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zlib interface

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This commit is contained in:
Brian Fiete 2021-11-14 18:01:37 -08:00
parent c3644d15de
commit 345746d34d
3 changed files with 199 additions and 0 deletions
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126
BeefySysLib/util/Compress.cpp Normal file
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#include "Compress.h"
#include "third_party/zlib/zlib.h"
#include "TLSingleton.h"
#pragma warning(disable:4190)
USING_NS_BF;
bool Compression::Compress(Span<uint8> inData, Array<uint8>& outData)
{
outData.Reserve(128);
z_stream zs;
zs.zalloc = Z_NULL;
zs.zfree = Z_NULL;
zs.opaque = Z_NULL;
zs.avail_in = (int)inData.mSize;
zs.next_in = inData.mVals;
zs.next_out = outData.mVals;
zs.avail_out = outData.mAllocSize;
deflateInit(&zs, Z_BEST_COMPRESSION);
bool isDone = false;
bool hadError = false;
while (true)
{
bool isDone = zs.avail_in == 0;
int err = deflate(&zs, isDone ? Z_FINISH : Z_NO_FLUSH);
outData.mSize = (int)(zs.next_out - outData.mVals);
if (err < 0)
{
hadError = true;
break;
}
if ((isDone) && (err == Z_STREAM_END))
break;
if (zs.avail_out == 0)
{
outData.Reserve((int)outData.mAllocSize + (int)outData.mAllocSize / 2 + 1);
zs.next_out = outData.mVals + outData.mSize;
zs.avail_out = outData.mAllocSize - outData.mSize;
}
}
deflateEnd(&zs);
return !hadError;
}
bool Compression::Decompress(Span<uint8> inData, Array<uint8>& outData)
{
outData.Reserve(128);
z_stream zs;
zs.zalloc = Z_NULL;
zs.zfree = Z_NULL;
zs.opaque = Z_NULL;
zs.avail_in = (int)inData.mSize;
zs.next_in = inData.mVals;
zs.next_out = outData.mVals;
zs.avail_out = outData.mAllocSize;
inflateInit(&zs, Z_BEST_COMPRESSION);
bool isDone = false;
bool hadError = false;
while (true)
{
bool isDone = zs.avail_in == 0;
int err = inflate(&zs, isDone ? Z_FINISH : Z_NO_FLUSH);
outData.mSize = (int)(zs.next_out - outData.mVals);
if (err < 0)
{
hadError = true;
break;
}
if ((isDone) && (err == Z_STREAM_END))
break;
if (zs.avail_out == 0)
{
outData.Reserve((int)outData.mAllocSize + (int)outData.mAllocSize / 2 + 1);
zs.next_out = outData.mVals + outData.mSize;
zs.avail_out = outData.mAllocSize - outData.mSize;
}
}
inflateEnd(&zs);
return !hadError;
}
//////////////////////////////////////////////////////////////////////////
BF_EXPORT Span<uint8> BF_CALLTYPE Compression_Compress(void* ptr, int size)
{
Array<uint8> outData;
if (!Compression::Compress(Span<uint8>((uint8*)ptr, size), outData))
return Span<uint8>();
uint8* outPtr = outData.mVals;
outData.mVals = NULL;
return Span<uint8>(outPtr, outData.mSize);
}
BF_EXPORT Span<uint8> BF_CALLTYPE Compression_Decompress(void* ptr, int size)
{
Array<uint8> outData;
if (!Compression::Decompress(Span<uint8>((uint8*)ptr, size), outData))
return Span<uint8>();
uint8* outPtr = outData.mVals;
outData.mVals = NULL;
return Span<uint8>(outPtr, outData.mSize);
}
BF_EXPORT void BF_CALLTYPE Compression_Free(void* ptr)
{
delete ptr;
}