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Added a safety seek.

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This commit is contained in:
Thomas Harte 2017-07-17 07:35:53 -04:00
parent fa617eac6b
commit 9108495586
1 changed files with 4 additions and 0 deletions
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4
Storage/Tape/Formats/TZX.cpp
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@ -67,6 +67,7 @@ void TZX::get_next_pulses() {
void TZX::get_generalised_data_block() { void TZX::get_generalised_data_block() {
uint32_t block_length = fgetc32le(); uint32_t block_length = fgetc32le();
long endpoint = ftell(file_) + (long)block_length;
uint16_t pause_after_block = fgetc16le(); uint16_t pause_after_block = fgetc16le();
uint32_t total_pilot_symbols = fgetc32le(); uint32_t total_pilot_symbols = fgetc32le();
@ -80,6 +81,9 @@ void TZX::get_generalised_data_block() {
get_generalised_segment(total_pilot_symbols, maximum_pulses_per_pilot_symbol, symbols_in_pilot_table, false); get_generalised_segment(total_pilot_symbols, maximum_pulses_per_pilot_symbol, symbols_in_pilot_table, false);
get_generalised_segment(total_data_symbols, maximum_pulses_per_data_symbol, symbols_in_data_table, true); get_generalised_segment(total_data_symbols, maximum_pulses_per_data_symbol, symbols_in_data_table, true);
emplace_back(Tape::Pulse::Zero, Storage::Time((unsigned int)pause_after_block, 1000u)); emplace_back(Tape::Pulse::Zero, Storage::Time((unsigned int)pause_after_block, 1000u));
// This should be unnecessary, but intends to preserve sanity.
fseek(file_, endpoint, SEEK_SET);
} }
void TZX::get_generalised_segment(uint32_t output_symbols, uint8_t max_pulses_per_symbol, uint8_t number_of_symbols, bool is_data) { void TZX::get_generalised_segment(uint32_t output_symbols, uint8_t max_pulses_per_symbol, uint8_t number_of_symbols, bool is_data) {