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| 1769 | yogev_ezra | 1 | #ifndef __MENUET_FILE_H_INCLUDED_ |
| 2 | #define __MENUET_FILE_H_INCLUDED_ |
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| 3 | |||
| 4 | #include |
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| 5 | #include |
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| 6 | |||
| 7 | // Menuet file interface. |
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| 8 | |||
| 9 | namespace Menuet // All menuet functions, types and data are nested in the (Menuet) namespace. |
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| 10 | { |
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| 11 | struct _FileDataStruct; |
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| 12 | typedef _FileDataStruct *TFileData; |
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| 13 | |||
| 14 | TFileData FileOpen(const char *name, unsigned int buffer_length = 1024); |
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| 15 | int FileClose(TFileData file_data); |
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| 16 | bool FileEof(TFileData file_data); |
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| 17 | unsigned int FileGetPosition(TFileData file_data); |
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| 18 | void FileSetPosition(TFileData file_data, unsigned int pos); |
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| 19 | void FileReset(TFileData file_data); |
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| 20 | unsigned int FileGetLength(TFileData file_data); |
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| 21 | int FileTestRead(TFileData file_data); |
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| 22 | int FileRead(TFileData file_data, void *mem, int size); |
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| 23 | } |
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| 24 | |||
| 25 | #ifdef __MENUET__ |
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| 26 | |||
| 27 | namespace Menuet |
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| 28 | { |
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| 29 | // Define the file data structure. |
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| 30 | |||
| 31 | struct _FileDataStruct |
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| 32 | { |
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| 33 | unsigned int length; |
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| 34 | unsigned int position; |
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| 35 | unsigned int *buffer; |
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| 36 | unsigned int access_param[5]; |
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| 37 | |||
| 38 | enum {PosName = (unsigned int)(((_FileDataStruct*)0)->access_param + 5)}; |
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| 39 | }; |
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| 40 | |||
| 41 | // Inline functions. |
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| 42 | |||
| 43 | inline bool FileEof(TFileData file_data) |
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| 44 | { |
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| 45 | return file_data && file_data->position >= file_data->length; |
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| 46 | } |
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| 47 | |||
| 48 | inline unsigned int FileGetPosition(TFileData file_data) |
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| 49 | { |
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| 50 | return file_data ? file_data->position : 0; |
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| 51 | } |
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| 52 | |||
| 53 | inline void FileReset(TFileData file_data) |
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| 54 | { |
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| 55 | if (!file_data) return; |
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| 56 | file_data->length = -1; |
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| 57 | file_data->position = 0; |
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| 58 | if (file_data->buffer) file_data->buffer[1] = 0; |
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| 59 | } |
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| 60 | |||
| 61 | // Functions. |
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| 62 | |||
| 63 | int _FileAccess(void *file_access_param); |
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| 64 | |||
| 65 | TFileData FileOpen(const char *name, unsigned int buffer_length) |
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| 66 | { |
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| 67 | if (!name || !name[0]) return 0; |
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| 68 | unsigned int name_len = StrLen(name) + 1; |
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| 69 | unsigned int data_len = (_FileDataStruct::PosName + name_len + 3) & ~3; |
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| 70 | buffer_length = (buffer_length / MENUET_FILE_BLOCK_SIZE) * MENUET_FILE_BLOCK_SIZE; |
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| 71 | if (buffer_length) data_len += buffer_length + 2*sizeof(unsigned int); |
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| 72 | TFileData file = (TFileData)Alloc(_FileDataStruct::PosName + data_len); |
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| 73 | if (!file) return 0; |
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| 74 | file->length = -1; |
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| 75 | file->position = 0; |
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| 76 | if (buffer_length) |
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| 77 | { |
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| 78 | file->buffer = (unsigned int*)((char*)file + data_len) - 2; |
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| 79 | file->buffer[0] = buffer_length; |
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| 80 | file->buffer[1] = 0; |
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| 81 | } |
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| 82 | MemCopy(file->access_param + 5, name, name_len); |
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| 83 | unsigned int attr[40/4]; |
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| 84 | file->access_param[0] = 5; |
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| 85 | file->access_param[1] = 0; |
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| 86 | file->access_param[2] = 0; |
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| 87 | file->access_param[3] = 0; |
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| 88 | file->access_param[4] = (int)attr; |
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| 89 | _FileAccess(file->access_param); |
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| 90 | file->length = attr[32/4]; |
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| 91 | return file; |
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| 92 | } |
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| 93 | |||
| 94 | int FileClose(TFileData file_data) |
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| 95 | { |
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| 96 | if (!file_data) return -1; |
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| 97 | Free(file_data); |
