aheinecke@4: #include "listutil.h"
aheinecke@4: 
aheinecke@4: #include <stdio.h>
aheinecke@4: #include <stdlib.h>
aheinecke@4: #include <errno.h>
aheinecke@4: #include <fcntl.h>
aheinecke@4: #include <unistd.h>
aheinecke@4: #include <sys/types.h>
aheinecke@4: #include <sys/stat.h>
aheinecke@4: 
aheinecke@4: #define MAX_FILESIZE_KB 1024
aheinecke@4: 
aheinecke@4: void handle_errno()
aheinecke@4: {
aheinecke@4:     printf("Error: %s \n", strerror(errno));
aheinecke@4: }
aheinecke@4: 
aheinecke@4: list_status_t readList(char *fileName, void *data, size_t *size)
aheinecke@4: {
aheinecke@4:     int fd = -1;
aheinecke@4:     struct stat fileStat;
aheinecke@4:     int rc = 0;
aheinecke@4:     ssize_t bRead = 0;
aheinecke@4:     list_status_t retval = UnknownError;
aheinecke@4: 
aheinecke@4:     fd = open(fileName, O_RDONLY);
aheinecke@4:     if (fd == -1) {
aheinecke@4:         handle_errno();
aheinecke@4:         retval = StatFailed;
aheinecke@4:         goto failure;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     rc = fstat(fd, &fileStat);
aheinecke@4:     if (rc < 0) {
aheinecke@4:         printf ("Stat failed with rc: %i\n", rc);
aheinecke@4:         retval = StatFailed;
aheinecke@4:         goto failure;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     // Check the size of the file
aheinecke@4:     if (fileStat.st_size) {
aheinecke@4:         printf("Size zero\n");
aheinecke@4:         retval = StatFailed;
aheinecke@4:         goto failure;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     if (fileStat.st_size / 1024 > MAX_FILESIZE_KB ||
aheinecke@4:             fileStat.st_size >= (size_t)-1) {
aheinecke@4:         printf("File too large\n");
aheinecke@4:         retval = TooLarge;
aheinecke@4:         goto failure;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     // We can cast here as we already checked
aheinecke@4:     // that this size is not too large for size_t
aheinecke@4:     *size = (size_t) fileStat.st_size;
aheinecke@4: 
aheinecke@4:     data = malloc(*size);
aheinecke@4: 
aheinecke@4:     if (data == NULL) {
aheinecke@4:         printf("Malloc failed\n");
aheinecke@4:         retval = UnknownError;
aheinecke@4:         goto failure;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     bRead = read(fd, data, *size);
aheinecke@4: 
aheinecke@4:     if (bRead != *size) {
aheinecke@4:         printf("Read failed");
aheinecke@4:         if (bRead == -1) {
aheinecke@4:             handle_errno();
aheinecke@4:         }
aheinecke@4:         retval = UnknownError;
aheinecke@4:         *size = 0;
aheinecke@4:         if (data) {
aheinecke@4:             free(data);
aheinecke@4:             data = NULL;
aheinecke@4:         }
aheinecke@4:         goto failure;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     retval = Unknown;
aheinecke@4: failure:
aheinecke@4: 
aheinecke@4:     if (fd && fd != -1) {
aheinecke@4:         close(fd);
aheinecke@4:         fd = -1;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     return retval;
aheinecke@4: }
aheinecke@4: 
aheinecke@4: list_status_t readAndVerifyList(char *fileName, void *data, size_t *size)
aheinecke@4: {
aheinecke@4:     int validSig = 0;
aheinecke@4:     char * firstChar = NULL;
aheinecke@4:     int i = 0;
aheinecke@4: 
aheinecke@4:     list_status_t retval = UnknownError;
aheinecke@4:     data = NULL;
aheinecke@4:     size = NULL;
aheinecke@4: 
aheinecke@4:     retval = readList(fileName, data, size);
aheinecke@4: 
aheinecke@4:     if (retval != Unknown) {
aheinecke@4:         return retval;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     if (!data || !size) {
aheinecke@4:         // should not have happend if readList works as specified
aheinecke@4:         return UnknownError;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     firstChar = (char*) data;
aheinecke@4: 
aheinecke@4:     if (*firstChar != 'S') {
aheinecke@4:         printf("Does not start with S\n");
aheinecke@4:         retval = InvalidFormat;
aheinecke@4:     }
aheinecke@4: 
aheinecke@4:     for (i=0; i < *size; i++) {
aheinecke@4:         printf("%c", firstChar + i);
aheinecke@4:     }
aheinecke@4: 
aheinecke@4: failure:
aheinecke@4:     if (retval != Valid && data) {
aheinecke@4:         free(data);
aheinecke@4:         data = NULL;
aheinecke@4:         *size = 0;
aheinecke@4:     }
aheinecke@4:     return retval;
aheinecke@4: }
aheinecke@4: