src/common/files.c

   1 #include "files.h"
   2
   3 #include <stdio.h>
   4 #include <stdint.h>
   5 #include <assert.h>
   6
   7 static void FILE_Reader_SetPos (Reader *r, int pos) {
   8   FILE_Reader *rd = (FILE_Reader*)r;
   9   assert(rd != NULL);
  10   assert(rd->fp != NULL);
  11   assert(pos >= 0);
  12   int res = fseek(rd->fp, pos, SEEK_SET);
  13   assert(res == 0); // fail
  14 }
  15
  16 static void FILE_Reader_Read (Reader *r, void *data, size_t size, size_t n) {
  17   FILE_Reader *rd = (FILE_Reader*)r;
  18   assert(rd != NULL);
  19   assert(rd->fp != NULL);
  20   size_t res = fread(data, size, n, rd->fp);
  21   assert(res == n); // fail
  22 }
  23
  24 void FILE_AssignReader (FILE_Reader *r, FILE *fp) {
  25   assert(r != NULL);
  26   assert(fp != NULL);
  27   r->base.setpos = FILE_Reader_SetPos;
  28   r->base.read = FILE_Reader_Read;
  29   r->fp = fp;
  30 }
  31
  32 int FILE_OpenReader (FILE_Reader *r, const char *name) {
  33   assert(r != NULL);
  34   assert(name != NULL);
  35   FILE *fp = fopen(name, "rb");
  36   if (fp) {
  37     FILE_AssignReader(r, fp);
  38   }
  39   return fp != NULL;
  40 }
  41
  42 void FILE_CloseReader (FILE_Reader *r) {
  43   assert(r != NULL);
  44   if (r->fp != NULL) {
  45     fclose(r->fp);
  46   }
  47   r->base.setpos = NULL;
  48   r->base.read = NULL;
  49   r->fp = NULL;
  50 }
  51
  52 static void FILE_Writer_SetPos (Writer *w, int pos) {
  53   FILE_Writer *wr = (FILE_Writer*)w;
  54   assert(wr != NULL);
  55   assert(wr->fp != NULL);
  56   assert(pos >= 0);
  57   int res = fseek(wr->fp, pos, SEEK_SET);
  58   assert(res == 0); // fail
  59 }
  60
  61 static void FILE_Writer_Write (Writer *w, const void *data, size_t size, size_t n) {
  62   FILE_Writer *wr = (FILE_Writer*)w;
  63   assert(wr != NULL);
  64   assert(wr->fp != NULL);
  65   size_t res = fwrite(data, size, n, wr->fp);
  66   assert(res == n); // fail
  67 }
  68
  69 void FILE_AssignWriter (FILE_Writer *w, FILE *fp) {
  70   assert(w != NULL);
  71   assert(fp != NULL);
  72   w->base.setpos = FILE_Writer_SetPos;
  73   w->base.write = FILE_Writer_Write;
  74   w->fp = fp;
  75 }
  76
  77 int FILE_OpenWriter (FILE_Writer *w, const char *name) {
  78   assert(w != NULL);
  79   assert(name != NULL);
  80   FILE *fp = fopen(name, "wb");
  81   if (fp) {
  82     FILE_AssignWriter(w, fp);
  83   }
  84   return fp != NULL;
  85 }
  86
  87 void FILE_CloseWriter (FILE_Writer *w) {
  88   assert(w != NULL);
  89   if (w->fp != NULL) {
  90     fclose(w->fp);
  91   }
  92   w->base.setpos = NULL;
  93   w->base.write = NULL;
  94   w->fp = NULL;
  95 }