本文整理汇总了C++中png_check_sig函数的典型用法代码示例。如果您正苦于以下问题：C++ png_check_sig函数的具体用法？C++ png_check_sig怎么用？C++ png_check_sig使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了png_check_sig函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。
示例1: setup_png_reader
/**
* Initialize png reader struct.
*/
void setup_png_reader(const char* data, size_t length, png_structp* outpng_ptr, png_infop* out_info_ptr) {
if (length <= PNG_HEADER_SIZE || !png_check_sig((png_bytep)data, PNG_HEADER_SIZE)) {
logstream(LOG_ERROR) << "Invalid PNG signature" << std::endl;
throw(std::string("Invalid PNG file"));
}
// Begin setup
// main png read struct
png_structp png_ptr = NULL;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, png_error_handler, NULL);
if(png_ptr == NULL) {
logstream(LOG_ERROR) << "Fail allocating PNG reader struct" << std::endl;
throw(std::string("Unexpected libpng error"));
}
// png info struct
png_infop info_ptr = NULL;
info_ptr = png_create_info_struct(png_ptr);
if(info_ptr == NULL) {
// libpng must free file info struct memory before we bail
png_destroy_read_struct(&png_ptr, NULL, NULL);
logstream(LOG_ERROR) << "Fail allocating PNG info struct" << std::endl;
throw(std::string("Unexpected libpng error"));
}
*outpng_ptr = png_ptr;
*out_info_ptr = info_ptr;
}
开发者ID:DreamStudio2015，项目名称:SFrame，代码行数:31，代码来源:png_io.cpp
示例2: ifile
bool PngLoader::load( std::string file )
{
png_structp png_ptr;
png_infop info_ptr;
std::ifstream ifile( file.c_str(), std::ios::binary );
if( !ifile.is_open() )
return false;
char assinatura[8];
ifile.read( &assinatura[0], 8 * sizeof(char) );
if(!png_check_sig( (png_bytep)assinatura, 8) )
{
return false;
}
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if(png_ptr == 0)
{
return false;
}
info_ptr = png_create_info_struct( png_ptr );
if( info_ptr == 0 )
{
png_destroy_read_struct( &png_ptr, 0, 0 );
return false;
}
png_set_read_fn( png_ptr, (void*)&ifile, readFileCallback );
png_set_sig_bytes( png_ptr, 8 );
png_read_info( png_ptr, info_ptr );
png_get_IHDR( png_ptr, info_ptr, (png_uint_32*)&width, (png_uint_32*)&height,
&depth, &color_type, 0, 0, 0 );
cols = png_get_rowbytes(png_ptr, info_ptr);
png_bytepp row_pp = new png_bytep[height];
data = new char[ cols * height ];
for( int i = 0; i < height; ++i )
{
row_pp[height - i - 1] = (png_bytep)&data[ i * cols ];
}
png_read_image( png_ptr, row_pp );
png_read_end( png_ptr, info_ptr );
png_destroy_read_struct( &png_ptr, &info_ptr, 0 );
delete[] row_pp;
return true;
}
开发者ID:thebracket，项目名称:bgame，代码行数:60，代码来源:PngLoader.cpp
示例3: readpng_init
uint32 readpng_init(FILE *infile)
{
uint8 sig[8];
/* first do a quick check that the file really is a PNG image; could
* have used slightly more general png_sig_cmp() function instead */
fread(sig, 1, 8, infile);
if (!png_check_sig(sig, 8))
return 1; /* bad signature */
/* could pass pointers to user-defined error handlers instead of NULLs: */
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
return 4; /* out of memory */
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
return 4; /* out of memory */
}
png_init_io(png_ptr, infile);
png_set_sig_bytes(png_ptr, 8); /* we already read the 8 signature bytes */
png_read_info(png_ptr, info_ptr); /* read all PNG info up to image data */
/* OK, that's all we need for now; return happy */
return 0;
}
开发者ID:andressbarajas，项目名称:DCMappy，代码行数:32，代码来源:readpng.c
示例4: get_raw_image_data_from_png
RawImageData get_raw_image_data_from_png(const void* png_data, const int png_data_size)
{
assert(png_data != NULL && png_data_size > 8);
assert(png_check_sig((void*)png_data, 8));
