code_app/modules/imgfmt/HGPdfImpl.cpp

#include "HGPdfImpl.hpp"
#include "../base/HGInc.h"
#include "../base/HGUtility.h"
#include "../base/HGInfo.h"
#include "HGString.h"
#include <string>
#include <iostream>

HGPdfReaderImpl::HGPdfReaderImpl()
{
	m_dll = NULL;
	m_pContext = NULL;
	m_pDoc = NULL;
}

HGPdfReaderImpl::~HGPdfReaderImpl()
{

}

HGResult HGPdfReaderImpl::Open(const HGChar* fileName)
{
	if (NULL != m_pDoc)
	{
		return HGBASE_ERR_FAIL;
	}

	if (NULL == fileName)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGBool isPdfFile = HGFALSE;
	FILE* file = fopen(fileName, "r");
	if (NULL != file)
	{
		HGByte data[4];
		size_t len = fread(data, 1, 4, file);
		if (4 == len && 0 == memcmp(data, "%PDF", 4))
		{
			isPdfFile = HGTRUE;
		}

		fclose(file);
	}

	if (!isPdfFile)
	{
		return HGBASE_ERR_FAIL;
	}

	assert(NULL == m_dll);

	HGChar moduleName[256];
	HGBase_GetModuleName((void *)HGImgFmt_OpenPdfReader, moduleName, 256);
	HGChar dllPath[256];
	HGBase_GetFilePath(moduleName, dllPath, 256);

#if defined(HG_CMP_MSC)
	strcat(dllPath, "libmupdf.dll");
#else
	strcat(dllPath, "libmupdf.so");
#endif
	HGResult ret = HGBase_CreateDll(dllPath, &m_dll);
	if (HGBASE_ERR_OK != ret)
	{
		HGBase_WriteInfo(HGBASE_INFOTYPE_DESC, "Load PDF Library Failed, path=%s", dllPath);
		return ret;
	}

	fz_context* pContext = fz_new_context(NULL, NULL, FZ_STORE_DEFAULT);
	if (NULL == pContext)
	{
		HGBase_DestroyDll(m_dll);
		m_dll = NULL;
		return HGBASE_ERR_FAIL;
	}

	ret = HGBASE_ERR_FAIL;
	fz_try(pContext)
	{
		fz_register_document_handlers(pContext);
		fz_document* pDoc = fz_open_document(pContext, StdStringToUtf8(fileName).c_str());

		m_pContext = pContext;
		m_pDoc = pDoc;
		ret = HGBASE_ERR_OK;
	}
	fz_catch(pContext)
	{
		fz_drop_context(pContext);
		pContext = NULL;
		HGBase_DestroyDll(m_dll);
		m_dll = NULL;
	}

	return ret;
}

HGResult HGPdfReaderImpl::Close()
{
	if (NULL == m_pDoc)
	{
		return HGBASE_ERR_FAIL;
	}

	fz_drop_document(m_pContext, m_pDoc);
	m_pDoc = NULL;
	fz_drop_context(m_pContext);
	m_pContext = NULL;
	HGBase_DestroyDll(m_dll);
	m_dll = NULL;
	return HGBASE_ERR_OK;
}

HGResult HGPdfReaderImpl::GetPageCount(HGUInt* count)
{
	if (NULL == m_pDoc)
	{
		return HGBASE_ERR_FAIL;
	}

	if (NULL == count)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGResult ret = HGBASE_ERR_FAIL;
	fz_try(m_pContext)
	{
		*count = (uint32_t)fz_count_pages(m_pContext, m_pDoc);
		ret = HGBASE_ERR_OK;
	}
	fz_catch(m_pContext)
	{

	}

	return ret;
}

HGResult HGPdfReaderImpl::GetPageInfo(HGUInt page, HGPdfPageInfo* info)
{
	if (NULL == m_pDoc)
	{
		return HGBASE_ERR_FAIL;
	}

	if (NULL == info)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGResult ret = HGBASE_ERR_FAIL;
	fz_page* fzpage = NULL;

	fz_try(m_pContext)
	{
		fzpage = fz_load_page(m_pContext, m_pDoc, (int)page);
		pdf_page* page = pdf_page_from_fz_page(m_pContext, fzpage);
		if (NULL != page)
		{
			fz_rect pdfRect = pdf_bound_page(m_pContext, page);
			info->width = ceil(pdfRect.x1);
			info->height = ceil(pdfRect.y1);
			info->bpp = 24;
			ret = HGBASE_ERR_OK;
		}
	}
	fz_catch(m_pContext)
	{

