mirror of https://github.com/AxioDL/metaforce.git
141 lines
3.8 KiB
C++
141 lines
3.8 KiB
C++
#include "Runtime/IOStreams.hpp"
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#include <hecl/hecl.hpp>
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namespace metaforce {
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#define DUMP_BITS 0
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#if DUMP_BITS
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static void PrintBinary(u32 val, u32 count) {
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for (u32 i = 0; i < count; ++i) {
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fmt::print(FMT_STRING("{}"), (val >> (count - i - 1)) & 0x1);
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}
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}
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#endif
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/*!
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* \brief CBitStreamReader::ReadBit
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* Reads and decodes an encoded value from a bitstream.
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* \param bitCount How many bits to read
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* \return s32 The encoded value
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*/
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s32 CBitStreamReader::ReadEncoded(u32 bitCount) {
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#if DUMP_BITS
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const auto pos = position();
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const auto boff = x20_bitOffset;
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#endif
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u32 ret = 0;
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const s32 shiftAmt = x20_bitOffset - s32(bitCount);
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if (shiftAmt < 0) {
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/* OR in remaining bits of cached value */
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u32 mask = bitCount == 32 ? UINT32_MAX : ((1U << bitCount) - 1);
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ret |= (x1c_val << u32(-shiftAmt)) & mask;
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/* Load in exact number of bytes remaining */
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auto loadDiv = std::div(-shiftAmt, 8);
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if (loadDiv.rem)
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++loadDiv.quot;
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readUBytesToBuf(reinterpret_cast<u8*>(&x1c_val) + 4 - loadDiv.quot, loadDiv.quot);
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x1c_val = hecl::SBig(x1c_val);
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/* New bit offset */
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x20_bitOffset = loadDiv.quot * 8 + shiftAmt;
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/* OR in next bits */
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mask = (1U << u32(-shiftAmt)) - 1;
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ret |= (x1c_val >> x20_bitOffset) & mask;
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} else {
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/* OR in bits of cached value */
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const u32 mask = bitCount == 32 ? UINT32_MAX : ((1U << bitCount) - 1);
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ret |= (x1c_val >> u32(shiftAmt)) & mask;
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/* New bit offset */
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x20_bitOffset -= bitCount;
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}
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#if DUMP_BITS
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std::fputs("READ ", stdout);
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PrintBinary(ret, bitCount);
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fmt::print(FMT_STRING(" {} {}\n"), pos, boff);
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#endif
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return ret;
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}
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void CBitStreamWriter::WriteEncoded(u32 val, u32 bitCount) {
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#if DUMP_BITS
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std::fputs("WRITE ", stdout);
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PrintBinary(val, bitCount);
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fmt::print(FMT_STRING(" {} {}\n"), position(), x18_bitOffset);
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#endif
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const s32 shiftAmt = x18_bitOffset - s32(bitCount);
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if (shiftAmt < 0) {
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/* OR remaining bits to cached value */
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const u32 mask = (1U << x18_bitOffset) - 1;
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x14_val |= (val >> u32(-shiftAmt)) & mask;
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/* Write out 32-bits */
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x14_val = hecl::SBig(x14_val);
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writeBytes(&x14_val, sizeof(x14_val));
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/* Cache remaining bits */
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x18_bitOffset = 0x20 + shiftAmt;
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x14_val = val << x18_bitOffset;
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} else {
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/* OR bits to cached value */
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const u32 mask = bitCount == 32 ? UINT32_MAX : ((1U << bitCount) - 1);
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x14_val |= (val & mask) << u32(shiftAmt);
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/* New bit offset */
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x18_bitOffset -= bitCount;
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}
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}
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void CBitStreamWriter::Flush() {
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if (x18_bitOffset >= 0x20) {
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return;
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}
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auto pos = std::div(0x20 - s32(x18_bitOffset), 8);
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if (pos.rem != 0) {
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++pos.quot;
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}
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x14_val = hecl::SBig(x14_val);
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writeBytes(&x14_val, pos.quot);
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x18_bitOffset = 0x20;
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x14_val = 0;
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}
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CZipInputStream::CZipInputStream(std::unique_ptr<CInputStream>&& strm)
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: x24_compBuf(new u8[4096]), x28_strm(std::move(strm)) {
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x30_zstrm.next_in = x24_compBuf.get();
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x30_zstrm.avail_in = 0;
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x30_zstrm.zalloc = [](void*, u32 c, u32 n) -> void* { return new u8[size_t{c} * size_t{n}]; };
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x30_zstrm.zfree = [](void*, void* buf) { delete[] static_cast<u8*>(buf); };
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inflateInit(&x30_zstrm);
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}
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CZipInputStream::~CZipInputStream() { inflateEnd(&x30_zstrm); }
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atUint64 CZipInputStream::readUBytesToBuf(void* buf, atUint64 len) {
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x30_zstrm.next_out = static_cast<Bytef*>(buf);
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x30_zstrm.avail_out = len;
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x30_zstrm.total_out = 0;
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while (x30_zstrm.avail_out != 0) {
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if (x30_zstrm.avail_in == 0) {
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atUint64 readSz = x28_strm->readUBytesToBuf(x24_compBuf.get(), 4096);
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x30_zstrm.avail_in = readSz;
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x30_zstrm.next_in = x24_compBuf.get();
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}
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int inflateRet = inflate(&x30_zstrm, Z_NO_FLUSH);
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if (inflateRet != Z_OK)
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break;
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}
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return x30_zstrm.total_out;
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}
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} // namespace metaforce
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