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Use head and tail instead of dd

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Rien Maertens 2020-11-01 20:28:51 +01:00
parent 221aa0e7b3
commit 2e280f889d
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1 changed files with 2 additions and 2 deletions
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reStream.sh
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@ -116,7 +116,7 @@ case "$rm_version" in
# it is actually the map allocated _after_ the fb0 mmap
read_address="grep -C1 '/dev/fb0' /proc/$pid/maps | tail -n1 | sed 's/-.*$//'"
skip_bytes_hex="$(ssh_cmd "$read_address")"
skip_bytes="$((0x$skip_bytes_hex))"
skip_bytes="$((0x$skip_bytes_hex + 8))"
echo "framebuffer is at 0x$skip_bytes_hex"
# carve the framebuffer out of the process memory
@ -127,7 +127,7 @@ case "$rm_version" in
# Using dd with bs=1 is too slow, so we first carve out the pages our desired
# bytes are located in, and then we trim the resulting data with what we need.
head_fb0="dd if=/proc/$pid/mem bs=$page_size skip=$window_start_blocks count=$window_length_blocks 2>/dev/null | dd if=/dev/stdin skip=$window_offset bs=1 count=$window_bytes 2>/dev/null"
head_fb0="dd if=/proc/$pid/mem bs=$page_size skip=$window_start_blocks count=$window_length_blocks 2>/dev/null | tail -c+$window_offset | head -c $window_bytes"
;;
*)
echo "Unsupported reMarkable version: $rm_version."