static void qpeg_decode_intra(uint8_t *src, uint8_t *dst, int size, int stride, int width, int height) { int i; int code; int c0, c1; int run, copy; int filled = 0; height--; dst = dst + height * stride; while(size > 0) { code = *src++; size--; run = copy = 0; if(code == 0xFC) /* end-of-picture code */ break; if(code >= 0xF8) { /* very long run */ c0 = *src++; c1 = *src++; size -= 2; run = ((code & 0x7) << 16) + (c0 << 8) + c1 + 2; } else if (code >= 0xF0) { /* long run */ c0 = *src++; size--; run = ((code & 0xF) << 8) + c0 + 2; } else if (code >= 0xE0) { /* short run */ run = (code & 0x1F) + 2; } else if (code >= 0xC0) { /* very long copy */ c0 = *src++; c1 = *src++; size -= 2; copy = ((code & 0x3F) << 16) + (c0 << 8) + c1 + 1; } else if (code >= 0x80) { /* long copy */ c0 = *src++; size--; copy = ((code & 0x7F) << 8) + c0 + 1; } else { /* short copy */ copy = code + 1; } /* perform actual run or copy */ if(run) { int p; p = *src++; size--; for(i = 0; i < run; i++) { dst[filled++] = p; if (filled >= width) { filled = 0; dst -= stride; } } } else { for(i = 0; i < copy; i++) { dst[filled++] = *src++; if (filled >= width) { filled = 0; dst -= stride; } } size -= copy; } } }