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1. added functions header for BaseUefiDecompressLi

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2. added some internal functions header for BaseLib
3. added EFIAPI for some internal assembly files declare

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1050 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
vanjeff
2006-07-19 17:37:07 +00:00
parent ebfe209ec0
commit 1ea5ca46c7
26 changed files with 1268 additions and 62 deletions
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185
MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
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@ -69,9 +69,11 @@ typedef struct {
} SCRATCH_DATA;
/**
Read NumOfBit of bits from source into mBitBuf
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.
**/
@ -81,8 +83,14 @@ FillBuf (
IN UINT16 NumOfBits
)
{
//
// Left shift NumOfBits of bits in advance
//
Sd->mBitBuf = (UINT32) (Sd->mBitBuf << NumOfBits);
//
// Copy data needed in bytes into mSbuBitBuf
//
while (NumOfBits > Sd->mBitCount) {
Sd->mBitBuf |= (UINT32) (Sd->mSubBitBuf << (NumOfBits = (UINT16) (NumOfBits - Sd->mBitCount)));
@ -92,7 +100,6 @@ FillBuf (
// Get 1 byte into SubBitBuf
//
Sd->mCompSize--;
Sd->mSubBitBuf = 0;
Sd->mSubBitBuf = Sd->mSrcBase[Sd->mInBuf++];
Sd->mBitCount = 8;
@ -106,16 +113,25 @@ FillBuf (
}
}
//
// Caculate additional bit count read to update mBitCount
//
Sd->mBitCount = (UINT16) (Sd->mBitCount - NumOfBits);
//
// Copy NumOfBits of bits from mSubBitBuf into mBitBuf
//
Sd->mBitBuf |= Sd->mSubBitBuf >> Sd->mBitCount;
}
/**
Get NumOfBits of bits out from mBitBuf
Get NumOfBits of bits out from mBitBuf. Fill mBitBuf with subsequent
NumOfBits of bits from source. Returns NumOfBits of bits that are
popped out.
@param Sd The global scratch data.
@param Sd The global scratch data.
@param NumOfBits The number of bits to pop and read.
@return The bits that are popped out.
@ -129,8 +145,14 @@ GetBits (
{
UINT32 OutBits;
//
// Pop NumOfBits of Bits from Left
//
OutBits = (UINT32) (Sd->mBitBuf >> (BITBUFSIZ - NumOfBits));
//
// Fill up mBitBuf from source
//
FillBuf (Sd, NumOfBits);
return OutBits;
@ -139,11 +161,14 @@ GetBits (
/**
Creates Huffman Code mapping table according to code length array.
@param Sd The global scratch data
Creates Huffman Code mapping table for Extra Set, Char&Len Set
and Position Set according to code length array.
@param Sd The global scratch data
@param NumOfChar Number of symbols in the symbol set
@param BitLen Code length array
@param BitLen Code length array
@param TableBits The width of the mapping table
@param Table The table
@param Table The table
@retval 0 OK.
@retval BAD_TABLE The table is corrupted.
@ -266,6 +291,8 @@ MakeTable (
/**
Decodes a position value.
Get a position value according to Position Huffman Table.
@param Sd the global scratch data
@return The position value decoded.
@ -312,9 +339,12 @@ DecodeP (
/**
Reads code lengths for the Extra Set or the Position Set.
@param Sd The global scratch data.
@param nn Number of symbols.
@param nbit Number of bits needed to represent nn.
Read in the Extra Set or Pointion Set Length Arrary, 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 Special The special symbol that needs to be taken care of.
@retval 0 OK.
@ -334,9 +364,15 @@ ReadPTLen (
volatile UINT16 Index;
UINT32 Mask;
//
// Read Extra Set Code Length Array size
//
Number = (UINT16) GetBits (Sd, nbit);
if (Number == 0) {
//
// This represents only Huffman code used
//
CharC = (UINT16) GetBits (Sd, nbit);
for (Index = 0; Index < 256; Index++) {
@ -356,6 +392,11 @@ ReadPTLen (
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
// terminating "0". The number of "1"s = Code length - 4.
//
if (CharC == 7) {
Mask = 1U << (BITBUFSIZ - 1 - 3);
while (Mask & Sd->mBitBuf) {
@ -363,11 +404,17 @@ ReadPTLen (
CharC += 1;
}
}
FillBuf (Sd, (UINT16) ((CharC < 7) ? 3 : CharC - 3));
Sd->mPTLen[Index++] = (UINT8) CharC;
//
// 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
// zero lengths after the third length.
//
if (Index == Special) {
CharC = (UINT16) GetBits (Sd, 2);
while ((INT16) (--CharC) >= 0) {
@ -379,12 +426,15 @@ ReadPTLen (
while (Index < nn) {
Sd->mPTLen[Index++] = 0;
}
return MakeTable (Sd, nn, Sd->mPTLen, 8, Sd->mPTTable);
}
/**
Reads code lengths for Char&Len Set.