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| 98 | return 0; |
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| 99 | } |
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| 100 | |||
| 101 | void FileSetPosition(TFileData file_data, unsigned int pos) |
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| 102 | { |
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| 103 | if (!file_data) return; |
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| 104 | if (file_data->buffer && file_data->buffer[1]) |
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| 105 | { |
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| 106 | if (pos >= file_data->position && pos < file_data->position + file_data->buffer[1]) |
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| 107 | { |
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| 108 | file_data->buffer[1] -= pos - file_data->position; |
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| 109 | } |
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| 110 | else file_data->buffer[1] = 0; |
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| 111 | } |
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| 112 | file_data->position = pos; |
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| 113 | } |
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| 114 | |||
| 115 | int _FileReadBuffer(TFileData file_data, void *mem, int size, void *temp_mem = 0) |
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| 116 | { |
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| 117 | unsigned int *buffer; |
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| 118 | if (!file_data || !mem || size <= 0) return -1; |
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| 119 | if (file_data->buffer) buffer = file_data->buffer; |
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| 120 | else if (temp_mem) |
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| 121 | { |
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| 122 | buffer = (unsigned int*)((char*)temp_mem + MENUET_FILE_BLOCK_SIZE); |
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| 123 | } |
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| 124 | else return 0; |
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| 125 | if (!buffer[1]) return 0; |
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| 126 | if (file_data->position >= file_data->length) |
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| 127 | { |
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| 128 | buffer[1] = 0; |
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| 129 | return 0; |
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| 130 | } |
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| 131 | unsigned int buf_size = file_data->length - file_data->position; |
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| 132 | if (buf_size > buffer[1]) buf_size = buffer[1]; |
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| 133 | if ((unsigned int)size >= buf_size) size = buf_size; |
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| 134 | MemCopy(mem, (char*)buffer - buffer[1], size); |
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| 135 | file_data->position += size; |
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| 136 | if ((unsigned int)size >= buf_size) buffer[1] = 0; |
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| 137 | else buffer[1] -= size; |
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| 138 | return size; |
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| 139 | } |
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| 140 | |||
| 141 | int _FileReadSystem(TFileData file_data, void *mem, int size) |
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| 142 | { |
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| 143 | int res; |
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| 144 | unsigned int len0, len1; |
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| 145 | size /= MENUET_FILE_BLOCK_SIZE; |
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| 146 | if (!file_data || !mem || size <= 0) return -1; |
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| 147 | file_data->access_param[0] = 0; |
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| 148 | file_data->access_param[1] = (file_data->position / MENUET_FILE_BLOCK_SIZE) * MENUET_FILE_BLOCK_SIZE; |
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| 149 | file_data->access_param[2] = 0; |
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| 150 | file_data->access_param[3] = size * MENUET_FILE_BLOCK_SIZE; |
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| 151 | file_data->access_param[4] = (unsigned int)mem; |
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| 152 | res = _FileAccess(file_data->access_param); |
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| 153 | if (res != 0 && res != 6) return (res & 255) - 1024; |
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| 154 | if (file_data->length <= file_data->position) return 0; |
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| 155 | len0 = file_data->length - file_data->position; |
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| 156 | len1 = size * MENUET_FILE_BLOCK_SIZE - (file_data->position % MENUET_FILE_BLOCK_SIZE); |
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| 157 | return (len0 <= len1) ? len0 : len1; |
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| 158 | } |
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| 159 | |||
| 160 | int _FileBufferSystem(TFileData file_data, void *&temp_mem) |
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| 161 | { |
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| 162 | int res; |
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| 163 | unsigned int *buffer; |
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| 164 | if (!file_data) return -1; |
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| 165 | if (file_data->buffer) buffer = file_data->buffer; |
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| 166 | else |
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| 167 | { |
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| 168 | if (!temp_mem) |
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| 169 | { |
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| 170 | temp_mem = Alloc(MENUET_FILE_BLOCK_SIZE + 2*sizeof(unsigned int)); |
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| 171 | if (!temp_mem) return -10; |
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| 172 | } |
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| 173 | buffer = (unsigned int*)((char*)temp_mem + MENUET_FILE_BLOCK_SIZE); |
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| 174 | buffer[0] = MENUET_FILE_BLOCK_SIZE; |
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| 175 | } |
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| 176 | buffer[1] = buffer[0]; |
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| 177 | res = _FileReadSystem(file_data, (char*)buffer - buffer[1], buffer[1]); |
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| 178 | if (res < 0) buffer[1] = 0; |
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| 179 | else buffer[1] -= file_data->position % MENUET_FILE_BLOCK_SIZE; |
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| 180 | return res; |
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| 181 | } |
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| 182 | |||
