repo sync | baa3858 | 2013-07-26 17:53:31 -0700 | [diff] [blame^] | 1 | /* XzDec.c -- Xz Decode
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| 2 | 2010-04-16 : Igor Pavlov : Public domain */
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| 3 |
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| 4 | /* #define XZ_DUMP */
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| 5 |
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| 6 | #ifdef XZ_DUMP
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| 7 | #include <stdio.h>
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| 8 | #endif
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| 9 |
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| 10 | #include <stdlib.h>
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| 11 | #include <string.h>
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| 12 |
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| 13 | #include "7zCrc.h"
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| 14 | #include "Alloc.h"
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| 15 | #include "Bra.h"
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| 16 | #include "CpuArch.h"
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| 17 | #include "Delta.h"
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| 18 | #include "Lzma2Dec.h"
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| 19 |
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| 20 | #ifdef USE_SUBBLOCK
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| 21 | #include "SbDec.h"
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| 22 | #endif
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| 23 |
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| 24 | #include "Xz.h"
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| 25 |
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| 26 | #define XZ_CHECK_SIZE_MAX 64
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| 27 |
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| 28 | #define CODER_BUF_SIZE (1 << 17)
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| 29 |
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| 30 | unsigned Xz_ReadVarInt(const Byte *p, size_t maxSize, UInt64 *value)
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| 31 | {
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| 32 | int i, limit;
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| 33 | *value = 0;
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| 34 | limit = (maxSize > 9) ? 9 : (int)maxSize;
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| 35 |
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| 36 | for (i = 0; i < limit;)
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| 37 | {
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| 38 | Byte b = p[i];
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| 39 | *value |= (UInt64)(b & 0x7F) << (7 * i++);
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| 40 | if ((b & 0x80) == 0)
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| 41 | return (b == 0 && i != 1) ? 0 : i;
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| 42 | }
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| 43 | return 0;
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| 44 | }
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| 45 |
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| 46 | /* ---------- BraState ---------- */
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| 47 |
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| 48 | #define BRA_BUF_SIZE (1 << 14)
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| 49 |
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| 50 | typedef struct
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| 51 | {
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| 52 | size_t bufPos;
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| 53 | size_t bufConv;
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| 54 | size_t bufTotal;
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| 55 |
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| 56 | UInt32 methodId;
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| 57 | int encodeMode;
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| 58 | UInt32 delta;
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| 59 | UInt32 ip;
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| 60 | UInt32 x86State;
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| 61 | Byte deltaState[DELTA_STATE_SIZE];
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| 62 |
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| 63 | Byte buf[BRA_BUF_SIZE];
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| 64 | } CBraState;
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| 65 |
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| 66 | void BraState_Free(void *pp, ISzAlloc *alloc)
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| 67 | {
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| 68 | alloc->Free(alloc, pp);
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| 69 | }
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| 70 |
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| 71 | SRes BraState_SetProps(void *pp, const Byte *props, size_t propSize, ISzAlloc *alloc)
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| 72 | {
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| 73 | CBraState *p = ((CBraState *)pp);
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| 74 | alloc = alloc;
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| 75 | p->encodeMode = 0;
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| 76 | p->ip = 0;
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| 77 | if (p->methodId == XZ_ID_Delta)
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| 78 | {
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| 79 | if (propSize != 1)
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| 80 | return SZ_ERROR_UNSUPPORTED;
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| 81 | p->delta = (unsigned)props[0] + 1;
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| 82 | }
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| 83 | else
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| 84 | {
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| 85 | if (propSize == 4)
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| 86 | {
