/** @file\r
- UEFI Decompress Library.\r
+ UEFI Decompress Library implementation refer to UEFI specification.\r
\r
- Copyright (c) 2006, Intel Corporation\r
+ Copyright (c) 2006 - 2008, Intel Corporation\r
All rights reserved. This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution. The full text of the license may be found at\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
- Module Name: UefiDecompressLib.c\r
-\r
**/\r
\r
-//\r
-// Decompression algorithm begins here\r
-//\r
-#define BITBUFSIZ 32\r
-#define MAXMATCH 256\r
-#define THRESHOLD 3\r
-#define CODE_BIT 16\r
-#define BAD_TABLE - 1\r
-\r
-//\r
-// C: Char&Len Set; P: Position Set; T: exTra Set\r
-//\r
-#define NC (0xff + MAXMATCH + 2 - THRESHOLD)\r
-#define CBIT 9\r
-#define MAXPBIT 5\r
-#define TBIT 5\r
-#define MAXNP ((1U << MAXPBIT) - 1)\r
-#define NT (CODE_BIT + 3)\r
-#if NT > MAXNP\r
-#define NPT NT\r
-#else\r
-#define NPT MAXNP\r
-#endif\r
-\r
-typedef struct {\r
- UINT8 *mSrcBase; ///< Starting address of compressed data\r
- UINT8 *mDstBase; ///< Starting address of decompressed data\r
- UINT32 mOutBuf;\r
- UINT32 mInBuf;\r
-\r
- UINT16 mBitCount;\r
- UINT32 mBitBuf;\r
- UINT32 mSubBitBuf;\r
- UINT16 mBlockSize;\r
- UINT32 mCompSize;\r
- UINT32 mOrigSize;\r
-\r
- UINT16 mBadTableFlag;\r
-\r
- UINT16 mLeft[2 * NC - 1];\r
- UINT16 mRight[2 * NC - 1];\r
- UINT8 mCLen[NC];\r
- UINT8 mPTLen[NPT];\r
- UINT16 mCTable[4096];\r
- UINT16 mPTTable[256];\r
-\r
- ///\r
- /// The length of the field 'Position Set Code Length Array Size' in Block Header.\r
- /// For EFI 1.1 de/compression algorithm, mPBit = 4\r
- /// For Tiano de/compression algorithm, mPBit = 5\r
- ///\r
- UINT8 mPBit;\r
-} SCRATCH_DATA;\r
+\r
+#include <Base.h>\r
+#include <Library/BaseLib.h>\r
+#include <Library/DebugLib.h>\r
+#include <Library/BaseMemoryLib.h>\r
+#include <Library/UefiDecompressLib.h>\r
+\r
+#include "BaseUefiDecompressLibInternals.h"\r
\r
/**\r
- Read NumOfBit of bits from source into mBitBuf\r
+ Read NumOfBit of bits from source into mBitBuf.\r
\r
Shift mBitBuf NumOfBits left. Read in NumOfBits of bits from source.\r
\r
}\r
\r
/**\r
- Get NumOfBits of bits out from mBitBuf\r
+ Get NumOfBits of bits out from mBitBuf.\r
\r
- Get NumOfBits of bits out from mBitBuf. Fill mBitBuf with subsequent \r
- NumOfBits of bits from source. Returns NumOfBits of bits that are \r
+ Get NumOfBits of bits out from mBitBuf. Fill mBitBuf with subsequent\r
+ NumOfBits of bits from source. Returns NumOfBits of bits that are\r
popped out.\r
\r
@param Sd The global scratch data.\r
/**\r
Creates Huffman Code mapping table according to code length array.\r
\r
- Creates Huffman Code mapping table for Extra Set, Char&Len Set \r
+ Creates Huffman Code mapping table for Extra Set, Char&Len Set\r
and Position Set according to code length array.\r
\r
@param Sd The global scratch data\r
@param NumOfChar Number of symbols in the symbol set\r
@param BitLen Code length array\r
@param TableBits The width of the mapping table\r
- @param Table The table\r
+ @param Table The table to be created.\r
\r
@retval 0 OK.\r
@retval BAD_TABLE The table is corrupted.\r