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
assert(png_ptr != NULL);
png_infop info_ptr = png_create_info_struct(png_ptr);
assert(info_ptr != NULL);
ReadDataHandle png_data_handle = (ReadDataHandle) {{png_data, png_data_size}, 0};
png_set_read_fn(png_ptr, &png_data_handle, read_png_data_callback);
if (setjmp(png_jmpbuf(png_ptr)))
{
CRASH("Error reading PNG file!");
}
const PngInfo png_info = read_and_update_info(png_ptr, info_ptr);
const DataHandle raw_image = read_entire_png_image(png_ptr, info_ptr, png_info.height);
png_read_end(png_ptr, info_ptr);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return (RawImageData)
{
png_info.width,
png_info.height,
raw_image.size,
get_gl_color_format(png_info.color_type),
raw_image.data
};
}
开发者ID:googler2013，项目名称:tappy-plane，代码行数:33，代码来源:image.c
示例5: isALoadableFileFormat
//! returns true if the file maybe is able to be loaded by this class
bool CImageLoaderPng::isALoadableFileFormat(engine::io::IReadFile* file)
{
#ifdef _engine_COMPILE_WITH_LIBPNG_
if (!file)
return false;
// Read the first few bytes of the PNG file
if (file->read(&g_png_load_buffer, 8) != 8)
{
//os::Printer::log("Not a PNG file: can't read file\n", file->getFileName(), ELL_ERROR);
return false;
}
// CHeck if it really is a PNG file
if (!png_check_sig((png_bytep)g_png_load_buffer, 8))
{
//os::Printer::log("Not a PNG file: wrong header\n", file->getFileName(),ELL_ERROR);
return false;
}
return true; //if we are here then it must be a png
#else
return false;
#endif // _engine_COMPILE_WITH_LIBPNG_
}
开发者ID:jduranmaster，项目名称:ltegameengine，代码行数:28，代码来源:CImageLoaderPNG.cpp
示例6: fopen
int FilePNG::check_sig(Asset *asset)
{
FILE *stream = fopen(asset->path, "rb");
if(stream)
{
//printf("FilePNG::check_sig 1\n");
char test[16];
fread(test, 16, 1, stream);
fclose(stream);
if(png_check_sig((unsigned char*)test, 8))
{
//printf("FilePNG::check_sig 1\n");
return 1;
}
else
if(test[0] == 'P' && test[1] == 'N' && test[2] == 'G' &&
test[3] == 'L' && test[4] == 'I' && test[5] == 'S' && test[6] == 'T')
{
//printf("FilePNG::check_sig 1\n");
return 1;
}
}
return 0;
}
开发者ID:rasilon，项目名称:cinelerra-cv，代码行数:27，代码来源:filepng.C
示例7: readpng_init
int readpng_init(FILE *infile, long *pWidth, long *pHeight)
{
uch sig[8];
/* first do a quick check that the file really is a PNG image; could
* have used slightly more general png_sig_cmp() function instead */
fread(sig, 1, 8, infile);
if (!png_check_sig(sig, 8))
return 1; /* bad signature */
/* could pass pointers to user-defined error handlers instead of NULLs: */
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
return 4; /* out of memory */
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
return 4; /* out of memory */
}
/* we could create a second info struct here (end_info), but it's only
* useful if we want to keep pre- and post-IDAT chunk info separated
* (mainly for PNG-aware image editors and converters) */
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function */
if (setjmp(png_ptr->jmpbuf)) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 2;
}
png_init_io(png_ptr, infile);
png_set_sig_bytes(png_ptr, 8); /* we already read the 8 signature bytes */
png_read_info(png_ptr, info_ptr); /* read all PNG info up to image data */
/* alternatively, could make separate calls to png_get_image_width(),
* etc., but want bit_depth and color_type for later [don't care about
* compression_type and filter_type => NULLs] */
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
NULL, NULL, NULL);
*pWidth = width;
*pHeight = height;