| 183 | int FileTestRead(TFileData file_data) |
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| 184 | { |
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| 185 | int res; |
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| 186 | void *temp_mem = 0; |
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| 187 | if (!file_data) return -1; |
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| 188 | if (file_data->buffer && file_data->buffer[1]) return 0; |
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| 189 | res = _FileBufferSystem(file_data, temp_mem); |
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| 190 | if (temp_mem) Free(temp_mem); |
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| 191 | return (res < 0) ? res : 0; |
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| 192 | } |
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| 193 | |||
| 194 | int FileRead(TFileData file_data, void *mem, int size) |
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| 195 | { |
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| 196 | int tlen, res, read_len; |
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| 197 | void *temp_mem = 0; |
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| 198 | res = _FileReadBuffer(file_data, mem, size); |
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| 199 | if (res < 0 || res >= size) return res; |
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| 200 | read_len = res; |
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| 201 | mem = (char*)mem + res; |
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| 202 | size -= res; |
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| 203 | tlen = file_data->position % MENUET_FILE_BLOCK_SIZE; |
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| 204 | if (tlen) |
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| 205 | { |
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| 206 | res = _FileBufferSystem(file_data, temp_mem); |
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| 207 | if (res < 0) |
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| 208 | { |
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| 209 | if (temp_mem) Free(temp_mem); |
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| 210 | return read_len ? read_len : res; |
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| 211 | } |
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| 212 | res = _FileReadBuffer(file_data, mem, size); |
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| 213 | read_len += res; |
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| 214 | if (res >= size || file_data->length <= file_data->position || |
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| 215 | file_data->length - file_data->position <= res) |
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| 216 | { |
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| 217 | if (temp_mem) Free(temp_mem); |
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| 218 | return read_len; |
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| 219 | } |
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| 220 | mem = (char*)mem + res; |
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| 221 | size -= res; |
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| 222 | } |
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| 223 | if (size >= (file_data->buffer ? file_data->buffer[0] : MENUET_FILE_BLOCK_SIZE)) |
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| 224 | { |
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| 225 | res = _FileReadSystem(file_data, mem, size); |
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| 226 | if (res < 0) |
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| 227 | { |
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| 228 | if (temp_mem) Free(temp_mem); |
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| 229 | return read_len ? read_len : res; |
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| 230 | } |
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| 231 | file_data->position += res; |
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| 232 | read_len += res; |
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| 233 | if (res < (size / MENUET_FILE_BLOCK_SIZE) * MENUET_FILE_BLOCK_SIZE) |
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| 234 | { |
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| 235 | if (temp_mem) Free(temp_mem); |
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| 236 | return read_len; |
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| 237 | } |
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| 238 | mem = (char*)mem + res; |
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| 239 | size -= res; |
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| 240 | } |
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| 241 | if (size) |
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| 242 | { |
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| 243 | res = _FileBufferSystem(file_data, temp_mem); |
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| 244 | if (res < 0) |
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| 245 | { |
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| 246 | if (temp_mem) Free(temp_mem); |
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| 247 | return read_len ? read_len : res; |
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| 248 | } |
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| 249 | read_len += _FileReadBuffer(file_data, mem, size, temp_mem); |
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| 250 | } |
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| 251 | if (temp_mem) Free(temp_mem); |
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| 252 | return read_len; |
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| 253 | } |
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| 254 | |||
| 255 | // Inline functions. |
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| 256 | |||
| 257 | inline unsigned int FileGetLength(TFileData file_data) |
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| 258 | { |
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| 259 | if (!file_data) return -1; |
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| 260 | if (file_data->length == -1) FileTestRead(file_data); |
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| 261 | return file_data->length; |
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| 262 | } |
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| 263 | } |
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| 264 | |||
| 265 | #else // def __MENUET__ |
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| 266 | |||
| 267 | namespace Menuet |
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| 268 | { |
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| 269 | struct _FileDataStruct |
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| 270 | { |
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| 271 | unsigned int data; |
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| 272 | }; |
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| 273 | } |
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| 274 | |||
| 275 | #endif // else: def __MENUET__ |
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| 276 | |||
| 277 | #endif // ndef __MENUET_FILE_H_INCLUDED_ |
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| 278 |