UINT16 Start[18];\r
UINT16 *Pointer;\r
UINT16 Index3;\r
- volatile UINT16 Index;\r
+ UINT16 Index;\r
UINT16 Len;\r
UINT16 Char;\r
UINT16 JuBits;\r
UINT16 Avail;\r
UINT16 NextCode;\r
UINT16 Mask;\r
+ UINT16 WordOfStart;\r
+ UINT16 WordOfCount;\r
\r
- for (Index = 1; Index <= 16; Index++) {\r
+\r
+ for (Index = 0; Index <= 16; Index++) {\r
Count[Index] = 0;\r
}\r
\r
for (Index = 0; Index < NumOfChar; Index++) {\r
Count[BitLen[Index]]++;\r
}\r
-\r
+ \r
+ Start[0] = 0;\r
Start[1] = 0;\r
\r
for (Index = 1; Index <= 16; Index++) {\r
- Start[Index + 1] = (UINT16) (Start[Index] + (Count[Index] << (16 - Index)));\r
+ WordOfStart = Start[Index];\r
+ WordOfCount = Count[Index];\r
+ Start[Index + 1] = (UINT16) (WordOfStart + (WordOfCount << (16 - Index)));\r
}\r
\r
if (Start[17] != 0) {\r
}\r
\r
JuBits = (UINT16) (16 - TableBits);\r
-\r
+ \r
+ Weight[0] = 0;\r
for (Index = 1; Index <= TableBits; Index++) {\r
Start[Index] >>= JuBits;\r
Weight[Index] = (UINT16) (1U << (TableBits - Index));\r
\r
if (Index != 0) {\r
Index3 = (UINT16) (1U << TableBits);\r
- while (Index != Index3) {\r
- Table[Index++] = 0;\r
+ if (Index < Index3) {\r
+ SetMem16 (Table + Index, (Index3 - Index) * sizeof (*Table), 0);\r
}\r
}\r
\r
for (Char = 0; Char < NumOfChar; Char++) {\r
\r
Len = BitLen[Char];\r
- if (Len == 0) {\r
+ if (Len == 0 || Len >= 17) {\r
continue;\r
}\r
\r
Index = (UINT16) (Len - TableBits);\r
\r
while (Index != 0) {\r
- if (*Pointer == 0) {\r
- Sd->mRight[Avail] = Sd->mLeft[Avail] = 0;\r
+ if (*Pointer == 0 && Avail < (2 * NC - 1)) {\r
+ Sd->mRight[Avail] = Sd->mLeft[Avail] = 0;\r
*Pointer = Avail++;\r
}\r
-\r
- if (Index3 & Mask) {\r
- Pointer = &Sd->mRight[*Pointer];\r
- } else {\r
- Pointer = &Sd->mLeft[*Pointer];\r
+ \r
+ if (*Pointer < (2 * NC - 1)) {\r
+ if ((Index3 & Mask) != 0) {\r
+ Pointer = &Sd->mRight[*Pointer];\r
+ } else {\r
+ Pointer = &Sd->mLeft[*Pointer];\r
+ }\r
}\r
\r
Index3 <<= 1;\r
Decodes a position value.\r
\r
Get a position value according to Position Huffman Table.\r
- \r
+\r
@param Sd the global scratch data\r
\r
@return The position value decoded.\r
\r
do {\r
\r
- if (Sd->mBitBuf & Mask) {\r
+ if ((Sd->mBitBuf & Mask) != 0) {\r
Val = Sd->mRight[Val];\r
} else {\r
Val = Sd->mLeft[Val];\r
{\r
UINT16 Number;\r
UINT16 CharC;\r
- volatile UINT16 Index;\r
+ UINT16 Index;\r
UINT32 Mask;\r
\r
//\r
Sd->mPTTable[Index] = CharC;\r
}\r
\r
- for (Index = 0; Index < nn; Index++) {\r
- Sd->mPTLen[Index] = 0;\r
- }\r
+ SetMem (Sd->mPTLen, nn, 0);\r
\r
return 0;\r
}\r
\r
Index = 0;\r
\r
- while (Index < Number) {\r
+ while (Index < Number && Index < NPT) {\r
\r
CharC = (UINT16) (Sd->mBitBuf >> (BITBUFSIZ - 3));\r
\r
//\r
if (Index == Special) {\r
CharC = (UINT16) GetBits (Sd, 2);\r
- while ((INT16) (--CharC) >= 0) {\r
+ while ((INT16) (--CharC) >= 0 && Index < NPT) {\r
Sd->mPTLen[Index++] = 0;\r
}\r
}\r
}\r
\r
- while (Index < nn) {\r
+ while (Index < nn && Index < NPT) {\r
Sd->mPTLen[Index++] = 0;\r
}\r
\r
\r
/**\r
Reads code lengths for Char&Len Set.\r
- \r
+\r
Read in and decode the Char&Len Set Code Length Array, then\r
generate the Huffman Code mapping table for the Char&Len Set.\r