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| 87 | UInt32 v = GetUi32(props);
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| 88 | switch(p->methodId)
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| 89 | {
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| 90 | case XZ_ID_PPC:
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| 91 | case XZ_ID_ARM:
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| 92 | case XZ_ID_SPARC:
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| 93 | if ((v & 3) != 0)
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| 94 | return SZ_ERROR_UNSUPPORTED;
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| 95 | break;
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| 96 | case XZ_ID_ARMT:
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| 97 | if ((v & 1) != 0)
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| 98 | return SZ_ERROR_UNSUPPORTED;
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| 99 | break;
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| 100 | case XZ_ID_IA64:
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| 101 | if ((v & 0xF) != 0)
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| 102 | return SZ_ERROR_UNSUPPORTED;
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| 103 | break;
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| 104 | }
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| 105 | p->ip = v;
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| 106 | }
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| 107 | else if (propSize != 0)
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| 108 | return SZ_ERROR_UNSUPPORTED;
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| 109 | }
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| 110 | return SZ_OK;
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| 111 | }
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| 112 |
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| 113 | void BraState_Init(void *pp)
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| 114 | {
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| 115 | CBraState *p = ((CBraState *)pp);
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| 116 | p->bufPos = p->bufConv = p->bufTotal = 0;
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| 117 | x86_Convert_Init(p->x86State);
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| 118 | if (p->methodId == XZ_ID_Delta)
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| 119 | Delta_Init(p->deltaState);
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| 120 | }
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| 121 |
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| 122 | #define CASE_BRA_CONV(isa) case XZ_ID_ ## isa: p->bufConv = isa ## _Convert(p->buf, p->bufTotal, p->ip, p->encodeMode); break;
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| 123 |
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| 124 | static SRes BraState_Code(void *pp, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
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| 125 | int srcWasFinished, ECoderFinishMode finishMode, int *wasFinished)
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| 126 | {
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| 127 | CBraState *p = ((CBraState *)pp);
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| 128 | SizeT destLenOrig = *destLen;
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| 129 | SizeT srcLenOrig = *srcLen;
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| 130 | *destLen = 0;
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| 131 | *srcLen = 0;
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| 132 | finishMode = finishMode;
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| 133 | *wasFinished = 0;
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| 134 | while (destLenOrig > 0)
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| 135 | {
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| 136 | if (p->bufPos != p->bufConv)
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| 137 | {
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| 138 | size_t curSize = p->bufConv - p->bufPos;
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| 139 | if (curSize > destLenOrig)
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| 140 | curSize = destLenOrig;
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| 141 | memcpy(dest, p->buf + p->bufPos, curSize);
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| 142 | p->bufPos += curSize;
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| 143 | *destLen += curSize;
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| 144 | dest += curSize;
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| 145 | destLenOrig -= curSize;
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| 146 | continue;
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| 147 | }
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| 148 | p->bufTotal -= p->bufPos;
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| 149 | memmove(p->buf, p->buf + p->bufPos, p->bufTotal);
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| 150 | p->bufPos = 0;
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| 151 | p->bufConv = 0;
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| 152 | {
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| 153 | size_t curSize = BRA_BUF_SIZE - p->bufTotal;
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| 154 | if (curSize > srcLenOrig)
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| 155 | curSize = srcLenOrig;
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| 156 | memcpy(p->buf + p->bufTotal, src, curSize);
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| 157 | *srcLen += curSize;
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| 158 | src += curSize;
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| 159 | srcLenOrig -= curSize;
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| 160 | p->bufTotal += curSize;
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| 161 | }
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| 162 | if (p->bufTotal == 0)
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| 163 | break;
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| 164 | switch(p->methodId)
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| 165 | {
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| 166 | case XZ_ID_Delta:
