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/* Licensed under the zlib/libpng license (same as NSIS) */
/*
miniz hepler module for the Nullsoft Installer (NSIS).
*/
#define WIN32_LEAN_AND_MEAN
#include <stdint.h>
#include <windows.h>
#include "miniz.h"
#include "miniz_tdef.h"
/**
* Compute the 32-bit cyclic redundancy check (CRC32) value of the
* provided data
* @param crc initial CRC32 value
* @param data pointer of a buffer containing the data
* @param len size of data in bytes
* @return CRC32 value
*/
uint32_t __declspec(dllexport) __stdcall crc32(uint32_t crc, const unsigned char *ptr, size_t buf_len)
{
return (uint32_t)(mz_crc32(crc, ptr, buf_len) & 0xffffffff);
}
/**
* Destroys the compressor context
* @param pComp pointer to compressor context information
*/
void __declspec(dllexport) __stdcall destroy(tdefl_compressor *pComp)
{
GlobalFree(pComp);
}
/**
* Allocate and acquire compressor context
* @param flags compression flags
* @return pointer of allocated and intialized compressor context which has
* to be freed by caller via destroy
*/
tdefl_compressor *__declspec(dllexport) __stdcall init(int flags)
{
tdefl_compressor *compressor = GlobalAlloc(GPTR, sizeof(tdefl_compressor));
if (compressor)
{
tdefl_status status = tdefl_init(compressor, NULL, NULL, flags);
if (status != TDEFL_STATUS_OKAY)
{
destroy(compressor);
/* Set application defined error */
SetLastError(1 << 29 | status);
compressor = NULL;
}
}
return compressor;
}
/**
* Compresses as much as possible of the data from the input buffer and write
* as much as possible of the resulting compressed data to the specified
* output buffer
* @param compressor pointer of allocated and intialized compressor context
* @param pIn_buf input buffer
* @param pIn_buf_size size of input buffer in bytes
* @param pOut_buf output buffer
* @param pOut_buf_size size of output buffer in bytes
* @param flush flag to perform flush operation
* @return negative values indicate a failure
*/
tdefl_status __declspec(dllexport) __stdcall compress(tdefl_compressor *compressor, const void *pIn_buf, size_t *pIn_buf_size, void *pOut_buf, size_t *pOut_buf_size, tdefl_flush flush)
{
return tdefl_compress(compressor, pIn_buf, pIn_buf_size, pOut_buf, pOut_buf_size, flush);
}
BOOL __stdcall DllMainCRTStartup(HINSTANCE hinstDll, DWORD dwReason, LPVOID lpReserved)
{
return TRUE;
}
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