .L_4X2_exit
/* If (ip3 < ip2) go to exit */
cmpq %ip2, %ip3
jb .L_4X2_exit
#define DECODE(n, idx) \
movq %bits##n, %rax; \
shrq $53, %rax; \
movzwl 0(%dtable,%rax,4),%r8d; \
movzbl 2(%dtable,%rax,4),%r15d; \
movzbl 3(%dtable,%rax,4),%eax; \
movw %r8w, (%op##n); \
shlxq %r15, %bits##n, %bits##n; \
addq %rax, %op##n
#define RELOAD_BITS(n) \
bsfq %bits##n, %bits##n; \
movq %bits##n, %rax; \
shrq $3, %bits##n; \
andq $7, %rax; \
subq %bits##n, %ip##n; \
movq (%ip##n), %bits##n; \
orq $1, %bits##n; \
shlxq %rax, %bits##n, %bits##n
movq %olimit, 48(%rsp)
.p2align 6
.L_4X2_loop_body:
/* We clobber r8, so store it on the stack */
movq %r8, 0(%rsp)
/* Decode 5 symbols from each of the 4 streams (20 symbols total). */
FOR_EACH_STREAM_WITH_INDEX(DECODE, 0)
FOR_EACH_STREAM_WITH_INDEX(DECODE, 1)
FOR_EACH_STREAM_WITH_INDEX(DECODE, 2)
FOR_EACH_STREAM_WITH_INDEX(DECODE, 3)
FOR_EACH_STREAM_WITH_INDEX(DECODE, 4)
/* Reload r8 */
movq 0(%rsp), %r8
FOR_EACH_STREAM(RELOAD_BITS)
cmp %op3, 48(%rsp)
ja .L_4X2_loop_body
jmp .L_4X2_compute_olimit
#undef DECODE
#undef RELOAD_BITS
.L_4X2_exit:
addq $8, %rsp
/* Restore stack (oend & olimit) */
pop %rax /* oend0 */
pop %rax /* oend1 */
pop %rax /* oend2 */
pop %rax /* oend3 */
pop %rax /* ilimit */
pop %rax /* olimit */
pop %rax /* arg */
/* Save ip / op / bits */
movq %ip0, 0(%rax)
movq %ip1, 8(%rax)
movq %ip2, 16(%rax)
movq %ip3, 24(%rax)
movq %op0, 32(%rax)
movq %op1, 40(%rax)
movq %op2, 48(%rax)
movq %op3, 56(%rax)
movq %bits0, 64(%rax)
movq %bits1, 72(%rax)
movq %bits2, 80(%rax)
movq %bits3, 88(%rax)
/* Restore registers */
pop %r15
pop %r14
pop %r13
pop %r12
pop %r11
pop %r10
pop %r9
pop %r8
pop %rdi
pop %rsi
pop %rbp
pop %rdx
pop %rcx
pop %rbx
pop %rax
ret
#endif

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dep/zstd/lib/decompress/zstd_ddict.c Normal file
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/*
* Copyright (c) Yann Collet, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
/* zstd_ddict.c :
* concentrates all logic that needs to know the internals of ZSTD_DDict object */
/*-*******************************************************
* Dependencies
*********************************************************/
#include "../common/zstd_deps.h" /* ZSTD_memcpy, ZSTD_memmove, ZSTD_memset */
#include "../common/cpu.h" /* bmi2 */
#include "../common/mem.h" /* low level memory routines */
#define FSE_STATIC_LINKING_ONLY
#include "../common/fse.h"
#define HUF_STATIC_LINKING_ONLY
#include "../common/huf.h"
#include "zstd_decompress_internal.h"
#include "zstd_ddict.h"
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
# include "../legacy/zstd_legacy.h"
#endif
/*-*******************************************************
* Types
*********************************************************/
struct ZSTD_DDict_s {
void* dictBuffer;
const void* dictContent;
size_t dictSize;
ZSTD_entropyDTables_t entropy;
U32 dictID;
U32 entropyPresent;
ZSTD_customMem cMem;
}; /* typedef'd to ZSTD_DDict within "zstd.h" */
const void* ZSTD_DDict_dictContent(const ZSTD_DDict* ddict)
{
assert(ddict != NULL);
return ddict->dictContent;
}
size_t ZSTD_DDict_dictSize(const ZSTD_DDict* ddict)
{
assert(ddict != NULL);
return ddict->dictSize;
}
void ZSTD_copyDDictParameters(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict)
{