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| 167 | if (p->encodeMode)
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| 168 | Delta_Encode(p->deltaState, p->delta, p->buf, p->bufTotal);
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| 169 | else
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| 170 | Delta_Decode(p->deltaState, p->delta, p->buf, p->bufTotal);
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| 171 | p->bufConv = p->bufTotal;
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| 172 | break;
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| 173 | case XZ_ID_X86:
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| 174 | p->bufConv = x86_Convert(p->buf, p->bufTotal, p->ip, &p->x86State, p->encodeMode);
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| 175 | break;
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| 176 | CASE_BRA_CONV(PPC)
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| 177 | CASE_BRA_CONV(IA64)
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| 178 | CASE_BRA_CONV(ARM)
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| 179 | CASE_BRA_CONV(ARMT)
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| 180 | CASE_BRA_CONV(SPARC)
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| 181 | default:
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| 182 | return SZ_ERROR_UNSUPPORTED;
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| 183 | }
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| 184 | p->ip += (UInt32)p->bufConv;
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| 185 |
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| 186 | if (p->bufConv == 0)
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| 187 | {
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| 188 | if (!srcWasFinished)
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| 189 | break;
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| 190 | p->bufConv = p->bufTotal;
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| 191 | }
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| 192 | }
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| 193 | if (p->bufTotal == p->bufPos && srcLenOrig == 0 && srcWasFinished)
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| 194 | *wasFinished = 1;
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| 195 | return SZ_OK;
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| 196 | }
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| 197 |
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| 198 | SRes BraState_SetFromMethod(IStateCoder *p, UInt64 id, ISzAlloc *alloc)
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| 199 | {
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| 200 | CBraState *decoder;
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| 201 | if (id != XZ_ID_Delta &&
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| 202 | id != XZ_ID_X86 &&
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| 203 | id != XZ_ID_PPC &&
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| 204 | id != XZ_ID_IA64 &&
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| 205 | id != XZ_ID_ARM &&
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| 206 | id != XZ_ID_ARMT &&
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| 207 | id != XZ_ID_SPARC)
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| 208 | return SZ_ERROR_UNSUPPORTED;
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| 209 | p->p = 0;
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| 210 | decoder = alloc->Alloc(alloc, sizeof(CBraState));
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| 211 | if (decoder == 0)
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| 212 | return SZ_ERROR_MEM;
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| 213 | decoder->methodId = (UInt32)id;
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| 214 | p->p = decoder;
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| 215 | p->Free = BraState_Free;
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| 216 | p->SetProps = BraState_SetProps;
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| 217 | p->Init = BraState_Init;
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| 218 | p->Code = BraState_Code;
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| 219 | return SZ_OK;
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| 220 | }
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| 221 |
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| 222 | /* ---------- SbState ---------- */
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| 223 |
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| 224 | #ifdef USE_SUBBLOCK
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| 225 |
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| 226 | static void SbState_Free(void *pp, ISzAlloc *alloc)
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| 227 | {
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| 228 | CSubblockDec *p = (CSubblockDec *)pp;
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| 229 | SubblockDec_Free(p, alloc);
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| 230 | alloc->Free(alloc, pp);
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| 231 | }
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| 232 |
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| 233 | static SRes SbState_SetProps(void *pp, const Byte *props, size_t propSize, ISzAlloc *alloc)
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| 234 | {
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| 235 | pp = pp;
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| 236 | props = props;
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| 237 | alloc = alloc;
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| 238 | return (propSize == 0) ? SZ_OK : SZ_ERROR_UNSUPPORTED;
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| 239 | }
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| 240 |
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| 241 | static void SbState_Init(void *pp)
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| 242 | {
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| 243 | SubblockDec_Init((CSubblockDec *)pp);
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| 244 | }
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| 245 |
