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Package content lexes and walks PDF content streams.

Package corpus builds the Byblos test corpus in memory.

Package glyphless is a minimal TrueType font whose glyphs carry no outlines: every character prints nothing, but still occupies exactly as much horizontal space as a normal proportional glyph would.

Package jbig2 implements a lossless JBIG2 codec: generic regions in both directions, and symbol mode for reading.

Package linearize implements ISO 32000-1:2008 Annex F linearization: the object partition, the two cross-reference sections, the linearization parameter dictionary and the primary hint stream.

Package pdfbuild constructs a PDF from already-encoded page images.

Package pdfdoc is the only package in Byblos that imports pdfcpu.

Package sample walks a directory of PDF documents and reports the POPULATION that a rate measured over that directory is a rate of.

Package skew estimates the angle of the text lines INSIDE a raster.