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module Spreadsheet
module Excel
class Reader
##
# This Module collects reader methods such as read_string that are specific to
# Biff5. This Module is likely to be expanded as Support for older Versions
# of Excel grows.
module Biff5
##
# Read a String of 8-bit Characters
def read_string work, count_length = 1
# Offset Size Contents
# 0 1 or 2 Length of the string (character count, ln)
# 1 or 2 ln Character array (8-bit characters)
fmt = (count_length == 1) ? "C" : "v"
length, = work.unpack fmt
work[count_length, length]
end
def read_range_address_list work, len
# Cell range address, BIFF2-BIFF5:
# Offset Size Contents
# 0 2 Index to first row
# 2 2 Index to last row
# 4 1 Index to first column
# 5 1 Index to last column
#
results = []
return results if len < 2
count = work[0..1].unpack1("v")
offset = 2
count.times do |i|
results << work[offset...offset + 6].unpack("v2c2")
offset += 6
end
results
end
end
end
end
end
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