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| 246 | static SRes SbState_Code(void *pp, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
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| 247 | int srcWasFinished, ECoderFinishMode finishMode, int *wasFinished)
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| 248 | {
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| 249 | ECoderStatus status;
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| 250 | SRes res = SubblockDec_Decode((CSubblockDec *)pp, dest, destLen, src, srcLen, finishMode, &status);
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| 251 | srcWasFinished = srcWasFinished;
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| 252 | *wasFinished = (status == LZMA_STATUS_FINISHED_WITH_MARK);
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| 253 | return res;
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| 254 | }
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| 255 |
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| 256 | SRes SbState_SetFromMethod(IStateCoder *p, ISzAlloc *alloc)
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| 257 | {
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| 258 | CSubblockDec *decoder;
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| 259 | p->p = 0;
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| 260 | decoder = alloc->Alloc(alloc, sizeof(CSubblockDec));
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| 261 | if (decoder == 0)
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| 262 | return SZ_ERROR_MEM;
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| 263 | p->p = decoder;
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| 264 | p->Free = SbState_Free;
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| 265 | p->SetProps = SbState_SetProps;
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| 266 | p->Init = SbState_Init;
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| 267 | p->Code = SbState_Code;
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| 268 | SubblockDec_Construct(decoder);
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| 269 | return SZ_OK;
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| 270 | }
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| 271 | #endif
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| 272 |
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| 273 | /* ---------- Lzma2State ---------- */
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| 274 |
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| 275 | static void Lzma2State_Free(void *pp, ISzAlloc *alloc)
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| 276 | {
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| 277 | Lzma2Dec_Free((CLzma2Dec *)pp, alloc);
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| 278 | alloc->Free(alloc, pp);
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| 279 | }
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| 280 |
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| 281 | static SRes Lzma2State_SetProps(void *pp, const Byte *props, size_t propSize, ISzAlloc *alloc)
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| 282 | {
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| 283 | if (propSize != 1)
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| 284 | return SZ_ERROR_UNSUPPORTED;
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| 285 | return Lzma2Dec_Allocate((CLzma2Dec *)pp, props[0], alloc);
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| 286 | }
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| 287 |
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| 288 | static void Lzma2State_Init(void *pp)
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| 289 | {
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| 290 | Lzma2Dec_Init((CLzma2Dec *)pp);
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| 291 | }
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| 292 |
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| 293 | static SRes Lzma2State_Code(void *pp, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
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| 294 | int srcWasFinished, ECoderFinishMode finishMode, int *wasFinished)
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| 295 | {
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| 296 | ELzmaStatus status;
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| 297 | /* ELzmaFinishMode fm = (finishMode == LZMA_FINISH_ANY) ? LZMA_FINISH_ANY : LZMA_FINISH_END; */
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| 298 | SRes res = Lzma2Dec_DecodeToBuf((CLzma2Dec *)pp, dest, destLen, src, srcLen, finishMode, &status);
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| 299 | srcWasFinished = srcWasFinished;
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| 300 | *wasFinished = (status == LZMA_STATUS_FINISHED_WITH_MARK);
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| 301 | return res;
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| 302 | }
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| 303 |
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| 304 | static SRes Lzma2State_SetFromMethod(IStateCoder *p, ISzAlloc *alloc)
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| 305 | {
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| 306 | CLzma2Dec *decoder = alloc->Alloc(alloc, sizeof(CLzma2Dec));
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| 307 | p->p = decoder;
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| 308 | if (decoder == 0)
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| 309 | return SZ_ERROR_MEM;
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| 310 | p->Free = Lzma2State_Free;
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| 311 | p->SetProps = Lzma2State_SetProps;
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| 312 | p->Init = Lzma2State_Init;
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| 313 | p->Code = Lzma2State_Code;
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| 314 | Lzma2Dec_Construct(decoder);
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| 315 | return SZ_OK;
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| 316 | }
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| 317 |
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| 318 |
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| 319 | void MixCoder_Construct(CMixCoder *p, ISzAlloc *alloc)