	}

	if (NULL != fzpage)
		fz_drop_page(m_pContext, fzpage);
	return ret;
}

HGResult HGPdfReaderImpl::LoadImage(HGUInt page, HGFloat xScale, HGFloat yScale,
	HGUInt imgType, HGUInt imgOrigin, HGImage* image)
{
	if (NULL == m_pDoc)
	{
		return HGBASE_ERR_FAIL;
	}

	if (HGBASE_IMGORIGIN_TOP != imgOrigin && HGBASE_IMGORIGIN_BOTTOM != imgOrigin)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	if (NULL == image)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGResult ret = HGBASE_ERR_FAIL;
	fz_pixmap* pix = NULL;

	fz_try(m_pContext)
	{
		fz_matrix ctm = fz_scale(xScale, yScale);
		pix = fz_new_pixmap_from_page_number(m_pContext, m_pDoc, (int)page,
			ctm, fz_device_rgb(m_pContext), 0);

		int width = fz_pixmap_width(m_pContext, pix);
		int height = fz_pixmap_height(m_pContext, pix);

		if (0 == imgType)
			imgType = HGBASE_IMGTYPE_RGB;

		HGImage image2 = NULL;
		HGImageInfo imgInfo = { (uint32_t)width, (uint32_t)height, HGBASE_IMGTYPE_RGB, (uint32_t)pix->stride, HGBASE_IMGORIGIN_TOP };
		if (HGBASE_ERR_OK == HGBase_CreateImageWithData(pix->samples, &imgInfo, &image2))
		{
			ret = HGBase_CloneImage(image2, imgType, imgOrigin, image);
			HGBase_DestroyImage(image2);
		}

	}
	fz_catch(m_pContext)
	{

	}

	if (NULL != pix)
		fz_drop_pixmap(m_pContext, pix);
	return ret;
}

fz_context* HGPdfReaderImpl::fz_new_context_imp(const fz_alloc_context* alloc, const fz_locks_context* locks, size_t max_store, const char* version)
{
	typedef fz_context* (*Func)(const fz_alloc_context*, const fz_locks_context*, size_t, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_new_context_imp", (HGPointer*)&func);
	if (NULL == func)
	{
		return NULL;
	}

	return func(alloc, locks, max_store, version);
}

void HGPdfReaderImpl::fz_register_document_handlers(fz_context* ctx)
{
	typedef void (*Func)(fz_context*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_register_document_handlers", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(ctx);
}

fz_document* HGPdfReaderImpl::fz_open_document(fz_context* ctx, const char* filename)
{
	typedef fz_document* (*Func)(fz_context*, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_open_document", (HGPointer*)&func);
	if (NULL == func)
	{
		return NULL;
	}

	return func(ctx, filename);
}

void HGPdfReaderImpl::fz_drop_context(fz_context* ctx)
{
	typedef void (*Func)(fz_context*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_drop_context", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(ctx);
}

void HGPdfReaderImpl::fz_drop_document(fz_context* ctx, fz_document* doc)
{
	typedef void (*Func)(fz_context*, fz_document*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_drop_document", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(ctx, doc);
}

int HGPdfReaderImpl::fz_count_pages(fz_context* ctx, fz_document* doc)
{
	typedef int (*Func)(fz_context*, fz_document*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_count_pages", (HGPointer*)&func);
	if (NULL == func)
	{
		return -1;
	}

	return func(ctx, doc);
}

fz_page* HGPdfReaderImpl::fz_load_page(fz_context* ctx, fz_document* doc, int number)
{
	typedef fz_page* (*Func)(fz_context*, fz_document* doc, int);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_load_page", (HGPointer*)&func);
	if (NULL == func)
	{
		return NULL;
	}

	return func(ctx, doc, number);
}

pdf_page* HGPdfReaderImpl::pdf_page_from_fz_page(fz_context* ctx, fz_page* ptr)
{
	typedef pdf_page* (*Func)(fz_context*, fz_page*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "pdf_page_from_fz_page", (HGPointer*)&func);
	if (NULL == func)
	{
		return NULL;
	}

	return func(ctx, ptr);
}

fz_rect HGPdfReaderImpl::pdf_bound_page(fz_context* ctx, pdf_page* page)
{
	typedef fz_rect (*Func)(fz_context*, pdf_page*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "pdf_bound_page", (HGPointer*)&func);
	if (NULL == func)
	{
		fz_rect rect = {0, 0, 0, 0};
		return rect;
	}

