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Try to support PDFs with weird spacing in Encrypt blob

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Some PDFs apparently use nonstandard spacing in the /Encrypt
blob which my parser didn't like. Hopefully this fixes it?
Related to #44
This commit is contained in:
Florian Bach 2022-12-13 22:16:51 +01:00
parent 4dfc7af7b8
commit c508280319
1 changed files with 9 additions and 2 deletions
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11
calibre-plugin/libpdf.py
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@ -128,9 +128,16 @@ def find_enc(filename_in):
for line in br.readlines(): for line in br.readlines():
i = i + 1 i = i + 1
if "R/Encrypt" in line and "R/ID" in line: is_encrypt_normal = "R/Encrypt" in line and "R/ID" in line
is_encrypt_odd = "R" in line and "/Encrypt" in line and "/ID" in line
if is_encrypt_normal or is_encrypt_odd:
find_enc_end = int(time.time() * 1000) find_enc_end = int(time.time() * 1000)
print("Found ENC after %d attempts - took %d ms" % (i, find_enc_end - find_enc_start)) print("Found ENC after %d attempts - took %d ms" % (i, find_enc_end - find_enc_start))
if is_encrypt_odd:
print("Odd formatting of encryption blob?")
print("If this doesn't work correctly please open a bug report.")
return line return line
find_enc_end = int(time.time() * 1000) find_enc_end = int(time.time() * 1000)
@ -186,7 +193,7 @@ def patch_drm_into_pdf(filename_in, adept_license_string, filename_out, ebx_book
line_split = encrypt.split(' ') line_split = encrypt.split(' ')
next = 0 next = 0
for element in line_split: for element in line_split:
if element == "R/Encrypt": if element == "R/Encrypt" or element == "/Encrypt":
next = 2 next = 2
continue continue
if next == 2: if next == 2: