fix: amend string bondary bugs in gitleaks-original-encoded-secrets

[eliranmal]

• fix counting error in column bounding markers: for some reason in gitleaks reports they're off by 1
• omit keepends=True when splitting lines; multiline is gonna be supported via counting (see next item)
• account for multiple lines in found secrets when calculating column-end marker, by subtracting the column-start marker if the secret spans multiple lines in the original repo

[bplaxco]

@eliranmal thanks for the PR!

Hmm it looks like when I have a secret file that looks like this in a repo:

ZFhObGNsOXpaV055WlhROUlrZHlWMVJ0TldzeWFuUlhlVGxEWlU5V1lrOXFiRkpGZEMweE1FNXRjR1ZRUmt0NGRqUkdiV3c0T1ZsTWQyNHdNREpyUmpGamVUUk1VVEZqV0hNNVpESlFSM2d6TjNwUFZWQlJhekY1Vm1sTmFHaEpaRWhzYUhjaUNnPT0=

I see some errors with the output:

~ $ ./updated-version test-repo test.json 
[
  "="
]
~ $ gitleaks-original-encoded-secrets test-repo test.json 
[
  "ZFhObGNsOXpaV055WlhROUlrZHlWMVJ0TldzeWFuUlhlVGxEWlU5V1lrOXFiRkpGZEMweE1FNXRjR1ZRUmt0NGRqUkdiV3c0T1ZsTWQyNHdNREpyUmpGamVUUk1VVEZqV0hNNVpESlFSM2d6TjNwUFZWQlJhekY1Vm1sTmFHaEpaRWhzYUhjaUNnPT0="
]

Were you potentially running on a Windows machine or working with something with windows newlines in the file?

If so, I think I know a fix 👌 (Yeah for some reason gitleaks captures the newline split at the beginning of the line. If that's it, I think I have an idea for a fix ^_^

[eliranmal]

@bplaxco

Hmm it looks like when I have a secret file that looks like this in a repo [...] I see some errors with the output

oh no!

i was apparently testing on a repo that doesn't seem to have enough test-cases to properly check all scenarios, so i don't have more ideas on how to fix that..

Were you potentially running on a Windows machine or working with something with windows newlines in the file?

no - i'm running macos (V 15.5).

If so, I think I know a fix 👌 (Yeah for some reason gitleaks captures the newline split at the beginning of the line. If that's it, I think I have an idea for a fix ^_^

okay, lemme know if i can offer any help testing/reproducing etc.