--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sidlib.c	Fri Jan 01 03:32:42 2016 +0200
@@ -0,0 +1,186 @@
+/*
+ * SIDInfoLib - Way too simplistic PSID/RSID file library
+ * Written by Matti 'ccr' Hämäläinen <ccr@tnsp.org>
+ * (C) Copyright 2014-2015 Tecnic Software productions (TNSP)
+ */
+#include "sidlib.h"
+#include "th_endian.h"
+
+
+static void siAppendHash16(th_md5state_t *state, uint16_t data)
+{
+    uint8_t ib8[2];
+    ib8[0] = data & 0xff;
+    ib8[1] = data >> 8;
+    th_md5_append(state, (uint8_t *) &ib8, sizeof(ib8));
+}
+
+
+int siReadPSIDFile(FILE *inFile, PSIDHeader *psid)
+{
+    th_md5state_t state;
+    uint8_t tmp8, *fileData = NULL;
+    int index, ret = -1;
+    size_t read;
+    BOOL first;
+
+    memset(psid, 0, sizeof(*psid));
+
+    if ((fileData = (uint8_t *) th_malloc(PSID_BUFFER_SIZE)) == NULL)
+    {
+        THERR("Error allocating temporary data buffer of %d bytes.\n", PSID_BUFFER_SIZE);
+        goto error;
+    }
+
+    // Read PSID header in
+    if (!th_fread_str(inFile, (uint8_t *) psid->magic, PSID_MAGIC_LEN) ||
+        !th_fread_be16(inFile, &psid->version) ||
+        !th_fread_be16(inFile, &psid->dataOffset) ||
+        !th_fread_be16(inFile, &psid->loadAddress) ||
+        !th_fread_be16(inFile, &psid->initAddress) ||
+        !th_fread_be16(inFile, &psid->playAddress) ||
+        !th_fread_be16(inFile, &psid->nSongs) ||
+        !th_fread_be16(inFile, &psid->startSong) ||
+        !th_fread_be32(inFile, &psid->speed))
+    {
+        THERR("Could not read PSID/RSID header.\n");
+        goto error;
+    }
+
+    psid->magic[PSID_MAGIC_LEN] = 0;
+
+    if ((psid->magic[0] != 'R' && psid->magic[0] != 'P') ||
+        psid->magic[1] != 'S' || psid->magic[2] != 'I' || psid->magic[3] != 'D' ||
+        psid->version < 1 || psid->version > 3)
+    {
+        THERR("Not a supported PSID or RSID file.\n");
+        goto error;
+    }
+
+    psid->isRSID = psid->magic[0] == 'R';
+
+    if (!th_fread_str(inFile, (uint8_t *)psid->sidName, PSID_STR_LEN) ||
+        !th_fread_str(inFile, (uint8_t *)psid->sidAuthor, PSID_STR_LEN) ||
+        !th_fread_str(inFile, (uint8_t *)psid->sidCopyright, PSID_STR_LEN))
+    {
+        THERR("Error reading SID file header.\n");
+        goto error;
+    }
+
+    psid->sidName[PSID_STR_LEN] = 0;
+    psid->sidAuthor[PSID_STR_LEN] = 0;
+    psid->sidCopyright[PSID_STR_LEN] = 0;
+
+    // Check if we need to load PSIDv2NG header ...
+    if (psid->version >= 2)
+    {
+        // Yes, we need to
+        if (!th_fread_be16(inFile, &psid->flags) ||
+            !th_fread_byte(inFile, &psid->startPage) ||
+            !th_fread_byte(inFile, &psid->pageLength) ||
+            !th_fread_be16(inFile, &psid->reserved))
+        {
+            THERR("Error reading PSID/RSID v2+ extra header data.\n");
+            goto error;
+        }
+    }
+
+    // Initialize MD5-hash calculation
+    th_md5_init(&state);
+
+    // Process actual data
+    psid->dataSize = 0;
+    first = TRUE;
+    do
+    {
+        read = fread(fileData, sizeof(uint8_t), PSID_BUFFER_SIZE, inFile);
+        psid->dataSize += read;
+
+        if (first && psid->loadAddress == 0)
+        {
+            if (read < 4)
+            {
+                THERR("Error reading song data, unexpectedly small file.\n");
+                goto error;
+            }
+
+            // Grab the actual load address
+            psid->loadAddress = TH_LE16_TO_NATIVE(*(uint16_t *) fileData);
+
+            // Strip load address (2 first bytes)
+            th_md5_append(&state, &fileData[2], read - 2);
+            first = FALSE;
+        }
+        else
+        if (read > 0)
+        {
+            // Append "as is"
+            th_md5_append(&state, fileData, read);
+        }
+    } while (read > 0 && !feof(inFile));
+
+    // Append header data to hash
+    siAppendHash16(&state, psid->initAddress);
+    siAppendHash16(&state, psid->playAddress);
+    siAppendHash16(&state, psid->nSongs);
+
+    // Append song speed data to hash
+    tmp8 = psid->isRSID ? 60 : 0;
+    for (index = 0; index < psid->nSongs && index < 32; index++)
+    {
+        if (psid->isRSID)
+            tmp8 = 60;
+        else
+            tmp8 = (psid->speed & (1 << index)) ? 60 : 0;
+
+        th_md5_append(&state, &tmp8, sizeof(tmp8));
+    }
+
+    // Rest of songs (more than 32)
+    for (index = 32; index < psid->nSongs; index++)
+        th_md5_append(&state, &tmp8, sizeof(tmp8));
+
+    // PSIDv2NG specific
+    if (psid->version >= 2)
+    {
+        // REFER TO SIDPLAY HEADERS FOR MORE INFORMATION
+        tmp8 = (psid->flags >> 2) & 3;
+        if (tmp8 == 2)
+            th_md5_append(&state, &tmp8, sizeof(tmp8));
+    }
+
+    // Calculate the hash
+    th_md5_finish(&state, psid->hash);
+    ret = 0;
+
+error:
+    // Free buffer
+    th_free(fileData);
+    return ret;
+}
+
+
+const char *siGetSIDClockStr(const int flags)
+{
+    switch (flags & PSF_CLOCK_MASK)
+    {
+        case PSF_CLOCK_UNKNOWN : return "Unknown";
+        case PSF_CLOCK_PAL     : return "PAL 50Hz";
+        case PSF_CLOCK_NTSC    : return "NTSC 60Hz";
+        case PSF_CLOCK_ANY     : return "PAL / NTSC";
+        default                : return "?";
+    }
+}
+
+
+const char *siGetSIDModelStr(const int flags)
+{
+    switch (flags & PSF_MODEL_MASK)
+    {
+        case PSF_MODEL_UNKNOWN : return "Unknown";
+        case PSF_MODEL_MOS6581 : return "MOS6581";
+        case PSF_MODEL_MOS8580 : return "MOS8580";
+        case PSF_MODEL_ANY     : return "MOS6581 / MOS8580";
+        default                : return "?";
+    }
+}