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== Position and Length == | == Position and Length == | ||
− | Position in binary variables is 1-based, where the first byte value in a binary variable is position 1. This is different than the position used by /bread | + | Position in binary variables is 1-based, where the first byte value in a binary variable is position 1. This is different than the position used by /bread amd /bwrite to read/write binary variables to disk files, where file position 0 is the position for reading/writing the first byte of the file. |
If a binary variable has length N, position N is the last byte of the variable. Because appending to a binary variable requires calculating and writing to position N+1, several of the binary commands allow using position -1 to append to a variable. Also, instead of using $bvar to find the length of a variable, some of them also allow -1 in the length parameter for writing the entire variable. | If a binary variable has length N, position N is the last byte of the variable. Because appending to a binary variable requires calculating and writing to position N+1, several of the binary commands allow using position -1 to append to a variable. Also, instead of using $bvar to find the length of a variable, some of them also allow -1 in the length parameter for writing the entire variable. |