	return func(ctx, page);
}

void HGPdfReaderImpl::fz_drop_page(fz_context* ctx, fz_page* page)
{
	typedef void (*Func)(fz_context*, fz_page*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_drop_page", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(ctx, page);
}

fz_matrix HGPdfReaderImpl::fz_scale(float sx, float sy)
{
	typedef fz_matrix (*Func)(float, float);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_scale", (HGPointer*)&func);
	if (NULL == func)
	{
		fz_matrix matrix = { 0, 0, 0, 0, 0, 0 };
		return matrix;
	}

	return func(sx, sy);
}

fz_pixmap* HGPdfReaderImpl::fz_new_pixmap_from_page_number(fz_context* ctx, fz_document* doc, int number, fz_matrix ctm, fz_colorspace* cs, int alpha)
{
	typedef fz_pixmap* (*Func)(fz_context*, fz_document*, int, fz_matrix, fz_colorspace*, int);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_new_pixmap_from_page_number", (HGPointer*)&func);
	if (NULL == func)
	{
		return NULL;
	}

	return func(ctx, doc, number, ctm, cs, alpha);
}

fz_colorspace* HGPdfReaderImpl::fz_device_rgb(fz_context* ctx)
{
	typedef fz_colorspace* (*Func)(fz_context*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_device_rgb", (HGPointer*)&func);
	if (NULL == func)
	{
		return NULL;
	}

	return func(ctx);
}

int HGPdfReaderImpl::fz_pixmap_width(fz_context* ctx, const fz_pixmap* pix)
{
	typedef int (*Func)(fz_context*, const fz_pixmap*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_pixmap_width", (HGPointer*)&func);
	if (NULL == func)
	{
		return -1;
	}

	return func(ctx, pix);
}

int HGPdfReaderImpl::fz_pixmap_height(fz_context* ctx, const fz_pixmap* pix)
{
	typedef int (*Func)(fz_context*, const fz_pixmap*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_pixmap_height", (HGPointer*)&func);
	if (NULL == func)
	{
		return -1;
	}

	return func(ctx, pix);
}

void HGPdfReaderImpl::fz_drop_pixmap(fz_context* ctx, fz_pixmap* pix)
{
	typedef void (*Func)(fz_context*, fz_pixmap*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_drop_pixmap", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(ctx, pix);
}

fz_jmp_buf* HGPdfReaderImpl::fz_push_try(fz_context* ctx)
{
	typedef fz_jmp_buf* (*Func)(fz_context*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_push_try", (HGPointer*)&func);
	if (NULL == func)
	{
		return NULL;
	}

	return func(ctx);
}

int HGPdfReaderImpl::fz_do_try(fz_context* ctx)
{
	typedef int (*Func)(fz_context*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_do_try", (HGPointer*)&func);
	if (NULL == func)
	{
		return -1;
	}

	return func(ctx);
}

int HGPdfReaderImpl::fz_do_catch(fz_context* ctx)
{
	typedef int (*Func)(fz_context*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "fz_do_catch", (HGPointer*)&func);
	if (NULL == func)
	{
		return -1;
	}

	return func(ctx);
}


#if defined(HG_CMP_MSC)
static WCHAR* GetUnicodeStr(const char* text)
{
	int len = ::MultiByteToWideChar(CP_ACP, 0, text, -1, NULL, 0);
	WCHAR* pUnicode = new WCHAR[len];
	::MultiByteToWideChar(CP_ACP, 0, text, -1, pUnicode, len);
	return pUnicode;
}
static uint32_t GetUnicodeStrLen(const WCHAR* pUnicode)
{
	return (uint32_t)wcslen(pUnicode);
}
#else
static uint16_t* GetUnicodeStr(const char* text)
{
	if (0 == *text)
	{
		uint16_t* pUnicode = new uint16_t[1];
		*pUnicode = 0;
		return pUnicode;
	}

	uint16_t* pUnicode = new uint16_t[strlen(text) + 2];
	memset(pUnicode, 0, sizeof(uint16_t) * (strlen(text) + 2));

	iconv_t cd = iconv_open("UNICODE//IGNORE", "UTF-8");
	if ((iconv_t)-1 != cd)
	{
		char* inbuf = (char*)text;
		size_t inbytes = strlen(text);
		char* outbuf = (char*)pUnicode;
		size_t outsize = sizeof(uint16_t) * (strlen(text) + 1);

		iconv(cd, &inbuf, &inbytes, &outbuf, &outsize);
		iconv_close(cd);
	}

	return pUnicode;
}
static uint32_t GetUnicodeStrLen(const uint16_t* pUnicode)
{
	uint32_t i = 0;
	while (0 != pUnicode[i])
	{
		++i;
	}

	return i;
}
#endif

HGPdfImageWriterImpl::HGPdfImageWriterImpl()
{
	m_dll = NULL;
	m_pPdf = NULL;
}

HGPdfImageWriterImpl::~HGPdfImageWriterImpl()
{

}

HGResult HGPdfImageWriterImpl::Open(const HGChar* fileName)
{
	if (NULL != m_pPdf)
	{
		return HGBASE_ERR_FAIL;
	}

	if (NULL == fileName)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	assert(NULL == m_dll);

