X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseUefiDecompressLib%2FBaseUefiDecompressLib.c;h=2f0a0c8c4507ecc96ccc1c3ca18e9cdd1c79d0c8;hb=2f88bd3a1296c522317f1c21377876de63de5be7;hp=a4b271ba04855fd5a10b8001f1849f29739fae2d;hpb=34b0820ec68fc1defe097543b57a25d8ead0eb8f;p=mirror_edk2.git
diff --git a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
index a4b271ba04..2f0a0c8c45 100644
--- a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
+++ b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
@@ -1,25 +1,12 @@
/** @file
UEFI Decompress Library implementation refer to UEFI specification.
- Copyright (c) 2006 - 2008, Intel Corporation
- All rights reserved. This program and the accompanying materials
- are licensed and made available under the terms and conditions of the BSD License
- which accompanies this distribution. The full text of the license may be found at
- http://opensource.org/licenses/bsd-license.php
-
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+ Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.
+ Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.
+ SPDX-License-Identifier: BSD-2-Clause-Patent
**/
-
-#include
-
-
-#include
-#include
-#include
-
#include "BaseUefiDecompressLibInternals.h"
/**
@@ -27,7 +14,7 @@
Shift mBitBuf NumOfBits left. Read in NumOfBits of bits from source.
- @param Sd The global scratch data
+ @param Sd The global scratch data.
@param NumOfBits The number of bits to shift and read.
**/
@@ -40,38 +27,36 @@ FillBuf (
//
// Left shift NumOfBits of bits in advance
//
- Sd->mBitBuf = (UINT32) (Sd->mBitBuf << NumOfBits);
+ Sd->mBitBuf = (UINT32)LShiftU64 (((UINT64)Sd->mBitBuf), NumOfBits);
//
// Copy data needed in bytes into mSbuBitBuf
//
while (NumOfBits > Sd->mBitCount) {
-
- Sd->mBitBuf |= (UINT32) (Sd->mSubBitBuf << (NumOfBits = (UINT16) (NumOfBits - Sd->mBitCount)));
+ NumOfBits = (UINT16)(NumOfBits - Sd->mBitCount);
+ Sd->mBitBuf |= (UINT32)LShiftU64 (((UINT64)Sd->mSubBitBuf), NumOfBits);
if (Sd->mCompSize > 0) {
//
// Get 1 byte into SubBitBuf
//
Sd->mCompSize--;
- Sd->mSubBitBuf = Sd->mSrcBase[Sd->mInBuf++];
- Sd->mBitCount = 8;
-
+ Sd->mSubBitBuf = Sd->mSrcBase[Sd->mInBuf++];
+ Sd->mBitCount = 8;
} else {
//
// No more bits from the source, just pad zero bit.
//
- Sd->mSubBitBuf = 0;
- Sd->mBitCount = 8;
-
+ Sd->mSubBitBuf = 0;
+ Sd->mBitCount = 8;
}
}
//
- // Caculate additional bit count read to update mBitCount
+ // Calculate additional bit count read to update mBitCount
//
- Sd->mBitCount = (UINT16) (Sd->mBitCount - NumOfBits);
-
+ Sd->mBitCount = (UINT16)(Sd->mBitCount - NumOfBits);
+
//
// Copy NumOfBits of bits from mSubBitBuf into mBitBuf
//
@@ -101,8 +86,8 @@ GetBits (
//
// Pop NumOfBits of Bits from Left
- //
- OutBits = (UINT32) (Sd->mBitBuf >> (BITBUFSIZ - NumOfBits));
+ //
+ OutBits = (UINT32)(Sd->mBitBuf >> (BITBUFSIZ - NumOfBits));
//
// Fill up mBitBuf from source
@@ -117,11 +102,12 @@ GetBits (
Creates Huffman Code mapping table for Extra Set, Char&Len Set
and Position Set according to code length array.
+ If TableBits > 16, then ASSERT ().
- @param Sd The global scratch data
- @param NumOfChar Number of symbols in the symbol set
- @param BitLen Code length array
- @param TableBits The width of the mapping table
+ @param Sd The global scratch data.
+ @param NumOfChar The number of symbols in the symbol set.
+ @param BitLen Code length array.
+ @param TableBits The width of the mapping table.
@param Table The table to be created.
@retval 0 OK.
