diff --git a/ir-parse.c b/ir-parse.c
index 8eb75db..5eaa1ac 100644
--- a/ir-parse.c
+++ b/ir-parse.c
@@ -5,36 +5,123 @@
  **/
 
 #include <stdio.h>
+#include <string.h>
 #include "json.h"
+#include "b64.h"
 #include "edk/Cper.h"
 #include "cper-parse.h"
 #include "cper-utils.h"
+#include "sections/cper-section-generic.h"
+#include "sections/cper-section-ia32x64.h"
+#include "sections/cper-section-arm.h"
+#include "sections/cper-section-memory.h"
+#include "sections/cper-section-pcie.h"
+#include "sections/cper-section-pci-bus.h"
+#include "sections/cper-section-pci-dev.h"
+#include "sections/cper-section-firmware.h"
+#include "sections/cper-section-dmar-generic.h"
+#include "sections/cper-section-dmar-vtd.h"
+#include "sections/cper-section-dmar-iommu.h"
+#include "sections/cper-section-ccix-per.h"
+#include "sections/cper-section-cxl-protocol.h"
+#include "sections/cper-section-ipf.h"
+#include "sections/cper-section-cxl-component.h"
 
 //Private pre-declarations.
 void ir_header_to_cper(json_object* header_ir, EFI_COMMON_ERROR_RECORD_HEADER* header);
+void ir_section_descriptor_to_cper(json_object* section_descriptor_ir, EFI_ERROR_SECTION_DESCRIPTOR* descriptor);
 
 //Converts the given JSON IR CPER representation into CPER binary format, piped to the provided file stream.
-//This function performs no validation of the IR against the CPER-JSON specification. For this, call
-//validate_schema() from json-schema.h before attempting to call this function. 
+//This function performs no validation of the IR against the CPER-JSON specification. To ensure a safe call,
+//use validate_schema() from json-schema.h before attempting to call this function. 
 void ir_to_cper(json_object* ir, FILE* out)
 {
     //Create the CPER header.
     EFI_COMMON_ERROR_RECORD_HEADER* header = (EFI_COMMON_ERROR_RECORD_HEADER*)calloc(1, sizeof(EFI_COMMON_ERROR_RECORD_HEADER));
     ir_header_to_cper(json_object_object_get(ir, "header"), header);
     fwrite(header, sizeof(EFI_COMMON_ERROR_RECORD_HEADER), 1, out);
-    
-    //...
-
-    //Free all resources.
     fflush(out);
+
+    //Create the CPER section descriptors.
+    json_object* section_descriptors = json_object_object_get(ir, "sectionDescriptors");
+    int amt_descriptors = json_object_array_length(section_descriptors);
+    EFI_ERROR_SECTION_DESCRIPTOR* descriptors[amt_descriptors];
+    for (int i=0; i<amt_descriptors; i++)
+    {
+        descriptors[i] = (EFI_ERROR_SECTION_DESCRIPTOR*)calloc(1, sizeof(EFI_ERROR_SECTION_DESCRIPTOR));
+        ir_section_descriptor_to_cper(json_object_array_get_idx(section_descriptors, i), descriptors[i]);
+        fwrite(descriptors[i], sizeof(EFI_ERROR_SECTION_DESCRIPTOR), 1, out);
+        fflush(out);
+    }
+    
+    //Run through each section in turn.
+    json_object* sections = json_object_object_get(ir, "sections");
+    int amt_sections = json_object_array_length(sections);
+    for (int i=0; i<amt_sections; i++)
+    {
+        //Get the section itself from the IR.
+        json_object* section = json_object_array_get_idx(sections, i);
+
+        //Find the correct section type, and parse.
+        if (guid_equal(&descriptors[i]->SectionType, &gEfiProcessorGenericErrorSectionGuid))
+            ir_section_generic_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiIa32X64ProcessorErrorSectionGuid))
+        //     ir_section_ia32x64_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiIpfProcessorErrorSectionGuid))
+        //     ir_section_ipf_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiArmProcessorErrorSectionGuid))
+        //     ir_section_arm_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiPlatformMemoryErrorSectionGuid))
+        //     ir_section_platform_memory_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiPlatformMemoryError2SectionGuid))
+        //     ir_section_platform_memory2_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiPcieErrorSectionGuid))
+        //     ir_section_pcie_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiFirmwareErrorSectionGuid))
+        //     ir_section_firmware_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiPciBusErrorSectionGuid))
+        //     ir_section_pci_bus_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiPciDevErrorSectionGuid))
+        //     ir_section_pci_dev_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiDMArGenericErrorSectionGuid))
+        //     ir_section_dmar_generic_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiDirectedIoDMArErrorSectionGuid))
+        //     ir_section_dmar_vtd_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiIommuDMArErrorSectionGuid))
+        //     ir_section_dmar_iommu_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiCcixPerLogErrorSectionGuid))
+        //     ir_section_ccix_per_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiCxlProtocolErrorSectionGuid))
+        //     ir_section_cxl_protocol_to_cper(section, out);
+        // else if (guid_equal(&descriptors[i]->SectionType, &gEfiCxlGeneralMediaErrorSectionGuid)
+        //     || guid_equal(&descriptors[i]->SectionType, &gEfiCxlDramEventErrorSectionGuid)
+        //     || guid_equal(&descriptors[i]->SectionType, &gEfiCxlPhysicalSwitchErrorSectionGuid)
+        //     || guid_equal(&descriptors[i]->SectionType, &gEfiCxlVirtualSwitchErrorSectionGuid)
+        //     || guid_equal(&descriptors[i]->SectionType, &gEfiCxlMldPortErrorSectionGuid))
+        // {
+        //     ir_section_cxl_component_to_cper(section, out);
+        // }
+        else
+        {
+            //Unknown GUID, so read as a base64 unknown section.
+            json_object* encoded = json_object_object_get(section, "data");
+            UINT8* decoded = b64_decode(json_object_get_string(encoded), json_object_get_string_len(encoded));
+            fwrite(decoded, descriptors[i]->SectionLength, 1, out);
+            fflush(out);
+            free(decoded);
+        }
+    }
+
+    //Free all remaining resources.
     free(header);
+    for (int i=0; i<amt_descriptors; i++)
+        free(descriptors[i]);
 }
 
