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Copy pathhpdf_image_png.c
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424 lines (322 loc) · 11.3 KB
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/*
* << Haru Free PDF Library 2.0.3 >> -- hpdf_image.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_image.h"
#ifndef HPDF_NOPNGLIB
#include <png.h>
static void
PngErrorFunc (png_structp png_ptr,
const char *msg);
static void
PngReadFunc (png_structp png_ptr,
png_bytep data,
png_uint_32 length)
{
HPDF_UINT len = length;
HPDF_Stream stream = (HPDF_Stream)png_get_io_ptr (png_ptr);
HPDF_Stream_Read (stream, data, &len);
}
static HPDF_STATUS
LoadPngData (HPDF_Dict image,
HPDF_Stream png_data,
HPDF_BOOL delayed_loading);
static void
PngErrorFunc (png_structp png_ptr,
const char *msg);
static HPDF_STATUS
ReadPngData_Interlaced (HPDF_Dict image,
png_structp png_ptr,
png_infop info_ptr);
static HPDF_STATUS
ReadPngData (HPDF_Dict image,
png_structp png_ptr,
png_infop info_ptr);
static HPDF_STATUS
CreatePallet (HPDF_Dict image,
png_structp png_ptr,
png_infop info_ptr);
static HPDF_STATUS
PngBeforeWrite (HPDF_Dict obj);
static HPDF_STATUS
PngAfterWrite (HPDF_Dict obj);
/*---------------------------------------------------------------------------*/
static void
PngErrorFunc (png_structp png_ptr,
const char *msg)
{
char error_number[16];
HPDF_UINT i;
HPDF_STATUS detail_no;
HPDF_Error error;
/* pick out error-number from error message */
HPDF_MemSet (error_number, 0, 16);
for (i = 0; i < 15; i++) {
error_number[i] = *(msg + i);
if (*(msg + i + 1) == ' ')
break;
}
error = (HPDF_Error)png_get_error_ptr (png_ptr);
detail_no = (HPDF_STATUS)HPDF_AToI (error_number);
HPDF_SetError (error, HPDF_LIBPNG_ERROR, detail_no);
}
static HPDF_STATUS
ReadPngData_Interlaced (HPDF_Dict image,
png_structp png_ptr,
png_infop info_ptr)
{
png_uint_32 len = png_get_rowbytes(png_ptr, info_ptr);
png_bytep* row_pointers = HPDF_GetMem (image->mmgr,
info_ptr->height * sizeof (png_bytep));
if (row_pointers) {
HPDF_UINT i;
HPDF_MemSet (row_pointers, 0, info_ptr->height * sizeof (png_bytep));
for (i = 0; i < (HPDF_UINT)info_ptr->height; i++) {
row_pointers[i] = HPDF_GetMem (image->mmgr, len);
if (image->error->error_no != HPDF_OK)
break;
}
if (image->error->error_no == HPDF_OK) {
/* } else { remove this line */
png_read_image(png_ptr, row_pointers);
/* if (image->error->error_no != HPDF_OK) { remove this line */
if (image->error->error_no == HPDF_OK) { /* add this line */
for (i = 0; i < (HPDF_UINT)info_ptr->height; i++) {
if (HPDF_Stream_Write (image->stream, row_pointers[i], len) !=
HPDF_OK)
break;
}
}
}
/* clean up */
for (i = 0; i < (HPDF_UINT)info_ptr->height; i++) {
HPDF_FreeMem (image->mmgr, row_pointers[i]);
/* i-- remove this line */
}
HPDF_FreeMem (image->mmgr, row_pointers);
}
return image->error->error_no;
}
static HPDF_STATUS
ReadPngData (HPDF_Dict image,
png_structp png_ptr,
png_infop info_ptr)
{
png_uint_32 len = png_get_rowbytes(png_ptr, info_ptr);
png_bytep buf_ptr = HPDF_GetMem (image->mmgr, len);
if (buf_ptr) {
HPDF_UINT i;
for (i = 0; i < (HPDF_UINT)info_ptr->height; i++) {
png_read_rows(png_ptr, (png_byte**)&buf_ptr, NULL, 1);
if (image->error->error_no != HPDF_OK)
break;
if (HPDF_Stream_Write (image->stream, buf_ptr, len) != HPDF_OK)
break;
}
HPDF_FreeMem (image->mmgr, buf_ptr);
}
return image->error->error_no;
}
static HPDF_STATUS
CreatePallet (HPDF_Dict image,
png_structp png_ptr,
png_infop info_ptr)
{
HPDF_INT num_pl = 0;
png_color *src_pl = NULL;
HPDF_BYTE *ppallet;
HPDF_BYTE *p;
HPDF_UINT i;
HPDF_Array array;
/* png_get_PLTE does not call PngErrorFunc even if it failed.