	HGChar moduleName[256];
	HGBase_GetModuleName((void*)HGImgFmt_OpenPdfImageWriter, moduleName, 256);
	HGChar dllPath[256];
	HGBase_GetFilePath(moduleName, dllPath, 256);

#if defined(HG_CMP_MSC)
	strcat(dllPath, "pdflib.dll");
#else
	strcat(dllPath, "libpdf.so");
#endif
	HGResult ret = HGBase_CreateDll(dllPath, &m_dll);
	if (HGBASE_ERR_OK != ret)
	{
		HGBase_WriteInfo(HGBASE_INFOTYPE_DESC, "Load PDF Library Failed, path=%s", dllPath);
		return ret;
	}

	PDF* p = PDF_new();
	if (NULL == p)
	{
		HGBase_DestroyDll(m_dll);
		m_dll = NULL;
		return HGBASE_ERR_OUTOFMEMORY;
	}

#if defined(HG_CMP_MSC)
	WCHAR* pUnicode = GetUnicodeStr(fileName);
#else
	uint16_t* pUnicode = GetUnicodeStr(fileName);
#endif

	PDF_TRY(p)
	{
		PDF_set_parameter(p, "compatibility", "1.4");
		PDF_set_parameter(p, "errorpolicy", "return");
		PDF_set_parameter(p, "hypertextencoding", "host");

#if defined(HG_CMP_MSC)
		if (-1 == PDF_begin_document(p, (const char*)pUnicode, (int)(GetUnicodeStrLen(pUnicode) * sizeof(WCHAR)), ""))
#else
		if (-1 == PDF_begin_document(p, (const char*)pUnicode, (int)(GetUnicodeStrLen(pUnicode) * sizeof(uint16_t)), ""))
#endif
		{
			delete[] pUnicode;
			PDF_delete(p);
			HGBase_DestroyDll(m_dll);
			m_dll = NULL;
			return HGBASE_ERR_FAIL;
		}
	}
	PDF_CATCH(p)
	{
		delete[] pUnicode;
		PDF_delete(p);
		HGBase_DestroyDll(m_dll);
		m_dll = NULL;
		return HGBASE_ERR_FAIL;
	}

	delete[] pUnicode;
	m_pPdf = p;
	return HGBASE_ERR_OK;
}

HGResult HGPdfImageWriterImpl::Close()
{
	if (NULL == m_pPdf)
	{
		return HGBASE_ERR_FAIL;
	}

	PDF_TRY(m_pPdf)
	{
		PDF_end_document(m_pPdf, "");
	}
	PDF_CATCH(m_pPdf)
	{

	}

	PDF_delete(m_pPdf);
	m_pPdf = NULL;
	HGBase_DestroyDll(m_dll);
	m_dll = NULL;
	return HGBASE_ERR_OK;
}

HGResult HGPdfImageWriterImpl::SaveJpegImage(HGImage image, const HGJpegSaveInfo* info)
{
	if (NULL == m_pPdf)
	{
		return HGBASE_ERR_FAIL;
	}

	if (NULL == image)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGBuffer buffer = NULL;
	HGResult ret = HGImgFmt_SaveJpegImageToBuffer(image, info, &buffer);
	if (HGBASE_ERR_OK != ret)
	{
		return ret;
	}

	HGByte* imgBuf = NULL;
	HGBase_GetBufferData(buffer, &imgBuf);
	HGUSize size = 0;
	HGBase_GetBufferSize(buffer, &size);

	PDF_TRY(m_pPdf)
	{
		PDF_create_pvf(m_pPdf, "virtual_file", 0, imgBuf, size, "");
	}
	PDF_CATCH(m_pPdf)
	{
		HGBase_DestroyBuffer(buffer);
		return HGBASE_ERR_OUTOFMEMORY;
	}

	int img = PDF_load_image(m_pPdf, "auto", "virtual_file", 0, "page 1");
	if (-1 != img)
	{
		PDF_begin_page_ext(m_pPdf, 0.0, 0.0, "");
		PDF_fit_image(m_pPdf, img, 0.0, 0.0, "adjustpage");
		PDF_end_page_ext(m_pPdf, "");
		PDF_close_image(m_pPdf, img);
	}

