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file.go
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file.go
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package nesasm
import (
"fmt"
"io"
"github.com/retroenv/nesgodisasm/internal/assembler"
"github.com/retroenv/nesgodisasm/internal/options"
"github.com/retroenv/nesgodisasm/internal/program"
"github.com/retroenv/nesgodisasm/internal/writer"
)
var headerByte = " .%s %d %-22s ; %s\n"
var vectors = " .dw %s, %s, %s\n\n"
// FileWriter writes the assembly file content.
type FileWriter struct {
app *program.Program
options *options.Disassembler
mainWriter io.Writer
newBankWriter assembler.NewBankWriter
writer *writer.Writer
}
type prgBankWrite struct {
bank *program.PRGBank
}
type customWrite func() error
type lineWrite string
// New creates a new file writer.
// nolint: ireturn
func New(app *program.Program, options *options.Disassembler, mainWriter io.Writer, newBankWriter assembler.NewBankWriter) writer.AssemblerWriter {
opts := writer.Options{
DirectivePrefix: " ",
OffsetComments: options.OffsetComments,
}
return FileWriter{
app: app,
options: options,
mainWriter: mainWriter,
newBankWriter: newBankWriter,
writer: writer.New(app, mainWriter, opts),
}
}
// Write writes the assembly file content including header, footer, code and data.
func (f FileWriter) Write() error {
var writes []any // nolint:prealloc
if !f.options.CodeOnly {
writes = []any{
customWrite(f.writer.WriteCommentHeader),
customWrite(f.writeROMHeader),
}
}
nextBank := addPrgBankSelectors(int(f.app.CodeBaseAddress), f.app.PRG)
for _, bank := range f.app.PRG {
writes = append(writes,
prgBankWrite{bank: bank},
)
}
writes = append(writes,
customWrite(f.writeVectors),
customWrite(f.writeCHR(nextBank)),
)
for _, write := range writes {
switch t := write.(type) {
case lineWrite:
if _, err := fmt.Fprintln(f.mainWriter, t); err != nil {
return fmt.Errorf("writing line: %w", err)
}
case customWrite:
if err := t(); err != nil {
return err
}
case prgBankWrite:
if err := f.writeConstants(t.bank); err != nil {
return err
}
if err := f.writeVariables(t.bank); err != nil {
return err
}
if err := f.writeCode(t.bank); err != nil {
return err
}
}
}
return nil
}
// writeROMHeader writes the ROM header configuration to the output.
func (f FileWriter) writeROMHeader() error {
if _, err := fmt.Fprintf(f.mainWriter, headerByte, "inesprg", f.app.PrgSize()/16384, " ", "Number of 16KB PRG-ROM banks"); err != nil {
return fmt.Errorf("writing header: %w", err)
}
if _, err := fmt.Fprintf(f.mainWriter, headerByte, "ineschr", len(f.app.CHR)/bankSize, " ", "Number of 8KB CHR-ROM banks"); err != nil {
return fmt.Errorf("writing header: %w", err)
}
if _, err := fmt.Fprintf(f.mainWriter, headerByte, "inesmap", f.app.Mapper, " ", "Mapper"); err != nil {
return fmt.Errorf("writing header: %w", err)
}
if _, err := fmt.Fprintf(f.mainWriter, headerByte, "inesmir", f.app.Mirror, " ", "Mirror mode"); err != nil {
return fmt.Errorf("writing header: %w", err)
}
return nil
}
// writeConstants writes constant aliases to the output.
func (f FileWriter) writeConstants(bank *program.PRGBank) error {
if err := f.writer.OutputAliasMap(bank.Constants); err != nil {
return fmt.Errorf("writing constants output alias map: %w", err)
}
return nil
}
// writeVariables writes variable aliases to the output.
func (f FileWriter) writeVariables(bank *program.PRGBank) error {
if err := f.writer.OutputAliasMap(bank.Variables); err != nil {
return fmt.Errorf("writing variables output alias map: %w", err)
}
return nil
}
// writeCHR writes the CHR content to the output.
func (f FileWriter) writeCHR(nextBank int) func() error {
return func() error {
if _, err := fmt.Fprint(f.mainWriter, "\n .DATA"); err != nil {
return fmt.Errorf("writing CHR bank: %w", err)
}
banks := chrBanks(nextBank, f.app.CHR)
for _, bank := range banks {
writeFunc := writeBankSelector(nextBank, -1)
if err := writeFunc(f.mainWriter); err != nil {
return fmt.Errorf("writing bank switch: %w", err)
}
if err := f.writer.BundleDataWrites(bank, nil); err != nil {
return fmt.Errorf("writing CHR data: %w", err)
}
nextBank++
}
return nil
}
}
// writeVectors writes the IRQ vectors.
func (f FileWriter) writeVectors() error {
if f.options.CodeOnly {
return nil
}
vectorStart := int(f.app.CodeBaseAddress) + f.app.PrgSize() - 6
if _, err := fmt.Fprintf(f.mainWriter, "\n .org $%04X\n", vectorStart); err != nil {
return fmt.Errorf("writing segment: %w", err)
}
if _, err := fmt.Fprintf(f.mainWriter, vectors, f.app.Handlers.NMI, f.app.Handlers.Reset, f.app.Handlers.IRQ); err != nil {
return fmt.Errorf("writing vectors: %w", err)
}
return nil
}
// writeCode writes the code to the output.
func (f FileWriter) writeCode(bank *program.PRGBank) error {
endIndex, err := bank.GetLastNonZeroByte(f.options)
if err != nil {
return fmt.Errorf("getting last non zero PRG byte: %w", err)
}
if err := f.writer.ProcessPRG(bank, endIndex); err != nil {
return fmt.Errorf("writing PRG: %w", err)
}
return nil
}