DEBUGLOG(4, "ZSTD_copyDDictParameters");
assert(dctx != NULL);
assert(ddict != NULL);
dctx->dictID = ddict->dictID;
dctx->prefixStart = ddict->dictContent;
dctx->virtualStart = ddict->dictContent;
dctx->dictEnd = (const BYTE*)ddict->dictContent + ddict->dictSize;
dctx->previousDstEnd = dctx->dictEnd;
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
dctx->dictContentBeginForFuzzing = dctx->prefixStart;
dctx->dictContentEndForFuzzing = dctx->previousDstEnd;
#endif
if (ddict->entropyPresent) {
dctx->litEntropy = 1;
dctx->fseEntropy = 1;
dctx->LLTptr = ddict->entropy.LLTable;
dctx->MLTptr = ddict->entropy.MLTable;
dctx->OFTptr = ddict->entropy.OFTable;
dctx->HUFptr = ddict->entropy.hufTable;
dctx->entropy.rep[0] = ddict->entropy.rep[0];
dctx->entropy.rep[1] = ddict->entropy.rep[1];
dctx->entropy.rep[2] = ddict->entropy.rep[2];
} else {
dctx->litEntropy = 0;
dctx->fseEntropy = 0;
}
}
static size_t
ZSTD_loadEntropy_intoDDict(ZSTD_DDict* ddict,
ZSTD_dictContentType_e dictContentType)
{
ddict->dictID = 0;
ddict->entropyPresent = 0;
if (dictContentType == ZSTD_dct_rawContent) return 0;
if (ddict->dictSize < 8) {
if (dictContentType == ZSTD_dct_fullDict)
return ERROR(dictionary_corrupted); /* only accept specified dictionaries */
return 0; /* pure content mode */
}
{ U32 const magic = MEM_readLE32(ddict->dictContent);
if (magic != ZSTD_MAGIC_DICTIONARY) {
if (dictContentType == ZSTD_dct_fullDict)
return ERROR(dictionary_corrupted); /* only accept specified dictionaries */
return 0; /* pure content mode */
}
}
ddict->dictID = MEM_readLE32((const char*)ddict->dictContent + ZSTD_FRAMEIDSIZE);
/* load entropy tables */
RETURN_ERROR_IF(ZSTD_isError(ZSTD_loadDEntropy(
&ddict->entropy, ddict->dictContent, ddict->dictSize)),
dictionary_corrupted, "");
ddict->entropyPresent = 1;
return 0;
}
static size_t ZSTD_initDDict_internal(ZSTD_DDict* ddict,
const void* dict, size_t dictSize,
ZSTD_dictLoadMethod_e dictLoadMethod,
ZSTD_dictContentType_e dictContentType)
{
if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dict) || (!dictSize)) {
ddict->dictBuffer = NULL;
ddict->dictContent = dict;
if (!dict) dictSize = 0;
} else {
void* const internalBuffer = ZSTD_customMalloc(dictSize, ddict->cMem);
ddict->dictBuffer = internalBuffer;
ddict->dictContent = internalBuffer;
if (!internalBuffer) return ERROR(memory_allocation);
ZSTD_memcpy(internalBuffer, dict, dictSize);
}
ddict->dictSize = dictSize;
ddict->entropy.hufTable[0] = (HUF_DTable)((HufLog)*0x1000001); /* cover both little and big endian */
/* parse dictionary content */
FORWARD_IF_ERROR( ZSTD_loadEntropy_intoDDict(ddict, dictContentType) , "");
return 0;
}
ZSTD_DDict* ZSTD_createDDict_advanced(const void* dict, size_t dictSize,
ZSTD_dictLoadMethod_e dictLoadMethod,
ZSTD_dictContentType_e dictContentType,
ZSTD_customMem customMem)
{
if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
{ ZSTD_DDict* const ddict = (ZSTD_DDict*) ZSTD_customMalloc(sizeof(ZSTD_DDict), customMem);
if (ddict == NULL) return NULL;
ddict->cMem = customMem;
{ size_t const initResult = ZSTD_initDDict_internal(ddict,
dict, dictSize,
dictLoadMethod, dictContentType);
if (ZSTD_isError(initResult)) {
ZSTD_freeDDict(ddict);
return NULL;
} }
return ddict;
}
}
/*! ZSTD_createDDict() :
* Create a digested dictionary, to start decompression without startup delay.