	PDF_delete_pvf(m_pPdf, "virtual_file", 0);

	HGBase_DestroyBuffer(buffer);
	return HGBASE_ERR_OK;
}

PDF* HGPdfImageWriterImpl::PDF_new(void)
{
	typedef PDF* (PDFLIB_CALL *Func)();
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_new", (HGPointer*)&func);
	if (NULL == func)
	{
		return NULL;
	}

	return func();
}

void HGPdfImageWriterImpl::PDF_set_parameter(PDF* p, const char* key, const char* value)
{
	typedef void (PDFLIB_CALL* Func)(PDF*, const char*, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_set_parameter", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(p, key, value);
}

int HGPdfImageWriterImpl::PDF_begin_document(PDF* p, const char* filename, int len, const char* optlist)
{
	typedef int (PDFLIB_CALL* Func)(PDF*, const char*, int, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_begin_document", (HGPointer*)&func);
	if (NULL == func)
	{
		return -1;
	}

	return func(p, filename, len, optlist);
}

void HGPdfImageWriterImpl::PDF_delete(PDF* p)
{
	typedef void (PDFLIB_CALL* Func)(PDF*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_delete", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(p);
}

void HGPdfImageWriterImpl::PDF_end_document(PDF* p, const char* optlist)
{
	typedef void (PDFLIB_CALL* Func)(PDF*, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_end_document", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(p, optlist);
}

void HGPdfImageWriterImpl::PDF_create_pvf(PDF* p, const char* filename, int len, const void* data, size_t size, const char* optlist)
{
	typedef void (PDFLIB_CALL* Func)(PDF*, const char*, int, const void*, size_t, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_create_pvf", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(p, filename, len, data, size, optlist);
}

int HGPdfImageWriterImpl::PDF_load_image(PDF* p, const char* imagetype, const char* filename, int len, const char* optlist)
{
	typedef int (PDFLIB_CALL* Func)(PDF*, const char*, const char*, int, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_load_image", (HGPointer*)&func);
	if (NULL == func)
	{
		return -1;
	}

	return func(p, imagetype, filename, len, optlist);
}

void HGPdfImageWriterImpl::PDF_begin_page_ext(PDF* p, double width, double height, const char* optlist)
{
	typedef void (PDFLIB_CALL* Func)(PDF*, double, double, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_begin_page_ext", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(p, width, height, optlist);
}

void HGPdfImageWriterImpl::PDF_fit_image(PDF* p, int image, double x, double y, const char* optlist)
{
	typedef void (PDFLIB_CALL* Func)(PDF*, int, double, double, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_fit_image", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(p, image, x, y, optlist);
}

void HGPdfImageWriterImpl::PDF_end_page_ext(PDF* p, const char* optlist)
{
	typedef void (PDFLIB_CALL* Func)(PDF*, const char*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_end_page_ext", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(p, optlist);
}

void HGPdfImageWriterImpl::PDF_close_image(PDF* p, int image)
{
	typedef void (PDFLIB_CALL* Func)(PDF*, int);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_close_image", (HGPointer*)&func);
	if (NULL == func)
	{
		return;
	}

	func(p, image);
}

int HGPdfImageWriterImpl::PDF_delete_pvf(PDF* p, const char* filename, int len)
{
	typedef int (PDFLIB_CALL* Func)(PDF*, const char*, int);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "PDF_delete_pvf", (HGPointer*)&func);
	if (NULL == func)
	{
		return -1;
	}

	return func(p, filename, len);
}

pdf_jmpbuf* HGPdfImageWriterImpl::pdf_jbuf(PDF* p)
{
	typedef pdf_jmpbuf* (PDFLIB_CALL* Func)(PDF*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "pdf_jbuf", (HGPointer*)&func);
	if (NULL == func)
	{
		return NULL;
	}

	return func(p);
}

int HGPdfImageWriterImpl::pdf_catch(PDF* p)
{
	typedef int (PDFLIB_CALL* Func)(PDF*);
	Func func = NULL;
	HGBase_GetDllProcAddress(m_dll, "pdf_catch", (HGPointer*)&func);
	if (NULL == func)
	{
		return -1;
	}

	return func(p);
}