imsz.h

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#ifndef IMSZ_H
#define IMSZ_H
#pragma once
 
#ifndef _POSIX_C_SOURCE
    #define _POSIX_C_SOURCE 1
#endif
 
#ifndef _POSIX_SOURCE
    #define _POSIX_SOURCE
#endif
 
#include <stdint.h>
#include <stdio.h>
 
#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
    #include <windows.h>
#endif
 
#ifdef __cplusplus
extern "C" {
#endif
 
#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
    #ifdef IMSZ_STATIC
        #define IMSZ_EXPORT
    #else
        #define IMSZ_EXPORT __declspec(dllimport)
    #endif
#else
    #if (defined(__GNUC__) && __GNUC__ >= 4) || defined(__clang__)
        #define IMSZ_EXPORT __attribute__ ((visibility ("default")))
    #else
        #define IMSZ_EXPORT extern
    #endif
#endif
 
typedef enum ImError {
    IMSZ_OK              =  0, 
    IMSZ_ERR_IO          = -1, 
    IMSZ_ERR_PARSER      = -2, 
    IMSZ_ERR_UNSUPPORTED = -3, 
} ImError;
 
typedef enum ImFormat {
    IMSZ_GIF     =  1u, 
    IMSZ_PNG     =  2u, 
    IMSZ_BMP     =  3u, 
    IMSZ_JPEG    =  4u, 
    IMSZ_WEBP    =  5u, 
    IMSZ_QOI     =  6u, 
    IMSZ_PSD     =  7u, 
    IMSZ_XCF     =  8u, 
    IMSZ_ICO     =  9u, 
    IMSZ_AVIF    = 10u, 
    IMSZ_TIFF    = 11u, 
    IMSZ_OpenEXR = 12u, 
    IMSZ_PCX     = 13u, 
    IMSZ_TGA     = 14u, 
    IMSZ_DDS     = 15u, 
    IMSZ_HEIF    = 16u, 
    IMSZ_JP2K    = 17u, 
    IMSZ_DIB     = 18u, 
    IMSZ_VTF     = 19u, 
} ImFormat;
 
#define IMSZ_INIT { .width = (uint64_t)0, .height = (uint64_t)0, .format = 0 }
 
typedef struct ImInfo {
    uint64_t width;  
    uint64_t height; 
 
    unsigned int format;
} ImInfo;
 
IMSZ_EXPORT int imsz_from_path(const char *path, ImInfo *info_ptr);
 
IMSZ_EXPORT int imsz_from_buffer(const void *buf, size_t len, ImInfo *info_ptr);
 
IMSZ_EXPORT int imsz_from_fd(int fd, ImInfo *info_ptr);
 
IMSZ_EXPORT const char *imsz_format_name(unsigned int format);
 
#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__) || defined(__DOXYGEN__)
    IMSZ_EXPORT int imsz_from_pathw(const wchar_t *path, ImInfo *info_ptr);
 
    IMSZ_EXPORT int imsz_from_handle(HANDLE hnd, ImInfo *info_ptr);
 
    IMSZ_EXPORT const wchar_t *imsz_format_namew(unsigned int format);
 
    #define imsz_from_file(fp, info_ptr) imsz_from_fd(_fileno((fp)), (info_ptr))
 
    #define imsz_2_(arg1, arg2) \
        _Generic((arg1), \
            wchar_t*:       imsz_from_pathw((const wchar_t*)(arg1), (arg2)), \
            const wchar_t*: imsz_from_pathw((const wchar_t*)(arg1), (arg2)), \
            char*:          imsz_from_path((const char*)(arg1), (arg2)), \
            const char*:    imsz_from_path((const char*)(arg1), (arg2)), \
            FILE*:          imsz_from_file((FILE*)(arg1), (arg2)), \
            HANDLE:         imsz_from_handle((HANDLE)(arg1), (arg2)), \
            int:            imsz_from_fd((intptr_t)(arg1), (arg2)) \
        )
#else
    #define imsz_from_file(fp, info_ptr) imsz_from_fd(fileno((fp)), (info_ptr))
 
    #define imsz_2_(arg1, arg2) \
        _Generic((arg1), \
            char*:          imsz_from_path((const char*)(arg1), (arg2)), \
            const char*:    imsz_from_path((const char*)(arg1), (arg2)), \
            FILE*:          imsz_from_file((FILE*)(arg1), (arg2)), \
            int:            imsz_from_fd((intptr_t)(arg1), (arg2)) \
        )
#endif
 
 
#define imsz_3_(arg1, arg2, arg3) \
    imsz_from_buffer((arg1), (arg2), (arg3))
 
#define imsz_va_dispatch_(arg1, arg2, arg3, arg4, ...) arg4
 
#ifdef __cplusplus
}
#endif
 
#if defined(__cplusplus) || defined(__DOXYGEN__)
 
inline int imsz(const char *path, ImInfo *info_ptr) {
    return imsz_from_path(path, info_ptr);
}
 
inline int imsz(const void *buf, size_t len, ImInfo *info_ptr) {
    return imsz_from_buffer(buf, len, info_ptr);
}
 
inline int imsz(int fd, ImInfo *info_ptr) {
    return imsz_from_fd(fd, info_ptr);
}
 
inline int imsz(FILE *file, ImInfo *info_ptr) {
    return imsz_from_file(file, info_ptr);
}
 
#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__) || defined(__DOXYGEN__)
inline int imsz(const wchar_t *path, ImInfo *info_ptr) {
    return imsz_from_pathw(path, info_ptr);
}
 
inline int imsz(HANDLE hnd, ImInfo *info_ptr) {
    return imsz_from_handle(hnd, info_ptr);
}
#endif
#endif
 
#if !defined(__cplusplus) || defined(__DOXYGEN__)
 
    #define imsz(...) imsz_va_dispatch_(__VA_ARGS__, imsz_3_, imsz_2_, imsz_error_)(__VA_ARGS__)
 
#endif
 
 
#endif