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_Reader_GetPos (Reader *r) {
   8   FILE_Reader *rd = (FILE_Reader*)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_Reader_SetPos (Reader *r, long pos) {
  17   FILE_Reader *rd = (FILE_Reader*)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_Reader_Read (Reader *r, void *data, size_t size, size_t n) {
  26   FILE_Reader *rd = (FILE_Reader*)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 void FILE_AssignReader (FILE_Reader *r, FILE *fp) {
  34   assert(r != NULL);
  35   assert(fp != NULL);
  36   r->base.getpos = FILE_Reader_GetPos;
  37   r->base.setpos = FILE_Reader_SetPos;
  38   r->base.read = FILE_Reader_Read;
  39   r->fp = fp;
  40 }
  41
  42 int FILE_OpenReader (FILE_Reader *r, const char *name) {
  43   assert(r != NULL);
  44   assert(name != NULL);
  45   FILE *fp = fopen(name, "rb");
  46   if (fp) {
  47     FILE_AssignReader(r, fp);
  48   }
  49   return fp != NULL;
  50 }
  51
  52 void FILE_CloseReader (FILE_Reader *r) {
  53   assert(r != NULL);
  54   if (r->fp != NULL) {
  55     fclose(r->fp);
  56   }
  57   r->base.getpos = NULL;
  58   r->base.setpos = NULL;
  59   r->base.read = NULL;
  60   r->fp = NULL;
  61 }
  62
  63 static long FILE_Writer_GetPos (Writer *w) {
  64   FILE_Writer *wr = (FILE_Writer*)w;
  65   assert(wr != NULL);
  66   assert(wr->fp != NULL);
  67   long pos = ftell(wr->fp);
  68   assert(pos != -1); // fail
  69   return pos;
  70 }
  71
  72 static void FILE_Writer_SetPos (Writer *w, long pos) {
  73   FILE_Writer *wr = (FILE_Writer*)w;
  74   assert(wr != NULL);
  75   assert(wr->fp != NULL);
  76   assert(pos >= 0);
  77   int res = fseek(wr->fp, pos, SEEK_SET);
  78   assert(res == 0); // fail
  79 }
  80
  81 static void FILE_Writer_Write (Writer *w, const void *data, size_t size, size_t n) {
  82   FILE_Writer *wr = (FILE_Writer*)w;
  83   assert(wr != NULL);
  84   assert(wr->fp != NULL);
  85   size_t res = fwrite(data, size, n, wr->fp);
  86   assert(res == n); // fail
  87 }
  88
  89 void FILE_AssignWriter (FILE_Writer *w, FILE *fp) {
  90   assert(w != NULL);
  91   assert(fp != NULL);
  92   w->base.getpos = FILE_Writer_GetPos;
  93   w->base.setpos = FILE_Writer_SetPos;
  94   w->base.write = FILE_Writer_Write;
  95   w->fp = fp;
  96 }
  97
  98 int FILE_OpenWriter (FILE_Writer *w, const char *name) {
  99   assert(w != NULL);
 100   assert(name != NULL);
 101   FILE *fp = fopen(name, "wb");
 102   if (fp) {
 103     FILE_AssignWriter(w, fp);
 104   }
 105   return fp != NULL;
 106 }
 107
 108 void FILE_CloseWriter (FILE_Writer *w) {
 109   assert(w != NULL);
 110   if (w->fp != NULL) {
 111     fclose(w->fp);
 112   }
 113   w->base.getpos = NULL;
 114   w->base.setpos = NULL;
 115   w->base.write = NULL;
 116   w->fp = NULL;
 117 }