bertos/io/kblock_posix.c

   1 /**
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  27  * the GNU General Public License.
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  29  * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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  32  *
  33  * \author Francesco Sacchi <batt@develer.com>
  34  *
  35  * \brief KBlock interface over libc files.
  36  *
  37  * notest: avr
  38  * notest: arm
  39  */
  40
  41
  42 #include "kblock_posix.h"
  43 #include <string.h>
  44 #include <stdio.h>
  45
  46
  47 static int kblockposix_load(KBlock *b, block_idx_t index)
  48 {
  49         KBlockPosix *f = KBLOCKPOSIX_CAST(b);
  50         fseek(f->fp, index * b->blk_size, SEEK_SET);
  51         return (fread(f->b.priv.buf, 1, b->blk_size, f->fp) == b->blk_size) ? 0 : EOF;
  52 }
  53
  54 static int kblockposix_store(struct KBlock *b, block_idx_t index)
  55 {
  56         KBlockPosix *f = KBLOCKPOSIX_CAST(b);
  57         fseek(f->fp, index * b->blk_size, SEEK_SET);
  58         return (fwrite(f->b.priv.buf, 1, b->blk_size, f->fp) == b->blk_size) ? 0 : EOF;
  59 }
  60
  61 static size_t kblockposix_readBuf(struct KBlock *b, void *buf, size_t offset, size_t size)
  62 {
  63         KBlockPosix *f = KBLOCKPOSIX_CAST(b);
  64         memcpy(buf, (uint8_t *)f->b.priv.buf + offset, size);
  65         return size;
  66 }
  67
  68 static size_t kblockposix_readDirect(struct KBlock *b, block_idx_t index, void *buf, size_t offset, size_t size)
  69 {
  70         KBlockPosix *f = KBLOCKPOSIX_CAST(b);
  71         fseek(f->fp, index * b->blk_size + offset, SEEK_SET);
  72         return fread(buf, 1, size, f->fp);
  73 }
  74
  75 static size_t kblockposix_writeBuf(struct KBlock *b, const void *buf, size_t offset, size_t size)
  76 {
  77         KBlockPosix *f = KBLOCKPOSIX_CAST(b);
  78         memcpy((uint8_t *)f->b.priv.buf + offset, buf, size);
  79         return size;
  80 }
  81
  82 static size_t kblockposix_writeDirect(struct KBlock *b, block_idx_t index, const void *buf, size_t offset, size_t size)
  83 {
  84         KBlockPosix *f = KBLOCKPOSIX_CAST(b);
  85         ASSERT(buf);
  86         ASSERT(index < b->blk_cnt);
  87         fseek(f->fp, index * b->blk_size + offset, SEEK_SET);
  88         return fwrite(buf, 1, size, f->fp);
  89 }
  90
  91 static int kblockposix_error(struct KBlock *b)
  92 {
  93         KBlockPosix *f = KBLOCKPOSIX_CAST(b);
  94         return ferror(f->fp);
  95 }
  96
  97
  98 static void kblockposix_claererr(struct KBlock *b)
  99 {
 100         KBlockPosix *f = KBLOCKPOSIX_CAST(b);
 101         clearerr(f->fp);
 102 }
 103
 104
 105 static int kblockposix_close(struct KBlock *b)
 106 {
 107         KBlockPosix *f = KBLOCKPOSIX_CAST(b);
 108
 109         return fflush(f->fp) | fclose(f->fp);
 110 }
 111
 112
 113 static const KBlockVTable kblockposix_hwbuffered_vt =
 114 {
 115         .readDirect = kblockposix_readDirect,
 116
 117         .readBuf = kblockposix_readBuf,
 118         .writeBuf = kblockposix_writeBuf,
 119         .load = kblockposix_load,
 120         .store = kblockposix_store,
 121
 122         .error = kblockposix_error,
 123         .clearerr = kblockposix_claererr,
 124         .close = kblockposix_close,
 125 };
 126
 127 static const KBlockVTable kblockposix_swbuffered_vt =
 128 {
 129         .readDirect = kblockposix_readDirect,
 130         .writeDirect =kblockposix_writeDirect,
 131
 132         .readBuf = kblock_swReadBuf,
 133         .writeBuf = kblock_swWriteBuf,
 134         .load = kblock_swLoad,
 135         .store = kblock_swStore,
 136
 137         .error = kblockposix_error,
 138         .clearerr = kblockposix_claererr,
 139         .close = kblockposix_close,
 140 };
 141
 142 static const KBlockVTable kblockposix_unbuffered_vt =
 143 {
 144         .readDirect = kblockposix_readDirect,
 145         .writeDirect =kblockposix_writeDirect,
 146
 147         .error = kblockposix_error,
 148         .clearerr = kblockposix_claererr,
 149         .close = kblockposix_close,
 150 };
 151
 152
 153
 154 void kblockposix_init(KBlockPosix *f, FILE *fp, bool hwbuf, void *buf, size_t block_size, block_idx_t block_count)
 155 {
 156         ASSERT(f);
 157         ASSERT(fp);
 158         ASSERT(block_size);
 159
 160         memset(f, 0, sizeof(*f));
 161
 162         DB(f->b.priv.type = KBT_KBLOCKPOSIX);
 163
 164         f->fp = fp;
 165         f->b.blk_size = block_size;
 166         f->b.blk_cnt = block_count;
 167
 168         f->b.priv.flags |= KB_PARTIAL_WRITE;
 169         if (buf)
 170         {
 171                 f->b.priv.flags |= KB_BUFFERED;
 172                 f->b.priv.buf = buf;
 173                 if (hwbuf)
 174                         f->b.priv.vt = &kblockposix_hwbuffered_vt;
 175                 else
 176                         f->b.priv.vt = &kblockposix_swbuffered_vt;
 177                 kblockposix_load(&f->b, 0);
 178                 f->b.priv.curr_blk = 0;
 179         }
 180         else
 181                 f->b.priv.vt = &kblockposix_unbuffered_vt;
 182 }