Add fast seek support to file objects
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3d07571029
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a393a6e0c5
@ -197,6 +197,23 @@ STATIC mp_obj_t file_open(fs_user_mount_t *vfs, const mp_obj_type_t *type, mp_ar
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m_del_obj(pyb_file_obj_t, o);
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mp_raise_OSError(fresult_to_errno_table[res]);
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}
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// If we're reading, turn on fast seek.
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if (mode == FA_READ) {
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// one call to determine how much space we need.
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DWORD temp_table[2];
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temp_table[0] = 2;
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o->fp.cltbl = temp_table;
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f_lseek(&o->fp, CREATE_LINKMAP);
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DWORD size = (temp_table[0] + 1) * 2;
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o->fp.cltbl = m_malloc_maybe(size, false);
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if (o->fp.cltbl != NULL) {
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o->fp.cltbl[0] = size;
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res = f_lseek(&o->fp, CREATE_LINKMAP);
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if (res != FR_OK) {
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o->fp.cltbl = NULL;
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}
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}
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}
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// for 'a' mode, we must begin at the end of the file
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if ((mode & FA_OPEN_ALWAYS) != 0) {
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@ -74,7 +74,7 @@
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/* This option switches f_mkfs() function. (0:Disable or 1:Enable) */
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#define _USE_FASTSEEK 0
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#define _USE_FASTSEEK 1
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/* This option switches fast seek function. (0:Disable or 1:Enable) */
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