 //Converts a CPER-JSON IR header to a CPER header structure.
 void ir_header_to_cper(json_object* header_ir, EFI_COMMON_ERROR_RECORD_HEADER* header)
 {
     header->SignatureStart = 0x52455043; //CPER
-    printf("beginning write.\n");
 
     //Revision.
     json_object* revision = json_object_object_get(header_ir, "revision");
@@ -60,7 +147,6 @@
     header->RecordLength = (UINT32)json_object_get_uint64(json_object_object_get(header_ir, "recordLength"));
 
     //Timestamp, if present.
-    printf("timestamp write.\n");
     json_object* timestamp = json_object_object_get(header_ir, "timestamp");
     if (timestamp != NULL) 
     {
@@ -69,7 +155,6 @@
     }
 
     //Various GUIDs.
-    printf("guid write.\n");
     json_object* platform_id = json_object_object_get(header_ir, "platformID");
     json_object* partition_id = json_object_object_get(header_ir, "partitionID");
     if (platform_id != NULL)
@@ -79,7 +164,6 @@
     string_to_guid(&header->CreatorID, json_object_get_string(json_object_object_get(header_ir, "creatorID")));
 
     //Notification type.
-    printf("notif type write.\n");
     json_object* notification_type = json_object_object_get(header_ir, "notificationType");
     string_to_guid(&header->NotificationType, json_object_get_string(json_object_object_get(notification_type, "guid")));
 
@@ -88,7 +172,44 @@
     header->PersistenceInfo = json_object_get_uint64(json_object_object_get(header_ir, "persistenceInfo"));
 
     //Flags.
-    printf("flag write.\n");
     json_object* flags = json_object_object_get(header_ir, "flags");
     header->Flags = (UINT32)json_object_get_uint64(json_object_object_get(flags, "value"));
+}
+
+//Converts a single CPER-JSON IR section descriptor into a CPER structure.
+void ir_section_descriptor_to_cper(json_object* section_descriptor_ir, EFI_ERROR_SECTION_DESCRIPTOR* descriptor)
+{
+    //Section offset, length.
+    descriptor->SectionOffset = (UINT32)json_object_get_uint64(json_object_object_get(section_descriptor_ir, "sectionOffset"));
+    descriptor->SectionLength = (UINT32)json_object_get_uint64(json_object_object_get(section_descriptor_ir, "sectionLength"));
+
+    //Revision.
+    json_object* revision = json_object_object_get(section_descriptor_ir, "revision");
+    int minor = json_object_get_int(json_object_object_get(revision, "minor"));
+    int major = json_object_get_int(json_object_object_get(revision, "major"));
+    descriptor->Revision = minor + (major << 8);
+
+    //Validation bits, flags.
+    descriptor->SecValidMask = ir_to_bitfield(json_object_object_get(section_descriptor_ir, "validationBits"), 
+        2, CPER_SECTION_DESCRIPTOR_VALID_BITFIELD_NAMES);
+    descriptor->SectionFlags = ir_to_bitfield(json_object_object_get(section_descriptor_ir, "flags"), 
+        8, CPER_SECTION_DESCRIPTOR_FLAGS_BITFIELD_NAMES);
+
+    //Section type.
+    json_object* section_type = json_object_object_get(section_descriptor_ir, "sectionType");
+    string_to_guid(&descriptor->SectionType, json_object_get_string(json_object_object_get(section_type, "data")));
+
+    //FRU ID, if present.
+    json_object* fru_id = json_object_object_get(section_descriptor_ir, "fruID");
+    if (fru_id != NULL)
+        string_to_guid(&descriptor->FruId, json_object_get_string(fru_id));
+
+    //Severity code.
+    json_object* severity = json_object_object_get(section_descriptor_ir, "severity");
+    descriptor->Severity = (UINT32)json_object_get_uint64(json_object_object_get(severity, "code"));
+
+    //FRU text, if present.
+    json_object* fru_text = json_object_object_get(section_descriptor_ir, "fruText");
+    if (fru_text != NULL)
+        strncpy(descriptor->FruString, json_object_get_string(fru_text), 20);
 }
\ No newline at end of file