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#ifndef BUFFER_H
#define BUFFER_H
#include <string.h>
#include <stdint.h>
class Buffer {
private:
char *m_data;
bool m_freeBuffer;
int m_size;
int m_capacity;
int m_readPointer;
char m_preAllocBuffer[0x200];
public:
Buffer() {
m_data = m_preAllocBuffer;
m_freeBuffer = false;
m_size = 0;
m_capacity = sizeof(m_preAllocBuffer);
m_readPointer = 0;
}
~Buffer() {
if ((m_data != NULL) && m_freeBuffer) {
delete[] m_data;
m_data = NULL;
}
}
void useExistingBuffer(char *data, int size) {
if (m_freeBuffer)
delete[] m_data;
m_data = data;
m_freeBuffer = false;
m_size = size;
m_capacity = size;
m_readPointer = 0;
}
char *data() const { return m_data; }
int size() const { return m_size; }
int capacity() const { return m_capacity; }
void setCapacity(int capacity) {
if (capacity == m_capacity)
return;
// Trim the size down if it's too big to fit
if (m_size > capacity)
m_size = capacity;
char *newBuf = new char[capacity];
if (m_data != NULL) {
memcpy(newBuf, m_data, m_size);
if (m_freeBuffer)
delete[] m_data;
}
m_data = newBuf;
m_capacity = capacity;
m_freeBuffer = true;
}
void clear() {
m_size = 0;
}
void append(const char *data, int size) {
if (size <= 0)
return;
int requiredSize = m_size + size;
if (requiredSize > m_capacity)
setCapacity(requiredSize + 0x100);
memcpy(&m_data[m_size], data, size);
m_size += size;
}
void append(const Buffer &buf) {
append(buf.data(), buf.size());
}
void resize(int size) {
if (size > m_capacity)
setCapacity(size + 0x100);
m_size = size;
}
void trimFromStart(int amount) {
if (amount <= 0)
return;
if (amount >= m_size) {
clear();
return;
}
memmove(m_data, &m_data[amount], m_size - amount);
m_size -= amount;
}
void writeU32(uint32_t v) { append((const char *)&v, 4); }
void writeU16(uint16_t v) { append((const char *)&v, 2); }
void writeU8(uint8_t v) { append((const char *)&v, 1); }
void writeS32(int32_t v) { append((const char *)&v, 4); }
void writeS16(int16_t v) { append((const char *)&v, 2); }
void writeS8(int8_t v) { append((const char *)&v, 1); }
void writeStr(const char *data, int size = -1) {
if (size == -1)
size = strlen(data);
writeU32(size);
append(data, size);
}
void readSeek(int pos) {
m_readPointer = pos;
}
int readTell() const {
return m_readPointer;
}
bool readRemains(int size) const {
if ((size > 0) && ((m_readPointer + size) <= m_size))
return true;
return false;
}
void read(char *output, int size) {
if ((m_readPointer + size) > m_size) {
// Not enough space to read the whole thing...!
int copy = m_size - m_readPointer;
if (copy > 0)
memcpy(output, &m_data[m_readPointer], copy);
memset(&output[copy], 0, size - copy);
m_readPointer = m_size;
} else {
memcpy(output, &m_data[m_readPointer], size);
m_readPointer += size;
}
}
uint32_t readU32() { uint32_t v; read((char *)&v, 4); return v; }
uint16_t readU16() { uint16_t v; read((char *)&v, 2); return v; }
uint8_t readU8() { uint8_t v; read((char *)&v, 1); return v; }
int32_t readS32() { int32_t v; read((char *)&v, 4); return v; }
int16_t readS16() { int16_t v; read((char *)&v, 2); return v; }
int8_t readS8() { int8_t v; read((char *)&v, 1); return v; }
void readStr(char *output, int bufferSize) {
uint32_t size = readU32();
if (!readRemains(size)) {
strcpy(output, "");
return;
}
// How much can we safely get?
int readAmount;
if (size < (bufferSize - 1))
readAmount = size;
else
readAmount = bufferSize - 1;
// Put this into the buffer
read(output, readAmount);
output[readAmount] = 0;
// In case the buffer was too small, skip over the extra source data
m_readPointer += (size - readAmount);
}
void dump() {
for (int base = 0; base < m_size; base += 0x10) {
printf("%08x | ", base);
int pos;
for (pos = base; (pos < m_size) && (pos < (base + 0x10)); pos++)
printf("%02x ", (uint8_t)m_data[pos]);
if (pos < (base + 0x10))
for (; pos < (base + 0x10); pos++)
printf(" ");
printf("| ");
for (pos = base; (pos < m_size) && (pos < (base + 0x10)); pos++)
if (m_data[pos] >= 32)
printf("%c", m_data[pos]);
else
printf(".");
printf("\n");
}
}
};
#endif /* BUFFER_H */
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