/src/os/rt-thread/ftk_mmap_rtthread.c

http://ftk.googlecode.com/ · C · 115 lines · 68 code · 18 blank · 29 comment · 14 complexity · d2c41628967c2af26a52fff4b6ba5e92 MD5 · raw file

  1. /*
  2. * File: ftk_mmap_rtthread.c
  3. * Author: Jiao JinXing <jiaojinxing1987@gmail.com>
  4. * Brief: RT-Thread mmap implemention.
  5. *
  6. * Copyright (c) 2009 - 2010 Jiao JinXing <jiaojinxing1987@gmail.com>
  7. *
  8. * Licensed under the Academic Free License version 2.1
  9. *
  10. * This program is free software; you can redistribute it and/or modify
  11. * it under the terms of the GNU General Public License as published by
  12. * the Free Software Foundation; either version 2 of the License, or
  13. * (at your option) any later version.
  14. *
  15. * This program is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU General Public License
  21. * along with this program; if not, write to the Free Software
  22. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23. */
  24. /*
  25. * History:
  26. * ================================================================
  27. * 2010-10-2 Jiao JinXing <jiaojinxing1987@gmail.com> created
  28. *
  29. */
  30. #include "ftk_log.h"
  31. #include "ftk_mmap.h"
  32. #include "ftk_allocator.h"
  33. struct _FtkMmap
  34. {
  35. int fd;
  36. void* data;
  37. size_t length;
  38. };
  39. int ftk_mmap_exist(const char* filename)
  40. {
  41. struct stat st = {0};
  42. return_val_if_fail(filename != NULL, 0);
  43. return stat(filename, &st) == 0;
  44. }
  45. FtkMmap* ftk_mmap_create(const char* filename, size_t offset, size_t size)
  46. {
  47. FtkMmap* thiz = NULL;
  48. struct stat st = {0};
  49. ssize_t ret = 0;
  50. return_val_if_fail(filename != NULL, NULL);
  51. return_val_if_fail(stat(filename, &st) == 0, NULL);
  52. return_val_if_fail(offset < st.st_size, NULL);
  53. size = (offset + size) <= st.st_size ? size : st.st_size - offset;
  54. thiz = FTK_ZALLOC(sizeof(FtkMmap));
  55. return_val_if_fail(thiz != NULL, NULL);
  56. thiz->fd = open(filename, O_RDONLY, 0);
  57. if (thiz->fd < 0)
  58. {
  59. FTK_ZFREE(thiz, sizeof(*thiz));
  60. return NULL;
  61. }
  62. thiz->length = size;
  63. thiz->data = FTK_ZALLOC(size);
  64. if(thiz->data == NULL)
  65. {
  66. close(thiz->fd);
  67. FTK_ZFREE(thiz, sizeof(*thiz));
  68. return NULL;
  69. }
  70. ret = read(thiz->fd, thiz->data, size);
  71. close(thiz->fd);
  72. if (ret != size)
  73. {
  74. FTK_ZFREE(thiz->data, size);
  75. FTK_ZFREE(thiz, sizeof(*thiz));
  76. return NULL;
  77. }
  78. return thiz;
  79. }
  80. void* ftk_mmap_data(FtkMmap* thiz)
  81. {
  82. return_val_if_fail(thiz != NULL, NULL);
  83. return thiz->data;
  84. }
  85. size_t ftk_mmap_length(FtkMmap* thiz)
  86. {
  87. return_val_if_fail(thiz != NULL, 0);
  88. return thiz->length;
  89. }
  90. void ftk_mmap_destroy(FtkMmap* thiz)
  91. {
  92. if (thiz != NULL)
  93. {
  94. FTK_ZFREE(thiz->data, thiz->length);
  95. FTK_ZFREE(thiz, sizeof(*thiz));
  96. }
  97. }