@@ -142,7 +128,7 @@ MakeTable (
UINT16 Start[18];
UINT16 *Pointer;
UINT16 Index3;
- volatile UINT16 Index;
+ UINT16 Index;
UINT16 Len;
UINT16 Char;
UINT16 JuBits;
@@ -151,85 +137,99 @@ MakeTable (
UINT16 Mask;
UINT16 WordOfStart;
UINT16 WordOfCount;
+ UINT16 MaxTableLength;
+ //
+ // The maximum mapping table width supported by this internal
+ // working function is 16.
+ //
+ ASSERT (TableBits <= 16);
- for (Index = 1; Index <= 16; Index++) {
+ for (Index = 0; Index <= 16; Index++) {
Count[Index] = 0;
}
for (Index = 0; Index < NumOfChar; Index++) {
- ASSERT (BitLen[Index] != 0);
+ if (BitLen[Index] > 16) {
+ return (UINT16)BAD_TABLE;
+ }
+
Count[BitLen[Index]]++;
}
+ Start[0] = 0;
Start[1] = 0;
for (Index = 1; Index <= 16; Index++) {
- WordOfStart = Start[Index];
- WordOfCount = Count[Index];
- Start[Index + 1] = (UINT16) (WordOfStart + (WordOfCount << (16 - Index)));
+ WordOfStart = Start[Index];
+ WordOfCount = Count[Index];
+ Start[Index + 1] = (UINT16)(WordOfStart + (WordOfCount << (16 - Index)));
}
if (Start[17] != 0) {
/*(1U << 16)*/
- return (UINT16) BAD_TABLE;
+ return (UINT16)BAD_TABLE;
}
- JuBits = (UINT16) (16 - TableBits);
+ JuBits = (UINT16)(16 - TableBits);
+ Weight[0] = 0;
for (Index = 1; Index <= TableBits; Index++) {
Start[Index] >>= JuBits;
- Weight[Index] = (UINT16) (1U << (TableBits - Index));
+ Weight[Index] = (UINT16)(1U << (TableBits - Index));
}
while (Index <= 16) {
- Weight[Index] = (UINT16) (1U << (16 - Index));
- Index++;
+ Weight[Index] = (UINT16)(1U << (16 - Index));
+ Index++;
}
- Index = (UINT16) (Start[TableBits + 1] >> JuBits);
+ Index = (UINT16)(Start[TableBits + 1] >> JuBits);
if (Index != 0) {
- Index3 = (UINT16) (1U << TableBits);
- while (Index != Index3) {
- Table[Index++] = 0;
+ Index3 = (UINT16)(1U << TableBits);
+ if (Index < Index3) {
+ SetMem16 (Table + Index, (Index3 - Index) * sizeof (*Table), 0);
}
}
- Avail = NumOfChar;
- Mask = (UINT16) (1U << (15 - TableBits));
+ Avail = NumOfChar;
+ Mask = (UINT16)(1U << (15 - TableBits));
+ MaxTableLength = (UINT16)(1U << TableBits);
for (Char = 0; Char < NumOfChar; Char++) {
-
Len = BitLen[Char];
- if (Len == 0) {
+ if ((Len == 0) || (Len >= 17)) {
continue;
}
- NextCode = (UINT16) (Start[Len] + Weight[Len]);
+ NextCode = (UINT16)(Start[Len] + Weight[Len]);
if (Len <= TableBits) {
+ if ((Start[Len] >= NextCode) || (NextCode > MaxTableLength)) {
+ return (UINT16)BAD_TABLE;
+ }
for (Index = Start[Len]; Index < NextCode; Index++) {
Table[Index] = Char;
}
-
} else {
-
Index3 = Start[Len];
Pointer = &Table[Index3 >> JuBits];
- Index = (UINT16) (Len - TableBits);
+ Index = (UINT16)(Len - TableBits);
while (Index != 0) {
- if (*Pointer == 0) {
- Sd->mRight[Avail] = Sd->mLeft[Avail] = 0;
- *Pointer = Avail++;
+ if ((*Pointer == 0) && (Avail < (2 * NC - 1))) {
+ Sd->mRight[Avail] = Sd->mLeft[Avail] = 0;
+ *Pointer = Avail++;
}
- if ((Index3 & Mask) != 0) {
- Pointer = &Sd->mRight[*Pointer];
- } else {
- Pointer = &Sd->mLeft[*Pointer];
+ if (*Pointer < (2 * NC - 1)) {
+ if ((Index3 & Mask) != 0) {
+ Pointer = &Sd->mRight[*Pointer];
+ } else {
+ Pointer = &Sd->mLeft[*Pointer];
+ }
}
Index3 <<= 1;
@@ -237,11 +237,11 @@ MakeTable (
}
*Pointer = Char;
-
}
Start[Len] = NextCode;
}
+
//
// Succeeds
//
@@ -253,7 +253,7 @@ MakeTable (
Get a position value according to Position Huffman Table.
