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This further reduces the length and complexity of sendFile(), hopefully make it easier to understand and modify. In addition to moving some logic into a new function, I took this opportunity to make a few slight adjustments to sendFile() itself, including renaming the 'len' variable to 'bytes_done', since we use it to represent the number of bytes we've already handled so far, not the total length of the file. Patch by me, reviewed by David Steele. Discussion: http://postgr.es/m/CA+TgmoYt5jXH4U6cu1dm9Oe2FTn1aae6hBNhZzJJjyjbE_zYig@mail.gmail.com