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| 320 | {
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| 321 | int i;
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| 322 | p->alloc = alloc;
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| 323 | p->buf = 0;
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| 324 | p->numCoders = 0;
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| 325 | for (i = 0; i < MIXCODER_NUM_FILTERS_MAX; i++)
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| 326 | p->coders[i].p = NULL;
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| 327 | }
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| 328 |
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| 329 | void MixCoder_Free(CMixCoder *p)
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| 330 | {
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| 331 | int i;
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| 332 | for (i = 0; i < p->numCoders; i++)
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| 333 | {
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| 334 | IStateCoder *sc = &p->coders[i];
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| 335 | if (p->alloc && sc->p)
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| 336 | sc->Free(sc->p, p->alloc);
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| 337 | }
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| 338 | p->numCoders = 0;
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| 339 | if (p->buf)
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| 340 | p->alloc->Free(p->alloc, p->buf);
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| 341 | }
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| 342 |
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| 343 | void MixCoder_Init(CMixCoder *p)
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| 344 | {
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| 345 | int i;
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| 346 | for (i = 0; i < p->numCoders - 1; i++)
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| 347 | {
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| 348 | p->size[i] = 0;
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| 349 | p->pos[i] = 0;
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| 350 | p->finished[i] = 0;
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| 351 | }
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| 352 | for (i = 0; i < p->numCoders; i++)
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| 353 | {
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| 354 | IStateCoder *coder = &p->coders[i];
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| 355 | coder->Init(coder->p);
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| 356 | }
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| 357 | }
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| 358 |
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| 359 | SRes MixCoder_SetFromMethod(CMixCoder *p, int coderIndex, UInt64 methodId)
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| 360 | {
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| 361 | IStateCoder *sc = &p->coders[coderIndex];
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| 362 | p->ids[coderIndex] = methodId;
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| 363 | switch(methodId)
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| 364 | {
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| 365 | case XZ_ID_LZMA2: return Lzma2State_SetFromMethod(sc, p->alloc);
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| 366 | #ifdef USE_SUBBLOCK
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| 367 | case XZ_ID_Subblock: return SbState_SetFromMethod(sc, p->alloc);
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| 368 | #endif
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| 369 | }
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| 370 | if (coderIndex == 0)
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| 371 | return SZ_ERROR_UNSUPPORTED;
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| 372 | return BraState_SetFromMethod(sc, methodId, p->alloc);
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| 373 | }
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| 374 |
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| 375 | SRes MixCoder_Code(CMixCoder *p, Byte *dest, SizeT *destLen,
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| 376 | const Byte *src, SizeT *srcLen, int srcWasFinished,
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| 377 | ECoderFinishMode finishMode, ECoderStatus *status)
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| 378 | {
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| 379 | SizeT destLenOrig = *destLen;
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| 380 | SizeT srcLenOrig = *srcLen;
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| 381 | Bool allFinished = True;
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| 382 | *destLen = 0;
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| 383 | *srcLen = 0;
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| 384 | *status = CODER_STATUS_NOT_FINISHED;
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| 385 |
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| 386 | if (p->buf == 0)
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| 387 | {
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| 388 | p->buf = p->alloc->Alloc(p->alloc, CODER_BUF_SIZE * (MIXCODER_NUM_FILTERS_MAX - 1));
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| 389 | if (p->buf == 0)
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| 390 | return SZ_ERROR_MEM;
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| 391 | }
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| 392 |
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| 393 | if (p->numCoders != 1)
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| 394 | finishMode = CODER_FINISH_ANY;
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| 395 |
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| 396 | for (;;)
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| 397 | {
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| 398 | Bool processed = False;
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| 399 | int i;
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| 400 | /*