- @param Sd the global scratch data
+ @param Sd The global scratch data.
@return The position value decoded.
@@ -273,7 +273,6 @@ DecodeP (
Mask = 1U << (BITBUFSIZ - 1 - 8);
do {
-
if ((Sd->mBitBuf & Mask) != 0) {
Val = Sd->mRight[Val];
} else {
@@ -283,6 +282,7 @@ DecodeP (
Mask >>= 1;
} while (Val >= MAXNP);
}
+
//
// Advance what we have read
//
@@ -290,7 +290,7 @@ DecodeP (
Pos = Val;
if (Val > 1) {
- Pos = (UINT32) ((1U << (Val - 1)) + GetBits (Sd, (UINT16) (Val - 1)));
+ Pos = (UINT32)((1U << (Val - 1)) + GetBits (Sd, (UINT16)(Val - 1)));
}
return Pos;
@@ -299,12 +299,12 @@ DecodeP (
/**
Reads code lengths for the Extra Set or the Position Set.
- Read in the Extra Set or Pointion Set Length Arrary, then
+ Read in the Extra Set or Position Set Length Array, then
generate the Huffman code mapping for them.
@param Sd The global scratch data.
- @param nn Number of symbols.
- @param nbit Number of bits needed to represent nn.
+ @param nn The number of symbols.
+ @param nbit The number of bits needed to represent nn.
@param Special The special symbol that needs to be taken care of.
@retval 0 OK.
@@ -321,40 +321,36 @@ ReadPTLen (
{
UINT16 Number;
UINT16 CharC;
- volatile UINT16 Index;
+ UINT16 Index;
UINT32 Mask;
+ ASSERT (nn <= NPT);
//
- // Read Extra Set Code Length Array size
+ // Read Extra Set Code Length Array size
//
- Number = (UINT16) GetBits (Sd, nbit);
+ Number = (UINT16)GetBits (Sd, nbit);
if (Number == 0) {
//
// This represents only Huffman code used
//
- CharC = (UINT16) GetBits (Sd, nbit);
+ CharC = (UINT16)GetBits (Sd, nbit);
- for (Index = 0; Index < 256; Index++) {
- Sd->mPTTable[Index] = CharC;
- }
+ SetMem16 (&Sd->mPTTable[0], sizeof (Sd->mPTTable), CharC);
- for (Index = 0; Index < nn; Index++) {
- Sd->mPTLen[Index] = 0;
- }
+ SetMem (Sd->mPTLen, nn, 0);
return 0;
}
Index = 0;
- while (Index < Number) {
-
- CharC = (UINT16) (Sd->mBitBuf >> (BITBUFSIZ - 3));
+ while (Index < Number && Index < NPT) {
+ CharC = (UINT16)(Sd->mBitBuf >> (BITBUFSIZ - 3));
//
// If a code length is less than 7, then it is encoded as a 3-bit
- // value. Or it is encoded as a series of "1"s followed by a
+ // value. Or it is encoded as a series of "1"s followed by a
// terminating "0". The number of "1"s = Code length - 4.
//
if (CharC == 7) {
@@ -364,29 +360,29 @@ ReadPTLen (
CharC += 1;
}
}
-
- FillBuf (Sd, (UINT16) ((CharC < 7) ? 3 : CharC - 3));
- Sd->mPTLen[Index++] = (UINT8) CharC;
-
+ FillBuf (Sd, (UINT16)((CharC < 7) ? 3 : CharC - 3));
+
+ Sd->mPTLen[Index++] = (UINT8)CharC;
+
//
- // For Code&Len Set,
+ // For Code&Len Set,
// After the third length of the code length concatenation,
- // a 2-bit value is used to indicated the number of consecutive
+ // a 2-bit value is used to indicated the number of consecutive
// zero lengths after the third length.
