forked from KolibriOS/kolibrios
279 lines
7.5 KiB
C++
279 lines
7.5 KiB
C++
#ifndef __KOLIBRI_FILE_H_INCLUDED_
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#define __KOLIBRI_FILE_H_INCLUDED_
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#include "kolibri.h"
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#include "kos_heap.h"
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// Kolibri file interface.
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namespace Kolibri // All kolibri functions, types and data are nested in the (Kolibri) namespace.
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{
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struct _FileDataStruct;
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typedef _FileDataStruct *TFileData;
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TFileData FileOpen(const char *name, unsigned int buffer_length = 1024);
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int FileClose(TFileData file_data);
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bool FileEof(TFileData file_data);
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unsigned int FileGetPosition(TFileData file_data);
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void FileSetPosition(TFileData file_data, unsigned int pos);
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void FileReset(TFileData file_data);
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unsigned int FileGetLength(TFileData file_data);
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int FileTestRead(TFileData file_data);
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int FileRead(TFileData file_data, void *mem, int size);
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}
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#ifdef __KOLIBRI__
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namespace Kolibri
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{
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// Define the file data structure.
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struct _FileDataStruct
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{
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unsigned int length;
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unsigned int position;
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unsigned int *buffer;
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unsigned int access_param[5];
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enum {PosName = (unsigned int)(((_FileDataStruct*)0)->access_param + 5)};
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};
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// Inline functions.
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inline bool FileEof(TFileData file_data)
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{
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return file_data && file_data->position >= file_data->length;
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}
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inline unsigned int FileGetPosition(TFileData file_data)
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{
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return file_data ? file_data->position : 0;
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}
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inline void FileReset(TFileData file_data)
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{
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if (!file_data) return;
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file_data->length = -1;
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file_data->position = 0;
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if (file_data->buffer) file_data->buffer[1] = 0;
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}
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// Functions.
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int _FileAccess(void *file_access_param);
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TFileData FileOpen(const char *name, unsigned int buffer_length)
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{
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if (!name || !name[0]) return 0;
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unsigned int name_len = StrLen(name) + 1;
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unsigned int data_len = (_FileDataStruct::PosName + name_len + 3) & ~3;
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buffer_length = (buffer_length / KOLIBRI_FILE_BLOCK_SIZE) * KOLIBRI_FILE_BLOCK_SIZE;
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if (buffer_length) data_len += buffer_length + 2*sizeof(unsigned int);
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TFileData file = (TFileData)Alloc(_FileDataStruct::PosName + data_len);
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if (!file) return 0;
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file->length = -1;
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file->position = 0;
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if (buffer_length)
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{
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file->buffer = (unsigned int*)((char*)file + data_len) - 2;
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file->buffer[0] = buffer_length;
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file->buffer[1] = 0;
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}
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MemCopy(file->access_param + 5, name, name_len);
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unsigned int attr[40/4];
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file->access_param[0] = 5;
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file->access_param[1] = 0;
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file->access_param[2] = 0;
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file->access_param[3] = 0;
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file->access_param[4] = (int)attr;
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_FileAccess(file->access_param);
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file->length = attr[32/4];
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return file;
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}
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int FileClose(TFileData file_data)
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{
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if (!file_data) return -1;
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Free(file_data);
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return 0;
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}
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void FileSetPosition(TFileData file_data, unsigned int pos)
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{
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if (!file_data) return;
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if (file_data->buffer && file_data->buffer[1])
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{
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if (pos >= file_data->position && pos < file_data->position + file_data->buffer[1])
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{
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file_data->buffer[1] -= pos - file_data->position;
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}
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else file_data->buffer[1] = 0;
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}
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file_data->position = pos;
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}
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int _FileReadBuffer(TFileData file_data, void *mem, int size, void *temp_mem = 0)
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{
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unsigned int *buffer;
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if (!file_data || !mem || size <= 0) return -1;
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if (file_data->buffer) buffer = file_data->buffer;
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else if (temp_mem)
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{
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buffer = (unsigned int*)((char*)temp_mem + KOLIBRI_FILE_BLOCK_SIZE);
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}
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else return 0;
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if (!buffer[1]) return 0;
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if (file_data->position >= file_data->length)
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{
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buffer[1] = 0;
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return 0;
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}
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unsigned int buf_size = file_data->length - file_data->position;
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if (buf_size > buffer[1]) buf_size = buffer[1];
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if ((unsigned int)size >= buf_size) size = buf_size;
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MemCopy(mem, (char*)buffer - buffer[1], size);
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file_data->position += size;
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if ((unsigned int)size >= buf_size) buffer[1] = 0;
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else buffer[1] -= size;
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return size;
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}
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int _FileReadSystem(TFileData file_data, void *mem, int size)
