2 2015-11-08 : Igor Pavlov : Public domain */
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12 SRes Xz_ReadHeader(CXzStreamFlags *p, ISeqInStream *inStream)
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14 Byte sig[XZ_STREAM_HEADER_SIZE];
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15 RINOK(SeqInStream_Read2(inStream, sig, XZ_STREAM_HEADER_SIZE, SZ_ERROR_NO_ARCHIVE));
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16 if (memcmp(sig, XZ_SIG, XZ_SIG_SIZE) != 0)
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17 return SZ_ERROR_NO_ARCHIVE;
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18 return Xz_ParseHeader(p, sig);
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21 #define READ_VARINT_AND_CHECK(buf, pos, size, res) \
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22 { unsigned s = Xz_ReadVarInt(buf + pos, size - pos, res); \
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23 if (s == 0) return SZ_ERROR_ARCHIVE; pos += s; }
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25 SRes XzBlock_ReadHeader(CXzBlock *p, ISeqInStream *inStream, Bool *isIndex, UInt32 *headerSizeRes)
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27 Byte header[XZ_BLOCK_HEADER_SIZE_MAX];
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28 unsigned headerSize;
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30 RINOK(SeqInStream_ReadByte(inStream, &header[0]));
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31 headerSize = ((unsigned)header[0] << 2) + 4;
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32 if (headerSize == 0)
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40 *headerSizeRes = headerSize;
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41 RINOK(SeqInStream_Read(inStream, header + 1, headerSize - 1));
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42 return XzBlock_Parse(p, header);
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45 #define ADD_SIZE_CHECH(size, val) \
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46 { UInt64 newSize = size + (val); if (newSize < size) return XZ_SIZE_OVERFLOW; size = newSize; }
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48 UInt64 Xz_GetUnpackSize(const CXzStream *p)
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52 for (i = 0; i < p->numBlocks; i++)
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53 ADD_SIZE_CHECH(size, p->blocks[i].unpackSize);
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57 UInt64 Xz_GetPackSize(const CXzStream *p)
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61 for (i = 0; i < p->numBlocks; i++)
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62 ADD_SIZE_CHECH(size, (p->blocks[i].totalSize + 3) & ~(UInt64)3);
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67 SRes XzBlock_ReadFooter(CXzBlock *p, CXzStreamFlags f, ISeqInStream *inStream)
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69 return SeqInStream_Read(inStream, p->check, XzFlags_GetCheckSize(f));
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73 static SRes Xz_ReadIndex2(CXzStream *p, const Byte *buf, size_t size, ISzAlloc *alloc)
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75 size_t numBlocks, pos = 1;
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78 if (size < 5 || buf[0] != 0)
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79 return SZ_ERROR_ARCHIVE;
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82 crc = CrcCalc(buf, size);
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83 if (crc != GetUi32(buf + size))
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84 return SZ_ERROR_ARCHIVE;
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88 READ_VARINT_AND_CHECK(buf, pos, size, &numBlocks64);
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89 numBlocks = (size_t)numBlocks64;
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90 if (numBlocks != numBlocks64 || numBlocks * 2 > size)
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91 return SZ_ERROR_ARCHIVE;
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98 p->numBlocks = numBlocks;
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99 p->numBlocksAllocated = numBlocks;
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100 p->blocks = alloc->Alloc(alloc, sizeof(CXzBlockSizes) * numBlocks);
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101 if (p->blocks == 0)
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102 return SZ_ERROR_MEM;
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103 for (i = 0; i < numBlocks; i++)
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105 CXzBlockSizes *block = &p->blocks[i];
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106 READ_VARINT_AND_CHECK(buf, pos, size, &block->totalSize);
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107 READ_VARINT_AND_CHECK(buf, pos, size, &block->unpackSize);
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108 if (block->totalSize == 0)
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109 return SZ_ERROR_ARCHIVE;
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112 while ((pos & 3) != 0)
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113 if (buf[pos++] != 0)
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114 return SZ_ERROR_ARCHIVE;
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115 return (pos == size) ? SZ_OK : SZ_ERROR_ARCHIVE;
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118 static SRes Xz_ReadIndex(CXzStream *p, ILookInStream *stream, UInt64 indexSize, ISzAlloc *alloc)
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123 if (indexSize > ((UInt32)1 << 31))
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124 return SZ_ERROR_UNSUPPORTED;
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125 size = (size_t)indexSize;
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126 if (size != indexSize)
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127 return SZ_ERROR_UNSUPPORTED;
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128 buf = alloc->Alloc(alloc, size);
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130 return SZ_ERROR_MEM;
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131 res = LookInStream_Read2(stream, buf, size, SZ_ERROR_UNSUPPORTED);
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133 res = Xz_ReadIndex2(p, buf, size, alloc);
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134 alloc->Free(alloc, buf);
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138 static SRes LookInStream_SeekRead_ForArc(ILookInStream *stream, UInt64 offset, void *buf, size_t size)
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140 RINOK(LookInStream_SeekTo(stream, offset));
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141 return LookInStream_Read(stream, buf, size);
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142 /* return LookInStream_Read2(stream, buf, size, SZ_ERROR_NO_ARCHIVE); */
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145 static SRes Xz_ReadBackward(CXzStream *p, ILookInStream *stream, Int64 *startOffset, ISzAlloc *alloc)
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148 Byte buf[XZ_STREAM_FOOTER_SIZE];
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149 UInt64 pos = *startOffset;
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151 if ((pos & 3) != 0 || pos < XZ_STREAM_FOOTER_SIZE)
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152 return SZ_ERROR_NO_ARCHIVE;
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154 pos -= XZ_STREAM_FOOTER_SIZE;