* `dict` content is copied inside DDict.
* Consequently, `dict` can be released after `ZSTD_DDict` creation */
ZSTD_DDict* ZSTD_createDDict(const void* dict, size_t dictSize)
{
ZSTD_customMem const allocator = { NULL, NULL, NULL };
return ZSTD_createDDict_advanced(dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto, allocator);
}
/*! ZSTD_createDDict_byReference() :
* Create a digested dictionary, to start decompression without startup delay.
* Dictionary content is simply referenced, it will be accessed during decompression.
* Warning : dictBuffer must outlive DDict (DDict must be freed before dictBuffer) */
ZSTD_DDict* ZSTD_createDDict_byReference(const void* dictBuffer, size_t dictSize)
{
ZSTD_customMem const allocator = { NULL, NULL, NULL };
return ZSTD_createDDict_advanced(dictBuffer, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto, allocator);
}
const ZSTD_DDict* ZSTD_initStaticDDict(
void* sBuffer, size_t sBufferSize,
const void* dict, size_t dictSize,
ZSTD_dictLoadMethod_e dictLoadMethod,
ZSTD_dictContentType_e dictContentType)
{
size_t const neededSpace = sizeof(ZSTD_DDict)
+ (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize);
ZSTD_DDict* const ddict = (ZSTD_DDict*)sBuffer;
assert(sBuffer != NULL);
assert(dict != NULL);
if ((size_t)sBuffer & 7) return NULL; /* 8-aligned */
if (sBufferSize < neededSpace) return NULL;
if (dictLoadMethod == ZSTD_dlm_byCopy) {
ZSTD_memcpy(ddict+1, dict, dictSize); /* local copy */
dict = ddict+1;
}
if (ZSTD_isError( ZSTD_initDDict_internal(ddict,
dict, dictSize,
ZSTD_dlm_byRef, dictContentType) ))
return NULL;
return ddict;
}
size_t ZSTD_freeDDict(ZSTD_DDict* ddict)
{
if (ddict==NULL) return 0; /* support free on NULL */
{ ZSTD_customMem const cMem = ddict->cMem;
ZSTD_customFree(ddict->dictBuffer, cMem);
ZSTD_customFree(ddict, cMem);
return 0;
}
}
/*! ZSTD_estimateDDictSize() :
* Estimate amount of memory that will be needed to create a dictionary for decompression.
* Note : dictionary created by reference using ZSTD_dlm_byRef are smaller */
size_t ZSTD_estimateDDictSize(size_t dictSize, ZSTD_dictLoadMethod_e dictLoadMethod)
{
return sizeof(ZSTD_DDict) + (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize);
}
size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict)
{
if (ddict==NULL) return 0; /* support sizeof on NULL */
return sizeof(*ddict) + (ddict->dictBuffer ? ddict->dictSize : 0) ;
}
/*! ZSTD_getDictID_fromDDict() :
* Provides the dictID of the dictionary loaded into `ddict`.
* If @return == 0, the dictionary is not conformant to Zstandard specification, or empty.