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| 401 | if (p->numCoders == 1 && *destLen == destLenOrig && finishMode == LZMA_FINISH_ANY)
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| 402 | break;
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| 403 | */
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| 404 |
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| 405 | for (i = 0; i < p->numCoders; i++)
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| 406 | {
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| 407 | SRes res;
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| 408 | IStateCoder *coder = &p->coders[i];
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| 409 | Byte *destCur;
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| 410 | SizeT destLenCur, srcLenCur;
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| 411 | const Byte *srcCur;
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| 412 | int srcFinishedCur;
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| 413 | int encodingWasFinished;
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| 414 |
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| 415 | if (i == 0)
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| 416 | {
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| 417 | srcCur = src;
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| 418 | srcLenCur = srcLenOrig - *srcLen;
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| 419 | srcFinishedCur = srcWasFinished;
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| 420 | }
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| 421 | else
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| 422 | {
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| 423 | srcCur = p->buf + (CODER_BUF_SIZE * (i - 1)) + p->pos[i - 1];
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| 424 | srcLenCur = p->size[i - 1] - p->pos[i - 1];
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| 425 | srcFinishedCur = p->finished[i - 1];
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| 426 | }
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| 427 |
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| 428 | if (i == p->numCoders - 1)
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| 429 | {
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| 430 | destCur = dest;
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| 431 | destLenCur = destLenOrig - *destLen;
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| 432 | }
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| 433 | else
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| 434 | {
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| 435 | if (p->pos[i] != p->size[i])
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| 436 | continue;
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| 437 | destCur = p->buf + (CODER_BUF_SIZE * i);
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| 438 | destLenCur = CODER_BUF_SIZE;
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| 439 | }
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| 440 |
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| 441 | res = coder->Code(coder->p, destCur, &destLenCur, srcCur, &srcLenCur, srcFinishedCur, finishMode, &encodingWasFinished);
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| 442 |
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| 443 | if (!encodingWasFinished)
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| 444 | allFinished = False;
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| 445 |
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| 446 | if (i == 0)
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| 447 | {
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| 448 | *srcLen += srcLenCur;
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| 449 | src += srcLenCur;
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| 450 | }
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| 451 | else
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| 452 | {
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| 453 | p->pos[i - 1] += srcLenCur;
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| 454 | }
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| 455 |
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| 456 | if (i == p->numCoders - 1)
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| 457 | {
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| 458 | *destLen += destLenCur;
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| 459 | dest += destLenCur;
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| 460 | }
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| 461 | else
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| 462 | {
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| 463 | p->size[i] = destLenCur;
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| 464 | p->pos[i] = 0;
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| 465 | p->finished[i] = encodingWasFinished;
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| 466 | }
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| 467 |
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| 468 | if (res != SZ_OK)
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| 469 | return res;
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| 470 |
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| 471 | if (destLenCur != 0 || srcLenCur != 0)
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| 472 | processed = True;
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| 473 | }
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| 474 | if (!processed)
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| 475 | break;
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| 476 | }
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| 477 | if (allFinished)
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| 478 | *status = CODER_STATUS_FINISHED_WITH_MARK;
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| 479 | return SZ_OK;
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| 480 | }
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| 481 |
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| 482 | SRes Xz_ParseHeader(CXzStreamFlags *p, const Byte *buf)
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| 483 | {
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| 484 | *p = (CXzStreamFlags)GetBe16(buf + XZ_SIG_SIZE);
