paul@50 | 1 | #include <stdio.h> |
paul@91 | 2 | #include <stdlib.h> |
paul@50 | 3 | #include <string.h> |
paul@50 | 4 | #include <sys/types.h> |
paul@50 | 5 | #include <sys/stat.h> |
paul@50 | 6 | |
paul@50 | 7 | #include "block_file_accessor.h" |
paul@50 | 8 | |
paul@50 | 9 | |
paul@50 | 10 | |
paul@50 | 11 | BlockFileAccessor::BlockFileAccessor(const char *path, fileid_t fileid) |
paul@50 | 12 | : Accessor(fileid) |
paul@50 | 13 | { |
paul@50 | 14 | /* Obtain the size of the file. */ |
paul@50 | 15 | |
paul@50 | 16 | struct stat buf; |
paul@50 | 17 | |
paul@50 | 18 | if (stat(path, &buf)) |
paul@50 | 19 | { |
paul@50 | 20 | _size = 0; |
paul@50 | 21 | return; |
paul@50 | 22 | } |
paul@50 | 23 | |
paul@50 | 24 | /* Allocate memory. */ |
paul@50 | 25 | |
paul@50 | 26 | _size = buf.st_size; |
paul@50 | 27 | _data = (char *) malloc(_size); |
paul@50 | 28 | |
paul@50 | 29 | if (_data == NULL) |
paul@50 | 30 | return; |
paul@50 | 31 | |
paul@50 | 32 | /* Load the file into memory and initialise the size. */ |
paul@50 | 33 | |
paul@50 | 34 | FILE *fp = fopen(path, "r"); |
paul@50 | 35 | |
paul@50 | 36 | if (fp == NULL) |
paul@50 | 37 | { |
paul@50 | 38 | free(_data); |
paul@50 | 39 | return; |
paul@50 | 40 | } |
paul@50 | 41 | |
paul@50 | 42 | _size = fread(_data, sizeof(char), _size, fp); |
paul@50 | 43 | |
paul@50 | 44 | fclose(fp); |
paul@50 | 45 | } |
paul@50 | 46 | |
paul@55 | 47 | /* Update the size of the file. */ |
paul@55 | 48 | |
paul@55 | 49 | void BlockFileAccessor::set_size(offset_t size) |
paul@55 | 50 | { |
paul@55 | 51 | void *new_data = realloc(_data, size); |
paul@55 | 52 | |
paul@55 | 53 | if (new_data != NULL) |
paul@55 | 54 | { |
paul@55 | 55 | _data = (char *) new_data; |
paul@55 | 56 | |
paul@55 | 57 | if (size > _size) |
paul@55 | 58 | memset(_data + _size, 0, size - _size); |
paul@55 | 59 | |
paul@55 | 60 | Accessor::set_size(size); |
paul@55 | 61 | } |
paul@55 | 62 | } |
paul@55 | 63 | |
paul@56 | 64 | /* Data transfer helper methods. */ |
paul@50 | 65 | |
paul@56 | 66 | /* Fill the populated portion of a flexpage. */ |
paul@56 | 67 | |
paul@56 | 68 | void BlockFileAccessor::fill_populated(Flexpage *flexpage) |
paul@50 | 69 | { |
paul@50 | 70 | offset_t filepos = flexpage->base_offset; |
paul@91 | 71 | address_t addr = flexpage->base_addr; |
paul@91 | 72 | offset_t populated_size = _size - filepos; |
paul@91 | 73 | |
paul@91 | 74 | if (populated_size > flexpage->size) |
paul@91 | 75 | populated_size = flexpage->size; |
paul@50 | 76 | |
paul@50 | 77 | /* Tag the region with file state. */ |
paul@50 | 78 | |
paul@50 | 79 | flexpage->region->fill(fileid, filepos); |
paul@50 | 80 | |
paul@50 | 81 | /* Fill the region with file content. */ |
paul@50 | 82 | |
paul@50 | 83 | memcpy((void *) addr, _data + filepos, populated_size); |
paul@50 | 84 | |
paul@50 | 85 | /* Pad the flexpage with zero. */ |
paul@50 | 86 | |
paul@50 | 87 | if (populated_size < flexpage->size) |
paul@50 | 88 | memset((void *) (addr + populated_size), 0, flexpage->size - populated_size); |
paul@50 | 89 | } |
paul@50 | 90 | |
paul@56 | 91 | /* Flush the populated portion of a flexpage. */ |
paul@55 | 92 | |
paul@56 | 93 | void BlockFileAccessor::flush_populated(Flexpage *flexpage) |
paul@56 | 94 | { |
paul@56 | 95 | offset_t filepos = flexpage->base_offset; |
paul@91 | 96 | address_t addr = flexpage->base_addr; |
paul@91 | 97 | offset_t populated_size = _size - filepos; |
paul@91 | 98 | |
paul@91 | 99 | if (populated_size > flexpage->size) |
paul@91 | 100 | populated_size = flexpage->size; |
paul@50 | 101 | |
paul@50 | 102 | /* Remove the file state tag from the region. */ |
paul@50 | 103 | |
paul@50 | 104 | flexpage->region->flush(); |
paul@50 | 105 | |
paul@50 | 106 | /* Copy the populated region to the block memory. */ |
paul@50 | 107 | |
paul@50 | 108 | memcpy((void *) (_data + filepos), (const void *) addr, populated_size); |
paul@50 | 109 | } |
paul@50 | 110 | |
paul@50 | 111 | // vim: tabstop=4 expandtab shiftwidth=4 |