* Non-conformant dictionaries can still be loaded, but as content-only dictionaries. */
unsigned ZSTD_getDictID_fromDDict(const ZSTD_DDict* ddict)
{
if (ddict==NULL) return 0;
return ZSTD_getDictID_fromDict(ddict->dictContent, ddict->dictSize);
}

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/*
* Copyright (c) Yann Collet, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
#ifndef ZSTD_DDICT_H
#define ZSTD_DDICT_H
/*-*******************************************************
* Dependencies
*********************************************************/
#include "../common/zstd_deps.h" /* size_t */
#include "../zstd.h" /* ZSTD_DDict, and several public functions */
/*-*******************************************************
* Interface
*********************************************************/
/* note: several prototypes are already published in `zstd.h` :
* ZSTD_createDDict()
* ZSTD_createDDict_byReference()
* ZSTD_createDDict_advanced()
* ZSTD_freeDDict()
* ZSTD_initStaticDDict()
* ZSTD_sizeof_DDict()
* ZSTD_estimateDDictSize()
* ZSTD_getDictID_fromDict()
*/
const void* ZSTD_DDict_dictContent(const ZSTD_DDict* ddict);
size_t ZSTD_DDict_dictSize(const ZSTD_DDict* ddict);
void ZSTD_copyDDictParameters(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict);
#endif /* ZSTD_DDICT_H */

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/*
* Copyright (c) Yann Collet, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
#ifndef ZSTD_DEC_BLOCK_H
#define ZSTD_DEC_BLOCK_H
/*-*******************************************************
* Dependencies
*********************************************************/
#include "../common/zstd_deps.h" /* size_t */
#include "../zstd.h" /* DCtx, and some public functions */
#include "../common/zstd_internal.h" /* blockProperties_t, and some public functions */
#include "zstd_decompress_internal.h" /* ZSTD_seqSymbol */
/* === Prototypes === */
/* note: prototypes already published within `zstd.h` :
* ZSTD_decompressBlock()
*/
/* note: prototypes already published within `zstd_internal.h` :
* ZSTD_getcBlockSize()
* ZSTD_decodeSeqHeaders()
*/
/* Streaming state is used to inform allocation of the literal buffer */
typedef enum {
not_streaming = 0,
is_streaming = 1
} streaming_operation;
/* ZSTD_decompressBlock_internal() :
* decompress block, starting at `src`,
* into destination buffer `dst`.
* @return : decompressed block size,
* or an error code (which can be tested using ZSTD_isError())
*/
size_t ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize, const int frame, const streaming_operation streaming);
/* ZSTD_buildFSETable() :
* generate FSE decoding table for one symbol (ll, ml or off)
* this function must be called with valid parameters only
* (dt is large enough, normalizedCounter distribution total is a power of 2, max is within range, etc.)
* in which case it cannot fail.
* The workspace must be 4-byte aligned and at least ZSTD_BUILD_FSE_TABLE_WKSP_SIZE bytes, which is
* defined in zstd_decompress_internal.h.
* Internal use only.
*/
void ZSTD_buildFSETable(ZSTD_seqSymbol* dt,
const short* normalizedCounter, unsigned maxSymbolValue,
const U32* baseValue, const U8* nbAdditionalBits,
unsigned tableLog, void* wksp, size_t wkspSize,
int bmi2);
#endif /* ZSTD_DEC_BLOCK_H */

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/*
* Copyright (c) Yann Collet, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
/* zstd_decompress_internal:
* objects and definitions shared within lib/decompress modules */
#ifndef ZSTD_DECOMPRESS_INTERNAL_H
#define ZSTD_DECOMPRESS_INTERNAL_H
/*-*******************************************************
* Dependencies
*********************************************************/
#include "../common/mem.h" /* BYTE, U16, U32 */
