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Implement mvhd_format_sectors

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shermp
2019-06-13 22:24:05 +12:00
parent fe03cc7dc2
commit e16d1cb414
2 changed files with 23 additions and 3 deletions
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5
src/minivhd_internal.h
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@@ -82,7 +82,10 @@ struct MVHDMeta {
MVHDSectorBitmap bitmap;
int (*read_sectors)(MVHDMeta*, int, int, void*);
int (*write_sectors)(MVHDMeta*, int, int, void*);
int (*format_sectors)(MVHDMeta*, int, int);
struct {
uint8_t* zero_data;
int sector_count;
} format_buffer;
};
#endif

21
src/minivhd_manage.c
View File

@@ -335,8 +335,13 @@ MVHDMeta* mvhd_open(const char* path, bool readonly, int* err) {
goto cleanup_bitmap;
}
mvhd_assign_io_funcs(vhdm);
vhdm->format_buffer.zero_data = calloc(64, MVHD_SECTOR_SIZE);
vhdm->format_buffer.sector_count = 64;
/* If we've reached this point, we are good to go, so skip the cleanup steps */
goto end;
cleanup_format_buff:
free(vhdm->format_buffer.zero_data);
vhdm->format_buffer.zero_data = NULL;
cleanup_bitmap:
free(vhdm->bitmap.curr_bitmap);
vhdm->bitmap.curr_bitmap = NULL;
@@ -371,6 +376,10 @@ void mvhd_close(MVHDMeta* vhdm) {
free(vhdm->bitmap.curr_bitmap);
vhdm->bitmap.curr_bitmap = NULL;
}
if (vhdm->format_buffer.zero_data != NULL) {
free(vhdm->format_buffer.zero_data);
vhdm->format_buffer.zero_data = NULL;
}
free(vhdm);
vhdm = NULL;
}
@@ -410,7 +419,9 @@ int mvhd_write_sectors(MVHDMeta* vhdm, int offset, int num_sectors, void* in_buf
/**
* \brief Write zeroed sectors to VHD file
*
* Write num_sectors, beginning at offset, of zero data into the VHD file
* Write num_sectors, beginning at offset, of zero data into the VHD file.
* We reuse the existing write functions, with a preallocated zero buffer as
* our source buffer.
*
* \param [in] vhdm MiniVHD data structure
* \param [in] offset the sector offset from which to start writing to
@@ -419,5 +430,11 @@ int mvhd_write_sectors(MVHDMeta* vhdm, int offset, int num_sectors, void* in_buf
* \return the number of sectors that were not written, or zero
*/
int mvhd_format_sectors(MVHDMeta* vhdm, int offset, int num_sectors) {
return vhdm->format_sectors(vhdm, offset, num_sectors);
int num_full = num_sectors / vhdm->format_buffer.sector_count;
int remain = num_sectors % vhdm->format_buffer.sector_count;
for (int i = 0; i < num_full; i++) {
vhdm->write_sectors(vhdm, offset, vhdm->format_buffer.sector_count, vhdm->format_buffer.zero_data);
}
vhdm->write_sectors(vhdm, offset, remain, vhdm->format_buffer.zero_data);
return 0;
}