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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/boot/sbeDecompression.h $ */
/* */
/* OpenPOWER sbe Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2017 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
uint8_t decompress(uint8_t * compBuffer, uint8_t * decompBuffer)
{
uint8_t rc = 0;
do
{
uint32_t iCount = 0;
int32_t jCount = 0;
uint32_t dict[256];
for(iCount = 0; iCount < 256; iCount++)
{
uint64_t temp = *(uint64_t *)compBuffer;
dict[iCount] = (uint32_t)(((temp) & 0xFFFFFFFF00000000LL) >> 32);
++iCount;
dict[iCount] = (uint32_t)(((temp) & 0xFFFFFFFFLL));
compBuffer = compBuffer + 8;
}
//Get the file size.
uint64_t compfileSize = *((uint64_t * )compBuffer);
compBuffer = compBuffer + 8;
uint32_t quo = compfileSize / 128;
uint32_t rem = compfileSize % (128);
uint32_t bitCount;
if(rem == 0)
bitCount = quo;
else
bitCount = quo + 1;
uint32_t bitArray[bitCount];
for(iCount = 0; iCount < bitCount; iCount++)
{
uint64_t temp = *(uint64_t *)compBuffer;
bitArray[iCount] = (uint32_t)(((temp) & 0xFFFFFFFF00000000LL) >> 32);
++iCount;
bitArray[iCount] = (uint32_t)((temp) & 0xFFFFFFFFLL);
compBuffer = compBuffer + 8;
}
uint64_t eightByte = *(uint64_t *)compBuffer;
uint8_t *ptr = (uint8_t *)&eightByte;
compBuffer = compBuffer + 8;
uint32_t kCount = 0;
for(iCount = 0; iCount < bitCount ; iCount++)
{
//Extract a bit from 32 bit integer.
int32_t j = 31;
if((iCount == bitCount - 1) && (rem != 0))
j = rem/4 -1;
for (jCount = j; jCount >= 0; jCount--)
{
char isCompressed = (bitArray[iCount] >> jCount) & 1;
if(isCompressed == 1)
{
//Read a byte.
uint8_t index = *(ptr + kCount);
++kCount;
if(kCount == 8)
{
eightByte = *(uint64_t *)compBuffer;
compBuffer = compBuffer + 8;
kCount = 0;
}
uint32_t value = dict[index];
uint32_t * pTemp = (uint32_t *) decompBuffer;
*pTemp = value;
decompBuffer = decompBuffer + 4;
}
else
{
//Read four bytes.
uint8_t i;
for(i = 0; i < 4; i++)
{
*decompBuffer = *(ptr + kCount);
++kCount;
if(kCount == 8)
{
eightByte = *(uint64_t *)compBuffer;
compBuffer = compBuffer + 8;
kCount = 0;
}
++decompBuffer;
}
}// else
}// loop ends for (jCount = j; jCount >= 0; jCount--)
}//loops ends for (iCount = 0; iCount < bitCount ; iCount++)
} while(0);
return rc;
}
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