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
@ -394,14 +444,17 @@ ReadCLen (
SCRATCH_DATA *Sd
)
{
UINT16 Number;
UINT16 CharC;
UINT16 Number;
UINT16 CharC;
volatile UINT16 Index;
UINT32 Mask;
UINT32 Mask;
Number = (UINT16) GetBits (Sd, CBIT);
if (Number == 0) {
//
// This represents only Huffman code used
//
CharC = (UINT16) GetBits (Sd, CBIT);
for (Index = 0; Index < NC; Index++) {
@ -417,7 +470,6 @@ ReadCLen (
Index = 0;
while (Index < Number) {
CharC = Sd->mPTTable[Sd->mBitBuf >> (BITBUFSIZ - 8)];
if (CharC >= NT) {
Mask = 1U << (BITBUFSIZ - 1 - 8);
@ -471,6 +523,10 @@ ReadCLen (
/**
Decode a character/length value.
Read one value from mBitBuf, Get one code from mBitBuf. If it is at block boundary, generates
Huffman code mapping table for Extra Set, Code&Len Set and
Position Set.
@param Sd The global scratch data.
@ -488,21 +544,38 @@ DecodeC (
if (Sd->mBlockSize == 0) {
//
// Starting a new block
//
// Read BlockSize from block header
//
Sd->mBlockSize = (UINT16) GetBits (Sd, 16);
//
// Read in the Extra Set Code Length Arrary,
// Generate the Huffman code mapping table for Extra Set.
//
Sd->mBadTableFlag = ReadPTLen (Sd, NT, TBIT, 3);
if (Sd->mBadTableFlag != 0) {
return 0;
}
//
// Read in and decode the Char&Len Set Code Length Arrary,
// Generate the Huffman code mapping table for Char&Len Set.
//
ReadCLen (Sd);
//
// Read in the Position Set Code Length Arrary,
// Generate the Huffman code mapping table for the Position Set.
//
Sd->mBadTableFlag = ReadPTLen (Sd, MAXNP, Sd->mPBit, (UINT16) (-1));
if (Sd->mBadTableFlag != 0) {
return 0;
}
}
//
// Get one code according to Code&Set Huffman Table
//
Sd->mBlockSize--;
Index2 = Sd->mCTable[Sd->mBitBuf >> (BITBUFSIZ - 12)];
@ -530,6 +603,8 @@ DecodeC (
/**
Decode the source data and put the resulting data into the destination buffer.
Decode the source data and put the resulting data into the destination buffer.
@param Sd The global scratch data
**/
@ -547,6 +622,9 @@ Decode (
DataIdx = 0;
for (;;) {
//
// Get one code from mBitBuf
//
CharC = DecodeC (Sd);
if (Sd->mBadTableFlag != 0) {
return ;
@ -559,6 +637,9 @@ Decode (
if (Sd->mOutBuf >= Sd->mOrigSize) {
return ;
} else {
//
// Write orignal character into mDstBase
//
Sd->mDstBase[Sd->mOutBuf++] = (UINT8) CharC;
}
@ -567,11 +648,20 @@ Decode (
// Process a Pointer
//
CharC = (UINT16) (CharC - (UINT8_MAX + 1 - THRESHOLD));
//
// Get string length
//
BytesRemain = CharC;
//
// Locate string position
//
DataIdx = Sd->mOutBuf - DecodeP (Sd) - 1;
//
// Write BytesRemain of bytes into mDstBase
//
BytesRemain--;
while ((INT16) (BytesRemain) >= 0) {
Sd->mDstBase[Sd->mOutBuf++] = Sd->mDstBase[DataIdx++];
@ -588,14 +678,35 @@ Decode (
}
/**
The internal implementation of *_DECOMPRESS_PROTOCOL.GetInfo().
Retrieves the size of the uncompressed buffer and the size of the scratch buffer.
@param Source The source buffer containing the compressed data.
@param SourceSize The size of source buffer
@param DestinationSize The size of destination buffer.
@param ScratchSize The size of 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,
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
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.
@retval RETURN_SUCCESS The size of destination buffer and the size of scratch buffer are successull retrieved.
If Source is NULL, then ASSERT().
If DestinationSize is NULL, then ASSERT().
If ScratchSize is NULL, then ASSERT().
@param Source The source buffer containing the compressed data.
@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..
@param ScratchSize A pointer to the size, in bytes, of the scratch buffer that
is required to decompress the compressed buffer specified
by Source and SourceSize.
@retval RETURN_SUCCESS The size of destination buffer and the size of scratch
buffer are successull retrieved.
@retval RETURN_INVALID_PARAMETER The source data is corrupted
**/
@ -631,12 +742,27 @@ UefiDecompressGetInfo (
}
/**
The internal implementation of *_DECOMPRESS_PROTOCOL.Decompress().
Decompresses a compressed source buffer.
@param Source The source buffer containing the compressed data.
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<65><72>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
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 The buffer used internally by the decompress routine. This buffer is needed to store intermediate 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 is successfull
@retval RETURN_INVALID_PARAMETER The source data is corrupted
@ -688,6 +814,9 @@ UefiDecompress (
Sd->mPBit = 4;
Sd->mSrcBase = (UINT8 *)Src;
Sd->mDstBase = Dst;
//
// CompSize and OrigSize are caculated in bytes
//
Sd->mCompSize = CompSize;
Sd->mOrigSize = OrigSize;