Match HuDecodeSlide and HuDecodeFSlide

src/game/decode.c

@@ -0,0 +1,213 @@
+#include "common.h"
+
+struct decode_data
+{
+    u8 *src;
+    u8 *dst;
+    u32 size;
+};
+
+static u8 TextBuffer[1024];
+
+static void HuDecodeNone(struct decode_data *decode)
+{
+    while(decode->size) {
+        *decode->dst++ = *decode->src++;
+        decode->size--;
+    }
+}
+
+static void HuDecodeLz(struct decode_data *decode)
+{
+    u16 flag;
+    u16 pos;
+    int i, j;
+    flag = 0;
+    pos = 958;
+    
+    for(i=0; i<1024; i++) {
+        TextBuffer[i] = 0;
+    }
+    while(decode->size) {
+        flag >>= 1;
+        if(!(flag & 0x100)) {
+            flag = (*decode->src++)|0xFF00;
+        }
+        if(flag & 0x1) {
+            TextBuffer[pos++] = *decode->dst++ = *decode->src++;
+            pos = pos & 0x3FF;
+            decode->size--;
+        } else {
+            u16 copy_pos, copy_size;
+            copy_pos = *decode->src++;
+            copy_size = *decode->src++;
+            copy_pos |= ((copy_size & 0xC0) << 2);
+            copy_size = (copy_size & 0x3F)+3;
+            for(j=0; j<copy_size; j++) {
+                TextBuffer[pos++] = *decode->dst++ = TextBuffer[(copy_pos+j) & 0x3FF];
+                pos &= 0x3FF;
+            }
+            decode->size -= j;
+        }
+    }
+}
+
+static inline void SlideReadHeader(struct decode_data *decode)
+{
+    int size;
+    size = (*decode->src++) << 24;
+    size += (*decode->src++) << 16;
+    size += (*decode->src++) << 8;
+    size += *decode->src++;
+}
+
+static void HuDecodeSlide(struct decode_data *decode)
+{
+    u8 *base_dst;
+    u32 num_bits, flag;
+    SlideReadHeader(decode);
+    num_bits = 0;
+    flag = 0;
+    base_dst = decode->dst;
+    while(decode->size) {
+        if(num_bits == 0) {
+            flag = (*decode->src++) << 24;
+            flag += (*decode->src++) << 16;
+            flag += (*decode->src++) << 8;
+            flag += *decode->src++;
+            num_bits = 32;
+        }
+        if(flag >> 31) {
+            *decode->dst++ = (int)*decode->src++;
+            decode->size--;
+        } else {
+            u8 *src;
+            u32 dist, len;
+            dist = *decode->src++ << 8;
+            dist += *decode->src++;
+            len = (dist >> 12) & 0xF;
+            dist &= 0xFFF;
+            src = decode->dst-dist;
+            if(len == 0) {
+                len = (*decode->src++)+18;
+            } else {
+                len += 2;
+            }
+            decode->size -= len;
+            while(len) {
+                if(src-1 < base_dst) {
+                    *decode->dst++ = 0;
+                } else {
+                    *decode->dst++ = src[-1];
+                }
+                len--;
+                src++;
+            }
+        }
+        
+        flag <<= 1;
+        num_bits--;
+    }
+}
+
+static void HuDecodeFslide(struct decode_data *decode)
+{
+    u32 num_bits, flag;
+    SlideReadHeader(decode);
+    num_bits = 0;
+    flag = 0;
+    while(decode->size) {
+        if(num_bits == 0) {
+            flag = (*decode->src++) << 24;
+            flag += (*decode->src++) << 16;
+            flag += (*decode->src++) << 8;
+            flag += *decode->src++;
+            num_bits = 32;
+        }
+        if(flag >> 31) {
+            *decode->dst++ = (int)*decode->src++;
+            decode->size--;
+        } else {
+            u8 *src;
+            u32 dist, len;
+            dist = *decode->src++ << 8;
+            dist += *decode->src++;
+            len = (dist >> 12) & 0xF;
+            dist &= 0xFFF;
+            src = decode->dst-dist;
+            if(len == 0) {
+                len = (*decode->src++)+18;
+            } else {
+                len += 2;
+            }
+            decode->size -= len;
+            while(len) {
+                *decode->dst++ = src[-1];
+                len--;
+                src++;
+            }
+        }
+        
+        flag <<= 1;
+        num_bits--;
+    }
+}
+
+static void HuDecodeRle(struct decode_data *decode)
+{
+    int i;
+    while(decode->size) {
+        int size = *decode->src++;
+        if(size < 128) {
+            int fill = *decode->src++;
+            for(i=0; i<size; i++) {
+                *decode->dst++ = fill;
+            }
+        } else {
+            size -= 128;
+            for(i=0; i<size; i++) {
+                *decode->dst++ = *decode->src++;
+            }
+        }
+        decode->size -= size;
+    }
+}
+
+void HuDecodeData(void *src, void *dst, int decode_type, u32 size)
+{
+    struct decode_data decode;
+    struct decode_data *decode_ptr = &decode;
+    decode_ptr->src = src;
+    decode_ptr->dst = dst;
+    decode_ptr->size = size;
+    switch(decode_type) {
+        case 0:
+            HuDecodeNone(decode_ptr);
+            break;
+            
+        case 1:
+            HuDecodeLz(decode_ptr);
+            break;
+            
+        case 2:
+            HuDecodeSlide(decode_ptr);
+            break;
+            
+        case 3:
+            HuDecodeFslide(decode_ptr);
+            break;
+            
+        case 4:
+            HuDecodeFslide(decode_ptr);
+            break;
+            
+        case 5:
+            HuDecodeRle(decode_ptr);
+            break;
+            
+        default:
+            OSReport("decode tyep unknown.(%x)\n", decode_type);
+            break;
+    }
+    DCFlushRange(dst, size);
+}