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ZopfliDll.cpp
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ZopfliDll.cpp
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// ZopfliDll.cpp : Defines the exported functions for the DLL application.
//
#include "stdafx.h"
#include "httpcompression.h"
#include "ZopfliDll.h"
#include "CmdLine.h"
static HMODULE gzip = NULL;
static IisInitCompression ProcInitCompression = NULL;
static IisCreateCompression ProcCreateCompression = NULL;
static IisCompress ProcCompress = NULL;
static IisDestroyCompression ProcDestroyCompression = NULL;
static IisDeInitCompression ProcDeInitCompression = NULL;
//
// Initialize compression scheme
// When used with IIS, InitCompression is called once as soon
// as compression scheme dll is loaded by IIS compression module
//
extern "C" __declspec(dllexport)
HRESULT
WINAPI
InitCompression(
VOID
)
{
auto cmd_line_res = InitCmdLine();
if (cmd_line_res != S_OK) return cmd_line_res;
if (gzip == NULL)
{
auto gzip_env_path = L"%Windir%\\system32\\inetsrv\\gzip.dll";
wchar_t gzip_path[256];
auto path_len = ExpandEnvironmentStrings(gzip_env_path, gzip_path, 255);
if (path_len == 0 || path_len > 255) return E_INVALIDARG;
gzip = LoadLibrary(gzip_path);
if (gzip == NULL) return E_FAIL;
}
ProcInitCompression = (IisInitCompression)GetProcAddress(gzip, "InitCompression");
if (ProcInitCompression == NULL) return E_FAIL;
ProcCreateCompression = (IisCreateCompression)GetProcAddress(gzip, "CreateCompression");
if (ProcCreateCompression == NULL) return E_FAIL;
ProcCompress = (IisCompress)GetProcAddress(gzip, "Compress");
if (ProcCompress == NULL) return E_FAIL;
ProcDestroyCompression = (IisDestroyCompression)GetProcAddress(gzip, "DestroyCompression");
if (ProcDestroyCompression == NULL) return E_FAIL;
ProcDeInitCompression = (IisDeInitCompression)GetProcAddress(gzip, "DeInitCompression");
if (ProcDeInitCompression == NULL) return E_FAIL;
return ProcInitCompression();
}
//
// Uninitialize compression scheme
// When used with IIS, this method is called before compression
// scheme dll is unloaded by IIS compression module
//
extern "C" __declspec(dllexport)
VOID
WINAPI
DeInitCompression(
VOID
)
{
if (ProcDeInitCompression != NULL) ProcDeInitCompression();
DeInitCmdLine();
}
static const int zopfli_iterations[] = { 1, 5, 10, 15, 20 };
//
// Create a new compression context
//
extern "C" __declspec(dllexport)
HRESULT
WINAPI
CreateCompression(
OUT PVOID *context,
IN ULONG reserved
)
{
auto cc = new CompressionContext();
if (cc == NULL) return E_OUTOFMEMORY;
cc->input_buffer = NULL;
cc->output_buffer = NULL;
ZopfliInitOptions(&cc->options);
*context = cc;
auto cmd_line_res = CreateCmdLine(&cc->cmd_line_context);
if (cmd_line_res != S_OK) return cmd_line_res;
if (ProcCreateCompression == NULL) return E_FAIL;
return ProcCreateCompression(&cc->iis_compression_context, reserved);
}
//
// Compress data
//
extern "C" __declspec(dllexport)
HRESULT WINAPI Compress(
IN OUT PVOID context, // compression context
IN CONST BYTE * input_buffer, // input buffer
IN LONG input_buffer_size, // size of input buffer
IN PBYTE output_buffer, // output buffer
IN LONG output_buffer_size, // size of output buffer
OUT PLONG input_used, // amount of input buffer used
OUT PLONG output_used, // amount of output buffer used
IN INT compression_level // compression level (1...10)
)
{
if (compression_level < 0 || compression_level > 10
|| context == NULL)
return E_INVALIDARG;
auto cc = (CompressionContext *)context;
if (compression_level <= MAX_IIS_GZIP_LEVEL)
{
// do IIS compression
return ProcCompress(cc->iis_compression_context,
input_buffer, input_buffer_size, output_buffer, output_buffer_size,
input_used, output_used, compression_level * 2);
}
if (cmd_line_configured)
{
// do cmd line compression
return CmdLineCompress(cc,
input_buffer, input_buffer_size, output_buffer, output_buffer_size,
input_used, output_used, compression_level);
}
*input_used = 0;
*output_used = 0;
if (input_buffer_size > 0)
{
// copy input into our internal buffer
auto buf = (BYTE *)realloc(cc->input_buffer, cc->input_buffer_size + input_buffer_size);
if (buf == NULL) return E_OUTOFMEMORY;
cc->input_buffer = buf;
auto res = memcpy_s(cc->input_buffer + cc->input_buffer_size, input_buffer_size, input_buffer, input_buffer_size);
if (res != 0) return E_FAIL;
cc->input_buffer_size = cc->input_buffer_size + input_buffer_size;
*input_used = input_buffer_size;
}
else
{
// no more input -> compress (or continue copying compressed buffer into output)
if (cc->output_used == 0)
{
cc->options.numiterations = zopfli_iterations[compression_level - (MAX_IIS_GZIP_LEVEL + 1)];
ZopfliCompress(&cc->options, ZopfliFormat::ZOPFLI_FORMAT_GZIP, cc->input_buffer, cc->input_buffer_size, &cc->output_buffer, &cc->output_buffer_size);
if (cc->output_buffer == NULL) return E_OUTOFMEMORY;
if (cc->output_buffer_size <= 0) return E_FAIL;
}
if (cc->output_used == cc->output_buffer_size) return S_FALSE; // done
auto bytes_left = cc->output_buffer_size - cc->output_used;
auto bytes_to_copy = output_buffer_size < (LONG)bytes_left ? output_buffer_size : (LONG)bytes_left;
auto res = memcpy_s(output_buffer, output_buffer_size, cc->output_buffer + cc->output_used, bytes_to_copy);
if (res != 0) return E_FAIL;
*output_used = bytes_to_copy;
cc->output_used += bytes_to_copy;
if (cc->output_used == cc->output_buffer_size) return S_FALSE;
}
return S_OK;
}
//
// Destroy compression context
//
extern "C" __declspec(dllexport)
VOID
WINAPI
DestroyCompression(
IN PVOID context
)
{
auto cc = (CompressionContext *)context;
DestroyCmdLine(&cc->cmd_line_context);
if (cc->input_buffer != NULL)
{
free(cc->input_buffer);
cc->input_buffer = NULL;
}
cc->input_buffer_size = 0;
if (cc->output_buffer != NULL)
{
free(cc->output_buffer);
cc->output_buffer = NULL;
}
cc->output_buffer_size = 0;
cc->output_used = 0;
if (ProcDestroyCompression != NULL) ProcDestroyCompression(cc->iis_compression_context);
cc->iis_compression_context = NULL;
delete cc;
}
//
// Reset compression state
// Required export but not used on Windows Vista and Windows Server 2008 - IIS 7.0
// Deprecated and not required export for Windows 7 and Windows Server 2008 R2 - IIS 7.5
//
extern "C" __declspec(dllexport)
HRESULT
WINAPI
ResetCompression(
IN OUT PVOID context
)
{
return S_OK;
}