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| 485 | if (CrcCalc(buf + XZ_SIG_SIZE, XZ_STREAM_FLAGS_SIZE) !=
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| 486 | GetUi32(buf + XZ_SIG_SIZE + XZ_STREAM_FLAGS_SIZE))
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| 487 | return SZ_ERROR_NO_ARCHIVE;
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| 488 | return XzFlags_IsSupported(*p) ? SZ_OK : SZ_ERROR_UNSUPPORTED;
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| 489 | }
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| 490 |
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| 491 | static Bool Xz_CheckFooter(CXzStreamFlags flags, UInt64 indexSize, const Byte *buf)
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| 492 | {
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| 493 | return
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| 494 | indexSize == (((UInt64)GetUi32(buf + 4) + 1) << 2) &&
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| 495 | (GetUi32(buf) == CrcCalc(buf + 4, 6) &&
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| 496 | flags == GetBe16(buf + 8) &&
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| 497 | memcmp(buf + 10, XZ_FOOTER_SIG, XZ_FOOTER_SIG_SIZE) == 0);
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| 498 | }
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| 499 |
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| 500 | #define READ_VARINT_AND_CHECK(buf, pos, size, res) \
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| 501 | { unsigned s = Xz_ReadVarInt(buf + pos, size - pos, res); \
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| 502 | if (s == 0) return SZ_ERROR_ARCHIVE; pos += s; }
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| 503 |
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| 504 |
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| 505 | SRes XzBlock_Parse(CXzBlock *p, const Byte *header)
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| 506 | {
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| 507 | unsigned pos;
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| 508 | int numFilters, i;
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| 509 | UInt32 headerSize = (UInt32)header[0] << 2;
|
| 510 |
|
| 511 | if (CrcCalc(header, headerSize) != GetUi32(header + headerSize))
|
| 512 | return SZ_ERROR_ARCHIVE;
|
| 513 |
|
| 514 | pos = 1;
|
| 515 | if (pos == headerSize)
|
| 516 | return SZ_ERROR_ARCHIVE;
|
| 517 | p->flags = header[pos++];
|
| 518 |
|
| 519 | if (XzBlock_HasPackSize(p))
|
| 520 | {
|
| 521 | READ_VARINT_AND_CHECK(header, pos, headerSize, &p->packSize);
|
| 522 | if (p->packSize == 0 || p->packSize + headerSize >= (UInt64)1 << 63)
|
| 523 | return SZ_ERROR_ARCHIVE;
|
| 524 | }
|
| 525 |
|
| 526 | if (XzBlock_HasUnpackSize(p))
|
| 527 | READ_VARINT_AND_CHECK(header, pos, headerSize, &p->unpackSize);
|
| 528 |
|
| 529 | numFilters = XzBlock_GetNumFilters(p);
|
| 530 | for (i = 0; i < numFilters; i++)
|
| 531 | {
|
| 532 | CXzFilter *filter = p->filters + i;
|
| 533 | UInt64 size;
|
| 534 | READ_VARINT_AND_CHECK(header, pos, headerSize, &filter->id);
|
| 535 | READ_VARINT_AND_CHECK(header, pos, headerSize, &size);
|
| 536 | if (size > headerSize - pos || size > XZ_FILTER_PROPS_SIZE_MAX)
|
| 537 | return SZ_ERROR_ARCHIVE;
|
| 538 | filter->propsSize = (UInt32)size;
|
| 539 | memcpy(filter->props, header + pos, (size_t)size);
|
| 540 | pos += (unsigned)size;
|
| 541 |
|
| 542 | #ifdef XZ_DUMP
|
| 543 | printf("\nf[%d] = %2X: ", i, filter->id);
|
| 544 | {
|
| 545 | int i;
|
| 546 | for (i = 0; i < size; i++)
|
| 547 | printf(" %2X", filter->props[i]);
|
| 548 | }
|
| 549 | #endif
|
| 550 | }
|
| 551 |
|
| 552 | while (pos < headerSize)
|
| 553 | if (header[pos++] != 0)
|
| 554 | return SZ_ERROR_ARCHIVE;
|
| 555 | return SZ_OK;
|
| 556 | }
|
| 557 |
|
| 558 | SRes XzDec_Init(CMixCoder *p, const CXzBlock *block)
|
| 559 | {
|
| 560 | int i;
|
| 561 | Bool needReInit = True;
|
| 562 | int numFilters = XzBlock_GetNumFilters(block);
|
| 563 | if (numFilters == p->numCoders)
|
| 564 | {
|
| 565 | for (i = 0; i < numFilters; i++)
|
| 566 | if (p->ids[i] != block->filters[numFilters - 1 - i].id)
|
| 567 | break;
|
| 568 | needReInit = (i != numFilters);
|
| 569 | }
|
| 570 | if (needReInit)
|
| 571 | {
|
| 572 | MixCoder_Free(p);
|
| 573 | p->numCoders = numFilters;
|
| 574 | for (i = 0; i < numFilters; i++)
|
| 575 | {
|
| 576 | const CXzFilter *f = &block->filters[numFilters - 1 - i];
|
| 577 | RINOK(MixCoder_SetFromMethod(p, i, f->id));
|
| 578 | }
|
| 579 | }
|
| 580 | for (i = 0; i < numFilters; i++)
|
| 581 | {
|
| 582 | const CXzFilter *f = &block->filters[numFilters - 1 - i];
|
| 583 | IStateCoder *sc = &p->coders[i];
|
| 584 | RINOK(sc->SetProps(sc->p, f->props, f->propsSize, p->alloc));
|
| 585 | }
|
| 586 | MixCoder_Init(p);
|
| 587 | return SZ_OK;
|
| 588 | }
|
| 589 |
|
| 590 | SRes XzUnpacker_Create(CXzUnpacker *p, ISzAlloc *alloc)
|
| 591 | {
|
| 592 | MixCoder_Construct(&p->decoder, alloc);
|
| 593 | p->state = XZ_STATE_STREAM_HEADER;
|
| 594 | p->pos = 0;
|
| 595 | p->numStreams = 0;
|
| 596 | return SZ_OK;
|
| 597 | }
|
| 598 |
|
| 599 | void XzUnpacker_Free(CXzUnpacker *p)
|
| 600 | {
|
| 601 | MixCoder_Free(&p->decoder);
|
| 602 | }
|
| 603 |
|
| 604 | SRes XzUnpacker_Code(CXzUnpacker *p, Byte *dest, SizeT *destLen,
|
| 605 | const Byte *src, SizeT *srcLen, int finishMode, ECoderStatus *status)
|
| 606 | {
|
| 607 | SizeT destLenOrig = *destLen;
|
| 608 | SizeT srcLenOrig = *srcLen;
|
| 609 | *destLen = 0;
|
| 610 | *srcLen = 0;
|
| 611 | *status = CODER_STATUS_NOT_SPECIFIED;
|
| 612 | for (;;)
|
| 613 | {
|
| 614 | SizeT srcRem = srcLenOrig - *srcLen;
|
| 615 |
|
| 616 | if (p->state == XZ_STATE_BLOCK)
|
| 617 | {
|
| 618 | SizeT destLen2 = destLenOrig - *destLen;
|
| 619 | SizeT srcLen2 = srcLenOrig - *srcLen;
|
| 620 | SRes res;
|
| 621 | if (srcLen2 == 0 && destLen2 == 0)
|
| 622 | {
|
| 623 | *status = CODER_STATUS_NOT_FINISHED;
|
| 624 | return SZ_OK;
|
| 625 | }
|
| 626 |
|
| 627 | res = MixCoder_Code(&p->decoder, dest, &destLen2, src, &srcLen2, False, finishMode, status);
|
| 628 | XzCheck_Update(&p->check, dest, destLen2);
|
| 629 |
|
| 630 | (*srcLen) += srcLen2;
|
| 631 | src += srcLen2;
|
| 632 | p->packSize += srcLen2;
|
| 633 |
|
| 634 | (*destLen) += destLen2;
|
| 635 | dest += destLen2;
|
| 636 | p->unpackSize += destLen2;
|
| 637 |
|
| 638 | RINOK(res);
|
| 639 |
|
| 640 | if (*status == CODER_STATUS_FINISHED_WITH_MARK)
|
| 641 | {
|
