ion_file.c

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/******************************************************************************/
/******************************************************************************/

#include "ion_file.h"

ion_boolean_t
ion_fexists(
    char *name
) {
#if defined(ARDUINO)
    return (ion_boolean_t) SD_File_Exists(name);
#else
    return -1 != access(name, F_OK);
#endif
}

ion_file_handle_t
ion_fopen(
    char *name
) {
#if defined(ARDUINO)

    ion_file_handle_t toret;

    toret.file = fopen(name, "r+");

    if (NULL == toret.file) {
        toret.file = fopen(name, "w+");
    }

    return toret;
#else

    ion_file_handle_t file;

    file = fopen(name, "r+b");

    if (NULL == file) {
        file = fopen(name, "w+b");
    }

    return file;
#endif
}

ion_err_t
ion_fclose(
    ion_file_handle_t file
) {
#if defined(ARDUINO)
    fclose(file.file);
    return err_ok;
#else
    fclose(file);
    return err_ok;
#endif
}

ion_err_t
ion_fremove(
    char *name
) {
    int status;

    status = fremove(name);

    if (0 == status) {
        return err_ok;
    }
    else {
        return err_file_delete_error;
    }
}

ion_err_t
ion_fseek(
    ion_file_handle_t   file,
    ion_file_offset_t   seek_to,
    int                 origin
) {
#if defined(ARDUINO)

    if (0 != fseek(file.file, seek_to, origin)) {
        return err_file_bad_seek;
    }

    return err_ok;
#else

    if (0 != fseek(file, seek_to, origin)) {
        return err_file_bad_seek;
    }

    return err_ok;
#endif
}

ion_file_offset_t
ion_ftell(
    ion_file_handle_t file
) {
#if defined(ARDUINO)
    return ftell(file.file);
#else
    return ftell(file);
#endif
}

ion_file_offset_t
ion_fend(
    ion_file_handle_t file
) {
    ion_file_offset_t   previous;
    ion_file_offset_t   to_return;

    previous    = ion_ftell(file);
    ion_fseek(file, 0, ION_FILE_END);
    to_return   = ion_ftell(file);
    ion_fseek(file, previous, ION_FILE_START);

    return to_return;
}

ion_err_t
ion_fwrite(
    ion_file_handle_t   file,
    unsigned int        num_bytes,
    ion_byte_t          *to_write
) {
#if defined(ARDUINO)

    if (num_bytes != (fwrite(to_write, num_bytes, 1, file.file) * num_bytes)) {
        return err_file_write_error;
    }

    return err_ok;
#else
    fwrite(to_write, num_bytes, 1, file);
    return err_ok;
#endif
}

ion_err_t
ion_fwrite_at(
    ion_file_handle_t   file,
    ion_file_offset_t   offset,
    unsigned int        num_bytes,
    ion_byte_t          *to_write
) {
    ion_err_t error;

    error = ion_fseek(file, offset, ION_FILE_START);

    if (err_ok != error) {
        return error;
    }

    error = ion_fwrite(file, num_bytes, to_write);
    return error;
}

ion_err_t
ion_fappend(
    ion_file_handle_t   file,
    unsigned int        num_bytes,
    ion_byte_t          *to_write
) {
    ion_err_t error;

    error = ion_fseek(file, 0, ION_FILE_END);

    if (err_ok != error) {
        return error;
    }

    error = ion_fwrite(file, num_bytes, to_write);
    return error;
}

ion_err_t
ion_fread(
    ion_file_handle_t   file,
    unsigned int        num_bytes,
    ion_byte_t          *write_to
) {
#if defined(ARDUINO)

    if (num_bytes != (fread(write_to, num_bytes, 1, file.file) * num_bytes)) {
        return err_file_read_error;
    }

    return err_ok;
#else

    if (1 != fread(write_to, num_bytes, 1, file)) {
        return err_file_read_error;
    }

    return err_ok;
#endif
}

ion_err_t
ion_fread_at(
    ion_file_handle_t   file,
    ion_file_offset_t   offset,
    unsigned int        num_bytes,
    ion_byte_t          *write_to
) {
    ion_err_t error;

    error = ion_fseek(file, offset, ION_FILE_START);

    if (err_ok != error) {
        return error;
    }

    error = ion_fread(file, num_bytes, write_to);
    return error;
}