#include "../common/zstd_internal.h" /* constants : MaxLL, MaxML, MaxOff, LLFSELog, etc. */
/*-*******************************************************
* Constants
*********************************************************/
static UNUSED_ATTR const U32 LL_base[MaxLL+1] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 18, 20, 22, 24, 28, 32, 40,
48, 64, 0x80, 0x100, 0x200, 0x400, 0x800, 0x1000,
0x2000, 0x4000, 0x8000, 0x10000 };
static UNUSED_ATTR const U32 OF_base[MaxOff+1] = {
0, 1, 1, 5, 0xD, 0x1D, 0x3D, 0x7D,
0xFD, 0x1FD, 0x3FD, 0x7FD, 0xFFD, 0x1FFD, 0x3FFD, 0x7FFD,
0xFFFD, 0x1FFFD, 0x3FFFD, 0x7FFFD, 0xFFFFD, 0x1FFFFD, 0x3FFFFD, 0x7FFFFD,
0xFFFFFD, 0x1FFFFFD, 0x3FFFFFD, 0x7FFFFFD, 0xFFFFFFD, 0x1FFFFFFD, 0x3FFFFFFD, 0x7FFFFFFD };
static UNUSED_ATTR const U8 OF_bits[MaxOff+1] = {
0, 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 };
static UNUSED_ATTR const U32 ML_base[MaxML+1] = {
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, 37, 39, 41, 43, 47, 51, 59,
67, 83, 99, 0x83, 0x103, 0x203, 0x403, 0x803,
0x1003, 0x2003, 0x4003, 0x8003, 0x10003 };
/*-*******************************************************
* Decompression types
*********************************************************/
typedef struct {
U32 fastMode;
U32 tableLog;
} ZSTD_seqSymbol_header;
typedef struct {
U16 nextState;
BYTE nbAdditionalBits;
BYTE nbBits;
U32 baseValue;
} ZSTD_seqSymbol;
#define SEQSYMBOL_TABLE_SIZE(log) (1 + (1 << (log)))
#define ZSTD_BUILD_FSE_TABLE_WKSP_SIZE (sizeof(S16) * (MaxSeq + 1) + (1u << MaxFSELog) + sizeof(U64))
#define ZSTD_BUILD_FSE_TABLE_WKSP_SIZE_U32 ((ZSTD_BUILD_FSE_TABLE_WKSP_SIZE + sizeof(U32) - 1) / sizeof(U32))
typedef struct {
ZSTD_seqSymbol LLTable[SEQSYMBOL_TABLE_SIZE(LLFSELog)]; /* Note : Space reserved for FSE Tables */
ZSTD_seqSymbol OFTable[SEQSYMBOL_TABLE_SIZE(OffFSELog)]; /* is also used as temporary workspace while building hufTable during DDict creation */
ZSTD_seqSymbol MLTable[SEQSYMBOL_TABLE_SIZE(MLFSELog)]; /* and therefore must be at least HUF_DECOMPRESS_WORKSPACE_SIZE large */
HUF_DTable hufTable[HUF_DTABLE_SIZE(HufLog)]; /* can accommodate HUF_decompress4X */
U32 rep[ZSTD_REP_NUM];
U32 workspace[ZSTD_BUILD_FSE_TABLE_WKSP_SIZE_U32];
} ZSTD_entropyDTables_t;
typedef enum { ZSTDds_getFrameHeaderSize, ZSTDds_decodeFrameHeader,
ZSTDds_decodeBlockHeader, ZSTDds_decompressBlock,
ZSTDds_decompressLastBlock, ZSTDds_checkChecksum,
ZSTDds_decodeSkippableHeader, ZSTDds_skipFrame } ZSTD_dStage;
typedef enum { zdss_init=0, zdss_loadHeader,
zdss_read, zdss_load, zdss_flush } ZSTD_dStreamStage;
typedef enum {
ZSTD_use_indefinitely = -1, /* Use the dictionary indefinitely */
ZSTD_dont_use = 0, /* Do not use the dictionary (if one exists free it) */
ZSTD_use_once = 1 /* Use the dictionary once and set to ZSTD_dont_use */
} ZSTD_dictUses_e;
/* Hashset for storing references to multiple ZSTD_DDict within ZSTD_DCtx */
typedef struct {
const ZSTD_DDict** ddictPtrTable;
size_t ddictPtrTableSize;
size_t ddictPtrCount;
} ZSTD_DDictHashSet;
#ifndef ZSTD_DECODER_INTERNAL_BUFFER
# define ZSTD_DECODER_INTERNAL_BUFFER (1 << 16)
#endif
#define ZSTD_LBMIN 64
#define ZSTD_LBMAX (128 << 10)
/* extra buffer, compensates when dst is not large enough to store litBuffer */
#define ZSTD_LITBUFFEREXTRASIZE BOUNDED(ZSTD_LBMIN, ZSTD_DECODER_INTERNAL_BUFFER, ZSTD_LBMAX)
typedef enum {
ZSTD_not_in_dst = 0, /* Stored entirely within litExtraBuffer */
ZSTD_in_dst = 1, /* Stored entirely within dst (in memory after current output write) */
ZSTD_split = 2 /* Split between litExtraBuffer and dst */
} ZSTD_litLocation_e;
struct ZSTD_DCtx_s
{
const ZSTD_seqSymbol* LLTptr;
const ZSTD_seqSymbol* MLTptr;
const ZSTD_seqSymbol* OFTptr;
const HUF_DTable* HUFptr;