//
if (Index == Special) {
- CharC = (UINT16) GetBits (Sd, 2);
- while ((INT16) (--CharC) >= 0) {
+ CharC = (UINT16)GetBits (Sd, 2);
+ while ((INT16)(--CharC) >= 0 && Index < NPT) {
Sd->mPTLen[Index++] = 0;
}
}
}
- while (Index < nn) {
+ while (Index < nn && Index < NPT) {
Sd->mPTLen[Index++] = 0;
}
-
+
return MakeTable (Sd, nn, Sd->mPTLen, 8, Sd->mPTTable);
}
@@ -396,7 +392,7 @@ ReadPTLen (
Read in and decode the Char&Len Set Code Length Array, then
generate the Huffman Code mapping table for the Char&Len Set.
- @param Sd the global scratch data
+ @param Sd The global scratch data.
**/
VOID
@@ -404,38 +400,32 @@ ReadCLen (
SCRATCH_DATA *Sd
)
{
- UINT16 Number;
- UINT16 CharC;
- volatile UINT16 Index;
- UINT32 Mask;
+ UINT16 Number;
+ UINT16 CharC;
+ UINT16 Index;
+ UINT32 Mask;
- Number = (UINT16) GetBits (Sd, CBIT);
+ Number = (UINT16)GetBits (Sd, CBIT);
if (Number == 0) {
//
// This represents only Huffman code used
//
- CharC = (UINT16) GetBits (Sd, CBIT);
+ CharC = (UINT16)GetBits (Sd, CBIT);
- for (Index = 0; Index < NC; Index++) {
- Sd->mCLen[Index] = 0;
- }
-
- for (Index = 0; Index < 4096; Index++) {
- Sd->mCTable[Index] = CharC;
- }
+ SetMem (Sd->mCLen, NC, 0);
+ SetMem16 (&Sd->mCTable[0], sizeof (Sd->mCTable), CharC);
- return ;
+ return;
}
Index = 0;
- while (Index < Number) {
+ while (Index < Number && Index < NC) {
CharC = Sd->mPTTable[Sd->mBitBuf >> (BITBUFSIZ - 8)];
if (CharC >= NT) {
Mask = 1U << (BITBUFSIZ - 1 - 8);
do {
-
if (Mask & Sd->mBitBuf) {
CharC = Sd->mRight[CharC];
} else {
@@ -443,42 +433,36 @@ ReadCLen (
}
Mask >>= 1;
-
} while (CharC >= NT);
}
+
//
// Advance what we have read
//
FillBuf (Sd, Sd->mPTLen[CharC]);
if (CharC <= 2) {
-
if (CharC == 0) {
CharC = 1;
} else if (CharC == 1) {
- CharC = (UINT16) (GetBits (Sd, 4) + 3);
+ CharC = (UINT16)(GetBits (Sd, 4) + 3);
} else if (CharC == 2) {
- CharC = (UINT16) (GetBits (Sd, CBIT) + 20);
+ CharC = (UINT16)(GetBits (Sd, CBIT) + 20);
}
- while ((INT16) (--CharC) >= 0) {
+ while ((INT16)(--CharC) >= 0 && Index < NC) {
Sd->mCLen[Index++] = 0;
}
-
} else {
-
- Sd->mCLen[Index++] = (UINT8) (CharC - 2);
-
+ Sd->mCLen[Index++] = (UINT8)(CharC - 2);
}
}
- while (Index < NC) {
- Sd->mCLen[Index++] = 0;
- }
+ SetMem (Sd->mCLen + Index, NC - Index, 0);
MakeTable (Sd, NC, Sd->mCLen, 12, Sd->mCTable);
- return ;
+ return;
}
/**
@@ -505,11 +489,11 @@ DecodeC (
//
// Starting a new block
// Read BlockSize from block header
- //
- Sd->mBlockSize = (UINT16) GetBits (Sd, 16);
+ //
+ Sd->mBlockSize = (UINT16)GetBits (Sd, 16);
//
- // Read in the Extra Set Code Length Arrary,
+ // Read in the Extra Set Code Length Array,
// Generate the Huffman code mapping table for Extra Set.
