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249 lines
6.5 KiB
C
249 lines
6.5 KiB
C
/** @file
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Internal data structure defintions for Base UEFI Decompress Library.
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Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef __BASE_UEFI_DECOMPRESS_LIB_INTERNALS_H__
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#define __BASE_UEFI_DECOMPRESS_LIB_INTERNALS_H__
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#include <Base.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/UefiDecompressLib.h>
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//
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// Decompression algorithm begins here
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//
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#define BITBUFSIZ 32
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#define MAXMATCH 256
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#define THRESHOLD 3
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#define CODE_BIT 16
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#define BAD_TABLE - 1
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//
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// C: Char&Len Set; P: Position Set; T: exTra Set
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//
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#define NC (0xff + MAXMATCH + 2 - THRESHOLD)
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#define CBIT 9
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#define MAXPBIT 5
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#define TBIT 5
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#define MAXNP ((1U << MAXPBIT) - 1)
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#define NT (CODE_BIT + 3)
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#if NT > MAXNP
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#define NPT NT
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#else
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#define NPT MAXNP
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#endif
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typedef struct {
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UINT8 *mSrcBase; // The starting address of compressed data
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UINT8 *mDstBase; // The starting address of decompressed data
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UINT32 mOutBuf;
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UINT32 mInBuf;
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UINT16 mBitCount;
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UINT32 mBitBuf;
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UINT32 mSubBitBuf;
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UINT16 mBlockSize;
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UINT32 mCompSize;
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UINT32 mOrigSize;
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UINT16 mBadTableFlag;
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UINT16 mLeft[2 * NC - 1];
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UINT16 mRight[2 * NC - 1];
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UINT8 mCLen[NC];
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UINT8 mPTLen[NPT];
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UINT16 mCTable[4096];
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UINT16 mPTTable[256];
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///
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/// The length of the field 'Position Set Code Length Array Size' in Block Header.
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/// For UEFI 2.0 de/compression algorithm, mPBit = 4.
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/// For Tiano de/compression algorithm, mPBit = 5.
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///
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UINT8 mPBit;
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} SCRATCH_DATA;
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/**
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Read NumOfBit of bits from source into mBitBuf.
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Shift mBitBuf NumOfBits left. Read in NumOfBits of bits from source.
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@param Sd The global scratch data.
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@param NumOfBits The number of bits to shift and read.
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**/
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VOID
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FillBuf (
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IN SCRATCH_DATA *Sd,
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IN UINT16 NumOfBits
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);
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/**
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Get NumOfBits of bits out from mBitBuf.
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Get NumOfBits of bits out from mBitBuf. Fill mBitBuf with subsequent
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NumOfBits of bits from source. Returns NumOfBits of bits that are
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popped out.
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@param Sd The global scratch data.
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@param NumOfBits The number of bits to pop and read.
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@return The bits that are popped out.
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**/
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UINT32
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GetBits (
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IN SCRATCH_DATA *Sd,
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IN UINT16 NumOfBits
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);
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/**
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Creates Huffman Code mapping table according to code length array.
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Creates Huffman Code mapping table for Extra Set, Char&Len Set
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and Position Set according to code length array.
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If TableBits > 16, then ASSERT ().
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@param Sd The global scratch data.
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@param NumOfChar The number of symbols in the symbol set.
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@param BitLen Code length array.
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@param TableBits The width of the mapping table.
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@param Table The table to be created.
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@retval 0 OK.
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@retval BAD_TABLE The table is corrupted.
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**/
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UINT16
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MakeTable (
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IN SCRATCH_DATA *Sd,
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IN UINT16 NumOfChar,
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IN UINT8 *BitLen,
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IN UINT16 TableBits,
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OUT UINT16 *Table
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);
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/**
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Decodes a position value.
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Get a position value according to Position Huffman Table.
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@param Sd The global scratch data.
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@return The position value decoded.
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**/
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UINT32
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DecodeP (
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IN SCRATCH_DATA *Sd
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);
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/**
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Reads code lengths for the Extra Set or the Position Set.
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Read in the Extra Set or Position Set Length Array, then
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generate the Huffman code mapping for them.
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@param Sd The global scratch data.
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@param nn The number of symbols.
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@param nbit The number of bits needed to represent nn.
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@param Special The special symbol that needs to be taken care of.
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@retval 0 OK.
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@retval BAD_TABLE Table is corrupted.
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**/
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UINT16
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ReadPTLen (
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IN SCRATCH_DATA *Sd,
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IN UINT16 nn,
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IN UINT16 nbit,
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IN UINT16 Special
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);
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/**
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Reads code lengths for Char&Len Set.
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Read in and decode the Char&Len Set Code Length Array, then
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generate the Huffman Code mapping table for the Char&Len Set.
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@param Sd The global scratch data.
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**/
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VOID
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ReadCLen (
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SCRATCH_DATA *Sd
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);
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/**
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Decode a character/length value.
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Read one value from mBitBuf, Get one code from mBitBuf. If it is at block boundary, generates
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Huffman code mapping table for Extra Set, Code&Len Set and
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Position Set.
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@param Sd The global scratch data.
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@return The value decoded.
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**/
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UINT16
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DecodeC (
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SCRATCH_DATA *Sd
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);
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/**
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Decode the source data and put the resulting data into the destination buffer.
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@param Sd The global scratch data.
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**/
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VOID
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Decode (
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SCRATCH_DATA *Sd
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);
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/**
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Decompresses a compressed source buffer.
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Extracts decompressed data to its original form.
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This function is designed so that the decompression algorithm can be implemented
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without using any memory services. As a result, this function is not allowed to
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call any memory allocation services in its implementation. It is the caller's
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responsibility to allocate and free the Destination and Scratch buffers.
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If the compressed source data specified by Source is successfully decompressed
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into Destination, then RETURN_SUCCESS is returned. If the compressed source data
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specified by Source is not in a valid compressed data format,
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then RETURN_INVALID_PARAMETER is returned.
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If Source is NULL, then ASSERT().
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If Destination is NULL, then ASSERT().
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If the required scratch buffer size > 0 and Scratch is NULL, then ASSERT().
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@param Source The source buffer containing the compressed data.
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@param Destination The destination buffer to store the decompressed data.
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@param Scratch A temporary scratch buffer that is used to perform the decompression.
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This is an optional parameter that may be NULL if the
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required scratch buffer size is 0.
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@param Version 1 for UEFI Decompress algoruthm, 2 for Tiano Decompess algorithm.
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@retval RETURN_SUCCESS Decompression completed successfully, and
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the uncompressed buffer is returned in Destination.
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@retval RETURN_INVALID_PARAMETER
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The source buffer specified by Source is corrupted
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(not in a valid compressed format).
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**/
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RETURN_STATUS
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UefiTianoDecompress (
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IN CONST VOID *Source,
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IN OUT VOID *Destination,
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IN OUT VOID *Scratch,
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IN UINT32 Version
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);
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#endif
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