* so we call HPDF_Set_Error to set error-code.
*/
if (png_get_PLTE(png_ptr, info_ptr, (png_color**)&src_pl, &num_pl) !=
PNG_INFO_PLTE)
return HPDF_SetError (image->error, HPDF_LIBPNG_ERROR,
HPDF_CANNOT_GET_PALLET);
/* make a pallet array for indexed image. */
ppallet = HPDF_GetMem (image->mmgr, num_pl * 3);
if (!ppallet)
return image->error->error_no;
p = ppallet;
for (i = 0; i < num_pl; i++, src_pl++) {
*p++ = src_pl->red;
*p++ = src_pl->green;
*p++ = src_pl->blue;
}
array = HPDF_Array_New (image->mmgr);
if (array) {
HPDF_Binary b;
HPDF_Dict_Add (image, "ColorSpace", array);
HPDF_Array_AddName (array, "Indexed");
HPDF_Array_AddName (array, "DeviceRGB");
HPDF_Array_AddNumber (array, num_pl - 1);
b = HPDF_Binary_New (image->mmgr, ppallet, num_pl * 3);
if (b)
HPDF_Array_Add (array, b);
}
HPDF_FreeMem (image->mmgr, ppallet);
return image->error->error_no;
}
#define HPDF_PNG_BYTES_TO_CHECK 8
HPDF_Image
HPDF_Image_LoadPngImage (HPDF_MMgr mmgr,
HPDF_Stream png_data,
HPDF_Xref xref,
HPDF_BOOL delayed_loading)
{
HPDF_STATUS ret;
HPDF_Dict image;
png_byte header[HPDF_PNG_BYTES_TO_CHECK];
HPDF_UINT len = HPDF_PNG_BYTES_TO_CHECK;
HPDF_PTRACE ((" HPDF_Image_LoadPngImage\n"));
HPDF_MemSet (header, 0x00, HPDF_PNG_BYTES_TO_CHECK);
ret = HPDF_Stream_Read (png_data, header, &len);
if (ret != HPDF_OK ||
png_sig_cmp (header, (png_size_t)0, HPDF_PNG_BYTES_TO_CHECK)) {
HPDF_SetError (mmgr->error, HPDF_INVALID_PNG_IMAGE, 0);
return NULL;
}
image = HPDF_DictStream_New (mmgr, xref);
if (!image)
return NULL;
image->header.obj_class |= HPDF_OSUBCLASS_XOBJECT;
ret += HPDF_Dict_AddName (image, "Type", "XObject");
ret += HPDF_Dict_AddName (image, "Subtype", "Image");
if (ret != HPDF_OK)
return NULL;
if (LoadPngData (image, png_data, delayed_loading) != HPDF_OK)
return NULL;
return image;
}
static HPDF_STATUS
LoadPngData (HPDF_Dict image,
HPDF_Stream png_data,
HPDF_BOOL delayed_loading)
{
HPDF_STATUS ret;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
HPDF_PTRACE ((" HPDF_Image_LoadPngImage\n"));
/* create read_struct. */
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING,
image->error, PngErrorFunc, PngErrorFunc);
if (png_ptr == NULL) {
HPDF_SetError (image->error, HPDF_FAILD_TO_ALLOC_MEM, 0);
return HPDF_FAILD_TO_ALLOC_MEM;
}
/* create info-struct */
info_ptr = png_create_info_struct (png_ptr);
if (info_ptr == NULL) {
HPDF_SetError (image->error, HPDF_FAILD_TO_ALLOC_MEM, 0);
goto Exit;
}
png_set_sig_bytes (png_ptr, HPDF_PNG_BYTES_TO_CHECK);
png_set_read_fn (png_ptr, (void *)png_data, (png_rw_ptr)&PngReadFunc);
/* reading info structure. */
png_read_info(png_ptr, info_ptr);
if (image->error->error_no != HPDF_OK)
goto Exit;
/* 16bit image and alpha color type are not supported. */
if (info_ptr->bit_depth == 16)
png_set_strip_16(png_ptr);
if (PNG_COLOR_MASK_ALPHA & info_ptr->color_type) {
/* png image with alpha chanel is not supported. */
png_set_strip_alpha(png_ptr);
}
png_read_update_info(png_ptr, info_ptr);
if (image->error->error_no != HPDF_OK)
goto Exit;
/* if the image has color palette, copy the pallet of the image to
* create color map.