/* OK, that's all we need for now; return happy */
return 0;
}
开发者ID:sharkcz，项目名称:xtrkcad，代码行数:60，代码来源:readpng.c
示例8: GetImageInfo
virtual bool GetImageInfo(dword header, int limit_size_x, int limit_size_y, C_fixed limit_ratio){
if(!png_check_sig((byte*)&header, 4))
return false;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, this, PNG_Error, PNG_Error);
if(!png_ptr)
return false;
//E_LOADER_RESULT ret = IMGLOAD_READ_ERROR;
info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr)
return false;
png_set_bgr(png_ptr);
png_set_expand(png_ptr);
png_set_palette_to_rgb(png_ptr);
png_set_strip_16(png_ptr);
png_set_gray_to_rgb(png_ptr);
png_set_read_fn(png_ptr, (void*)fl, &ReadFromCache);
if(!png_read_info(png_ptr, info_ptr))
return false;
bpp = (info_ptr->pixel_depth+7) / 8;
if(info_ptr->pixel_depth>32)
bpp /= 2;
//if(info_ptr->num_palette && info_ptr->bit_depth==8)
// pf->bytes_per_pixel = 1;
//if 8-bit grayscale, consider it as RGB
size_original_x = size_x = info_ptr->width;
size_original_y = size_y = info_ptr->height;
return true;
}
开发者ID:turbanoff，项目名称:X-plore，代码行数:33，代码来源:ImgLoadPNG.cpp
示例9: Probe
static DFBResult
Probe( IDirectFBImageProvider_ProbeContext *ctx )
{
if (png_check_sig( ctx->header, 8 ))
return DFB_OK;
return DFB_UNSUPPORTED;
}
开发者ID:maxupunk，项目名称:DIR685，代码行数:8，代码来源:idirectfbimageprovider_png.c
示例10: check_for_png
int check_for_png (FILE *png_file)
{
rewind (png_file);
if (fread (sigbytes, 1, sizeof(sigbytes), png_file) !=
sizeof(sigbytes) ||
(!png_check_sig (sigbytes, sizeof(sigbytes))))
return 0;
else
return 1;
}
开发者ID:BackupTheBerlios，项目名称:texlive，代码行数:10，代码来源:pngimage.c
示例11: png_image_get_IHDR
bool png_image_get_IHDR(const char *fn, uint32_t *width, uint32_t *height, uint8_t *bpp)
{
stack_chain_iterate_t sci = { 0 };
BYTE *file_buffer = nullptr;
file_buffer_t file = { 0 };
json_t *chain = resolve_chain_game(fn);
if (json_array_size(chain)) {
log_printf("(PNG) Resolving %s...", json_array_get_string(chain, 0));
while (file_buffer == nullptr && stack_chain_iterate(&sci, chain, SCI_BACKWARDS, nullptr) != 0) {
file_buffer = (BYTE*)patch_file_load(sci.patch_info, sci.fn, &file.size);
}
}
if (!file_buffer) {
log_print("not found\n");
json_decref(chain);
return false;
}
patch_print_fn(sci.patch_info, sci.fn);
log_print("\n");
json_decref(chain);
file.buffer = file_buffer;
if (!png_check_sig(file.buffer, 8)) {
log_print("Bad PNG signature!\n");
free(file_buffer);
return false;
}
file.buffer += 8;
file.size -= 8;
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, png_error_callback, png_warning_callback);
png_infop info_ptr = png_create_info_struct(png_ptr);
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(file_buffer);
return false;
}
png_set_read_fn(png_ptr, &file, read_bytes);
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
int color_type;
png_get_IHDR(png_ptr, info_ptr, width, height, NULL, &color_type, NULL, NULL, NULL);
if (bpp) {
*bpp = (color_type & PNG_COLOR_MASK_ALPHA) ? 32 : 24;
}
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(file_buffer);
return true;
}
开发者ID:thpatch，项目名称:thcrap，代码行数:53，代码来源:png.cpp
示例12: ImageFormatReaderHelper
//
// Constructor
//
PNGReader::PNGReader(const QString & ext, MemoryFile & file)
: ImageFormatReaderHelper(file)
{
if (file.size() < 8)
return;
byte buf[8];
if (!tryReadFile(buf, sizeof(buf)))
return;
if (png_check_sig((png_bytep)buf, sizeof(buf)))
m_IsValid = true;
}
开发者ID:ashuron，项目名称:superplex3d_prototype，代码行数:16，代码来源:png_reader.cpp
示例13: validate
bool validate(SprigFile *pngFile) {
//Allocate a buffer of 8 bytes, where we can put the file signature.
