- if (n > (read_buffer_size - read_buffer_len)) {
- read_buffer_size += n;
- if (!read_buffer)
- read_buffer = (char *)malloc(read_buffer_size);
- else
- read_buffer = (char *)realloc(read_buffer,read_buffer_size);
- if (!read_buffer) out_of_memory("read check");
- read_buffer_p = read_buffer;
- }
-
- n = read(f,read_buffer+read_buffer_len,n);
- if (n > 0) {
- read_buffer_len += n;
- }
-}
-
-
-static int readfd(int fd,char *buffer,int N)
-{
- int ret;
- int total=0;
-
- while (total < N)
- {
- if (read_buffer_len > 0) {
- ret = MIN(read_buffer_len,N-total);
- memcpy(buffer+total,read_buffer_p,ret);
- read_buffer_p += ret;
- read_buffer_len -= ret;
- } else {
- ret = read(fd,buffer + total,N - total);
- }
-
- if (ret <= 0)
- return total;
- total += ret;
- }
- return total;
-}
-
+ len = MAX(len,CHUNK_SIZE);
+ len = MIN(len,map_size - offset);