1*ec63e07aSXin Li // Copyright 2020 Google LLC
2*ec63e07aSXin Li //
3*ec63e07aSXin Li // Licensed under the Apache License, Version 2.0 (the "License");
4*ec63e07aSXin Li // you may not use this file except in compliance with the License.
5*ec63e07aSXin Li // You may obtain a copy of the License at
6*ec63e07aSXin Li //
7*ec63e07aSXin Li // https://www.apache.org/licenses/LICENSE-2.0
8*ec63e07aSXin Li //
9*ec63e07aSXin Li // Unless required by applicable law or agreed to in writing, software
10*ec63e07aSXin Li // distributed under the License is distributed on an "AS IS" BASIS,
11*ec63e07aSXin Li // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12*ec63e07aSXin Li // See the License for the specific language governing permissions and
13*ec63e07aSXin Li // limitations under the License.
14*ec63e07aSXin Li
15*ec63e07aSXin Li #include <cstdlib>
16*ec63e07aSXin Li
png_setjmp(png_structrp ptr)17*ec63e07aSXin Li void png_setjmp(png_structrp ptr) { setjmp(png_jmpbuf(ptr)); }
18*ec63e07aSXin Li
png_fdopen(int fd,const char * mode)19*ec63e07aSXin Li void* png_fdopen(int fd, const char* mode) {
20*ec63e07aSXin Li FILE* f = fdopen(fd, mode);
21*ec63e07aSXin Li return static_cast<void*>(f);
22*ec63e07aSXin Li }
23*ec63e07aSXin Li
png_rewind(void * f)24*ec63e07aSXin Li void png_rewind(void* f) { rewind(static_cast<FILE*>(f)); }
25*ec63e07aSXin Li
png_fread(void * buffer,size_t size,size_t count,void * stream)26*ec63e07aSXin Li void png_fread(void* buffer, size_t size, size_t count, void* stream) {
27*ec63e07aSXin Li fread(buffer, size, count, static_cast<FILE*>(stream));
28*ec63e07aSXin Li }
29*ec63e07aSXin Li
png_fclose(void * f)30*ec63e07aSXin Li void png_fclose(void* f) { fclose(static_cast<FILE*>(f)); }
31*ec63e07aSXin Li
png_init_io_wrapper(png_structrp png_ptr,void * f)32*ec63e07aSXin Li void png_init_io_wrapper(png_structrp png_ptr, void* f) {
33*ec63e07aSXin Li png_init_io(png_ptr, static_cast<FILE*>(f));
34*ec63e07aSXin Li }
35*ec63e07aSXin Li
png_create_read_struct_wrapper(png_const_charp user_png_ver,png_voidp error_ptr)36*ec63e07aSXin Li png_structp png_create_read_struct_wrapper(png_const_charp user_png_ver,
37*ec63e07aSXin Li png_voidp error_ptr) {
38*ec63e07aSXin Li return png_create_read_struct(user_png_ver, error_ptr, NULL, NULL);
39*ec63e07aSXin Li }
40*ec63e07aSXin Li
png_create_write_struct_wrapper(png_const_charp user_png_ver,png_voidp error_ptr)41*ec63e07aSXin Li png_structp png_create_write_struct_wrapper(png_const_charp user_png_ver,
42*ec63e07aSXin Li png_voidp error_ptr) {
43*ec63e07aSXin Li return png_create_write_struct(user_png_ver, error_ptr, NULL, NULL);
44*ec63e07aSXin Li }
45*ec63e07aSXin Li
png_read_image_wrapper(png_structrp png_ptr,png_bytep image,size_t height,size_t rowbytes)46*ec63e07aSXin Li void png_read_image_wrapper(png_structrp png_ptr, png_bytep image,
47*ec63e07aSXin Li size_t height, size_t rowbytes) {
48*ec63e07aSXin Li png_bytep* ptrs = (png_bytep*)malloc(height * sizeof(png_bytep));
49*ec63e07aSXin Li for (size_t i = 0; i != height; ++i) {
50*ec63e07aSXin Li ptrs[i] = image + (i * rowbytes);
51*ec63e07aSXin Li }
52*ec63e07aSXin Li png_read_image(png_ptr, ptrs);
53*ec63e07aSXin Li free(ptrs);
54*ec63e07aSXin Li }
55*ec63e07aSXin Li
png_write_image_wrapper(png_structrp png_ptr,png_bytep image,size_t height,size_t rowbytes)56*ec63e07aSXin Li void png_write_image_wrapper(png_structrp png_ptr, png_bytep image,
57*ec63e07aSXin Li size_t height, size_t rowbytes) {
58*ec63e07aSXin Li png_bytep* ptrs = (png_bytep*)malloc(height * sizeof(png_bytep));
59*ec63e07aSXin Li for (size_t i = 0; i != height; ++i) {
60*ec63e07aSXin Li ptrs[i] = image + (i * rowbytes);
61*ec63e07aSXin Li }
62*ec63e07aSXin Li png_write_image(png_ptr, ptrs);
63*ec63e07aSXin Li free(ptrs);
64*ec63e07aSXin Li }
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