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155 RINOK(LookInStream_SeekRead_ForArc(stream, pos, buf, XZ_STREAM_FOOTER_SIZE));
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157 if (memcmp(buf + 10, XZ_FOOTER_SIG, XZ_FOOTER_SIG_SIZE) != 0)
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160 pos += XZ_STREAM_FOOTER_SIZE;
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165 #define TEMP_BUF_SIZE (1 << 10)
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166 Byte temp[TEMP_BUF_SIZE];
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168 i = (pos > TEMP_BUF_SIZE) ? TEMP_BUF_SIZE : (size_t)pos;
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170 RINOK(LookInStream_SeekRead_ForArc(stream, pos, temp, i));
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171 total += (UInt32)i;
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172 for (; i != 0; i--)
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173 if (temp[i - 1] != 0)
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178 return SZ_ERROR_NO_ARCHIVE;
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182 if (pos < XZ_STREAM_FOOTER_SIZE || total > (1 << 16))
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183 return SZ_ERROR_NO_ARCHIVE;
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186 if (pos < XZ_STREAM_FOOTER_SIZE)
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187 return SZ_ERROR_NO_ARCHIVE;
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188 pos -= XZ_STREAM_FOOTER_SIZE;
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189 RINOK(LookInStream_SeekRead_ForArc(stream, pos, buf, XZ_STREAM_FOOTER_SIZE));
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190 if (memcmp(buf + 10, XZ_FOOTER_SIG, XZ_FOOTER_SIG_SIZE) != 0)
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191 return SZ_ERROR_NO_ARCHIVE;
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194 p->flags = (CXzStreamFlags)GetBe16(buf + 8);
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196 if (!XzFlags_IsSupported(p->flags))
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197 return SZ_ERROR_UNSUPPORTED;
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199 if (GetUi32(buf) != CrcCalc(buf + 4, 6))
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200 return SZ_ERROR_ARCHIVE;
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202 indexSize = ((UInt64)GetUi32(buf + 4) + 1) << 2;
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204 if (pos < indexSize)
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205 return SZ_ERROR_ARCHIVE;
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208 RINOK(LookInStream_SeekTo(stream, pos));
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209 RINOK(Xz_ReadIndex(p, stream, indexSize, alloc));
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212 UInt64 totalSize = Xz_GetPackSize(p);
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213 if (totalSize == XZ_SIZE_OVERFLOW
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214 || totalSize >= ((UInt64)1 << 63)
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215 || pos < totalSize + XZ_STREAM_HEADER_SIZE)
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216 return SZ_ERROR_ARCHIVE;
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217 pos -= (totalSize + XZ_STREAM_HEADER_SIZE);
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218 RINOK(LookInStream_SeekTo(stream, pos));
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219 *startOffset = pos;
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222 CXzStreamFlags headerFlags;
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223 CSecToRead secToRead;
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224 SecToRead_CreateVTable(&secToRead);
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225 secToRead.realStream = stream;
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227 RINOK(Xz_ReadHeader(&headerFlags, &secToRead.s));
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228 return (p->flags == headerFlags) ? SZ_OK : SZ_ERROR_ARCHIVE;
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233 /* ---------- Xz Streams ---------- */
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235 void Xzs_Construct(CXzs *p)
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237 p->num = p->numAllocated = 0;
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241 void Xzs_Free(CXzs *p, ISzAlloc *alloc)
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244 for (i = 0; i < p->num; i++)
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245 Xz_Free(&p->streams[i], alloc);
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246 alloc->Free(alloc, p->streams);
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247 p->num = p->numAllocated = 0;
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251 UInt64 Xzs_GetNumBlocks(const CXzs *p)
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255 for (i = 0; i < p->num; i++)
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256 num += p->streams[i].numBlocks;
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260 UInt64 Xzs_GetUnpackSize(const CXzs *p)
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264 for (i = 0; i < p->num; i++)
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265 ADD_SIZE_CHECH(size, Xz_GetUnpackSize(&p->streams[i]));
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270 UInt64 Xzs_GetPackSize(const CXzs *p)
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274 for (i = 0; i < p->num; i++)
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275 ADD_SIZE_CHECH(size, Xz_GetTotalSize(&p->streams[i]));
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280 SRes Xzs_ReadBackward(CXzs *p, ILookInStream *stream, Int64 *startOffset, ICompressProgress *progress, ISzAlloc *alloc)
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282 Int64 endOffset = 0;
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283 RINOK(stream->Seek(stream, &endOffset, SZ_SEEK_END));
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284 *startOffset = endOffset;
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290 res = Xz_ReadBackward(&st, stream, startOffset, alloc);
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291 st.startOffset = *startOffset;
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293 if (p->num == p->numAllocated)
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295 size_t newNum = p->num + p->num / 4 + 1;
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296 Byte *data = (Byte *)alloc->Alloc(alloc, newNum * sizeof(CXzStream));
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298 return SZ_ERROR_MEM;
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299 p->numAllocated = newNum;
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301 memcpy(data, p->streams, p->num * sizeof(CXzStream));
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302 alloc->Free(alloc, p->streams);
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303 p->streams = (CXzStream *)data;
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305 p->streams[p->num++] = st;
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306 if (*startOffset == 0)
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308 RINOK(LookInStream_SeekTo(stream, *startOffset));
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309 if (progress && progress->Progress(progress, endOffset - *startOffset, (UInt64)(Int64)-1) != SZ_OK)
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310 return SZ_ERROR_PROGRESS;
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