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Copy pathscan.go
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scan.go
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package main
import (
"fmt"
"math"
"time"
)
func scanEpoch(value string, epoch time.Time) time.Time {
parsed_time, parse_error := time.Parse("1/2/2006", value)
if parse_error != nil {
return epoch
}
return parsed_time
}
func scanOffset(value string, file_pos int) int {
var err error
expression := ""
scanned_file_pos := 0
if n, _ := fmt.Sscanf(value, "+%s", &expression); n > 0 {
if scanned_file_pos, err = evaluateExpression(expression); err == nil {
return file_pos + scanned_file_pos
}
return -1
}
if scanned_file_pos, err = evaluateExpression(value); err == nil {
if scanned_file_pos < 0 {
if scanned_file_pos+file_pos < 0 {
return 0
}
return scanned_file_pos + file_pos
}
return scanned_file_pos
}
return -1
}
func scanSearchString(value string, bytes []byte, cursor Cursor, quit <-chan bool, progress chan<- int) *Cursor {
representations := make(map[string]*Cursor)
var scanned_fp float64
var rest_of_value string
if n, _ := fmt.Sscanf(value, "%g%s", &scanned_fp, &rest_of_value); n > 0 && len(rest_of_value) == 0 {
fp32_string := binaryStringForInteger32(math.Float32bits(float32(scanned_fp)), cursor.big_endian)
fp32_cursor := Cursor{mode: FloatingPointMode, fp_length: 4, big_endian: cursor.big_endian}
representations[fp32_string] = &fp32_cursor
fp64_string := binaryStringForInteger64(math.Float64bits(scanned_fp), cursor.big_endian)
fp64_cursor := Cursor{mode: FloatingPointMode, fp_length: 8, big_endian: cursor.big_endian}
representations[fp64_string] = &fp64_cursor
var scanned_int int64
if n, _ := fmt.Sscanf(value, "%d%s", &scanned_int, &rest_of_value); n > 0 && scanned_fp == float64(scanned_int) && len(rest_of_value) == 0 {
if scanned_int >= math.MinInt8 && scanned_int <= math.MaxUint8 {
int8_string := binaryStringForInteger8(uint8(scanned_int))
int8_cursor := Cursor{mode: IntegerMode, int_length: 1, unsigned: (scanned_int > math.MaxInt8)}
representations[int8_string] = &int8_cursor
}
if scanned_int >= math.MinInt16 && scanned_int <= math.MaxUint16 {
int16_string := binaryStringForInteger16(uint16(scanned_int), cursor.big_endian)
int16_cursor := Cursor{mode: IntegerMode, int_length: 2, unsigned: (scanned_int > math.MaxInt16),
big_endian: cursor.big_endian}
representations[int16_string] = &int16_cursor
}
if scanned_int >= math.MinInt32 && scanned_int <= math.MaxUint32 {
int32_string := binaryStringForInteger32(uint32(scanned_int), cursor.big_endian)
int32_cursor := Cursor{mode: IntegerMode, int_length: 4, unsigned: (scanned_int > math.MaxInt32),
big_endian: cursor.big_endian}
representations[int32_string] = &int32_cursor
}
int64_string := binaryStringForInteger64(uint64(scanned_int), cursor.big_endian)
int64_cursor := Cursor{mode: IntegerMode, int_length: 8, unsigned: (scanned_int > math.MaxInt64),
big_endian: cursor.big_endian}
representations[int64_string] = &int64_cursor
}
}
text_cursor := Cursor{mode: StringMode}
representations[value] = &text_cursor
first_match := -1
first_length := 1
first_cursor := cursor
for k, v := range representations {
start_pos := cursor.pos + 1
found_pos := -1
if start_pos < len(bytes) {
found_pos = interruptibleSearch(bytes[start_pos:], k, quit, progress)
if found_pos >= 0 {
found_pos += start_pos
}
}
if found_pos == -1 {
found_pos = interruptibleSearch(bytes[0:cursor.pos], k, quit, progress)
}
if found_pos == -2 {
return nil
}
v.pos = found_pos
}
found_match := false
for _, v := range representations {
if v.pos != -1 {
found_match = true
ranked_pos := v.pos - cursor.pos
if ranked_pos < 0 {
ranked_pos += len(bytes)
}
if first_match == -1 || ranked_pos < first_match ||
(ranked_pos == first_match && v.length() > first_length) {
first_match = ranked_pos
first_length = v.length()
first_cursor.pos = v.pos
if v.mode == FloatingPointMode {
first_cursor.fp_length = v.fp_length
} else if v.mode == IntegerMode {
first_cursor.int_length = v.int_length
}
first_cursor.mode = v.mode
first_cursor.unsigned = v.unsigned
}
}
}
if !found_match {
return nil
}
return &first_cursor
}
func scanEditedContent(value string, cursor Cursor) (string, string) {
if len(value) == 0 {
return "", ""
}
result, rest_of_value := value, ""
if cursor.mode == IntegerMode {
var scanned_int int64
if n, _ := fmt.Sscanf(value, "%d%s", &scanned_int, &rest_of_value); n < 1 {
return "", value
}
if cursor.int_length == 1 {
if cursor.unsigned {
result = binaryStringForInteger8(uint8(scanned_int))
} else {
result = binaryStringForInteger8(uint8(scanned_int))
}
} else if cursor.int_length == 2 {
if cursor.unsigned {
result = binaryStringForInteger16(uint16(scanned_int), cursor.big_endian)
} else {
result = binaryStringForInteger16(uint16(scanned_int), cursor.big_endian)
}
} else if cursor.int_length == 4 {
if cursor.unsigned {
result = binaryStringForInteger32(uint32(scanned_int), cursor.big_endian)
} else {
result = binaryStringForInteger32(uint32(scanned_int), cursor.big_endian)
}
} else if cursor.int_length == 8 {
if cursor.unsigned {
result = binaryStringForInteger64(uint64(scanned_int), cursor.big_endian)
} else {
result = binaryStringForInteger64(uint64(scanned_int), cursor.big_endian)
}
}
} else if cursor.mode == FloatingPointMode {
var scanned_fp float64
if n, _ := fmt.Sscanf(value, "%g%s", &scanned_fp, &rest_of_value); n < 1 {
return "", value
}
if cursor.fp_length == 4 {
result = binaryStringForInteger32(math.Float32bits(float32(scanned_fp)), cursor.big_endian)
} else if cursor.fp_length == 8 {
result = binaryStringForInteger64(math.Float64bits(scanned_fp), cursor.big_endian)
}
} else if cursor.mode == BitPatternMode {
var scanned_int int64
scan_fmt := "%" + string('0'+(cursor.bit_length*2)) + "x%s"
if n, _ := fmt.Sscanf(value, scan_fmt, &scanned_int, &rest_of_value); n < 1 {
return "", value
}
if cursor.bit_length == 1 {
result = binaryStringForInteger8(uint8(scanned_int))
} else if cursor.bit_length == 2 {
result = binaryStringForInteger16(uint16(scanned_int), true)
}
}
return result, rest_of_value
}