//
Sd->mBadTableFlag = ReadPTLen (Sd, NT, TBIT, 3);
@@ -518,16 +502,16 @@ DecodeC (
}
//
- // Read in and decode the Char&Len Set Code Length Arrary,
+ // Read in and decode the Char&Len Set Code Length Array,
// Generate the Huffman code mapping table for Char&Len Set.
//
ReadCLen (Sd);
//
- // Read in the Position Set Code Length Arrary,
+ // Read in the Position Set Code Length Array,
// Generate the Huffman code mapping table for the Position Set.
//
- Sd->mBadTableFlag = ReadPTLen (Sd, MAXNP, Sd->mPBit, (UINT16) (-1));
+ Sd->mBadTableFlag = ReadPTLen (Sd, MAXNP, Sd->mPBit, (UINT16)(-1));
if (Sd->mBadTableFlag != 0) {
return 0;
}
@@ -552,6 +536,7 @@ DecodeC (
Mask >>= 1;
} while (Index2 >= NC);
}
+
//
// Advance what we have read
//
@@ -563,7 +548,7 @@ DecodeC (
/**
Decode the source data and put the resulting data into the destination buffer.
- @param Sd The global scratch data
+ @param Sd The global scratch data.
**/
VOID
@@ -575,14 +560,14 @@ Decode (
UINT32 DataIdx;
UINT16 CharC;
- BytesRemain = (UINT16) (-1);
+ BytesRemain = (UINT16)(-1);
- DataIdx = 0;
+ DataIdx = 0;
- for (;;) {
+ for ( ; ;) {
//
// Get one code from mBitBuf
- //
+ //
CharC = DecodeC (Sd);
if (Sd->mBadTableFlag != 0) {
goto Done;
@@ -598,15 +583,14 @@ Decode (
//
// Write orignal character into mDstBase
//
- Sd->mDstBase[Sd->mOutBuf++] = (UINT8) CharC;
+ Sd->mDstBase[Sd->mOutBuf++] = (UINT8)CharC;
}
-
} else {
//
// Process a Pointer
//
- CharC = (UINT16) (CharC - (BIT8 - THRESHOLD));
-
+ CharC = (UINT16)(CharC - (BIT8 - THRESHOLD));
+
//
// Get string length
//
@@ -615,40 +599,54 @@ Decode (
//
// Locate string position
//
- DataIdx = Sd->mOutBuf - DecodeP (Sd) - 1;
+ DataIdx = Sd->mOutBuf - DecodeP (Sd) - 1;
//
// Write BytesRemain of bytes into mDstBase
//
BytesRemain--;
- while ((INT16) (BytesRemain) >= 0) {
- Sd->mDstBase[Sd->mOutBuf++] = Sd->mDstBase[DataIdx++];
+
+ while ((INT16)(BytesRemain) >= 0) {
if (Sd->mOutBuf >= Sd->mOrigSize) {
goto Done;
}
+ if (DataIdx >= Sd->mOrigSize) {
+ Sd->mBadTableFlag = (UINT16)BAD_TABLE;
+ goto Done;
+ }
+
+ Sd->mDstBase[Sd->mOutBuf++] = Sd->mDstBase[DataIdx++];
+
BytesRemain--;
}
+
+ //
+ // Once mOutBuf is fully filled, directly return
+ //
+ if (Sd->mOutBuf >= Sd->mOrigSize) {
+ goto Done;
+ }
}
}
Done:
- return ;
+ return;
}
/**
- Given a compressed source buffer, this function retrieves the size of
- the uncompressed buffer and the size of the scratch buffer required
+ Given a compressed source buffer, this function retrieves the size of
+ the uncompressed buffer and the size of the scratch buffer required
to decompress the compressed source buffer.
- Retrieves the size of the uncompressed buffer and the temporary scratch buffer
+ Retrieves the size of the uncompressed buffer and the temporary scratch buffer
required to decompress the buffer specified by Source and SourceSize.
If the size of the uncompressed buffer or the size of the scratch buffer cannot
- be determined from the compressed data specified by Source and SourceData,
+ be determined from the compressed data specified by Source and SourceData,
then RETURN_INVALID_PARAMETER is returned. Otherwise, the size of the uncompressed
buffer is returned in DestinationSize, the size of the scratch buffer is returned
in ScratchSize, and RETURN_SUCCESS is returned.
