knetfile.h

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#ifndef KNETFILE_H
#define KNETFILE_H

#include <stdint.h>
#include <fcntl.h>

#ifndef _WIN32
#define netread(fd, ptr, len) read(fd, ptr, len)
#define netwrite(fd, ptr, len) write(fd, ptr, len)
#define netclose(fd) close(fd)
#else
#include <winsock2.h>
#define netread(fd, ptr, len) recv(fd, ptr, len, 0)
#define netwrite(fd, ptr, len) send(fd, ptr, len, 0)
#define netclose(fd) closesocket(fd)
#endif

// FIXME: currently I/O is unbuffered

#define KNF_TYPE_LOCAL 1
#define KNF_TYPE_FTP   2
#define KNF_TYPE_HTTP  3

typedef struct knetFile_s {
        int type, fd;
        int64_t offset;
        char *host, *port;

        // the following are for FTP only
        int ctrl_fd, pasv_ip[4], pasv_port, max_response, no_reconnect, is_ready;
        char *response, *retr, *size_cmd;
        int64_t seek_offset; // for lazy seek
    int64_t file_size;

        // the following are for HTTP only
        char *path, *http_host;
} knetFile;

#define knet_tell(fp) ((fp)->offset)
#define knet_fileno(fp) ((fp)->fd)

#ifdef __cplusplus
extern "C" {
#endif

#ifdef _WIN32
        int knet_win32_init();
        void knet_win32_destroy();
#endif

        knetFile *knet_open(const char *fn, const char *mode);

        /* 
           This only works with local files.
         */
        knetFile *knet_dopen(int fd, const char *mode);

        /*
          If ->is_ready==0, this routine updates ->fd; otherwise, it simply
          reads from ->fd.
         */
        ssize_t knet_read(knetFile *fp, void *buf, size_t len);

        /*
          This routine only sets ->offset and ->is_ready=0. It does not
          communicate with the FTP server.
         */
        off_t knet_seek(knetFile *fp, off_t off, int whence);
        int knet_close(knetFile *fp);

#ifdef __cplusplus
}
#endif

#endif