151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
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/*
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* api.c
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* Externally declared APIs
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*/
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#include <stdio.h>
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#include <crtdbg.h>
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#define DECLARE_DATA
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#include "inflate.h"
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#include "deflate.h"
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#include "api_int.h"
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#include "infgzip.h"
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#include "fasttbl.h"
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#include "crc32.h"
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// Initialise global compression
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HRESULT WINAPI InitCompression(VOID)
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{
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inflateInit();
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return S_OK;
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}
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// Initialise global decompression
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HRESULT WINAPI InitDecompression(VOID)
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{
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deflateInit();
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return S_OK;
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}
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// De-init global compression
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VOID WINAPI DeInitCompression(VOID)
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{
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}
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// De-init global decompression
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VOID WINAPI DeInitDecompression(VOID)
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{
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}
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// Create a compression context
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HRESULT WINAPI CreateCompression(PVOID *context, ULONG flags)
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{
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t_encoder_context *ec;
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*context = (PVOID) LocalAlloc(LMEM_FIXED, sizeof(t_encoder_context));
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if (*context == NULL)
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return E_OUTOFMEMORY;
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ec = (t_encoder_context *) (*context);
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// no encoders initialised yet
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ec->std_encoder = NULL;
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ec->optimal_encoder = NULL;
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ec->fast_encoder = NULL;
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if (flags & COMPRESSION_FLAG_DO_GZIP)
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ec->using_gzip = TRUE;
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else
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ec->using_gzip = FALSE;
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InternalResetCompression(ec);
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return S_OK;
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}
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// Destroy a compression context
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VOID WINAPI DestroyCompression(PVOID void_context)
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{
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t_encoder_context *context = (t_encoder_context *) void_context;
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_ASSERT(void_context != NULL);
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if (context->std_encoder != NULL)
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LocalFree((PVOID) context->std_encoder);
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if (context->optimal_encoder != NULL)
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LocalFree((PVOID) context->optimal_encoder);
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if (context->fast_encoder != NULL)
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LocalFree((PVOID) context->fast_encoder);
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LocalFree(void_context);
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}
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// Create a decompression context
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HRESULT WINAPI CreateDecompression(PVOID *context, ULONG flags)
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{
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*context = (PVOID) LocalAlloc(LMEM_FIXED, sizeof(t_decoder_context));
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if (*context == NULL)
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return E_OUTOFMEMORY;
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if (flags & DECOMPRESSION_FLAG_DO_GZIP)
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((t_decoder_context *) (*context))->using_gzip = TRUE;
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else
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((t_decoder_context *) (*context))->using_gzip = FALSE;
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return ResetDecompression(*context);
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}
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// Destroy decompression context
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VOID WINAPI DestroyDecompression(PVOID void_context)
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{
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LocalFree(void_context);
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}
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// Reset compression context
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HRESULT WINAPI ResetCompression(PVOID void_context)
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{
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t_encoder_context *context = (t_encoder_context *) void_context;
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InternalResetCompression(context);
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// BUGBUG This forces a realloc of the particular compressor we are using each time we reset, but if we don't do this then we are stuck with one
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// compressor (fast,std,optimal) forever until we destroy the context.
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// Should create a workaround for this problem. Luckily, IIS creates a new context all the time, and doesn't call reset (so says davidtr).
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DestroyIndividualCompressors(context);
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return S_OK;
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}
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// Reset decompression context
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HRESULT WINAPI ResetDecompression(PVOID void_context)
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{
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t_decoder_context *context = (t_decoder_context *) void_context;
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if (context->using_gzip)
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{
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context->state = STATE_READING_GZIP_HEADER;
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context->gzip_header_substate = 0;
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DecoderInitGzipVariables(context);
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}
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else
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{
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context->state = STATE_READING_BFINAL_NEED_TO_INIT_BITBUF;
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}
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context->bufpos = 0;
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context->bitcount = -16;
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return S_OK;
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}
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