- This function does not have scratch buffer available to perform a thorough
+ This function does not have scratch buffer available to perform a thorough
checking of the validity of the source data. It just retrieves the "Original Size"
field from the beginning bytes of the source data and output it as DestinationSize.
And ScratchSize is specific to the decompression implementation.
@@ -661,18 +659,18 @@ Done:
@param SourceSize The size, in bytes, of the source buffer.
@param DestinationSize A pointer to the size, in bytes, of the uncompressed buffer
that will be generated when the compressed buffer specified
- by Source and SourceSize is decompressed..
+ by Source and SourceSize is decompressed.
@param ScratchSize A pointer to the size, in bytes, of the scratch buffer that
- is required to decompress the compressed buffer specified
+ is required to decompress the compressed buffer specified
by Source and SourceSize.
- @retval RETURN_SUCCESS The size of the uncompressed data was returned
- in DestinationSize and the size of the scratch
+ @retval RETURN_SUCCESS The size of the uncompressed data was returned
+ in DestinationSize, and the size of the scratch
buffer was returned in ScratchSize.
- @retval RETURN_INVALID_PARAMETER
- The size of the uncompressed data or the size of
- the scratch buffer cannot be determined from
- the compressed data specified by Source
+ @retval RETURN_INVALID_PARAMETER
+ The size of the uncompressed data or the size of
+ the scratch buffer cannot be determined from
+ the compressed data specified by Source
and SourceSize.
**/
RETURN_STATUS
@@ -694,12 +692,12 @@ UefiDecompressGetInfo (
return RETURN_INVALID_PARAMETER;
}
- CompressedSize = ReadUnaligned32 ((UINT32 *)Source);
- if (SourceSize < (CompressedSize + 8)) {
+ CompressedSize = ReadUnaligned32 ((UINT32 *)Source);
+ if ((SourceSize < (CompressedSize + 8)) || ((CompressedSize + 8) < 8)) {
return RETURN_INVALID_PARAMETER;
}
- *ScratchSize = sizeof (SCRATCH_DATA);
+ *ScratchSize = sizeof (SCRATCH_DATA);
*DestinationSize = ReadUnaligned32 ((UINT32 *)Source + 1);
return RETURN_SUCCESS;
@@ -711,55 +709,57 @@ UefiDecompressGetInfo (
Extracts decompressed data to its original form.
This function is designed so that the decompression algorithm can be implemented
without using any memory services. As a result, this function is not allowed to
- call any memory allocation services in its implementation. It is the caller's r
- esponsibility to allocate and free the Destination and Scratch buffers.
- If the compressed source data specified by Source is sucessfully decompressed
- into Destination, then RETURN_SUCCESS is returned. If the compressed source data
+ call any memory allocation services in its implementation. It is the caller's
+ responsibility to allocate and free the Destination and Scratch buffers.
+ If the compressed source data specified by Source is successfully decompressed
+ into Destination, then RETURN_SUCCESS is returned. If the compressed source data
specified by Source is not in a valid compressed data format,
then RETURN_INVALID_PARAMETER is returned.
If Source is NULL, then ASSERT().
If Destination is NULL, then ASSERT().
If the required scratch buffer size > 0 and Scratch is NULL, then ASSERT().
+ If the Version is not 1 or 2, then ASSERT().
@param Source The source buffer containing the compressed data.
- @param Destination The destination buffer to store the decompressed data
+ @param Destination The destination buffer to store the decompressed data.
@param Scratch A temporary scratch buffer that is used to perform the decompression.
- This is an optional parameter that may be NULL if the
+ This is an optional parameter that may be NULL if the
required scratch buffer size is 0.
-
- @retval RETURN_SUCCESS Decompression completed successfully, and
+ @param Version 1 for UEFI Decompress algoruthm, 2 for Tiano Decompess algorithm.
+
+ @retval RETURN_SUCCESS Decompression completed successfully, and
the uncompressed buffer is returned in Destination.
- @retval RETURN_INVALID_PARAMETER
- The source buffer specified by Source is corrupted
+ @retval RETURN_INVALID_PARAMETER
+ The source buffer specified by Source is corrupted
(not in a valid compressed format).
