a788e03c7b
This current implementation does not cover the following:
* Setting correct breakpoint when exiting loop
* Setting correct breakpoint when returning from function
* All facilities are available for this, it just is not taken into
account in the current `next` implementation.
103 lines
1.5 KiB
Go
103 lines
1.5 KiB
Go
package util
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import (
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"bytes"
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"unicode/utf8"
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)
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// DecodeULEB128 decodes an unsigned Little Endian Base 128
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// represented number.
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func DecodeULEB128(buf *bytes.Buffer) (uint64, uint32) {
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var (
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result uint64
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shift uint64
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length uint32
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)
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for {
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b, err := buf.ReadByte()
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if err != nil {
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panic("Could not parse ULEB128 value")
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}
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length++
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result |= uint64((uint(b) & 0x7f) << shift)
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// If high order bit is 1.
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if b&0x80 == 0 {
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break
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}
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shift += 7
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}
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return result, length
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}
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// DecodeSLEB128 decodes an signed Little Endian Base 128
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// represented number.
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func DecodeSLEB128(buf *bytes.Buffer) (int64, uint32) {
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var (
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b byte
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err error
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result int64
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shift uint64
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length uint32
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)
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for {
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b, err = buf.ReadByte()
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if err != nil {
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panic("Could not parse SLEB128 value")
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}
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length++
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result |= int64((int64(b) & 0x7f) << shift)
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shift += 7
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if b&0x80 == 0 {
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break
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}
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}
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if (shift < 8*uint64(length)) && (b&0x40 > 0) {
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result |= -(1 << shift)
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}
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return result, length
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}
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func ParseString(data *bytes.Buffer) (string, uint32) {
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var (
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size uint32
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str []rune
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strb []byte
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)
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for {
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b, err := data.ReadByte()
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if err != nil {
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panic("parseString(): Could not read byte")
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}
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size++
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if b == 0x0 {
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if size == 1 {
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return "", size
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}
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break
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}
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strb = append(strb, b)
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if utf8.FullRune(strb) {
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r, _ := utf8.DecodeRune(strb)
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str = append(str, r)
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size++
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strb = strb[0:0]
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}
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}
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return string(str), size
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}
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