png_byte header[8];
fread(&header, 8, sizeof(png_byte), pngFile->file);
rewind(pngFile->file);//rewind to prepare for reading the file
if(!png_check_sig(header, 8))
{
return false;
}
return true;
}
开发者ID:meroon，项目名称:Sprig，代码行数:15，代码来源:SprigImageEncoding.cpp
示例14: opendata
virtual bool opendata(const unsigned char *data, size_t size)
{
if (m_png_ptr)
return false;
if (size < 8)
return false;
if (png_check_sig(data, 8)){
m_png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
m_info_ptr = png_create_info_struct(m_png_ptr);
m_data_ptr = new PNGData;
m_data_ptr->pdata = (const unsigned char *)data;
m_data_ptr->size = size;
png_set_read_fn(m_png_ptr, m_data_ptr, data_from_memory);
png_read_info(m_png_ptr, m_info_ptr);
return true;
}
return false;
}
开发者ID:maoenpei，项目名称:project_of_utils，代码行数:18，代码来源:LibPNG.cpp
示例15: check_png
/* check to see if a file is a png file using png_check_sig() */
int check_png(char * file_name)
{
FILE *fp;
char buf[8];
int ret;
fp = fopen(file_name, "rb");
if (!fp)
return 0;
ret = fread(buf, 1, 8, fp);
fclose(fp);
if (ret != 8)
return 0;
ret = png_check_sig(buf, 8);
return (ret);
}
开发者ID:deepmatrix，项目名称:blaxxun-cc3d，代码行数:20，代码来源:example.c
示例16: read_image
static int read_image(const char *filename, png24_image *image)
{
int retval=1;
bool using_stdin = false;
FILE *fh;
unsigned char buffer[8];
if (0 == strcmp("-", filename)) {
using_stdin = true;
fh = stdin;
} else {
fh = fopen(filename, "rb");
if (!fh) {
return 1;
}
}
setvbuf(fh, (char *)buffer, _IOFBF, 8);
// the first read fills the buffer up, but put char back on after
int c = fgetc(fh);
ungetc(c, fh);
// the png number is not really precise but I guess the situation where this would falsely pass is almost equal to 0
if (png_check_sig(buffer, 8))
{
/*
Reads image into png24_image struct. Returns non-zero on error
*/
retval = rwpng_read_image24(fh, image, 0);
}
#ifdef USE_LIBJPEG
else
{
retval=read_image_jpeg(fh,image);
}
#endif
if(!using_stdin) {
fclose(fh);
}
return retval;
}
开发者ID:pornel，项目名称:dssim，代码行数:42，代码来源:main.c
示例17: openfile
virtual bool openfile(const char *filename)
{
if (m_png_ptr)
return false;
FILE *f = fopen(filename, "rb");
if (f){
unsigned char head[8];
fread(head, 1, 8, f);
if (png_check_sig(head, 8)){
m_png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
m_info_ptr = png_create_info_struct(m_png_ptr);
png_init_io(m_png_ptr, f);
png_set_sig_bytes(m_png_ptr, 8);
png_read_info(m_png_ptr, m_info_ptr);
m_file_ptr = f;
return true;
}
fclose(f);
}
return false;
}
开发者ID:maoenpei，项目名称:project_of_utils，代码行数:21，代码来源:LibPNG.cpp
示例18: querypng
static gboolean querypng(FILE *f, int *w, int *h)
{
png_struct *png_ptr = NULL;
png_info *info_ptr = NULL;
png_byte buf[8];
png_uint_32 width;
png_uint_32 height;
int bit_depth;
int color_type;