| 642 | Byte temp[32];
|
| 643 | unsigned num = Xz_WriteVarInt(temp, p->packSize + p->blockHeaderSize + XzFlags_GetCheckSize(p->streamFlags));
|
| 644 | num += Xz_WriteVarInt(temp + num, p->unpackSize);
|
| 645 | Sha256_Update(&p->sha, temp, num);
|
| 646 | p->indexSize += num;
|
| 647 | p->numBlocks++;
|
| 648 |
|
| 649 | p->state = XZ_STATE_BLOCK_FOOTER;
|
| 650 | p->pos = 0;
|
| 651 | p->alignPos = 0;
|
| 652 | }
|
| 653 | else if (srcLen2 == 0 && destLen2 == 0)
|
| 654 | return SZ_OK;
|
| 655 |
|
| 656 | continue;
|
| 657 | }
|
| 658 |
|
| 659 | if (srcRem == 0)
|
| 660 | {
|
| 661 | *status = CODER_STATUS_NEEDS_MORE_INPUT;
|
| 662 | return SZ_OK;
|
| 663 | }
|
| 664 |
|
| 665 | switch(p->state)
|
| 666 | {
|
| 667 | case XZ_STATE_STREAM_HEADER:
|
| 668 | {
|
| 669 | if (p->pos < XZ_STREAM_HEADER_SIZE)
|
| 670 | {
|
| 671 | if (p->pos < XZ_SIG_SIZE && *src != XZ_SIG[p->pos])
|
| 672 | return SZ_ERROR_NO_ARCHIVE;
|
| 673 | p->buf[p->pos++] = *src++;
|
| 674 | (*srcLen)++;
|
| 675 | }
|
| 676 | else
|
| 677 | {
|
| 678 | RINOK(Xz_ParseHeader(&p->streamFlags, p->buf));
|
| 679 | p->state = XZ_STATE_BLOCK_HEADER;
|
| 680 | Sha256_Init(&p->sha);
|
| 681 | p->indexSize = 0;
|
| 682 | p->numBlocks = 0;
|
| 683 | p->pos = 0;
|
| 684 | }
|
| 685 | break;
|
| 686 | }
|
| 687 |
|
| 688 | case XZ_STATE_BLOCK_HEADER:
|
| 689 | {
|
| 690 | if (p->pos == 0)
|
| 691 | {
|
| 692 | p->buf[p->pos++] = *src++;
|
| 693 | (*srcLen)++;
|
| 694 | if (p->buf[0] == 0)
|
| 695 | {
|
| 696 | p->indexPreSize = 1 + Xz_WriteVarInt(p->buf + 1, p->numBlocks);
|
| 697 | p->indexPos = p->indexPreSize;
|
| 698 | p->indexSize += p->indexPreSize;
|
| 699 | Sha256_Final(&p->sha, p->shaDigest);
|
| 700 | Sha256_Init(&p->sha);
|
| 701 | p->crc = CrcUpdate(CRC_INIT_VAL, p->buf, p->indexPreSize);
|
| 702 | p->state = XZ_STATE_STREAM_INDEX;
|
| 703 | }
|
| 704 | p->blockHeaderSize = ((UInt32)p->buf[0] << 2) + 4;
|
| 705 | }
|
| 706 | else if (p->pos != p->blockHeaderSize)
|
| 707 | {
|
| 708 | UInt32 cur = p->blockHeaderSize - p->pos;
|
| 709 | if (cur > srcRem)
|
| 710 | cur = (UInt32)srcRem;
|
| 711 | memcpy(p->buf + p->pos, src, cur);
|
| 712 | p->pos += cur;
|
| 713 | (*srcLen) += cur;
|
| 714 | src += cur;
|
| 715 | }
|
| 716 | else
|
| 717 | {
|
| 718 | RINOK(XzBlock_Parse(&p->block, p->buf));
|
| 719 | p->state = XZ_STATE_BLOCK;
|
| 720 | p->packSize = 0;
|
| 721 | p->unpackSize = 0;
|
| 722 | XzCheck_Init(&p->check, XzFlags_GetCheckType(p->streamFlags));
|
| 723 | RINOK(XzDec_Init(&p->decoder, &p->block));
|
| 724 | }
|
| 725 | break;
|
| 726 | }
|
| 727 |
|
| 728 | case XZ_STATE_BLOCK_FOOTER:
|
| 729 | {
|
| 730 | if (((p->packSize + p->alignPos) & 3) != 0)
|
| 731 | {
|
| 732 | (*srcLen)++;
|
| 733 | p->alignPos++;
|
| 734 | if (*src++ != 0)
|
| 735 | return SZ_ERROR_CRC;
|
| 736 | }
|
| 737 | else
|
| 738 | {
|
| 739 | UInt32 checkSize = XzFlags_GetCheckSize(p->streamFlags);
|
| 740 | UInt32 cur = checkSize - p->pos;
|
| 741 | if (cur != 0)
|
| 742 | {
|
| 743 | if (cur > srcRem)
|
| 744 | cur = (UInt32)srcRem;
|
| 745 | memcpy(p->buf + p->pos, src, cur);
|
| 746 | p->pos += cur;
|
| 747 | (*srcLen) += cur;
|
| 748 | src += cur;
|
| 749 | }
|
| 750 | else
|
| 751 | {
|
| 752 | Byte digest[XZ_CHECK_SIZE_MAX];
|
| 753 | p->state = XZ_STATE_BLOCK_HEADER;
|
| 754 | p->pos = 0;
|
| 755 | if (XzCheck_Final(&p->check, digest) && memcmp(digest, p->buf, checkSize) != 0)
|
| 756 | return SZ_ERROR_CRC;
|
| 757 | }
|
| 758 | }
|
| 759 | break;
|
| 760 | }
|
| 761 |
|
| 762 | case XZ_STATE_STREAM_INDEX:
|
| 763 | {
|
| 764 | if (p->pos < p->indexPreSize)
|
| 765 | {
|
| 766 | (*srcLen)++;
|
| 767 | if (*src++ != p->buf[p->pos++])
|
| 768 | return SZ_ERROR_CRC;
|
| 769 | }
|
| 770 | else
|
| 771 | {
|
| 772 | if (p->indexPos < p->indexSize)
|
| 773 | {
|
| 774 | UInt64 cur = p->indexSize - p->indexPos;
|
| 775 | if (srcRem > cur)
|
| 776 | srcRem = (SizeT)cur;
|
| 777 | p->crc = CrcUpdate(p->crc, src, srcRem);
|
| 778 | Sha256_Update(&p->sha, src, srcRem);
|
| 779 | (*srcLen) += srcRem;
|
| 780 | src += srcRem;
|
| 781 | p->indexPos += srcRem;
|
| 782 | }
|
| 783 | else if ((p->indexPos & 3) != 0)
|
| 784 | {
|
| 785 | Byte b = *src++;
|
| 786 | p->crc = CRC_UPDATE_BYTE(p->crc, b);
|
| 787 | (*srcLen)++;
|
| 788 | p->indexPos++;
|
| 789 | p->indexSize++;
|
| 790 | if (b != 0)
|
| 791 | return SZ_ERROR_CRC;
|
| 792 | }
|
| 793 | else
|
| 794 | {
|
| 795 | Byte digest[SHA256_DIGEST_SIZE];
|
| 796 | p->state = XZ_STATE_STREAM_INDEX_CRC;
|
| 797 | p->indexSize += 4;
|
| 798 | p->pos = 0;
|
| 799 | Sha256_Final(&p->sha, digest);
|
| 800 | if (memcmp(digest, p->shaDigest, SHA256_DIGEST_SIZE) != 0)
|
| 801 | return SZ_ERROR_CRC;
|
| 802 | }
|
| 803 | }
|
| 804 | break;
|
| 805 | }
|
| 806 |
|
| 807 | case XZ_STATE_STREAM_INDEX_CRC:
|
| 808 | {
|
| 809 | if (p->pos < 4)
|
| 810 | {
|
| 811 | (*srcLen)++;
|
| 812 | p->buf[p->pos++] = *src++;
|
| 813 | }
|
| 814 | else
|
| 815 | {
|
| 816 | p->state = XZ_STATE_STREAM_FOOTER;
|
| 817 | p->pos = 0;
|
| 818 | if (CRC_GET_DIGEST(p->crc) != GetUi32(p->buf))
|
| 819 | return SZ_ERROR_CRC;
|
| 820 | }
|
| 821 | break;
|
| 822 | }
|
| 823 |
|
| 824 | case XZ_STATE_STREAM_FOOTER:
|
| 825 | {
|
| 826 | UInt32 cur = XZ_STREAM_FOOTER_SIZE - p->pos;
|
| 827 | if (cur > srcRem)
|
| 828 | cur = (UInt32)srcRem;
|
| 829 | memcpy(p->buf + p->pos, src, cur);
|
| 830 | p->pos += cur;
|
| 831 | (*srcLen) += cur;
|
| 832 | src += cur;
|
| 833 | if (p->pos == XZ_STREAM_FOOTER_SIZE)
|
| 834 | {
|
| 835 | p->state = XZ_STATE_STREAM_PADDING;
|
| 836 | p->numStreams++;
|
| 837 | p->padSize = 0;
|
| 838 | if (!Xz_CheckFooter(p->streamFlags, p->indexSize, p->buf))
|
| 839 | return SZ_ERROR_CRC;
|
| 840 | }
|
| 841 | break;
|
| 842 | }
|
| 843 |
|
| 844 | case XZ_STATE_STREAM_PADDING:
|
| 845 | {
|
| 846 | if (*src != 0)
|
| 847 | {
|
| 848 | if (((UInt32)p->padSize & 3) != 0)
|
| 849 | return SZ_ERROR_NO_ARCHIVE;
|
| 850 | p->pos = 0;
|
| 851 | p->state = XZ_STATE_STREAM_HEADER;
|
| 852 | }
|
| 853 | else
|
| 854 | {
|
| 855 | (*srcLen)++;
|
| 856 | src++;
|
| 857 | p->padSize++;
|
| 858 | }
|
| 859 | break;
|
| 860 | }
|
| 861 |
|
| 862 | case XZ_STATE_BLOCK: break; /* to disable GCC warning */
|
| 863 | }
|
| 864 | }
|
| 865 | /*
|
| 866 | if (p->state == XZ_STATE_FINISHED)
|
| 867 | *status = CODER_STATUS_FINISHED_WITH_MARK;
|
| 868 | return SZ_OK;
|
| 869 | */
|
| 870 | }
|
| 871 |
|
| 872 | Bool XzUnpacker_IsStreamWasFinished(CXzUnpacker *p)
|
| 873 | {
|
| 874 | return (p->state == XZ_STATE_STREAM_PADDING) && (((UInt32)p->padSize & 3) == 0);
|
| 875 | }
|