mirror of
https://github.com/JetSetIlly/Gopher2600.git
synced 2024-06-23 15:03:14 -04:00
136 lines
3.5 KiB
Go
136 lines
3.5 KiB
Go
// This file is part of Gopher2600.
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//
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// Gopher2600 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Gopher2600 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
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//
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// *** NOTE: all historical versions of this file, as found in any
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// git repository, are also covered by the licence, even when this
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// notice is not present ***
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package patch
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import (
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"strconv"
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"strings"
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"unicode"
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"github.com/jetsetilly/gopher2600/errors"
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"github.com/jetsetilly/gopher2600/hardware/memory/cartridge"
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"github.com/jetsetilly/gopher2600/paths"
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)
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const patchPath = "patches"
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const commentLeader = '-'
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const pokeLineSeparator = ":"
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// CartridgeMemory applies the contents of a patch file to cartridge memory.
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// Currently, patch file must be in the patches sub-directory of the
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// resource path (see paths package).
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func CartridgeMemory(mem *cartridge.Cartridge, patchFile string) (bool, error) {
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var err error
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p, err := paths.ResourcePath(patchPath, patchFile)
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if err != nil {
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return false, errors.New(errors.PatchError, err)
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}
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f, err := os.Open(p)
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if err != nil {
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switch err.(type) {
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case *os.PathError:
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return false, errors.New(errors.PatchError, fmt.Sprintf("patch file not found (%s)", p))
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}
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return false, errors.New(errors.PatchError, err)
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}
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defer f.Close()
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// make sure we're at the beginning of the file
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if _, err = f.Seek(0, io.SeekStart); err != nil {
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return false, err
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}
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buffer, err := ioutil.ReadAll(f)
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// once a patch has been made then we'll flip patched to true and return it
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// to the calling function
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patched := false
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// walk through lines
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lines := strings.Split(string(buffer), "\n")
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for i := 0; i < len(lines); i++ {
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// ignore empty lines
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if len(lines[i]) == 0 {
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continue // for loop
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}
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// ignoring comment lines and lines starting with whitespace
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if lines[i][0] == commentLeader || unicode.IsSpace(rune(lines[i][0])) {
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continue // for loop
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}
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pokeLine := strings.Split(lines[i], pokeLineSeparator)
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// ignore any lines that don't match the required [address: values...] format
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if len(pokeLine) != 2 {
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continue // for loop
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}
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// trim space around each poke line part
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pokeLine[0] = strings.TrimSpace(pokeLine[0])
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pokeLine[1] = strings.TrimSpace(pokeLine[1])
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// parse address
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address, err := strconv.ParseInt(pokeLine[0], 16, 16)
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if err != nil {
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continue // for loop
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}
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// split values into parts
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values := strings.Split(pokeLine[1], " ")
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for j := 0; j < len(values); j++ {
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// trim space around each value
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values[j] = strings.TrimSpace(values[j])
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// ignore empty fields
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if values[j] == "" {
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continue // inner for loop
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}
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// covert data
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v, err := strconv.ParseUint(values[j], 16, 8)
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if err != nil {
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continue // inner for loop
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}
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// patch memory
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err = mem.Patch(uint16(address), uint8(v))
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if err != nil {
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return patched, errors.New(errors.PatchError, err)
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}
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patched = true
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// advance address
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address++
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}
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}
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return patched, nil
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}
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