\r
{\r
UINT16 Number;\r
UINT16 CharC;\r
- volatile UINT16 Index;\r
+ UINT16 Index;\r
UINT32 Mask;\r
\r
Number = (UINT16) GetBits (Sd, CBIT);\r
//\r
CharC = (UINT16) GetBits (Sd, CBIT);\r
\r
- for (Index = 0; Index < NC; Index++) {\r
- Sd->mCLen[Index] = 0;\r
- }\r
+ SetMem (Sd->mCLen, NC, 0);\r
\r
for (Index = 0; Index < 4096; Index++) {\r
Sd->mCTable[Index] = CharC;\r
}\r
\r
Index = 0;\r
- while (Index < Number) {\r
+ while (Index < Number && Index < NC) {\r
CharC = Sd->mPTTable[Sd->mBitBuf >> (BITBUFSIZ - 8)];\r
if (CharC >= NT) {\r
Mask = 1U << (BITBUFSIZ - 1 - 8);\r
CharC = (UINT16) (GetBits (Sd, CBIT) + 20);\r
}\r
\r
- while ((INT16) (--CharC) >= 0) {\r
+ while ((INT16) (--CharC) >= 0 && Index < NC) {\r
Sd->mCLen[Index++] = 0;\r
}\r
\r
}\r
}\r
\r
- while (Index < NC) {\r
- Sd->mCLen[Index++] = 0;\r
- }\r
+ SetMem (Sd->mCLen + Index, NC - Index, 0);\r
\r
MakeTable (Sd, NC, Sd->mCLen, 12, Sd->mCTable);\r
\r
\r
/**\r
Decode a character/length value.\r
- \r
+\r
Read one value from mBitBuf, Get one code from mBitBuf. If it is at block boundary, generates\r
Huffman code mapping table for Extra Set, Code&Len Set and\r
Position Set.\r
Mask = 1U << (BITBUFSIZ - 1 - 12);\r
\r
do {\r
- if (Sd->mBitBuf & Mask) {\r
+ if ((Sd->mBitBuf & Mask) != 0) {\r
Index2 = Sd->mRight[Index2];\r
} else {\r
Index2 = Sd->mLeft[Index2];\r
/**\r
Decode the source data and put the resulting data into the destination buffer.\r
\r
- Decode the source data and put the resulting data into the destination buffer.\r
- \r
@param Sd The global scratch data\r
\r
**/\r
// \r
CharC = DecodeC (Sd);\r
if (Sd->mBadTableFlag != 0) {\r
- return ;\r
+ goto Done;\r
}\r
\r
if (CharC < 256) {\r
// Process an Original character\r
//\r
if (Sd->mOutBuf >= Sd->mOrigSize) {\r
- return ;\r
+ goto Done;\r
} else {\r
//\r
// Write orignal character into mDstBase\r
//\r
// Process a Pointer\r
//\r
- CharC = (UINT16) (CharC - (UINT8_MAX + 1 - THRESHOLD));\r
+ CharC = (UINT16) (CharC - (BIT8 - THRESHOLD));\r
\r
//\r
// Get string length\r
while ((INT16) (BytesRemain) >= 0) {\r
Sd->mDstBase[Sd->mOutBuf++] = Sd->mDstBase[DataIdx++];\r
if (Sd->mOutBuf >= Sd->mOrigSize) {\r
- return ;\r
+ goto Done;\r
}\r
\r
BytesRemain--;\r
}\r
}\r
\r
+Done:\r
return ;\r
}\r
\r
/**\r
- Retrieves the size of the uncompressed buffer and the size of the scratch buffer.\r
+ Given a compressed source buffer, this function retrieves the size of \r
+ the uncompressed buffer and the size of the scratch buffer required \r
+ to decompress the compressed source buffer.\r
\r
Retrieves the size of the uncompressed buffer and the temporary scratch buffer \r
required to decompress the buffer specified by Source and SourceSize.\r
is required to decompress the compressed buffer specified \r
by Source and SourceSize.\r
\r
- @retval RETURN_SUCCESS The size of destination buffer and the size of scratch \r
- buffer are successull retrieved.\r
- @retval RETURN_INVALID_PARAMETER The source data is corrupted\r
-\r
+ @retval RETURN_SUCCESS The size of the uncompressed data was returned \r
+ in DestinationSize and the size of the scratch \r
