Add ryfs_get_size
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@ -61,6 +61,7 @@ ryfs_open: jmp [0xF0045008]
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ryfs_seek: jmp [0xF004500C]
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ryfs_read: jmp [0xF0045010]
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ryfs_read_whole_file: jmp [0xF0045014]
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ryfs_get_size: jmp [0xF0045018]
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; memory copy/compare jump table
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copy_memory_bytes: jmp [0xF0046000]
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1
main.asm
1
main.asm
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@ -208,6 +208,7 @@ get_rom_version:
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data.32 ryfs_seek
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data.32 ryfs_read
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data.32 ryfs_read_whole_file
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data.32 ryfs_get_size
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; memory copy/compare jump table
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org.pad 0xF0046000
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50
ryfs.asm
50
ryfs.asm
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@ -267,3 +267,53 @@ ryfs_read_whole_file_last_sector:
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pop r1
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pop r0
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ret
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; get the exact size of a file
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; inputs:
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; r0: pointer to file struct
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; outputs:
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; r0: file size in bytes
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ryfs_get_size:
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push r1
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push r2
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push r10
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push r11
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mov r10, r0
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mov r11, 0 ; byte counter
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; read the first sector into the temp buffer
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movz.8 r1, [r0] ; file_disk
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inc r0
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movz.16 r0, [r0] ; file_first_sector
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ryfs_get_size_sector_loop:
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mov r2, TEMP_SECTOR_BUF
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call read_sector
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; check to see if this is the last sector
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; if this is the last sector, read the sector size field in the header
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mov r0, TEMP_SECTOR_BUF
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add r0, 2
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cmp.16 [r0], 0
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ifz jmp ryfs_get_size_last_sector
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; there are more sectors left, load them
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movz.16 r0, [r0] ; sector number
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mov r1, [r10] ; file_disk
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add r11, 506
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jmp ryfs_get_size_sector_loop
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ryfs_get_size_last_sector:
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; this is the last sector, read the header to get the reamining number of bytes
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mov r0, TEMP_SECTOR_BUF
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add r0, 4
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movz.16 r0, [r0]
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add r11, r0
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; return final size
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mov r0, r11
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pop r11
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pop r10
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pop r2
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pop r1
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ret
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