/* is it a PNG file? */
if( fread( buf,1,8,f ) != 8 ) return FALSE;
if( ! png_check_sig( buf,8 ) ) return FALSE;
png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
if( !png_ptr ) return FALSE;
info_ptr = png_create_info_struct( png_ptr );
if( !info_ptr ){
png_destroy_read_struct( &png_ptr,NULL,NULL );
return FALSE;
}
if( setjmp( png_jmpbuf(png_ptr) ) ){
png_destroy_read_struct( &png_ptr,&info_ptr,NULL );
return FALSE;
}
png_init_io( png_ptr,f );
png_set_sig_bytes( png_ptr,8 );
png_read_info( png_ptr,info_ptr );
png_get_IHDR( png_ptr,info_ptr,&width,&height,&bit_depth,
&color_type,NULL,NULL,NULL);
*w = width;
*h = height;
png_destroy_read_struct( &png_ptr,&info_ptr,NULL );
return TRUE;
}
开发者ID:ev3dev，项目名称:grx，代码行数:40，代码来源:png2ctx.c
示例19: readpng_init
void * readpng_init(FILE *infile)
{
uint8 sig[8];
readpng_structs_t * strs = malloc(sizeof(readpng_structs_t));
memset(strs, 0, sizeof(readpng_structs_t));
/* first do a quick check that the file really is a PNG image; could
* have used slightly more general png_sig_cmp() function instead */
fread(sig, 1, 8, infile);
if (!png_check_sig(sig, 8)) {
free(strs);
return NULL; /* bad signature */
}
/* could pass pointers to user-defined error handlers instead of NULLs: */
strs->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!strs->png_ptr) {
free(strs);
return NULL; /* out of memory */
}
strs->info_ptr = png_create_info_struct(strs->png_ptr);
if (!strs->info_ptr) {
png_destroy_read_struct(&strs->png_ptr, NULL, NULL);
free(strs);
return NULL; /* out of memory */
}
png_init_io(strs->png_ptr, infile);
png_set_sig_bytes(strs->png_ptr, 8); /* we already read the 8 signature bytes */
png_read_info(strs->png_ptr, strs->info_ptr); /* read all PNG info up to image data */
/* OK, that's all we need for now; return happy */
return (void *)strs;
}
开发者ID:foreverlikeyou9999，项目名称:kos-ports，代码行数:39，代码来源:readpng.c
示例20: loadimage
int loadimage(char *filename)
{
infile = fopen(filename, "rb");
unsigned char sig[8];
fread(sig, 1, 8, infile);
if (!png_check_sig(sig, 8))
return 1; /* bad signature */
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL,
NULL);
if (!png_ptr)
return 4; /* out of memory */
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
return 4; /* out of memory */
}
if (setjmp(png_ptr->jmpbuf)) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 2;
}
png_init_io(png_ptr, infile);
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
//png_get_IHDR(png_ptr, info_ptr, &pwidth, &pheight, &bit_depth,
// &color_type, NULL, NULL, NULL);
//*width = pwidth;
//*height = pheight;
return 0;
}
开发者ID:hmc-cs-jsealand，项目名称:line_drawing，代码行数:39，代码来源:load-image.c
注：本文中的png_check_sig函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。 |
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