ZSTD_entropyDTables_t entropy;
U32 workspace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; /* space needed when building huffman tables */
const void* previousDstEnd; /* detect continuity */
const void* prefixStart; /* start of current segment */
const void* virtualStart; /* virtual start of previous segment if it was just before current one */
const void* dictEnd; /* end of previous segment */
size_t expected;
ZSTD_frameHeader fParams;
U64 processedCSize;
U64 decodedSize;
blockType_e bType; /* used in ZSTD_decompressContinue(), store blockType between block header decoding and block decompression stages */
ZSTD_dStage stage;
U32 litEntropy;
U32 fseEntropy;
XXH64_state_t xxhState;
size_t headerSize;
ZSTD_format_e format;
ZSTD_forceIgnoreChecksum_e forceIgnoreChecksum; /* User specified: if == 1, will ignore checksums in compressed frame. Default == 0 */
U32 validateChecksum; /* if == 1, will validate checksum. Is == 1 if (fParams.checksumFlag == 1) and (forceIgnoreChecksum == 0). */
const BYTE* litPtr;
ZSTD_customMem customMem;
size_t litSize;
size_t rleSize;
size_t staticSize;
#if DYNAMIC_BMI2 != 0
int bmi2; /* == 1 if the CPU supports BMI2 and 0 otherwise. CPU support is determined dynamically once per context lifetime. */
#endif
/* dictionary */
ZSTD_DDict* ddictLocal;
const ZSTD_DDict* ddict; /* set by ZSTD_initDStream_usingDDict(), or ZSTD_DCtx_refDDict() */
U32 dictID;
int ddictIsCold; /* if == 1 : dictionary is "new" for working context, and presumed "cold" (not in cpu cache) */
ZSTD_dictUses_e dictUses;
ZSTD_DDictHashSet* ddictSet; /* Hash set for multiple ddicts */
ZSTD_refMultipleDDicts_e refMultipleDDicts; /* User specified: if == 1, will allow references to multiple DDicts. Default == 0 (disabled) */
/* streaming */
ZSTD_dStreamStage streamStage;
char* inBuff;
size_t inBuffSize;
size_t inPos;
size_t maxWindowSize;
char* outBuff;
size_t outBuffSize;
size_t outStart;
size_t outEnd;
size_t lhSize;
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
void* legacyContext;
U32 previousLegacyVersion;
U32 legacyVersion;
#endif
U32 hostageByte;
int noForwardProgress;
ZSTD_bufferMode_e outBufferMode;
ZSTD_outBuffer expectedOutBuffer;
/* workspace */
BYTE* litBuffer;
const BYTE* litBufferEnd;
ZSTD_litLocation_e litBufferLocation;
BYTE litExtraBuffer[ZSTD_LITBUFFEREXTRASIZE + WILDCOPY_OVERLENGTH]; /* literal buffer can be split between storage within dst and within this scratch buffer */
BYTE headerBuffer[ZSTD_FRAMEHEADERSIZE_MAX];
size_t oversizedDuration;
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
void const* dictContentBeginForFuzzing;
void const* dictContentEndForFuzzing;
#endif
/* Tracing */
#if ZSTD_TRACE
ZSTD_TraceCtx traceCtx;
#endif
}; /* typedef'd to ZSTD_DCtx within "zstd.h" */
MEM_STATIC int ZSTD_DCtx_get_bmi2(const struct ZSTD_DCtx_s *dctx) {
#if DYNAMIC_BMI2 != 0
return dctx->bmi2;
#else
(void)dctx;
return 0;
#endif
}
/*-*******************************************************
* Shared internal functions
*********************************************************/
/*! ZSTD_loadDEntropy() :
* dict : must point at beginning of a valid zstd dictionary.
* @return : size of dictionary header (size of magic number + dict ID + entropy tables) */
size_t ZSTD_loadDEntropy(ZSTD_entropyDTables_t* entropy,
const void* const dict, size_t const dictSize);
/*! ZSTD_checkContinuity() :
* check if next `dst` follows previous position, where decompression ended.
* If yes, do nothing (continue on current segment).
* If not, classify previous segment as "external dictionary", and start a new segment.
* This function cannot fail. */
void ZSTD_checkContinuity(ZSTD_DCtx* dctx, const void* dst, size_t dstSize);
#endif /* ZSTD_DECOMPRESS_INTERNAL_H */