A byte sequence can be stored exactly as it exists in a C object, or it can pass through text-stream translation. Binary data requires the first behavior: each byte must be read or written unchanged. section 14.4
Keep these distinctions in view:
- Text streams may translate newlines, suppress spaces, or convert multibyte characters; those transformations can change binary data's internal structure. section 14.4
- Binary-mode streams skip translation between the file's external representation and the program's internal representation. section 14.4
- Use fread and fwrite to transfer size*nmemb bytes, and treat a smaller return value as an error. section 14.4 section 14.6
- Use ftell and fseek to inspect or change the current file position, measured in bytes from the file's start. section 14.4
1 size_t fread(void* restrict ptr, size_t size, size_t nmemb,
2 FILE* restrict stream);
3 size_t fwrite(void const*restrict ptr, size_t size, size_t nmemb,
4 FILE* restrict stream);
5 int fseek(FILE* stream, long int offset, int whence);
6 long int ftell(FILE* stream);
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These declarations collect the core interfaces for transferring bytes and controlling a binary stream's file position. section 14.4