*/
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
ret = CreatePallet(image, png_ptr, info_ptr);
else if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY)
ret = HPDF_Dict_AddName (image, "ColorSpace", "DeviceGray");
else
ret = HPDF_Dict_AddName (image, "ColorSpace", "DeviceRGB");
if (ret != HPDF_OK)
goto Exit;
/* read image-data
* if the image is interlaced, read whole image at once.
* if delayed_loading is HPDF_TRUE, the data does not load this phase.
*/
if (delayed_loading) {
image->before_write_fn = PngBeforeWrite;
image->after_write_fn = PngAfterWrite;
} else {
if (png_get_interlace_type(png_ptr, info_ptr) != PNG_INTERLACE_NONE)
ret = ReadPngData_Interlaced(image, png_ptr, info_ptr);
else
ret = ReadPngData(image, png_ptr, info_ptr);
if (ret != HPDF_OK)
goto Exit;
}
/* setting the info of the image. */
if (HPDF_Dict_AddNumber (image, "Width", (HPDF_UINT)info_ptr->width)
!= HPDF_OK)
goto Exit;
if (HPDF_Dict_AddNumber (image, "Height", (HPDF_UINT)info_ptr->height)
!= HPDF_OK)
goto Exit;
if (HPDF_Dict_AddNumber (image, "BitsPerComponent",
(HPDF_UINT)info_ptr->bit_depth) != HPDF_OK)
goto Exit;
/* clean up */
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return HPDF_OK;
Exit:
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return image->error->error_no;
}
static HPDF_STATUS
PngBeforeWrite (HPDF_Dict obj)
{
HPDF_STATUS ret;
png_byte header[HPDF_PNG_BYTES_TO_CHECK];
HPDF_UINT len = HPDF_PNG_BYTES_TO_CHECK;
HPDF_Stream png_data;
HPDF_String s;
HPDF_PTRACE ((" PngBeforeWrite\n"));
HPDF_MemStream_FreeData(obj->stream);
s = HPDF_Dict_GetItem (obj, "_FILE_NAME", HPDF_OCLASS_STRING);
if (!s)
return HPDF_SetError (obj->error, HPDF_MISSING_FILE_NAME_ENTRY, 0);
png_data = HPDF_FileReader_New (obj->mmgr, s->value);
if (!HPDF_Stream_Validate (png_data))
return obj->error->error_no;
HPDF_MemSet (header, 0x00, HPDF_PNG_BYTES_TO_CHECK);
ret = HPDF_Stream_Read (png_data, header, &len);
if (ret != HPDF_OK ||
png_sig_cmp (header, (png_size_t)0, HPDF_PNG_BYTES_TO_CHECK)) {
HPDF_Stream_Free(png_data);
return HPDF_SetError (obj->error, HPDF_INVALID_PNG_IMAGE, 0);
}
if ((ret = LoadPngData (obj, png_data, HPDF_FALSE)) != HPDF_OK) {
HPDF_Stream_Free(png_data);
return ret;
}
HPDF_Stream_Free(png_data);
return HPDF_OK;
}
static HPDF_STATUS
PngAfterWrite (HPDF_Dict obj)
{
HPDF_PTRACE ((" PngAfterWrite\n"));
HPDF_MemStream_FreeData(obj->stream);
return HPDF_OK;
}
#endif /* HPDF_NOPNGLIB */