src/common/files.c

   1 #include "files.h"
   2
   3 #include <stdio.h>
   4 #include <stdint.h>
   5 #include <assert.h>
   6
   7 static long FILE_Stream_GetPos (Stream *r) {
   8   FILE_Stream *rd = (FILE_Stream*)r;
   9   assert(rd != NULL);
  10   assert(rd->fp != NULL);
  11   long pos = ftell(rd->fp);
  12   assert(pos != -1); // fail
  13   return pos;
  14 }
  15
  16 static void FILE_Stream_SetPos (Stream *r, long pos) {
  17   FILE_Stream *rd = (FILE_Stream*)r;
  18   assert(rd != NULL);
  19   assert(rd->fp != NULL);
  20   assert(pos >= 0);
  21   int res = fseek(rd->fp, pos, SEEK_SET);
  22   assert(res == 0); // fail
  23 }
  24
  25 static void FILE_Stream_Read (Stream *r, void *data, size_t size, size_t n) {
  26   FILE_Stream *rd = (FILE_Stream*)r;
  27   assert(rd != NULL);
  28   assert(rd->fp != NULL);
  29   size_t res = fread(data, size, n, rd->fp);
  30   assert(res == n); // fail
  31 }
  32
  33 static void FILE_Stream_Write (Stream *w, const void *data, size_t size, size_t n) {
  34   FILE_Stream *wr = (FILE_Stream*)w;
  35   assert(wr != NULL);
  36   assert(wr->fp != NULL);
  37   size_t res = fwrite(data, size, n, wr->fp);
  38   assert(res == n); // fail
  39 }
  40
  41 void FILE_Assign (FILE_Stream *r, FILE *fp) {
  42   assert(r != NULL);
  43   assert(fp != NULL);
  44   r->base.getpos = FILE_Stream_GetPos;
  45   r->base.setpos = FILE_Stream_SetPos;
  46   r->base.read   = FILE_Stream_Read;
  47   r->base.write  = FILE_Stream_Write;
  48   r->fp = fp;
  49 }
  50
  51 int FILE_Open (FILE_Stream *r, const char *name, const char *mode) {
  52   assert(r != NULL);
  53   assert(name != NULL);
  54   FILE *fp = fopen(name, mode);
  55   if (fp) {
  56     FILE_Assign(r, fp);
  57   }
  58   return fp != NULL;
  59 }
  60
  61 void FILE_Close (FILE_Stream *r) {
  62   assert(r != NULL);
  63   if (r->fp != NULL) {
  64     fclose(r->fp);
  65   }
  66   r->base.getpos = NULL;
  67   r->base.setpos = NULL;
  68   r->base.read   = NULL;
  69   r->base.write  = NULL;
  70   r->fp = NULL;
  71 }