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Copy pathhpdf_doc_png.c
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137 lines (104 loc) · 3.38 KB
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/*
* << Haru Free PDF Library 2.0.3 >> -- hpdf_doc_png.c
*
* Copyright (c) 1999-2006 Takeshi Kanno <takeshi_kanno@est.hi-ho.ne.jp>
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation.
* It is provided "as is" without express or implied warranty.
*
*/
#include "hpdf_conf.h"
#include "hpdf_utils.h"
#include "hpdf.h"
#include "hpdf_image.h"
static HPDF_Image
LoadPngImageFromStream (HPDF_Doc pdf,
HPDF_Stream imagedata,
HPDF_BOOL delayed_loading);
HPDF_EXPORT(HPDF_Image)
HPDF_LoadPngImageFromFile (HPDF_Doc pdf,
const char *filename)
{
HPDF_Stream imagedata;
HPDF_Image image;
HPDF_PTRACE ((" HPDF_LoadPngImageFromFile\n"));
if (!HPDF_HasDoc (pdf))
return NULL;
/* create file stream */
imagedata = HPDF_FileReader_New (pdf->mmgr, filename);
if (HPDF_Stream_Validate (imagedata))
image = LoadPngImageFromStream (pdf, imagedata, HPDF_FALSE);
else
image = NULL;
/* destroy file stream */
if (imagedata)
HPDF_Stream_Free (imagedata);
if (!image)
HPDF_CheckError (&pdf->error);
return image;
}
/* delaied loading version of HPDF_LoadPngImageFromFile */
HPDF_EXPORT(HPDF_Image)
HPDF_LoadPngImageFromFile2 (HPDF_Doc pdf,
const char *filename)
{
HPDF_Stream imagedata;
HPDF_Image image;
HPDF_String fname;
HPDF_PTRACE ((" HPDF_LoadPngImageFromFile\n"));
if (!HPDF_HasDoc (pdf))
return NULL;
/* check whether file name is valid or not. */
imagedata = HPDF_FileReader_New (pdf->mmgr, filename);
if (HPDF_Stream_Validate (imagedata))
image = LoadPngImageFromStream (pdf, imagedata, HPDF_TRUE);
else
image = NULL;
/* destroy file stream */
if (imagedata)
HPDF_Stream_Free (imagedata);
if (!image)
HPDF_CheckError (&pdf->error);
/* add file-name to image dictionary as a hidden entry.
* it is used when the image data is needed.
*/
fname = HPDF_String_New (pdf->mmgr, filename, NULL);
if (!fname) {
HPDF_CheckError (&pdf->error);
return NULL;
}
fname->header.obj_id |= HPDF_OTYPE_HIDDEN;
if ((HPDF_Dict_Add (image, "_FILE_NAME", fname)) != HPDF_OK) {
HPDF_CheckError (&pdf->error);
return NULL;
}
return image;
}
#ifndef HPDF_NOPNGLIB
static HPDF_Image
LoadPngImageFromStream (HPDF_Doc pdf,
HPDF_Stream imagedata,
HPDF_BOOL delayed_loading)
{
HPDF_Image image;
HPDF_PTRACE ((" HPDF_LoadPngImageFromStream\n"));
image = HPDF_Image_LoadPngImage (pdf->mmgr, imagedata, pdf->xref,
delayed_loading);
if (image && (pdf->compression_mode & HPDF_COMP_IMAGE))
image->filter = HPDF_STREAM_FILTER_FLATE_DECODE;
return image;
}
#else
static HPDF_Image
LoadPngImageFromStream (HPDF_Doc pdf,
HPDF_Stream imagedata,
HPDF_BOOL delayed_loading)
{
HPDF_SetError (&pdf->error, HPDF_UNSUPPORTED_FUNC, 0);
return NULL;
}
#endif /* HPDF_NOPNGLIB */