**/
RETURN_STATUS
-EFIAPI
-UefiDecompress (
+UefiTianoDecompress (
IN CONST VOID *Source,
IN OUT VOID *Destination,
- IN OUT VOID *Scratch OPTIONAL
+ IN OUT VOID *Scratch,
+ IN UINT32 Version
)
{
- volatile UINT32 Index;
- UINT32 CompSize;
- UINT32 OrigSize;
- SCRATCH_DATA *Sd;
- CONST UINT8 *Src;
- UINT8 *Dst;
+ UINT32 CompSize;
+ UINT32 OrigSize;
+ SCRATCH_DATA *Sd;
+ CONST UINT8 *Src;
+ UINT8 *Dst;
ASSERT (Source != NULL);
ASSERT (Destination != NULL);
ASSERT (Scratch != NULL);
+ ASSERT (Version == 1 || Version == 2);
- Src = Source;
- Dst = Destination;
+ Src = Source;
+ Dst = Destination;
- Sd = (SCRATCH_DATA *) Scratch;
+ Sd = (SCRATCH_DATA *)Scratch;
- CompSize = Src[0] + (Src[1] << 8) + (Src[2] << 16) + (Src[3] << 24);
- OrigSize = Src[4] + (Src[5] << 8) + (Src[6] << 16) + (Src[7] << 24);
+ CompSize = Src[0] + (Src[1] << 8) + (Src[2] << 16) + (Src[3] << 24);
+ OrigSize = Src[4] + (Src[5] << 8) + (Src[6] << 16) + (Src[7] << 24);
//
// If compressed file size is 0, return
@@ -769,19 +769,28 @@ UefiDecompress (
}
Src = Src + 8;
+ SetMem (Sd, sizeof (SCRATCH_DATA), 0);
- for (Index = 0; Index < sizeof (SCRATCH_DATA); Index++) {
- ((UINT8 *) Sd)[Index] = 0;
- }
//
// The length of the field 'Position Set Code Length Array Size' in Block Header.
// For UEFI 2.0 de/compression algorithm(Version 1), mPBit = 4
+ // For Tiano de/compression algorithm(Version 2), mPBit = 5
//
- Sd->mPBit = 4;
- Sd->mSrcBase = (UINT8 *)Src;
- Sd->mDstBase = Dst;
+ switch (Version) {
+ case 1:
+ Sd->mPBit = 4;
+ break;
+ case 2:
+ Sd->mPBit = 5;
+ break;
+ default:
+ ASSERT (FALSE);
+ }
+
+ Sd->mSrcBase = (UINT8 *)Src;
+ Sd->mDstBase = Dst;
//
- // CompSize and OrigSize are caculated in bytes
+ // CompSize and OrigSize are calculated in bytes
//
Sd->mCompSize = CompSize;
Sd->mOrigSize = OrigSize;
@@ -805,3 +814,43 @@ UefiDecompress (
return RETURN_SUCCESS;
}
+
+/**
+ Decompresses a UEFI compressed source buffer.
+
+ Extracts decompressed data to its original form.
+ This function is designed so that the decompression algorithm can be implemented
+ without using any memory services. As a result, this function is not allowed to
+ call any memory allocation services in its implementation. It is the caller's
+ responsibility to allocate and free the Destination and Scratch buffers.
+ If the compressed source data specified by Source is successfully decompressed
+ into Destination, then RETURN_SUCCESS is returned. If the compressed source data
+ specified by Source is not in a valid compressed data format,
+ then RETURN_INVALID_PARAMETER is returned.
+
+ If Source is NULL, then ASSERT().
+ If Destination is NULL, then ASSERT().
+ If the required scratch buffer size > 0 and Scratch is NULL, then ASSERT().
+
+ @param Source The source buffer containing the compressed data.
+ @param Destination The destination buffer to store the decompressed data
+ @param Scratch A temporary scratch buffer that is used to perform the decompression.
+ This is an optional parameter that may be NULL if the
+ required scratch buffer size is 0.
+
+ @retval RETURN_SUCCESS Decompression completed successfully, and
+ the uncompressed buffer is returned in Destination.
+ @retval RETURN_INVALID_PARAMETER
+ The source buffer specified by Source is corrupted
+ (not in a valid compressed format).
+**/
+RETURN_STATUS
+EFIAPI
+UefiDecompress (
+ IN CONST VOID *Source,
+ IN OUT VOID *Destination,
+ IN OUT VOID *Scratch OPTIONAL
+ )
+{
+ return UefiTianoDecompress (Source, Destination, Scratch, 1);
+}