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100 lines
2.5 KiB
100 lines
2.5 KiB
#!/bin/sh |
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# |
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# Support routines for hand-crafting weird or malicious packs. |
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# |
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# You can make a complete pack like: |
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# |
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# pack_header 2 >foo.pack && |
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# pack_obj e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 >>foo.pack && |
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# pack_obj e68fe8129b546b101aee9510c5328e7f21ca1d18 >>foo.pack && |
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# pack_trailer foo.pack |
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# Print the big-endian 4-byte octal representation of $1 |
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uint32_octal () { |
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n=$1 |
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printf '\\%o' $(($n / 16777216)); n=$((n % 16777216)) |
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printf '\\%o' $(($n / 65536)); n=$((n % 65536)) |
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printf '\\%o' $(($n / 256)); n=$((n % 256)) |
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printf '\\%o' $(($n )); |
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} |
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# Print the big-endian 4-byte binary representation of $1 |
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uint32_binary () { |
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printf "$(uint32_octal "$1")" |
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} |
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# Print a pack header, version 2, for a pack with $1 objects |
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pack_header () { |
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printf 'PACK' && |
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printf '\0\0\0\2' && |
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uint32_binary "$1" |
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} |
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# Print the pack data for object $1, as a delta against object $2 (or as a full |
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# object if $2 is missing or empty). The output is suitable for including |
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# directly in the packfile, and represents the entirety of the object entry. |
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# Doing this on the fly (especially picking your deltas) is quite tricky, so we |
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# have hardcoded some well-known objects. See the case statements below for the |
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# complete list. |
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pack_obj () { |
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case "$1" in |
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# empty blob |
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e69de29bb2d1d6434b8b29ae775ad8c2e48c5391) |
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case "$2" in |
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'') |
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printf '\060\170\234\003\0\0\0\0\1' |
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return |
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;; |
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esac |
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;; |
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# blob containing "\7\76" |
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e68fe8129b546b101aee9510c5328e7f21ca1d18) |
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case "$2" in |
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'') |
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printf '\062\170\234\143\267\3\0\0\116\0\106' |
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return |
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;; |
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01d7713666f4de822776c7622c10f1b07de280dc) |
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printf '\165\1\327\161\66\146\364\336\202\47\166' && |
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printf '\307\142\54\20\361\260\175\342\200\334\170' && |
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printf '\234\143\142\142\142\267\003\0\0\151\0\114' |
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return |
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;; |
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esac |
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;; |
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# blob containing "\7\0" |
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01d7713666f4de822776c7622c10f1b07de280dc) |
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case "$2" in |
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'') |
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printf '\062\170\234\143\147\0\0\0\20\0\10' |
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return |
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;; |
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e68fe8129b546b101aee9510c5328e7f21ca1d18) |
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printf '\165\346\217\350\22\233\124\153\20\32\356' && |
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printf '\225\20\305\62\216\177\41\312\35\30\170\234' && |
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printf '\143\142\142\142\147\0\0\0\53\0\16' |
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return |
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;; |
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esac |
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;; |
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esac |
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echo >&2 "BUG: don't know how to print $1${2:+ (from $2)}" |
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return 1 |
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} |
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# Compute and append pack trailer to "$1" |
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pack_trailer () { |
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test-sha1 -b <"$1" >trailer.tmp && |
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cat trailer.tmp >>"$1" && |
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rm -f trailer.tmp |
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} |
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# Remove any existing packs to make sure that |
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# whatever we index next will be the pack that we |
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# actually use. |
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clear_packs () { |
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rm -f .git/objects/pack/* |
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}
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