+ buffer was returned in ScratchSize.\r
+ @retval RETURN_INVALID_PARAMETER \r
+ The size of the uncompressed data or the size of \r
+ the scratch buffer cannot be determined from \r
+ the compressed data specified by Source \r
+ and SourceSize.\r
**/\r
RETURN_STATUS\r
EFIAPI\r
ASSERT (DestinationSize != NULL);\r
ASSERT (ScratchSize != NULL);\r
\r
- *ScratchSize = sizeof (SCRATCH_DATA);\r
-\r
if (SourceSize < 8) {\r
return RETURN_INVALID_PARAMETER;\r
}\r
\r
- CopyMem (&CompressedSize, Source, sizeof (UINT32));\r
- CopyMem (DestinationSize, (VOID *)((UINT8 *)Source + 4), sizeof (UINT32));\r
-\r
+ CompressedSize = ReadUnaligned32 ((UINT32 *)Source);\r
if (SourceSize < (CompressedSize + 8)) {\r
return RETURN_INVALID_PARAMETER;\r
}\r
\r
+ *ScratchSize = sizeof (SCRATCH_DATA);\r
+ *DestinationSize = ReadUnaligned32 ((UINT32 *)Source + 1);\r
+\r
return RETURN_SUCCESS;\r
}\r
\r
/**\r
Decompresses a compressed source buffer.\r
\r
+ Extracts decompressed data to its original form.\r
This function is designed so that the decompression algorithm can be implemented\r
without using any memory services. As a result, this function is not allowed to\r
- call any memory allocation services in its implementation. It is the caller¡¯s r\r
- esponsibility to allocate and free the Destination and Scratch buffers.\r
- If the compressed source data specified by Source is sucessfully decompressed \r
+ call any memory allocation services in its implementation. It is the caller's \r
+ responsibility to allocate and free the Destination and Scratch buffers.\r
+ If the compressed source data specified by Source is successfully decompressed \r
into Destination, then RETURN_SUCCESS is returned. If the compressed source data \r
specified by Source is not in a valid compressed data format,\r
then RETURN_INVALID_PARAMETER is returned.\r
This is an optional parameter that may be NULL if the \r
required scratch buffer size is 0.\r
\r
- @retval RETURN_SUCCESS Decompression is successfull\r
- @retval RETURN_INVALID_PARAMETER The source data is corrupted\r
-\r
+ @retval RETURN_SUCCESS Decompression completed successfully, and \r
+ the uncompressed buffer is returned in Destination.\r
+ @retval RETURN_INVALID_PARAMETER \r
+ The source buffer specified by Source is corrupted \r
+ (not in a valid compressed format).\r
**/\r
RETURN_STATUS\r
EFIAPI\r
UefiDecompress (\r
IN CONST VOID *Source,\r
IN OUT VOID *Destination,\r
- IN OUT VOID *Scratch\r
+ IN OUT VOID *Scratch OPTIONAL\r
)\r
{\r
- volatile UINT32 Index;\r
UINT32 CompSize;\r
UINT32 OrigSize;\r
SCRATCH_DATA *Sd;\r
}\r
\r
Src = Src + 8;\r
+ SetMem (Sd, sizeof (SCRATCH_DATA), 0);\r
\r
- for (Index = 0; Index < sizeof (SCRATCH_DATA); Index++) {\r
- ((UINT8 *) Sd)[Index] = 0;\r
- }\r
//\r
// The length of the field 'Position Set Code Length Array Size' in Block Header.\r
- // For EFI 1.1 de/compression algorithm(Version 1), mPBit = 4\r
- // For Tiano de/compression algorithm(Version 2), mPBit = 5\r
+ // For UEFI 2.0 de/compression algorithm(Version 1), mPBit = 4\r
//\r
Sd->mPBit = 4;\r
Sd->mSrcBase = (UINT8 *)Src;\r
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