CgeFile/File.c

#include "CgeFile.h"
#include <assert.h>

int CgeFileError(CgeFile *file) {
    int flags;

    assert(file != NULL);

    CgeFileFlags(file, &flags);
    return flags & CGE_FILE_ERROR;
}

int CgeFileEndOfFile(CgeFile *file) {
    int flags;

    assert(file != NULL);

    CgeFileFlags(file, &flags);
    return flags & CGE_FILE_EOF;
}

int CgeFilePeek(CgeFile *file, void *buffer, size_t size, size_t *actual) {
    int64_t pos;
    size_t n = 0;

    assert(file != NULL);
    assert(buffer != NULL);

    if (CgeFileError(file) || CgeFileEndOfFile(file))
        return 0;

    if (!CgeFileTell(file, &pos) ||
        !CgeFileRead(file, buffer, size, &n) ||
        !CgeFileSeek(file, pos, CGE_FILE_SET))
        return 0;

    if (actual)
        *actual = n;
    return 1;
}