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cmap [2020/02/23 11:17] christian [Monster from the wild] |
cmap [2020/02/23 14:26] christian [Char to string mapping] |
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| ===== Monster from the wild ===== | ===== Monster from the wild ===== | ||
| + | CMaps are not well defined. Therefore, there are some interesting variations of them in the wild. Here is a small selection of some issues. | ||
| + | ==== Codespace problems ==== | ||
| - | ==== Mappings outside the codespace ==== | + | === Wrong code length |
| - | single byte mappings in a double byte codespace | + | <code postscript> |
| + | %... | ||
| + | 1 begincodespacerange | ||
| + | < | ||
| + | endcodespacerange | ||
| + | 27 beginbfchar | ||
| + | <20> < | ||
| + | <2E> < | ||
| + | <43> < | ||
| + | <44> < | ||
| + | <45> < | ||
| + | %... | ||
| + | </ | ||
| - | ==== Wrong PostScript ==== | + | Here are single byte mappings in a double byte codespace which is not correct according to the documentation. |
| - | using /find instead | + | This can be seen often. These illegal mappings are collected into the ''# |
| + | |||
| + | === Mappings outside the codespace === | ||
| + | |||
| + | <code postscript> | ||
| + | %... | ||
| + | 1 begincodespacerange | ||
| + | < | ||
| + | endcodespacerange | ||
| + | 11 beginbfchar | ||
| + | < | ||
| + | < | ||
| + | < | ||
| + | < | ||
| + | < | ||
| + | %... | ||
| + | </code> | ||
| + | |||
| + | Here, only the first mapping matches the code space. All others fall outside of it, because the second byte has to be between <00> and < | ||
| + | |||
| + | ==== Wrong PostScript ==== | ||
| - | See [[postscript# | + | On one occasion, I saw a CMap where the PostScript used a non-existing operator (''/ |
| ==== Prevent copying ==== | ==== Prevent copying ==== | ||
| Line 182: | Line 216: | ||
| </ | </ | ||
| - | It looks as if two codes (<24> and <50>) are mapped to a string of 2-byte characters. | + | Two codes (<24> and <50>) are mapped to a string of 2-byte characters. |
| + | |||
| + | Seen in a PDF with the '' | ||