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{
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int res;
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unsigned int len0, len1;
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size /= KOLIBRI_FILE_BLOCK_SIZE;
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if (!file_data || !mem || size <= 0) return -1;
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file_data->access_param[0] = 0;
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file_data->access_param[1] = (file_data->position / KOLIBRI_FILE_BLOCK_SIZE) * KOLIBRI_FILE_BLOCK_SIZE;
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file_data->access_param[2] = 0;
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file_data->access_param[3] = size * KOLIBRI_FILE_BLOCK_SIZE;
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file_data->access_param[4] = (unsigned int)mem;
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res = _FileAccess(file_data->access_param);
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if (res != 0 && res != 6) return (res & 255) - 1024;
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if (file_data->length <= file_data->position) return 0;
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len0 = file_data->length - file_data->position;
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len1 = size * KOLIBRI_FILE_BLOCK_SIZE - (file_data->position % KOLIBRI_FILE_BLOCK_SIZE);
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return (len0 <= len1) ? len0 : len1;
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}
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int _FileBufferSystem(TFileData file_data, void *&temp_mem)
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{
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int res;
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unsigned int *buffer;
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if (!file_data) return -1;
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if (file_data->buffer) buffer = file_data->buffer;
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else
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{
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if (!temp_mem)
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{
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temp_mem = Alloc(KOLIBRI_FILE_BLOCK_SIZE + 2*sizeof(unsigned int));
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if (!temp_mem) return -10;
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}
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buffer = (unsigned int*)((char*)temp_mem + KOLIBRI_FILE_BLOCK_SIZE);
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buffer[0] = KOLIBRI_FILE_BLOCK_SIZE;
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}
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buffer[1] = buffer[0];
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res = _FileReadSystem(file_data, (char*)buffer - buffer[1], buffer[1]);
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if (res < 0) buffer[1] = 0;
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else buffer[1] -= file_data->position % KOLIBRI_FILE_BLOCK_SIZE;
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return res;
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}
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int FileTestRead(TFileData file_data)
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{
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int res;
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void *temp_mem = 0;
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if (!file_data) return -1;
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if (file_data->buffer && file_data->buffer[1]) return 0;
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res = _FileBufferSystem(file_data, temp_mem);
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if (temp_mem) Free(temp_mem);
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return (res < 0) ? res : 0;
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}
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int FileRead(TFileData file_data, void *mem, int size)
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{
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int tlen, res, read_len;
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void *temp_mem = 0;
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res = _FileReadBuffer(file_data, mem, size);
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if (res < 0 || res >= size) return res;
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read_len = res;
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mem = (char*)mem + res;
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size -= res;
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tlen = file_data->position % KOLIBRI_FILE_BLOCK_SIZE;
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if (tlen)
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{
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res = _FileBufferSystem(file_data, temp_mem);
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if (res < 0)
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{
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if (temp_mem) Free(temp_mem);
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return read_len ? read_len : res;
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}
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res = _FileReadBuffer(file_data, mem, size);
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read_len += res;
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if (res >= size || file_data->length <= file_data->position ||
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file_data->length - file_data->position <= res)
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{
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if (temp_mem) Free(temp_mem);
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return read_len;
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}
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mem = (char*)mem + res;
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size -= res;
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}
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if (size >= (file_data->buffer ? file_data->buffer[0] : KOLIBRI_FILE_BLOCK_SIZE))
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{
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res = _FileReadSystem(file_data, mem, size);
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if (res < 0)
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{
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if (temp_mem) Free(temp_mem);
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return read_len ? read_len : res;
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}
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file_data->position += res;
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read_len += res;
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if (res < (size / KOLIBRI_FILE_BLOCK_SIZE) * KOLIBRI_FILE_BLOCK_SIZE)
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{
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if (temp_mem) Free(temp_mem);
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return read_len;
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}
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mem = (char*)mem + res;
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size -= res;
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}
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if (size)
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{
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res = _FileBufferSystem(file_data, temp_mem);
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if (res < 0)
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{
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if (temp_mem) Free(temp_mem);
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return read_len ? read_len : res;
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}
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read_len += _FileReadBuffer(file_data, mem, size, temp_mem);
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}
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if (temp_mem) Free(temp_mem);
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return read_len;
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}
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// Inline functions.
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inline unsigned int FileGetLength(TFileData file_data)
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{
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if (!file_data) return -1;
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if (file_data->length == -1) FileTestRead(file_data);
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return file_data->length;
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}
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}
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#else // def __KOLIBRI__
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namespace Kolibri
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{
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struct _FileDataStruct
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{
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unsigned int data;
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};
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}
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#endif // else: def __KOLIBRI__
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#endif // ndef __KOLIBRI_FILE_H_INCLUDED_
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